Reversible variable drives and systems and methods for control in forward and reverse directions

Description

BACKGROUND

To assist with the description of embodiments, the following description of the relationship between tilt and skew is provided, in which FIGS. 1A-1C depict coordinate systems in reference to embodiments of certain components of a ball-planetary continuously variable transmission (CVT).

As depicted in FIGS. 1A-1G, CVT 100 includes planets 108 in contact with sun 110 and traction rings 102, 104. Planets 108 are interposed between and in contact with first traction ring 102 and second traction ring 104 at, respectively, first angular position 112 and second angular position 114. FIG. 1A depicts global coordinate system 150 (defined herein to include axes x_g, y_g, z_g) and planet-centered coordinate system 160 (defined herein to include axes x, y, z). Global coordinate system 150 is oriented with respect to longitudinal axis 15 of CVT 100, with the z_g-axis coinciding with longitudinal axis 15 about which planets 108 are arranged. Planet-centered coordinate system 160 has its origin at the geometric center of each planet 108, with the y-axis perpendicular to longitudinal axis 15, and the z-axis parallel to longitudinal axis 15. Each of planets 108 has axle 103 defining a planet axis of rotation (defined herein as planet axis 106). Planet axis 106 may be angularly oriented in the y-z plane relative to the x-axis at tilt angle (gamma) 118. Tilt angle (gamma) 118 determines the kinematic ratio between the rotational speeds of traction rings 102 and 104. Each planet 108 has a rotational velocity ω (omega) about planet axis 106, depicted in FIG. 1A as planet rotational velocity 122. Planet axis 106 is defined by planet axle 103. In planet-centered coordinate system 160, the x-axis is directed into the plane of the page (though not shown precisely as such in FIG. 1A), and the z-axis is parallel to longitudinal axis 15. For purposes of illustration, tilt angle (gamma) 118 is generally defined in the y-z plane.

As depicted in FIGS. 1B and 1C, planet-centered coordinate system 160 is resolved further to illustrate the angular adjustments of each planet axis 106 used in embodiments of skew control systems. As depicted in FIG. 1B, tilt angle (gamma) 118 can be derived by rotating coordinate system 160 (with planet axis 106 in the y-z plane) about the x-axis to achieve first relative coordinate system 170 (x′, y′, z′). In relative coordinate system 170, planet axis 106 coincides with the z′-axis. As depicted in FIG. 1C, skew angle (zeta) 120 can be derived by rotating coordinate system 170 about the y-axis (not the y′-axis) to achieve second relative coordinate system 180 (x″, y″, z″). In relative coordinate system 180, planet axis 106 coincides with the z″-axis. Skew angle (zeta) 120 is the angular orientation relative to the y-axis in the x-z plane of the planet axis 106. In some embodiments, tilt angle (gamma) 118 is controlled, at least in part, through an adjustment of skew angle (zeta) 120.

As depicted in FIG. 1D, certain kinematic relationships between contacting components of CVT 100 explain how the inducement of a skew condition generates forces that tend to adjust tilt angle (gamma) 118. As used herein, the phrase “skew condition” refers to an orientation of planet axes 106 such that a non-zero skew angle (zeta) 120 relative to the y-axis exists. Hence, reference to “inducement of a skew condition” implies an inducement of planet axes 106 to align at non-zero skew angle (zeta) 120. In certain embodiments of CVT 100, certain spin-induced forces also act on planet 108. In CVT 100, traction rings 102, 104 and sun 110 contact planet 108 at three locations to form traction or friction contact areas. In certain embodiments, first traction ring 102 drives planet 108 at contact 1, and planet 108 transmits power to second traction ring 104 at contact 2. Traction sun 110 contacts traction planet 108 at contact 3, which may be a single point (shown) or may collectively refer to multiple contact points (not shown here for simplicity). Contact points 1, 2 and 3 are arranged in FIG. 1D to reflect a view of the x-z plane as seen from above CVT 100. However, for ease of understanding, since contact areas 1, 2 and 3 are not coplanar, contact-centered coordinate systems are used in FIG. 1D so that contact areas 1, 2 and 3 can be illustrated with the x-z plane. Subscripts 1, 2, and 3 are used to denote the specific contact area for contact-centered coordinate systems. The z₁, z₂, and z₃axes intersect at the center of a spherical traction planet 108.

As depicted in FIG. 1D, the surface velocity of first traction ring 102 is denoted in the negative x₁direction by vector V_r1and the surface velocity of planet 108 is represented by a vector V_p1; the angle formed between the vectors V_r1and V_p1is approximately skew angle 120. The resulting relative surface velocity between first traction ring 102 and traction planet 108 is represented by a vector V_r1/p. At contact area 3 between traction planet 108 and traction sun 110, the surface velocity of traction sun 110 is represented by vector V_svand the surface velocity of traction planet 108 is represented by vector V_ps; the angle formed between V_svand V_psis approximately skew angle 120. The relative surface velocity between traction planet 108 and traction sun 110 is represented by vector V_sv/p. Similarly, for contact 2, the surface velocity of traction planet 108 at contact area 2 is represented by vector V_p2and the surface velocity of second traction ring 104 is represented by vector V_r2; the angle formed between V_p2and V_r2is approximately skew angle 120; the relative surface velocity between traction planet 108 and second traction ring 104 is represented by vector V_r2/p.

The kinematic relationships discussed above tend to generate forces at the contacting components. FIG. 1E depicts a generalized, representative traction curve that can be applied at each of contact areas 1, 2, 3, illustrating a relationship between the traction coefficient μ and the relative velocity between contacting components. The traction coefficient μ is indicative of the capacity of the fluid to transmit a force. The relative velocity, such as V_r1/p, can be a function of skew angle 120. The traction coefficient μ is the vector sum of the traction coefficient in the x-direction (μ_x) and the traction coefficient in the y-direction (μ_y) at contact area 1, 2, or 3. As a general matter, traction coefficient μ is a function of the traction fluid properties, the normal force at the contact area, and the velocity of the traction fluid in the contact area, among many other things. For a given traction fluid, the traction coefficient μ increases with increasing relative velocities of components, until the traction coefficient μ reaches a maximum capacity after which the traction coefficient μ decreases with increasing relative velocities of components. Consequently, in the presence of skew angle 120 (i.e., under a non-zero skew condition), forces are generated at contact areas 1, 2, 3 around the traction planet 108 due to kinematic conditions.

Based on the traction curve depicted in FIG. 1E and the diagrams depicted in FIGS. 1D and 1F, V_r1/pgenerates a traction force parallel to V_r1/pwith a component side force F_s1. Increasing skew angle 120 increases V_r1/pand, thereby increases force F_s1(according to the general relationship illustrated in FIG. 1D). V_sv/pgenerates force F_ss, and similarly, V_r2/pgenerates force F_s2. Forces F_s1, F_ss, and F_s2combine to create a net moment about traction planet 108 in the y-z plane. More specifically, the summation of moments about traction planet 108 is M=R*(F_s1+F_s2+F_ss), where R is the radius of traction planet 108, and forces F_s1, F_s2, and F_ssare the resultant components of the contact forces in the y-z plane. The contact forces, also referred to here as skew-induced forces, in the above equation are as follows: F_s1=μ_y11N1, and F_s2=μ_y2N2 and F_ss=μ_ysN3, where N1, N2 and N3 are the normal forces at the respective contact areas 1, 2 and 3. Since the traction coefficient μ is a function of relative velocity between contacting components, the traction coefficients μ_y1, μ_y2, and μ_ysare consequently a function of skew angle 120 as related by the kinematic relationship. In the embodiment illustrated here, a moment is an acceleration of inertia and the moment will generate a tilt angle acceleration {umlaut over (γ)}. Therefore, the rate of change of tilt angle {dot over (γ)}, is a function of skew angle 120.

FIG. 1G depicts a top view of one embodiment of traction planet 108 having non-zero skew angle (zeta) 120, which results in planet axis of rotation 106 being non-parallel (in the y_g-z_gplane) to longitudinal axis 15 of CVT 100 and rotational velocity 122 of traction planet 108 is not coaxial with the z-axis. Skew angle 120 generates forces for motivating a change in tilt angle 118. In the presence of skew angle 120, traction planet 108 would have rotational velocity 122 about an axis z″, and tilt angle 118 would be formed between axis z″ and the y-z plane.

SUMMARY OF CERTAIN INVENTIVE ASPECTS

Embodiments of CVTs disclosed herein are capable of operating according to the above-mentioned principles during operation in forward direction and reverse direction, may switch between operation in forward direction and reverse direction, and may be controlled using various control schemes that enable switching between operation in forward direction and reverse direction. In particular, embodiments disclosed herein include a vehicle or equipment with a transmission, drivetrain, CVT or a control system for a CVT having a control system coupled to a plurality of trunnions coupled to each axle in a plurality of axles, wherein the control system is capable of misaligning the axles to adjust a speed ratio over a range of speed ratios between underdrive and overdrive (and including 1:1), and configurable to operate in forward and reverse directions and further configurable to operate according to different control strategies for stability and sensitivity.

Advantageously, embodiments disclosed herein may operate in either forward direction or reverse direction, allowing a CVT to be continuously adjusted to maintain a constant output speed for varying input speeds and torques, to maintain a speed ratio for variable input speeds and torques or variable output speeds and torques, or to provide variable output speeds for constant input speeds and torques. Furthermore, when radial translation of trunnion extensions results in trunnions oriented with an offset angle (psi) that reverses signs (that is, switching from positive to negative or negative to positive), embodiments may proactively, simultaneously or reactively adjust a speed ratio of a CVT. As such, if a CVT is operating in overdrive in forward and trunnion extensions are radially translated to reorient the trunnions to reverse the sign of offset angle (psi), the CVT may also be adjusted from overdrive to underdrive. Furthermore, control of a CVT between operation in forward direction and reverse direction may include radially translating trunnion extensions to change the orientation of trunnions relative to a pitch circle to accommodate a switch in the direction of rotation and compensating for the corresponding switch between overdrive and underdrive by axially translating trunnion extensions to apply a skew condition to maintain the skew angle (zeta) imparted on the planets. The processes of orienting the trunnions to an offset angle (psi) relative to the pitch circle to configure the CVT for switching between operation in forward direction and reverse direction and applying a skew angle (zeta) to adjust a tilt angle (gamma) of the CVT adjust the speed ratio of the CVT to any speed ratio between underdrive and overdrive may be performed independently, allowing for multiple possible control schemes for a CVT, such as an example CVT 200 described below.

To configure a CVT for operation in a forward direction or a reverse direction, embodiments may translate trunnion extensions radially inward or outward of a pitch circle to orient trunnions to have a positive or negative offset angle (psi). Furthermore, embodiments disclosed herein may adjust tilt angles (gamma), angular positioning (beta), skew angles (zeta) and offset angles (psi) independently or concurrently, allowing a control system to switch operation of CVT between forward and reverse rotation, and adjust or maintain a speed ratio.

Couplings between trunnions and trunnion extensions allow trunnion extensions to move axially but allow trunnions to rotate to a target offset angle (psi) about their respective z-axes.

Embodiments disclosed herein may advantageously orient trunnions at an offset angle (psi) and adjust a tilt angle (gamma) of axles for a CVT concurrently or independently, allowing for controlled operations in both forward and reverse directions, wherein an offset angle (psi) sign can change at any ratio range, and a transmission ratio (speed or torque) may be adjusted at any offset angle (psi). Advantageously, if a control system for a vehicle operating a CVT determines that a rollback scenario is occurring or likely to occur, a control system may initiate radial movement of couplings or trunnion extensions or change an orientation of trunnions to change the offset angle (psi) sign relative to the pitch circle. Instead of disconnecting power to avoid rollback damage or locking the CVT at a set angle to mitigate rollback damage, changing the offset angle (psi) independently or concurrently with changing the tilt angle (gamma) allows the control system (and therefore the operator) to maintain positive control of the CVT even in rollback scenarios.

Embodiments of a control system may also determine a control sensitivity. The control sensitivity is a function of the offset angle (psi) and dimensions of components including links. Small offset angles (psi) or short link lengths require less axial movement to achieve the same tilt angle (gamma) and allow for faster ratio adjustments but may be less stable. Larger offset angles (psi) or longer link lengths require more axial movement to achieve the same tilt angle (gamma) and may limit ratio adjustment rates but may be more stable. Embodiments of a control system may determine a control sensitivity based on operator input, sensor information, or some combination. Embodiments may also operate according to a first control sensitivity under a first set of conditions and change to a second control sensitivity under a second set of conditions. In some embodiments, a first set of conditions may correspond to operating a CVT in a forward direction and a second set of conditions may correspond to operating the CVT in a reverse direction, operating in a forward direction when reversal of rotation direction is imminent, operating in a forward direction when reversal of rotation direction is probable, in a forward direction when reversal of rotation direction is possible, operating in a forward direction under an increased load, or operating in a forward direction at higher vehicle speed. Other conditions may be based on sensor inputs. In some embodiments, if a sensor determines battery capacity is low or components are overheating, a control system may determine a control sensitivity that limits the axial movement of a coupling and reduce the offset angle (psi) to allow for reduced axial movement of the coupling or may increase the offset angle (psi) and reduce the frequency of commands for adjusting the axial movement of the coupling.

In a broad respect, embodiments disclosed herein may be generally directed to a ball planetary continuously variable transmission (CVT) comprising a plurality of spherical planets between and in contact with two traction rings and a sun, each planet having an axle and a geometric center through which an x-axis, y-axis and z-axis intersect, wherein the plurality of geometric centers define a pitch circle for the plurality of planets, wherein each axle extends through a central bore of a spherical planet and defines the z-axis and an axis of rotation. In some such embodiments, each planet axle is capable of tilting in a first skew plane, and has a skew angle defined as an angle between the central axis and the planet axle, and in a second tilting plane defining a tilt angle as the angle between the central axis and the planet axle, wherein the tilt angle defines a transmission ratio of the transmission. Some embodiments have a first carrier half coaxial with and rotatable about the central axis, the first carrier half coupled by a plurality of links to a first end of each of the planet axles; and a second carrier half coaxial with and rotatable about the central axis, the second carrier half coupled by a plurality of links to a second end of each of the planet axles. In some such embodiments, the first carrier half and second carrier half are rotatable with respect to each other to define an angular position, wherein relative rotation of the first and second carrier halves defines a non-zero angular position that imparts a non-zero skew angle, and wherein a non-zero skew angle imparts an adjustment to the tilt angle, resulting in a change in the transmission ratio of the CVT. In some embodiments, a plurality of couplings couple the plurality of links to the first and second carrier halves, wherein the plurality of couplings are adapted to allow the plurality of links to rotate out of plane with the first and second carrier halves to facilitate the tilting of the planet axles. The plurality of couplings may be ball joints. The plurality of links may be flexible. In some embodiments, the CVT further includes a pitch circle coaxial about the central axis and having a radius equal to a plurality of centers of the planet assemblies, a plurality of connections that connect the plurality of links to the plurality of planet axles. An effective offset angle is defined by the tangent of the pitch circle at a respective one of the plurality of connections and a line between an associated one of the plurality of connections and an associated one of the plurality of couplings. In such embodiments, the effective offset angle may be positive when the plurality of links are located radially outside of the pitch circle, a positive offset angle associated with a forward direction of rotation, and the effective offset angle may be negative when the plurality of links are located radially inside of the pitch circle, a negative offset angle associated with a reverse direction of rotation. In certain embodiments, the CVT further includes an actuator adapted to adjust the radial position of the plurality of couplings in order to adjust the effective offset angle. Certain of these embodiments include an actuator adapted to adjust the radial position of the plurality of couplings to a positive effective offset angle when the CVT is rotating in the forward direction, and adapted to adjust the radial position of the plurality of couplings to a negative offset angle when the CVT is rotating in the reverse direction.

In one broad respect, embodiments disclosed herein may be directed to a continuously variable transmission comprising a plurality of spherical planets between and in contact with two traction rings and a sun, each planet having a geometric center through which an x-axis, y-axis and z-axis intersect, wherein the plurality of geometric centers define a pitch circle for the plurality of planets, wherein an axle extends through a central bore of each of the plurality of spherical planets and defines the z-axis and an axis of rotation. In some embodiments, the control system comprises a plurality of trunnions, wherein each trunnion is coupled to each end of an axle and extends around a spherical planet to a coupling. In some embodiments, the plurality of trunnions are oriented at an offset angle (psi). In some embodiments, orientation of the plurality of traction planets such that the offset angle (psi) has a positive sign configures the CVT for operation in a first direction and orientation of the plurality of traction planets such that the offset angle (psi) has a negative sign configures the CVT for operation in a second direction. In some embodiments in which the plurality of couplings lead the spherical planets, the plurality of trunnions are oriented such that the offset angle (psi) has a positive sign for operation in a forward direction and a negative sign for operation in a reverse direction. In some embodiments in which the plurality of couplings trail the spherical planets, the plurality of trunnions are oriented such that the offset angle (psi) has a negative sign for operation in a forward direction and a positive sign for operation in a reverse direction. In some embodiments in which the axles are fixed axially to the plurality of planets, axial translation of the plurality of couplings imparts a skew condition on the plurality of traction planets to adjust a speed ratio of the CVT. In some embodiments in which the CVT further comprises a synchronizing ring coupled to the plurality of couplings, axial translation of the synchronizing ring axially translates the plurality of couplings to adjust the speed ratio of the CVT. The orientation of the plurality of trunnions is controlled by radial translation of the plurality of couplings. In some embodiments in which the couplings are fixed axially, an axial force applied to the plurality of axles imparts a skew condition on the plurality of traction planets to adjust a speed ratio of the CVT. In some embodiments in which a synchronizer is coupled to at least one end of each axle, axial translation of the synchronizer axially translates the plurality of axles to adjust a speed ratio of the CVT. In some embodiments in which the synchronizer comprises a control disc positioned on one side of the CVT, the control disc comprises a plurality of slots and an end of each axle is coupled to a slot of the plurality of slots, wherein an axial force is applied to the control disc in a first direction or a second direction opposite the first direction to adjust a speed ratio of the CVT. In some embodiments in which the synchronizer comprises a first control disc positioned on a first side of the plurality of slots and a second control disc positioned on a second side of the plurality of slots opposite the first control disc, an axial force is applied to the first control disc to apply an axial force to the axles in a first direction and an axial force is applied to the second control disc to apply an axial force to the axles in a second direction. In some embodiments in which the synchronizer comprises a plurality of arms with each arm coupled to an axle of the plurality of axles, an axial force applied to the plurality of arms applies an axial force to the plurality of axles to adjust a speed ratio of the CVT.

In another broad respect, embodiments disclosed herein may be directed to a method of controlling a continuously variable transmission (CVT) comprising a plurality of spherical planets between and in contact with two traction rings and a sun, each planet having a geometric center through which an x-axis, y-axis and z-axis intersect, wherein the plurality of geometric centers define a pitch circle for the plurality of planets, wherein an axle extends through a central bore of each of the plurality of spherical planets and defines the z-axis and an axis of rotation for that planet, and a plurality of trunnions, wherein each trunnion is coupled to each end of an axle and extends around a spherical planet coupled to the axle. In some embodiments, the method comprises rotating the plurality of trunnions about their respective z-axes to an offset angle (psi). An offset angle (psi) having a positive sign configures the CVT for operation in a first direction of rotation, and an offset angle (psi) having a negative sign configures the CVT for operation in a second direction of rotation. In some embodiments, each trunnion is coupled to a trunnion extension via a coupling with multiple degrees of freedom, wherein the method comprises axially translating the plurality of trunnion extensions to impart a skew angle (zeta) on the plurality of traction planets to cause a change in a speed ratio of the CVT, whereby the couplings allow forces generated by the axial translation to tilt the planets. In some embodiments, each trunnion is coupled to a trunnion extension with limited degrees of freedom, wherein the method comprises applying an axial force to the plurality of axles to impart the skew angle (zeta) on the plurality of traction planets to cause a change in a speed ratio of the CVT, whereby the couplings react forces generated by the axial translation of the planets to tilt the planets. In some embodiments, the method comprises axially fixing the plurality of couplings, wherein adjusting the speed ratio of the CVT comprises applying an axial force to the plurality of axles. In some embodiments, the method comprises axially fixing the plurality of axles to the plurality of traction planets, wherein adjusting the speed ratio of the CVT comprises axially translating the plurality of couplings. In some embodiments, the method comprises determining a first direction of rotation for the CVT; rotating the plurality of trunnions about their respective z-axes to a first offset angle (psi) for operation in the first direction of rotation; determining a change in direction of rotation of the CVT to a second direction of rotation; and rotating the plurality of trunnions about their respective z-axes to a second offset angle (psi) for operation in the second direction of rotation of the CVT. In some embodiments, the method comprises determining a first direction of operation; configuring the CVT for operation at a first offset angle (psi) for the first direction of rotation based on one or more of a first user input, a first operating condition and a first environmental condition; and configuring the CVT for operation at a second offset angle (psi) for the first direction of rotation based on one or more of a second user input, a second operating condition and a second environmental condition, wherein the first offset angle (psi) or the second offset angle (psi) is selected for stable operation or sensitivity.

In another broad respect, embodiments disclosed herein may be directed to a control system for a continuously variable transmission (CVT) comprising a plurality of spherical planets between and in contact with two traction rings and a sun, each planet having a geometric center through which an x-axis, y-axis and z-axis intersect, wherein the plurality of geometric centers define a pitch circle for the plurality of planets, wherein an axle extends through a central bore of each of the plurality of spherical planets and defines the z-axis and an axis of rotation. The control system comprises a controller communicatively coupled to a plurality of sensors and further coupled to a plurality of trunnions coupled to the plurality of axles, wherein each trunnion is coupled to each end of an axle and extends around a spherical planet coupled to that axle. The controller may receive signals related to performance of the CVT, performance of a prime mover coupled to the CVT, signals related to performance of a vehicle associated with the CVT, signals related to the environment, and user inputs. The controller may analyze the signals and configure the CVT. In some embodiments, the controller may configure the CVT for forward or reverse rotation. In some embodiments, the controller may configure the CVT for a desired stability or sensitivity. In some embodiments, the controller may compare the signals with values stored in memory, determine an operating condition is present and configure the CVT according to the operating condition. The operating condition may be a rollback condition, in which a vehicle containing the CVT is in a rollback condition or about to encounter a rollback condition. In some embodiments, the controller may analyze the signals and determine a rollback condition is possible and configure the CVT for increased sensitivity. Configuring the CVT for increased sensitivity may include adjusting trunnions to a smaller offset angle (psi). In some embodiments, the smaller offset angle may be less than 10 degrees. In some embodiments, configuring the CVT for increased sensitivity may include increasing the rate at which sensors send signals to the controller. In some embodiments the controller may configure the CVT for increased stability, which may include adjusting trunnions to a higher offset angle (psi). Adjusting the trunnions may comprise radially translating a control point for each trunnion to a radial position relative to a pitch circle or rotating the trunnions to an offset angle (psi). Each trunnion comprises a coupling, wherein a control point is defined along a line passing through the geometric center of each traction planet and the coupling for that traction planet, wherein a position of a plurality of control points radially outside the pitch circle configures the CVT for a first direction, wherein a position of the plurality of control points radially inside the pitch circle configures the CVT for a second direction opposite the first direction. An axial translation of the plurality of control points, an axial force applied to the plurality of axles, or a combination thereof misaligns the plurality of axles relative to a longitudinal axis of the CVT to adjust a tilt angle of the plurality of planets. In some embodiments in which the plurality of couplings lead the spherical planets, the controller may position the plurality of control points radially inward of the pitch circle for operation in a forward direction of rotation or radially outward of the pitch circle for operation in a reverse direction of rotation. In some embodiments in which the plurality of couplings trail the spherical planets, a controller may position the plurality of control points radially outward of the pitch circle for operation in a forward direction of rotation or radially inward of the pitch circle for a reverse direction of rotation. In some embodiments, the plurality of axles are axially fixed to the plurality of planets and the CVT further comprises a plurality of trunnion extensions coupled to the plurality of couplings and a synchronizing ring. A controller may control a radial position of the plurality of couplings by radial translation of the plurality of trunnion extensions. A controller may command an axial translation of the synchronizing ring to axially translate the plurality of couplings to adjust the speed ratio of the CVT. In some embodiments, the couplings are fixed axially, and a controller may command an axial force be applied to the plurality of axles to impart a non-zero skew condition to the plurality of planets. The non-zero skew condition causes the CVT to adjust a tilt angle of the plurality of spherical planets. In some embodiments, a synchronizer is coupled to at least one end of each axle, wherein a controller commanding an axial force applied to the synchronizer misaligns the plurality of axles to adjust a tilt angle of the plurality of traction planets. In some embodiments, the synchronizer comprises a control disc positioned on one side of the CVT. The control disc has a plurality of slots and an end of each axle is coupled to a slot of the plurality of slots. An axial force applied to the control disc in a first direction or a second direction opposite the first direction imparts a non-zero skew condition to adjust a tilt angle of the plurality of traction planets. In some embodiments, the synchronizer comprises a first control disc positioned on a first side of the plurality of slots and a second control disc positioned on a second side of the plurality of slots opposite the first control disc, wherein a controller commanding an axial force applied to the first control disc applies an axial force to the axles in a first direction to impart a non-zero skew condition to adjust a tilt angle of the plurality of traction planets toward underdrive, or an axial force applied to the second control disc applies an axial force to the axles in a second direction to impart a non-zero skew condition to adjust a tilt angle of the plurality of traction planets toward overdrive. In some embodiments, the synchronizer comprises a plurality of arms. Each rigid member is coupled to an axle of the plurality of axles, wherein an axial force applied to the plurality of arms applies an axial force to the plurality of axles to adjust a tilt angle of the plurality of traction planets.

In another broad respect, embodiments disclosed herein may be generally directed to a method of controlling a continuously variable transmission (CVT) comprising a plurality of spherical planets between and in contact with two traction rings and a sun, each planet having a geometric center through which an x-axis, y-axis and z-axis intersect, wherein the plurality of geometric centers define a pitch circle for the plurality of planets, wherein an axle extends through a central bore of each of the plurality of spherical planets and defines the z-axis and an axis of rotation for that planet, and a plurality of trunnions, wherein each trunnion is coupled to each end of an axle and extends around a spherical planet coupled to that axle, wherein each trunnion comprises a coupling, wherein a control point is defined along a line passing through the geometric center of each traction planet and the coupling for that traction planet. In some embodiments, rotating the plurality of trunnions about their respective z-axes to an offset angle (psi) comprises determining a control scheme and rotating the plurality of trunnions to the offset angle (psi) based on the control scheme. In some embodiments, the plurality of trunnions are rotated to a larger angle associated with a control scheme selected for stable operation or are rotated to a smaller angle associated with a control scheme selected for increased sensitivity.

In another broad respect, embodiments disclosed herein may be generally directed to a control system for a ball planetary continuously variable transmission (CVT) comprising a plurality of spherical planets between and in contact with two traction rings and a sun, each planet having a geometric center through which an x-axis, y-axis and z-axis intersect, wherein the plurality of geometric centers define a pitch circle for the plurality of planets, wherein an axle extends through a central bore of each of the plurality of spherical planets and defines the z-axis and an axis of rotation. In some embodiments, the control system comprises a plurality of trunnions coupled to the plurality of axles, wherein each trunnion comprises a first link coupled to a first end of an axle, a second link coupled to a second end of the axle, and a center link coupled to the first link and the second link. A first actuator may configure the plurality of trunnions to an offset angle (psi) relative to the pitch circle. A second actuator may rotate the center link. A controller communicatively coupled to the actuator and a plurality of sensors may be configured to receive signals from the plurality of sensors, determine a direction of rotation for the CVT, send a first signal to the first actuator to adjust the offset angle (psi) of the plurality of trunnions and send a signal to the second actuator to impart a skew angle (zeta) on the plurality of axles to adjust a tilt angle. In some embodiments, if the plurality of trunnions lead the plurality of planets and the offset angle (psi) is positive, the CVT is configured for operation in a forward direction. In some embodiments, if the plurality of trunnions trail the plurality of planets and the offset angle (psi) is negative, the CVT is configured for operation in forward direction. A speed ratio of the CVT may be based on the tilt angle, the skew angle and the offset angle. The controller may receive signals related to performance of the CVT, performance of a prime mover coupled to the CVT, signals related to performance of a vehicle associated with the CVT, signals related to the environment, and user inputs. The controller may analyze the signals and configure the CVT. In some embodiments, the controller may configure the CVT for forward or reverse rotation. In some embodiments, the controller may configure the CVT for a desired stability or sensitivity. In some embodiments, the controller may compare the signals with values stored in memory, determine an operating condition is present and configure the CVT according to the operating condition. The operating condition may be a rollback condition, in which a vehicle containing the CVT is in a rollback condition or about to encounter a rollback condition. In some embodiments, the controller may analyze the signals and determine a rollback condition is possible and configure the CVT for increased sensitivity. In some embodiments, the controller is further configured to change the offset angle (psi) in response to determining a change in the direction of rotation or receiving an input to change the direction of rotation. In some embodiments, the controller is further configured to adjust the offset angle (psi) to have a larger magnitude for a first control scheme for stable control or to have a smaller magnitude for a second control scheme for increased sensitivity.

In another broad respect, embodiments disclosed herein may be generally directed to a ball planetary continuously variable transmission (CVT) comprising a plurality of spherical planets between and in contact with two traction rings and a sun, each planet having a geometric center through which an x-axis, y-axis and z-axis intersect, wherein the plurality of geometric centers define a pitch circle for the plurality of planets, wherein an axle extends through a central bore of each of the plurality of spherical planets and defines the z-axis and an axis of rotation, and a control system. The control system may comprise a plurality of trunnions coupled to the plurality of axles, a first actuator for configuring the plurality of trunnions to an offset angle (psi) relative to the pitch circle, a second actuator for rotating the center link and a controller communicatively coupled to the actuator and a plurality of sensors. In some embodiments, each trunnion comprises a first link coupled to a first end of an axle, a second link coupled to a second end of the axle, and a center link coupled to the first link and the second link. In some embodiments, the controller is configured to receive signals from the plurality of sensors, determine a direction of rotation for the CVT, send a first signal to the first actuator to adjust the offset angle (psi) of the plurality of trunnions, and send a signal to the second actuator to impart a skew angle (zeta) on the plurality of axles to adjust a tilt angle. In some embodiments, if the plurality of trunnions lead the plurality of planets and the offset angle (psi) is positive, a controller may configure the CVT for operation in a forward direction. In some embodiments, if the plurality of trunnions trail the plurality of planets and the offset angle (psi) is negative, a controller may configure the CVT for operation in forward direction. In some embodiments, a speed ratio of the CVT may be based on the tilt angle, the skew angle and the offset angle. In some embodiments, the first link and the second link comprise rigid members.

In another broad respect, embodiments disclosed herein may be generally directed to a control system for a continuously variable transmission (CVT) comprising a plurality of spherical planets between and in contact with two traction rings and a sun, each planet having a geometric center through which an x-axis, y-axis and z-axis intersect, wherein the plurality of geometric centers define a pitch circle for the plurality of planets, wherein an axle extends through a central bore of each of the plurality of spherical planets and defines the z-axis and an axis of rotation. The control system comprises a first carrier member located on a first side of the CVT, a first plurality of arms on the first side of the CVT, a second carrier member located on a second side of the CVT, a second plurality of arms, a first actuator for rotating one or more of the first carrier and the second carrier to an angular orientation of the first carrier relative to the second carrier member, and a controller communicatively coupled to the actuator and a plurality of sensors. A first end of each arm of the first plurality of arms is coupled to a first end of an axle and a second end of each arm of the first plurality of arms is coupled to the first carrier member. A first end of each arm of the second plurality of arms is coupled to a second end of an axle and a second end of each arm of the second plurality of arms is coupled to the second carrier member. The controller configured to receive signals from the plurality of sensors and command the first actuator to rotate the first carrier member relative to the second carrier member, wherein rotation of the first carrier member relative to the second carrier member imparts a skew condition on the plurality of planets to tilt the plurality of axles to a tilt angle associated with a speed ratio for the CVT. In some embodiments, the first plurality of arms are movable relative to the first carrier member and the second plurality of arms are movable relative to the second carrier member and the control system further comprises a second actuator for radially rotating one or more of the first plurality of arms and the second plurality of arms to an offset angle (psi) to configure the CVT for operation in a forward direction of rotation or reverse direction of rotation. The controller may receive signals related to performance of the CVT, performance of a prime mover coupled to the CVT, signals related to performance of a vehicle associated with the CVT, signals related to the environment, and user inputs. The controller may analyze the signals and configure the CVT. In some embodiments, the controller may configure the CVT for forward or reverse rotation. In some embodiments, the controller may configure the CVT for a desired stability or sensitivity. In some embodiments, the controller may compare the signals with values stored in memory, determine an operating condition is present and configure the CVT according to the operating condition. The operating condition may be a rollback condition, in which a vehicle containing the CVT is in a rollback condition or about to encounter a rollback condition. In some embodiments, the controller may analyze the signals and determine a rollback condition is possible and configure the CVT for increased sensitivity. In some embodiments, the controller is further configured to change the offset angle (psi) in response to determining a change in the direction of rotation or receiving an input to change the direction of rotation. In some embodiments, the controller is further configured to adjust the offset angle (psi) to have a larger magnitude for a first control scheme for stable control or to have a smaller magnitude for a second control scheme for increased sensitivity. In some embodiments, the controller is configured to receive a user input for one or more of a direction of rotation, a control mode, and a speed ratio. In some embodiments, orientation of the first plurality of arms to a positive first offset angle (psi) relative to the first carrier member and orientation of the second plurality of arms to a positive second offset angle (psi) relative to the second carrier member configures the CVT for operation in a first direction of rotation, wherein orientation of the first plurality of arms to a negative first offset angle (psi) relative to the first carrier member and orientation of the second plurality of arms to a negative second offset angle (psi) relative to the second carrier member configures the CVT for operation in a second direction of rotation. In some embodiments, if the first carrier member and the second carrier member lead the plurality of axles, orientation of the first plurality of arms to a positive first offset angle (psi) and orientation of the second plurality of arms to a positive second offset angle (psi) configures the CVT for operation in forward direction and orientation of the first plurality of arms to a negative first offset angle (psi) and orientation of the second plurality of arms to a negative second offset angle (psi) configures the CVT for operation in reverse direction, and wherein if the first carrier member and the second carrier member trail the plurality of axles, orientation of the first plurality of arms to a positive first offset angle (psi) and orientation of the second plurality of arms to a positive second offset angle (psi) configures the CVT for operation in reverse direction and orientation of the first plurality of arms to a negative first offset angle (psi) and orientation of the second plurality of arms to a negative second offset angle (psi) configures the CVT for operation in forward direction. In some embodiments, at least one of the first plurality of arms and the second plurality of arms is formed as a resilient member. In some embodiments, at least one of the first plurality of arms and the second plurality of arms is formed with directional resiliency.

In another broad respect, embodiments disclosed herein may be generally directed to a continuously variable transmission (CVT) comprising a plurality of spherical planets between and in contact with two traction rings and a sun, each planet having a geometric center through which an x-axis, y-axis and z-axis intersect, wherein the plurality of geometric centers define a pitch circle for the plurality of planets, wherein an axle extends through a central bore of each of the plurality of spherical planets and defines the z-axis and an axis of rotation. In some embodiments, orientation of the first plurality of arms to a positive first offset angle (psi) relative to the first carrier member and orientation of the second plurality of arms to a positive second offset angle (psi) relative to the second carrier member configures the CVT for operation in a first direction of rotation. In some embodiments, orientation of the first plurality of arms to a negative first offset angle (psi) relative to the first carrier member and orientation of the second plurality of arms to a negative second offset angle (psi) relative to the second carrier member configures the CVT for operation in a second direction of rotation. In some embodiments, if the first carrier member and the second carrier member lead the plurality of axles, orientation of the first plurality of arms to a positive first offset angle (psi) and orientation of the second plurality of arms to a positive second offset angle (psi) configures the CVT for operation in forward direction and orientation of the first plurality of arms to a negative first offset angle (psi) and orientation of the second plurality of arms to a negative second offset angle (psi) configures the CVT for operation in reverse direction. In some embodiments, if the first carrier member and the second carrier member trail the plurality of axles, orientation of the first plurality of arms to a positive first offset angle (psi) and orientation of the second plurality of arms to a positive second offset angle (psi) configures the CVT for operation in reverse direction and orientation of the first plurality of arms to a negative first offset angle (psi) and orientation of the second plurality of arms to a negative second offset angle (psi) configures the CVT for operation in forward direction. In some embodiments, at least one of the first link and the second link is formed as a resilient member. In some embodiments, at least one of the first link and the second link is formed with directional resiliency.

In another broad respect, embodiments disclosed herein may be generally directed to a method of adjusting a speed ratio of a continuously variable transmission (CVT) comprising a plurality of spherical planets between and in contact with two traction rings and a sun, each planet having a geometric center through which an x-axis, y-axis and z-axis intersect, wherein the plurality of geometric centers define a pitch circle for the plurality of planets, wherein an axle extends through a central bore of each of the plurality of spherical planets and defines the z-axis and an axis of rotation. In some embodiments, the method comprises rotating a first carrier member relative to a second carrier member, wherein the first carrier member is coupled to a first plurality of arms, wherein each arm of the first plurality of arms is coupled to a first end of an axle of a traction planet, wherein the second carrier member is coupled to a second plurality of arms, wherein each arm of the second plurality of arms coupled to a second end of the axle of a traction planet, wherein rotating the first carrier member relative to the second carrier member misaligns the plurality of axes of rotation relative to a longitudinal axis of the CVT to change a speed ratio of the CVT. In some embodiments, the method includes adjusting an offset angle (psi) for the first plurality of arms and the second plurality of arms, wherein a positive offset angle (psi) configures the CVT for operation in a first direction of rotation, wherein a negative offset angle (psi) configures the CVT for operation in a second direction of rotation. In some embodiments, adjusting an offset angle (psi) for the first plurality of arms and the second plurality of arms comprises adjusting a magnitude of the offset angle (psi). In some embodiments, the magnitude is based on a control scheme, wherein the offset angle (psi) is adjusted to a larger magnitude for stable control or adjusted to a smaller magnitude for increased sensitivity. In some embodiments, one or more of the control scheme, the direction of rotation and the speed ratio are user input received from a user interface.

These, and other, aspects of the disclosed technology will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. The following description, while indicating various embodiments of the disclosed technology and numerous specific details thereof, is given by way of illustration and not of limitation. Many substitutions, modifications, additions or rearrangements may be made within the scope of the disclosed technology, and the disclosed technology includes all such substitutions, modifications, additions or rearrangements.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings accompanying and forming part of this specification are included to depict certain aspects of the disclosed technology. A clearer impression of the disclosed technology, and of the components and operation of systems provided with the disclosed technology, will become more readily apparent by referring to the exemplary, and therefore non-limiting, embodiments illustrated in the drawings, wherein identical reference numerals designate the same components. Note that the features illustrated in the drawings are not necessarily drawn to scale.

FIG. 1A depicts a schematic diagram of a continuously variable transmission relative to global and planet-centered coordinate systems;

FIGS. 1B and 1C depict schematic diagrams of planet-centered coordinate systems and relative coordinate systems, illustrating relationships between skew and tilt in ball-planetary continuously variable transmissions;

FIG. 1D depicts a schematic diagram of certain kinematic relationships between contacting components of a CVT, illustrating how the inducement of a skew condition generates forces that tend to adjust a tilt angle;

FIG. 1E depicts a generalized, representative traction curve that can be applied at each of contact areas 1, 2, 3, illustrating a relationship between the traction coefficient μ and the relative velocity between contacting components;

FIGS. 1F and 1G depict front and top schematic diagrams, illustrating traction forces exerted relative to a planet under non-zero skew conditions;

FIGS. 2A-2J depict partial perspective, side and front views of a CVT, illustrating one embodiment of a control system capable of operation in forward direction and reverse direction;

FIGS. 3A-3J depict front partial views of a CVT, illustrating one embodiment of a control system capable of operation in forward direction and reverse direction; and

FIGS. 4A-4O depict partial perspective, side and front views of a CVT, illustrating one embodiment of a control system capable of operation in forward direction and reverse direction.

DETAILED DESCRIPTION OF CERTAIN ILLUSTRATIVE EMBODIMENTS

Systems and methods and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known starting materials, processing techniques, components and equipment are omitted so as not to unnecessarily obscure the disclosed technology in detail. It should be understood, however, that the detailed description and the specific examples, while indicating certain embodiments of the disclosed technology, are given by way of illustration only and not by way of limitation. Various substitutions, modifications, additions and/or rearrangements within the spirit and/or scope of this disclosure will become apparent to those skilled in the art from this disclosure.

Embodiments disclosed herein comprise ball-planetary continuously variable transmissions (CVTs) in which a plurality of planets are interposed between and in contact with traction rings and a sun, in which tilting of the planets changes a speed ratio of the CVT.

Speed ratio may vary between underdrive and overdrive. In underdrive, power enters a first traction ring with a first torque and a first speed and is transferred through planets to a second traction ring with a second torque higher than the first torque and a second speed lower than the first speed. In overdrive, power enters the first traction ring with a first torque and a first speed and is transferred through planets to the second traction ring with a lower torque greater than the first torque and a second speed higher than the first speed.

Each planet has a geometric center, with an x-axis, y-axis and z-axis for that planet intersecting at its geometric center. The geometric centers of planets arranged angularly around a longitudinal axis collectively define a pitch circle for the plurality of planets.

Each planet is coupled to an axle. Each axle defines an axis of rotation, which is aligned with a z-axis of a planet. Tilting axles to a non-zero tilt angle (gamma) causes contact points between planets and traction rings to change, adjusting a speed ratio of a CVT. Those skilled in the art will appreciate that for a change in speed ratio of a CVT, there is also a reciprocal change in torque ratio. Thus, a change that results in an increase in speed ratio will have a decrease in torque ratio, and a change that results in a decrease in speed ratio will have an increase in torque ratio.

As used herein, the terms “axial”, “axially” and the like refer to a direction along or parallel to a longitudinal axis of the CVT.

As used herein, the terms “radial”, “radially” and the like refer to a direction perpendicular to a longitudinal axis of the CVT.

For ease of understanding, direction 25 refers to a forward rotation (also referred to as a design direction) and direction 26 refers to reverse rotation, and in the embodiments illustrated power is transferred from first traction ring 102 to second traction ring 104.

Embodiments disclosed herein may include a control system configurable to adjust a CVT, such as CVT 200, to a target speed ratio for operation in a forward direction or a reverse direction, including maintaining a speed ratio during a switch between operation in forward direction and operation in a reverse direction, and operate according to a control scheme for increased stability or sensitivity. FIGS. 2A-2J depict front and side views of CVT 200 comprising a plurality of planets 108 interposed between traction rings 102, 104 and sun 110, illustrating CVT 200 configured for operation at 1:1, underdrive and overdrive speed ratios in forward and reverse directions.

As depicted in FIGS. 2A-2J, planets 108 are coupled to tiltable axles 103 that define axes of rotation 106 which are coaxial with the z-axes for planets 108. Axles 103 are coupled to planets 108 such the planets 108 may rotate about axes of rotation 106. If present, bearings 107 may facilitate rotation of axles 103 in trunnions 220. In embodiments depicted in FIGS. 2A-2J, bearings 107 allow axles 103 to rotate relative to trunnions 220 but axially fix axles 103 relative to trunnions 220.

Trunnions 220 may be machined or otherwise formed as rigid members for coupling to axles 103 to allow a control system to adjust an orientation of planets 108 in operation to adjust a speed ratio in forward direction and reverse direction. Trunnions 220 are rotatably coupled to axles 103 on either side of planets 108. FIGS. 2A-2J depict embodiments of trunnions 220 formed as arcuate rigid members. However, trunnions 220 may be formed having any shape capable of coupling to both ends of axle 103 and not contacting planets 108. FIGS. 2A-2J depict embodiments in which trunnions 220 are formed such that axles 103 and bearings 107 may be accessible via openings 223. However, trunnions 220 may be formed with smaller openings 223 such that only axles 103 are accessible, including without openings 223. Trunnions 220 are formed having an effective length defined along line 23 between a first intersection A of line 23 and radial line 20 and a second intersection B of line 23 and radial line 22. Offset 40 may result in an angular offset, allow clearance between trunnions 220 and planets 108, allow for ease in assembly, and other advantages.

Couplings 215 on trunnions 220 allow trunnions 220 one or more degrees of freedom relative to trunnion extensions 213. FIGS. 2A-2J depict CVT 200 with one embodiment of coupling 215 as a ball and socket coupling, which allows for multiple degrees of freedom. Other shapes and configurations of coupling 215 may be used to provide fewer or more degrees of freedom.

Trunnion extensions 213 may be coupled to ring 212 such that axial translation and circumferential rotation of trunnion extensions 213 are fixed relative to ring 212, but radial translation of trunnion extensions 213 and rotation about radial lines 22 are possible. For example, as depicted in FIGS. 2A-2J, trunnion extensions 213 are cylindrical and ring 212 is formed with openings 216 such that trunnion extensions 213 are restricted to radial translation along radial lines 22 and/or rotation about radial lines 22.

For purposes of describing concepts related to embodiments such as CVT 200, FIGS. 2B-2J refer to point A and point B, which are approximate locations. For example, point A is depicted as coincident with the intersection of axis of rotation 106 and a midplane of axle 103, but the exact location of point A will depend on factors such as tilt angle (gamma) 28, skew angle (zeta) 27, offset angle (psi) 24, the input speed of first traction ring 102, the output speed of second traction ring 104, a friction coefficient between components, the presence and characteristics of a traction fluid. Thus, at 1:1 ratio, point A may be generally coincident with the intersection of axis of rotation 106 and a midplane of axle 103. At full underdrive or full overdrive, point A may not be coincident with the intersection of axis of rotation 106 and a midplane of axle 103. Similarly, point B is depicted as coincident with an intersection of radial line 22 and line 23 passing through a geometric center of planets 108, but the exact position of point B will depend on factors such as tilt angle (gamma) 28, skew angle (zeta) 27, offset angle (psi) 24, the input speed of first traction ring 102, the output speed of second traction ring 104, a friction coefficient between components, and the presence and characteristics of a traction fluid. Accordingly, when referring to point A or point B in the accompanying figures, an arrow depicts an approximate location of point A or point B.

Radial translation or axial translation of trunnion extensions 213 may be controlled by an actuator. In some embodiments, ring 212 may be coupled to one or more actuators (not shown). An actuator may axially translate ring 212 or radially translate trunnion extensions 213. An actuator may be actuated manually, such as by a person adjusting a lever or twisting a grip, or an actuator may be controlled electronically, such as by a controller operating a set of instructions and communicatively coupled to an electronic servo, encoder, or hydraulic pump.

Axial translation of ring 212 distance D axially translates each trunnion extension 213 distance D to rotate trunnion 220, axle 103 and planet 108 about point A. Multiple degrees of freedom associated with coupling 215 allow ring 212 to translate axially but allow each trunnion 220, axle 103 or planet 108 to be rotated about its respective y-axis.

In operation, an actuator (controlled manually or by an electronic controller) may orient trunnions 220 to an offset angle (psi) 24 relative to pitch circle 12. Offset angle (psi) 24 may have a first sign (e.g., positive) during forward rotation and an opposite sign (e.g., negative) during reverse rotation. For embodiments such as those depicted with respect to FIGS. 2A-2J in which couplings 215 lead planets 108 in forward rotation and trail planets 108 in reverse rotation, a positive offset angle (psi) (that is, coupling 215 is translated radially inward to orient trunnions 220 to a positive offset angle (psi) 24 relative to pitch circle 12) configures CVT 200 for operation in a forward direction, and a negative offset angle (psi) 24 (that is, coupling 215 is translated radially outward to orient trunnions 220 to a negative offset angle (psi) 24 relative to pitch circle 12) configures CVT 200 for operation in a reverse direction. Offset angle (psi) 24 of trunnions 220 may be changed independently or concurrently with a change in axial translation D of couplings 215 or skew angle (zeta) 27 of axles 103.

FIGS. 2A-2J depict embodiments at 1:1, underdrive and overdrive, in forward rotation and reverse rotation. Each trunnion 220 is movably coupled to trunnion extension 213 coupled to ring 212. Ring 212 may be translated axially relative to longitudinal axis 15 a distance D to misalign axles 103 (and therefore axes of rotation 106) of planets 108. Skew angle (zeta) 27 in conjunction with axial constraint of planets 108 results in spin-induced forces causing axles 103 to tilt to tilt angle (gamma) 28. Skew angle (zeta) 27 to which axles 103 are misaligned may be determined based on an axial translation of synchronizing ring 212 relative to center plane 14 of CVT 200 as defined by the geometric centers of planets 108. In some embodiments, offset angle (psi) 24 depends on a distance that trunnion extensions 213 are translated radially outward or inward of pitch circle 12.

As depicted in FIGS. 2A-2C and 2F-2H, center plane 13 of carrier 212 is coplanar with center plane 14 of CVT 200 such that a distance D between center plane 13 of carrier 212 and center plane 14 of CVT 200 is zero. Under these conditions, skew angle (zeta) 27 applied to planets 108 is zero. As axles 103 react to unbalanced forces and tilt to an equilibrium state, tilt angle (gamma) 28 adjusts to zero, and the speed ratio of CVT 200 is 1:1 (minus any losses). As depicted in FIGS. 2A-2D, when coupling 215 is radially inward of pitch circle 12, trunnions 220 are oriented to a positive offset angle (psi) 24 and CVT 200 is configured for forward rotation 25.

As depicted in FIG. 2D, synchronizing ring 212 may be translated distance D toward second traction ring 104 such that trunnion extension 213 and coupling 215 are translated axially toward second traction ring 104. Since planets 108 are axially constrained but capable of rotation about their respective y-axes, an axial translation of couplings 215 imparts a skew angle (zeta) 27 on axles 103, with skew angle (zeta) 27 being a function of one or more of distance D of axial translation of synchronizing ring 212, width 222 of trunnions 220, and the length of line AB. Tilt angle (gamma) 28 is a function of one or more of skew angle (zeta) 27 and offset angle (psi) 24. FIG. 2D depicts CVT 200 with a positive offset angle (psi) 24 and configured in underdrive for forward rotation 25.

As depicted in FIG. 2E, synchronizing ring 212 may be translated axially toward first traction ring 102 such that trunnion extensions 213 and couplings 215 are translated axially toward first traction ring 102. If axles 103 are axially fixed relative to planets 108, the axial translation imparts skew angle (zeta) 27 on trunnions 220, with skew angle (zeta) 27 being a function of one or more of distance D of axial translation of trunnion extensions 215, width 222 of trunnions 220, and the length of line AB. Rotation of each planet 108 about a corresponding y-axis results in spin-induced (traction) forces on that planet 108. As these forces are exerted on planets 108, friction and other forces in CVT 200 act to return CVT 200 to a balanced state. If trunnion extension 213 is maintained axial distance D from center plane 14 of CVT 200, returning to a balanced state results in planet axles 103 (and therefore planets 108) tilting to a new tilt angle (gamma) 28 corresponding to a zero-skew condition. Embodiments described herein may continuously adjust distance D to adjust a speed ratio of CVT 200. Tilt angle (gamma) 28 is a function of one or more of skew angle (zeta) 27 and offset angle (psi) 24. FIG. 2E depicts CVT 200 with a positive offset angle (psi) 24 and configured in overdrive for forward rotation 25.

As depicted in FIGS. 2F-2H, center plane 13 of carrier 212 may be translated axially to a position that is coplanar with center plane 14 of CVT 200 such that a distance D between center plane 13 of carrier 212 and center plane 14 of CVT 200 is zero. Under these conditions, skew angle (zeta) 27 is zero, which may be characterized as having zero or minimal spin-induced forces. A lack of spin-induced forces causes planets 108 to tilt to an equilibrium position in which tilt angle (gamma) 28 is zero, and the speed ratio of CVT 200 is 1:1 (minus any losses). As depicted in FIGS. 2F-2H, when coupling 215 is radially outward of pitch circle 12 of planets 108, offset angle (psi) 24 is negative and CVT 200 is configured for reverse direction 26.

As depicted in FIG. 2J, synchronizing ring 212 may be translated distance D toward second traction ring 104 such that trunnion extension 213 and coupling 215 are translated axially toward second traction ring 104. If axles 103 are axially fixed relative to planets 108, the axial translation imparts skew angle (zeta) 27 on trunnions 220, with skew angle (zeta) 27 being a function of one or more of distance D of axial translation of trunnion extensions 215, width 222 of trunnions 220, and the length of line AB. Rotation of each planet 108 about a corresponding y-axis results in spin-induced (traction) forces on that planet 108. As these forces are exerted on planets 108, friction and other forces in CVT 200 act to return CVT 200 to a balanced state. If trunnion extensions 213 are maintained axial distance D from center plane 14 of CVT 200, returning to a balanced state results in planet axles 103 (and therefore planets 108) tilting to a new tilt angle (gamma) 28 corresponding to a zero-skew condition. Embodiments described herein may continuously adjust distance D to adjust a speed ratio of CVT 200. Tilt angle (gamma) 28 is a function of one or more of skew angle (zeta) 27 and offset angle (psi) 24. FIG. 21 depicts CVT 200 with a negative offset angle (psi) 24 and configured in overdrive for operation in reverse direction 26.

As depicted in FIG. 2J, synchronizing ring 212 may be translated axially toward first traction ring 102 such that trunnion extension 213 and coupling 215 are translated axially toward first traction ring 102. If axles 103 are axially fixed relative to planets 108, the geometric center of planets 108 may serve as control points. The axial translation rotates trunnions 220 to skew angle (zeta) 27, with skew angle (zeta) 27 being a function of one or more of distance D of axial translation of trunnion extensions 215, width 222 of trunnions 220, and the length of line AB. Rotation of each planet 108 about a corresponding y-axis results in spin-induced (traction) forces on that planet 108. As these forces are exerted on planets 108, friction and other forces in CVT 200 act to return CVT 200 to a balanced state. If trunnion extensions 213 are maintained axial distance D from center plane 14 of CVT 200, returning to a balanced state results in planet axles 103 (and therefore planets 108) tilting to a new tilt angle (gamma) 28 corresponding to a zero-skew condition. Embodiments described herein may continuously adjust distance D to adjust a speed ratio of CVT 200. Tilt angle (gamma) 28 is a function of one or more of skew angle (zeta) 27 and offset angle (psi) 24. FIG. 21 depicts CVT 200 with a negative offset angle (psi) 24 and configured in underdrive for operation in reverse rotation 26.

Offset angle (psi) 24 may be adjusted to any angle within a range of positive and negative angles. In some embodiments, a range of offset angle (psi) 24 may be selected to allow operation of CVT 200 in forward or reverse direction and capable of operating according to different control schemes. Persons skilled in the art will appreciate that rotation of trunnions 220 to new offset angles (psi) 24 results in one or more of the following states:

- for increased offset angle (psi) 24, CVT 200 becomes more stable but sensitivity is decreased, resulting in adjusting speed ratios taking more time or adjusting at a slower rate;
- for offset angles (psi) that approach zero, the speed at which speed ratios may be adjusted may be faster, but the stability of CVT 200 is diminished.

For example, a range may include larger angles (for example, but not limited to, up to +15 degrees) to allow CVT 200 to use a control scheme for stable operation during forward rotation or for increased sensitivity, and may include larger angles (for example, but not limited to, up to −15 degrees) to also allow CVT 200 to use a control scheme for stable operation or for increased sensitivity during operation in reverse direction 26. In other embodiments, a range may include larger angles (for example, but not limited to, up to +15 degrees) to allow CVT 200 to use a control scheme for stable operation during forward rotation or for increased sensitivity, but may include smaller angles (for example, but not limited to, up to −5 degrees) to allow CVT 200 to use a control scheme for increased sensitivity during operation in reverse direction 26.

Adjustment of CVT 200 may involve changing the sign of offset angle (psi) 24. In some embodiments, radial translation of couplings 215 from a position radially outward of pitch circle 12 of planets 108 to a position radially inward of pitch circle 12 of planets 108 (or vice versa) changes the sign of offset angle (psi) 24 from positive to negative or negative to positive, respectively. As depicted in FIGS. 2E-2H, when couplings 215 are radially outward of pitch circle 12 of planets 108, offset angle (psi) 24 is negative, and CVT 200 is configured for operation in reverse direction 26.

Embodiments may change skew angle (zeta) 27 to accommodate changes in offset angle (psi) 24. For example, if CVT 200 is operating in forward direction 25 in underdrive and CVT 200 needs to be operating in reverse direction 26 in underdrive, embodiments may configure CVT 200 by changing offset angle (psi) 24 from a first sign (e.g., positive) to a second sign (e.g., negative) and axially translating couplings 215 from a first side of center plane 14 of CVT 200 to a second side of center plane 14 of CVT 200 opposite the first side.

As described in relation to FIGS. 2A-2J, adjusting a CVT may include axial constraint between a planet and a trunnion and adjustment may be accomplished by axial translation of a trunnion extension. Variations are possible. For example, in some embodiments, couplings 215 may be fixed axially and adjustment of CVT 200 may be accomplished by axial translation of axles 103 relative to planets 108. In these embodiments, bearings 107, axles 103, or planets 108 may allow for axial translation of planets 108 relative to axles 103. In some embodiments, an actuator may be coupled to a torus plate, a control disc, spider arms, or other synchronizer (not shown) coupled to axles 103 or trunnions 220. The actuator may translate the synchronizer to impart an axial translation of axles 103 relative to planets 108. Axial translation of axles 103 relative to planets 108 while restricting axial movement of coupling 215 will impart a non-zero skew angle (zeta) 24 on planets 108, adjusting axles 103 to a target tilt angle (gamma) 28 such that CVT 200 operates at a target speed ratio. In some embodiments, a synchronizer may comprise a single control disc coupled to one end of axles 103. In other embodiments, a synchronizer may comprise a first control disc coupled to a first end of axles 103 and a second control disc coupled to a second end of axles 103. The pair of control discs may be coupled such that axial translation of one control disc equals axial translation of the second control disc.

Embodiments disclosed herein may refer to a CVT with a control system capable of controlling a tilt angle using two carrier halves coupled to links. In these embodiments, one or both carrier halves are rotatable independently or collectively to an angular position (beta) to impart a skew angle (zeta) on planet axles to adjust a tilt angle (gamma) for a plurality of planets coupled to the planet axles. Furthermore, to enable forward and reverse rotation, the control system may control an offset angle (psi) of the links) for operation in forward direction and reverse directions or for a selected sensitivity.

FIGS. 3A-3J depict CVT 300 in which two carrier halves 310A, 310B may be rotated relative to each other to angular position (beta) 29, imparting a non-zero skew angle (zeta) 27 on axles 103 to cause axles 103 to adjust a speed ratio of CVT 300. A non-zero skew angle (zeta) 27 causes a non-zero skew condition, and spin-induced (traction) forces generated by the geometry and configuration of CVT 300 adjusts a tilt angle (gamma) 28 of axles 103. During forward rotation, links 321 may be rotated about axes of rotation 106 (coaxial with the z-axes of axles 103) to a positive offset angle (psi) as depicted in FIGS. 3A-3E, and during reverse rotation, links 321 may be rotated about axes of rotation 106 to a negative offset angle (psi) as depicted in FIGS. 3F-3J.

Links 321 comprise a first end coupled to axles 103 and a second end coupled to pins 312. Pins 312 may translate along slots 313 in carrier arms 311A on carrier half 310A and pins 312 may translate along slots 313 in carrier arms 311B on carrier half 310B. Pins 312 may be located at a first radial position in slots 313 in carrier arms 311A and pins 312 may be located at a second radial position in slots 313 in carrier arms 311B. Thus, a first offset angle (psi) 24A on a first side of CVT 300 and a second offset angle (psi) 24B on a second side of CVT 300 may be, but are not required to be, the same angle, or even the same sign. The difference between first offset angle (psi) 24A and second offset angle (psi) 24B is the effective offset angle (psi) 24 for CVT 300. Assuming a positive effective offset angle (psi) 24 is more stable for operation in a forward direction, CVT 300 may be configured for operation in a forward direction with each of first offset angle (psi) 24A and second offset angle (psi) 24B having any angle such that effective offset angle (psi) 24 is positive, including combinations in which first offset angle (psi) 24A and second offset angle (psi) 24B are both positive, first offset angle (psi) 24A is negative and second offset angle (psi) 24B is positive and larger in magnitude than first offset angle 24A, or first offset angle (psi) 24A is positive and second offset angle (psi) 24B is negative but first offset angle 24A is larger in magnitude than second offset angle 24B. Similarly assuming a negative effective offset angle (psi) 24 is more stable for operation in reverse direction 26, CVT 300 may be configured for operation in reverse direction 26 with each of first offset angle (psi) 24A and second offset angle (psi) 24B having any angle such that effective offset angle (psi) 24 is negative, including combinations in which first offset angle (psi) 24A and second offset angle (psi) 24B are both negative, first offset angle (psi) 24A is positive and second offset angle (psi) 24B is negative and greater in magnitude than first offset angle (psi) 24A or first offset angle (psi) 24A is negative and second offset angle (psi) 24B is positive but first offset angle (psi) 24A is greater in magnitude than second offset angle (psi) 24B.

Embodiments disclosed herein may be controlled or configured such that only carrier half 310A is rotated, only carrier half 310B is rotated, or both carrier 310A and 310B are rotated to angular position (beta) 29.

If the effective offset angle (psi) 24 is negative but needs to be positive, a controller may determine which offset angle (psi) 24A or 24B is positive and which offset angle (psi) is negative, and changing one or both offset angles (psi) to be positive or changing one offset angle (psi) 24A or 24B to a positive angle such that the effective offset angle (psi) 24 changes from negative to positive. Furthermore, in embodiments depicted in FIGS. 3A-3J, both links 321 are oriented in the same direction (i.e., both trailing planets 108). However, embodiments may also be configured with one link 321 oriented in a forward direction and the other link 321 oriented in a reverse direction. In these configurations, control of CVT 300 results in one link 321 being in tension and the other link 321 being in compression. Control of CVT 300 may involve only adjusting one link 321 of a pair of links.

FIGS. 3A-3J depict side and front partial views of CVT 300, illustrating carrier 310 formed with carrier halves 310A, 310B rotatable about longitudinal axis 15 to angular position (beta) 29 for imparting a skew angle (zeta) 27 on axles 103 to cause an adjustment of a tilt angle of axles 103 and therefore adjust to a target speed ratio of CVT 300 in, underdrive, overdrive configurations and 1:1 ratio, and in forward and reverse configurations.

As depicted in FIGS. 3A-3J, CVT 300 may be configured with links 321 trailing planets 108. However, variations are possible, including embodiments in which links 321 are leading planets and embodiments in which one link 321 is leading and the other link 321 is trailing. Embodiments in which one link 321 is leading and the other link 321 is trailing may avoid situations in which links 321 buckle or bind due to two forces being applied in the same general direction.

CVT 300 comprises planets 108 located between and in contact with traction rings 102, 104 and sun 110. Each planet 108 has a geometric center, with an x-axis, y-axis and z-axis intersecting at a geometric center of planet 108. The geometric centers collectively define pitch circle 12 for the plurality of planets 108. Planets 108 are rotatably coupled to axles 103. Tilting axles 103 to a non-zero tilt angle (gamma) causes contact points between planets 108 and traction rings 102, 104 to change, thereby adjusting a speed ratio of CVT 300.

Axles 103 are rotatably coupled to planets 108 to allow planets 108 to rotate about axes of rotation 106 defined by axles 103. Bearings 107 allow rotation of planets 108 about axles 103. In some embodiments, bearings 107 allow planets 108 to rotate about axles 103 but constrain planets 108 from movement along axles 103.

Links 321 are coupled to axles 103 on either side of planets 108. As depicted in FIGS. 3A-3J, links 321 are coupled to carrier arms 311A, 311B of carrier halves 310A, 310B. Couplings 312 between links 321 and carrier arms 311A, 311B allows for adjustment of offset angle (psi) 24A, 24B of links 321 about axes of rotation 106 when carrier halves 310A, 310B rotate. Couplings 312 between links 321 and carrier arms 311A, 311B may comprise pin 312 movable in slot 313 (as depicted) or some other coupling. Links 321, couplings 312, or carrier arms 311A, 311B may be configured to allow axles 103 to be adjusted in any direction while maintaining planets 108 centered between traction rings 102, 104. In some embodiments, couplings 312 comprise pins formed with arcuate surfaces. In some embodiments, links 321 may be formed as resilient members capable of deflection. In some embodiments, carrier arms 311A, 311B may be formed such that couplings 312 or links 321 are capable of some axial movement. Combinations of these embodiments and other embodiments are possible.

In operation, links 321 may be rotated about axes of rotation 106 to offset angle (psi) 24 and one or more of carrier halves 310A, 310B may be rotated relative to each other to angular position (beta) 29 to impart skew angle (zeta) 27.

FIGS. 3A-3C depict CVT 300 with links 321 coupled to carrier arms 311A, 311B, wherein links 321 coupled to carrier arms 311A are configured at first offset angle (psi) 24A and links 321 coupled to carrier arms 311B are configured at second offset angle (psi) 24B for forward rotation. Carrier halves 310A, 310B are rotated relative to each other to angular position (beta) 29. As depicted in FIGS. 3A-3C, carriers 310A, 310B may be rotated relative to each other such that an angular position (beta) 29 is zero. Skew angle (zeta) 27 applied to axles 103 is zero, tilt angle (gamma) is zero, and power output on one side of CVT 300 equals power input on the opposite side (minus any losses).

FIG. 3D depicts a partial cutaway view of one embodiment of CVT 300 with pins 312 radially positioned in slots 313 of carrier arms 311A, 311B. Links 321 coupled to carrier arms 311A may be configured at first offset angle (psi) 24A and links 321 coupled to carrier arms 311B are configured at second offset angle 24B, whereby CVT 300 has an effective offset angle (psi) 24 for forward rotation. Carrier halves 310A, 310B may be rotated relative to each other to angular position (beta) 29. For each non-zero angular position, axles 103 (and therefore axes of rotation 106) are misaligned from a longitudinal axis of CVT 300, imparting a non-zero skew angle (zeta) 27. Rotation of each planet 108 about a corresponding y-axis results in spin-induced (traction) forces on that planet 108. As these forces are exerted on planets 108, friction and other forces in CVT 300 act to return CVT 300 to a balanced state, causing axles 103 to tilt to non-zero tilt angle (gamma) 28, resulting in CVT 300 operating in underdrive in forward rotation 25.

FIG. 3E depicts a partial cutaway view of one embodiment of CVT 300 with pins 312 radially positioned in slots 313 of carrier arms 311A, 311B. Links 321 coupled to carrier arms 311A are configured at first offset angle (psi) 24A and links 321 coupled to carrier arms 311B are configured at second offset angle 24B, whereby CVT 300 has an effective offset angle (psi) 24 for forward rotation. To adjust speed ratio, carrier halves 310A, 310B may be rotated relative to each other to angular position (beta) 29. For each non-zero angular position, axles 103 (and therefore axes of rotation 106) are misaligned from a longitudinal axis of CVT 300, imparting a non-zero skew angle (zeta) 27. Rotation of each planet 108 about a corresponding y-axis results in spin-induced (traction) forces on that planet 108. As these forces are exerted on planets 108, friction and other forces in CVT 300 act to return CVT 300 to a balanced state, causing axles 103 to tilt to non-zero tilt angle (gamma) 28, resulting in CVT 300 operating in overdrive in forward rotation 25.

FIGS. 3F-3H depict partial side and front views of one embodiment of CVT 300 configured for operating in reverse direction 26 at a 1:1 ratio. Comparing the radial positioning of pins 312 in slots 313 in carrier arms 311A in FIGS. 3A and 3F, pins 312 are positioned radially outward of pitch circle 12 in FIG. 3A such that offset angle (psi) 24A is positive, whereas pins 312 are positioned radially inward of pitch circle 12 in FIG. 3F such that offset angle (psi) 24A is negative. Similarly, comparing the radial positioning of pins 312 in slots 313 in carrier arms 311B in FIGS. 3C and 3H, pins 312 are positioned radially outward of pitch circle 12 in FIG. 3C such that offset angle (psi) 24B is positive, whereas pins 312 are positioned radially inward of pitch circle 12 in FIG. 3H such that offset angle (psi) 24B is negative.

As described above, CVT 300 depicted in FIGS. 3A-3J has links 321 trailing planets 108, and effective offset angle (psi) 24 is positive for operation in forward direction 25 and negative for operation in reverse direction 26. Furthermore, radially outward positioning pins 312 for both links 321 may not be required for operation in forward direction 25, as long as effective offset angle (psi) 24 composed of first offset angle (psi) 24A and second offset angle (psi) 24B is positive. Similarly, radially inward positioning pins 312 for both links 321 may not be required for operation in reverse direction 26, as long as effective offset angle (psi) 24 composed of first offset angle (psi) 24A and second offset angle (psi) 24B is negative.

FIG. 3I depicts a partial cutaway view of one embodiment of CVT 300 with pins 312 radially positioned in slots 313 of carrier arms 311A, 311B. Links 321 coupled to carrier arms 311A are configured at first offset angle (psi) 24A and links 321 coupled to carrier arms 311B are configured at second offset angle (psi) 24B, whereby CVT 300 has an effective offset angle (psi) 24 for reverse rotation. To adjust speed ratio, carrier halves 310A, 310B may be rotated relative to each other to angular position (beta) 29. For each non-zero angular position, axles 103 (and therefore axes of rotation 106) are misaligned from a longitudinal axis of CVT 300, imparting a non-zero skew angle (zeta) 27. Rotation of each planet 108 about a corresponding y-axis results in spin-induced (traction) forces on that planet 108. As these forces are exerted on planets 108, friction and other forces in CVT 300 act to return CVT 300 to a balanced state, causing axles 103 to tilt to non-zero tilt angle (gamma) 28, resulting in CVT 300 operating in underdrive in reverse rotation 26.

FIG. 3J depicts a partial cutaway view of one embodiment of CVT 300 with pins 312 radially positioned in slots 313 of carrier arms 311A, 311B. Links 321 coupled to carrier arms 311A are configured at first offset angle (psi) 24A and links 321 coupled to carrier arms 311B are configured at second offset angle 24B, whereby CVT 300 has an effective offset angle (psi) 24 for reverse rotation. To adjust speed ratio, carrier halves 310A, 310B may be rotated relative to each other to angular position (beta) 29. For each non-zero angular position, axles 103 (and therefore axes of rotation 106) are misaligned from a longitudinal axis of CVT 300, imparting a non-zero skew angle (zeta) 27. Rotation of each planet 108 about a corresponding y-axis results in spin-induced (traction) forces on that planet 108. As these forces are exerted on planets 108, friction and other forces in CVT 300 act to return CVT 300 to a balanced state, causing axles 103 to tilt to non-zero tilt angle (gamma) 28, resulting in CVT 300 operating in overdrive in reverse rotation 26.

In some embodiments, carrier halves 310A, 310B or links 321 may be coupled to one or more actuators (not shown). An actuator may rotate one or both carrier halves 310A, 310B to angular position (beta) 29 to impart non-zero skew angle (zeta) 27 to cause axles 103 to tilt to tilt angle (gamma) 28 to adjust a speed ratio of CVT 300. An actuator may translate pins 312 radially inward or outward to adjust offset angle (psi) 24 to be positive or negative to configure CVT 300 for operation in forward direction 25 or reverse direction 26. An actuator may be actuated manually, such as by a person adjusting a lever or twisting a grip, or an actuator may be controlled electronically, such as by a controller operating a set of instructions and communicatively coupled to an electronic servo, encoder, hydraulic pump, or other form of actuation. An electronic controller may determine if CVT is to be operated in forward direction 25 or reverse direction 26 and adjust offset angle (psi) independently or concurrently with adjusting an angular position (beta), skew angle (zeta) 27 or tilt angle (gamma) 28.

A CVT capable of operation in forward direction and reverse direction is described herein with respect to FIGS. 4A-4O in which axles 103 are coupled to and controlled by a control system with trunnions 420, in which each planet 108 has a corresponding trunnion 420 that is rotatable about a radial axis to induce a (non-zero) skew condition on planet 108 and is further translatable radially to a positive offset angle (psi) 24 or a negative offset angle (psi) 24, wherein CVT 400 is configured for operation in forward rotation 25 or reverse rotation 26 depending on whether offset angle (psi) 24 is positive or negative and whether trunnion 420 leads or trails planet 108. FIGS. 4A-4O depict embodiments in which trunnions 420 trail planets 108 for operation in forward direction 25 and lead planets 108 for operation in reverse direction 26. Variations are possible in which trunnions 420 lead planets 108 in forward direction 25 and trail planets 108 in reverse direction 26.

Rotating trunnion extension 213 rotates center link 422, advancing one link 421 and receding a corresponding link 421. The advancement and recession of links 421 may apply a non-zero skew condition on axles 103 coupled to planets 108. A non-zero skew condition generates unbalanced forces, and the geometry and configuration of CVT 400 causes axles 103 to tilt. Tilting axles 103 to a non-zero tilt angle (gamma) 28 causes contact points between planets 108 and traction rings 102, 104 to change, adjusting a speed ratio of CVT 400.

CVT 400 comprises planets 108 located between and in contact with traction rings 102, 104 and sun 110. Planets 108 are rotatably coupled to axles 103 such that planets 108 rotate about axes of rotation 106 defined by axles 103. If present, bearings 107 allow rotation of planets 108 about axles 103. In some embodiments, bearings 107 allow planets 108 to rotate about axles 103 but constrain planets 108 from axial movement along axles 103.

Planets 108 are fixed axially due to their position between traction rings 102, 104 and traction sun 110, and are controllable due to their coupling via axles 103, links 421, center link 422, trunnion extension 213 and synchronizing ring 212.

Each trunnion 420 comprises trunnion extension 213 coupled to center link 422, which is coupled at each end to a pair of links 421. Trunnion extension 213 comprises a rigid member radially translatable in opening 216 of synchronizing ring 212 and rotatable about axis 22. Center link 422 is rigidly coupled to trunnion extension 213, whereby rotation of trunnion extension 213 rotates center link 422. Each link 421 is coupled to one end of an axle 103 and center link 422, whereby rotation of center link 422 advances a first link 421 and recedes a second link 421.

Trunnions 420 may be formed or configured for selected degrees of freedom between trunnion extensions 213 and planet axles 103. For example, in some embodiments, axles 103 may rotate about their y-axes 22 but are constrained or fixed axially. In these embodiments, a coupling between links 421 and axles 103 may have only one degree of freedom. In other embodiments, spherical joints or other couplings 415 allow multiple degrees of freedom between links 421 and axles 103. In some embodiments, at least one link 421 may be formed as a resilient member to provide at least one additional degree of freedom. In some embodiments, links 421 may be formed with directional resiliency or rigidity, whereby links 421 behave as rigid members relative to a first direction but behave as resilient members in a second direction. For example, when a torque is applied to links 421 relative to their z-axes, links 421 may behave as rigid members. However, when an axial force is applied to links 421, links 421 may behave as resilient members in the axial direction and allow some axial deflection, returning to their original configuration when the force is removed. An advantage to directional resiliency in a control system for CVT 400 may be an increased range of speed ratios or a smaller volume necessary for the control system or CVT 400. For example, if trunnion extension 213, center link 422 and axles 103 are formed as rigid members, rotation of trunnion extension 213 may be limited based on dimensions such as the width of trunnions 420, the width of center link 422, or the effective length of links 421, and rotation or translation of trunnions 420 may exceed tolerances. However, links 421 having resilient properties, coupling 415 allowing multiple degrees of freedom, or other couplings relative to an axial direction may allow a control system for CVT 400 to flex or twist to remain within tolerances, which may extend the ratio range of CVT 400.

Operationally, trunnion extension 213 is rotatable to skew angle (zeta) 27 about radial line 22 to impart a non-zero skew condition on planet axles 103. A non-zero skew condition, along with the geometry and configuration of CVT 400, generate unbalanced forces on planets 108. The generation of forces due to the non-zero skew condition is a function of the rotation of trunnion 213, the length of center link 422, the effective length of links 421, distance 424 between links 421, the length of axles 103, the direction of rotation of CVT 400 or other factors. Unbalanced forces cause axles 103 to adjust toward tilt angle (gamma) 28 corresponding to a force-balanced state and a zero-skew condition.

In addition to rotating trunnion 420s about axes 22 to skew angle (zeta) 27, trunnion extensions 213 may be translated radially inward or outward to rotate trunnions 420 about the z-axes for planets 108 to offset angle (psi) 24, in which offset angle (psi) 24 may be defined as an angle between tangent line 21 and line 23 passing through the intersection of radial line 22 and center plane 14 which bisects center links 422. A magnitude of offset angle (psi) 24 determines the stability and sensitivity for operation in forward direction 25 and reverse direction 26.

To enable control in forward direction 25, trunnion extension 213 may be radially translated to rotate trunnion 420 about z-axis of planets 108 to offset angle (psi) 24. Rotation of trunnions 420 to a positive or negative offset angle (psi) 24 results in a radial position of center links 422 inward or outward of pitch circle 12. Radial positioning of center links 422 outward of pitch circle 12 enables control of CVT 400 in forward rotation 25. Radial positioning of center links 422 inward of pitch circle 12 enables control of CVT 400 in reverse rotation 26.

FIGS. 4A-4C depict partial front and side views of one embodiment of CVT 400 configured with center links 422 translated radially outward relative to pitch circle 12 for forward direction 25 and with trunnion extensions 213 rotated about axes 22 such that skew angle (zeta) 27 is zero, wherein forces are balanced and tilt angle (gamma) 28 is zero, whereby variator 400 is operating at a speed ratio of 1:1 (i.e., a rotational speed of second traction ring 104 is substantially equal to a rotational speed of first traction ring 102 minus any friction losses).

FIGS. 4D-4F depict partial front, side, and back views of one embodiment of CVT 400 configured with center links 422 translated radially outward of pitch circle 12 for operation in a forward direction, and with trunnion extensions 213 rotated about axes 22 to non-zero skew angle (zeta) 27, wherein unbalanced forces (e.g., spin-induced forces) cause axles 103 to adjust to a non-zero tilt angle (gamma) 28, whereby CVT 400 is operating in underdrive in forward direction 25.

FIGS. 4G-4H depict partial front and side views of one embodiment of CVT 400 configured with center links 422 translated radially outward of pitch circle 12 for operation in a forward direction 25, and with trunnion extensions 213 rotated about axes 22 to non-zero skew angle (zeta) 27 to cause axles 103 to adjust to a non-zero tilt angle (gamma) 28, whereby CVT 400 is operating in overdrive.

FIGS. 4I-4K depict partial front and back views of one embodiment of variator 400 configured with center links 422 translated radially inward of pitch circle 12 for operation in a reverse direction 26, and with trunnion extensions 213 rotated about axes 22 to non-zero skew angle (zeta) 27 to cause an adjustment of axles 103 to a non-zero tilt angle (gamma) 28 such that CVT 400 is operating at a 1:1 ratio.

FIGS. 4L-4M depict partial front and back views of one embodiment of CVT 400 configured with center links 422 translated radially inward of pitch circle 12 for operation in a reverse direction 26, and with trunnion extensions 213 rotated about axes 22 to non-zero skew angle (zeta) 27 to cause an adjustment of axles 103 to a non-zero tilt angle (gamma) 28 whereby CVT 400 is operating in underdrive.

FIGS. 4N-4O depict partial front and back views of one embodiment of CVT 400 configured with center links 422 translated radially inward of pitch circle 12 for stable operation in a reverse direction 26, and with trunnion extensions 213 rotated about axes 22 to non-zero skew angle (zeta) 27 to cause an adjustment of axles 103 to a non-zero tilt angle (gamma) 28 whereby CVT 400 is operating in overdrive.

Embodiments disclosed in FIGS. 4A-4O may be controlled manually, such as by a person rotating a hand grip, lever, or other mechanical actuator. Embodiments disclosed in FIGS. 4A-4O may also be controlled electronically, such as by a controller communicatively coupled to one or more actuators (not shown), whereby the controller receives input regarding a target operating condition of CVT 400 and adjusts one or more of skew angle (zeta) 27 and offset angle (psi) 24 to adjust a tilt angle (gamma) 28 of CVT 400 for operation in forward direction 25 or reverse direction 26. The target operating condition may be a target speed ratio, target ratio, output speed or input speed. The controller may determine a direction of operation (e.g., forward direction 25 or reverse direction 26) and adjust offset angle (psi) 24 accordingly. As the magnitude of offset angle (psi) 24 increases, the stability of CVT 400 increases. As the magnitude of offset angle (psi) 24 nears zero, the sensitivity of CVT 400 increases.

As mentioned above, CVTs described herein may be operated in forward and reverse directions, such as by rotating trunnions 220, 320 or 420 about the z-axes of planets 108 to an offset angle (psi) 24 associated with forward direction 25 or reverse direction 26. In addition to enabling control in forward and reverse, embodiments disclosed herein may be configured for more stability or more sensitivity.

Referring to FIGS. 2A-2J, the more radially inward or outward coupling 215 is moved (i.e., a magnitude of an offset angle (psi) is closer to a maximum possible magnitude for psi), the more stable CVT 200 may operate, whereas radial translation of coupling 215 toward a neutral offset angle (psi) 24 (i.e., a magnitude of an offset angle (psi) is closer to zero), the faster CVT 200 may be adjusted.

- In some embodiments, a controller may be configured to determine a target offset angle (psi) based on a target stability or sensitivity. For example, a controller may control CVT by configuring trunnion 220 to a maximum offset angle (psi) for stability and reducing the frequency at which zeta angle is changed. This example may work well in scenarios in which undesirable or unexpected rollback or operation in reverse direction 26 is unlikely to occur. An advantage to this control scheme may be reduced power consumption by an actuator used to adjust a speed ratio of CVT 200.
- In some embodiments, operating CVT 200 with the magnitude of offset angles (psi) 24 always close to zero may be useful in scenarios in which an unexpected or unfavorable rollback or operation in reverse direction 26 may occur. An advantage to this control scheme may be the ability to rapidly switch between operation in forward direction and reverse direction. A controller may be configured with at least two control schemes, wherein one control scheme configures CVT 200 into a stable configuration with higher magnitude offset angles (psi), and a sensitive configuration with the magnitude of offset angles (psi) closer to zero.

Referring to FIGS. 3A-3J, the larger offset angle (psi) 24 to which links 321 are rotated (i.e., a magnitude of an offset angle (psi) is closer to a maximum possible magnitude for psi), the more stable CVT 300 may operate, whereas the smaller offset angle (psi) 24 to which links 321 are rotated (i.e., a magnitude of an offset angle (psi) is closer to zero), the faster CVT 300 may be adjusted for a given skew angle (zeta) 27. A controller may be configured to determine offset angle (psi) based on a target stability or sensitivity.

- In some embodiments, a controller may control CVT by configuring trunnion 320 to a maximum offset angle (psi) 24 for stability and reducing the frequency at which skew angle (zeta) 27 is changed. This example may work well in scenarios in which unfavorable or unexpected rollback or operation in reverse direction 26 is unlikely to occur. An advantage to this control scheme may be reduced power consumption by an actuator used to adjust a speed ratio of CVT 300.
- In some embodiments, operating CVT 300 with the magnitude of offset angles (psi) 24 always close to zero may be useful in scenarios in which an unexpected or unfavorable rollback or operation in reverse direction 26 may occur. An advantage to this control scheme may be the ability to rapidly switch between operation in forward direction and reverse direction.

A controller may be configured with at least two control schemes, wherein one control scheme configures CVT 300 into a stable configuration with higher magnitude offset angles (psi), and a sensitive configuration with the magnitude of offset angles (psi) closer to zero. In some embodiments, an offset angle (psi) greater than 10 degrees may provide a stable configuration. In some embodiments, an offset angle (psi) greater than 12 degrees may provide a stable configuration. In some embodiments, an offset angle (psi) greater than 15 degrees may provide a stable configuration. In some embodiments, an offset angle (psi) less than 10 degrees may provide a sensitive configuration. In some embodiments, an offset angle (psi) less than 7 degrees may provide a sensitive configuration. In some embodiments, an offset angle (psi) less than 5 degrees may provide a sensitive configuration.

A controller may be coupled to a user interface and a plurality of sensors. User inputs may be received by the controller from the user interface. A user input may include a target speed ratio, a direction of rotation, a control scheme, or some combination. In some embodiments, a user input may be interpreted by the controller. For example, a user may select “Economy” and “Forward” and the controller may interpret the user input to configure a CVT with a positive, larger magnitude offset angle (psi) 24 for stable control in forward rotation, or a user may select “Low” and “Forward” and the controller may recognize that operation in this combination may be an indicator that rollback is likely and configure a CVT with a positive, lower magnitude offset angle (psi).

Referring to FIGS. 4A-4O, the more radially inward or outward that center links 422 are positioned (i.e., the larger offset angle (psi) 24 to which links 421 are rotated such that a magnitude of an offset angle (psi) is closer to a maximum possible magnitude), the more stable CVT 400 may operate, whereas the closer to pitch circle 12 that center links 422 are positioned, the faster CVT 400 may be adjusted for a given skew angle (zeta) 27.

- In some embodiments, a controller may be configured to determine offset angle (psi) 24 based on a target stability or sensitivity. For example, a controller may control CVT 400 by positioning center links 422 to configure CVT 400 with a maximum offset angle (psi) 24 for stability and reducing the frequency at which skew angle (zeta) 27 is changed. This example may work well in scenarios in which undesirable or unexpected rollback or operation in reverse direction 26 is unlikely to occur. An advantage to this control scheme may be reduced power consumption by an actuator used to adjust a speed ratio of CVT 400.
- In some embodiments, operating CVT 400 with the magnitude of offset angle (psi) 24 always close to zero may be useful in scenarios in which an unexpected or unfavorable rollback or operation in reverse direction 26 may occur. An advantage to this control scheme may be the ability to rapidly switch between operation in forward direction and reverse direction. A controller may be configured with at least two control schemes, wherein one control scheme configures CVT 400 into a stable configuration with higher magnitude offset angles (psi), and a sensitive configuration with the magnitude of offset angles (psi) closer to zero.

As described herein, planets 108 may be in contact with traction rings 102, 104 and sun 110. Contact may be direct or may include embodiments in which a traction fluid between contact points allows CVT 200, 300 or 400 to behave as if there is direct contact between components.

Operation in reverse direction 26, as described herein, may refer to powered and unpowered events in which a CVT is rotated in a direction opposite a design direction.

Embodiments disclosed herein may include a controller executing a set of instructions for a control process. As used herein, the term “shutdown” refers to a process or sequence in which power is removed from all electronic components. Shutdown may therefore include removing power from an electronic control unit (ECU), user displays, and the like, and may also include removing power from actuators, hydraulic and lubrication pumps, fans and other auxiliary and accessory devices.

A control process may include a controller tracking speed ratio, which may involve the controller tracking tilt angle (gamma) 28. Referring to embodiments of CVT 200, 300 or 400, in some embodiments, a controller may track speed ratio based on skew angle (zeta) 27. In some embodiments, a controller may track speed ratio relative to distance D that ring 212 is translated axially in CVT 200. In some embodiments, a controller corresponding to CVT 300 may track speed ratio based on a relative angular position (beta) of carrier halves 310A, 310B. In some embodiments, a controller corresponding to CVT 400 may track speed ratio based on skew angle (zeta) 27 of trunnion extensions 213. Variations in CVT geometry and components will allow for other ways to track speed ratio directly or indirectly. In some embodiments, tracking speed ratio using direct or indirect measurements may be performed once reverse speed is detected, and a controller may remain on an upshift (forward adjustment) side of the tracked speed ratio.

Examples of operation in reverse direction include the following scenarios:

In this scenario, vehicle speed is zero prior to shutdown, the prime mover is turned off, the controller is powered down, a range box (if part of the drivetrain) is in gear (forward or reverse), and the vehicle rolls in a direction opposite of the gear range selection. An example of this scenario occurs when a vehicle is stopped in a gear range on flat ground and powered off, but the vehicle is pushed or pulled in an opposite direction of the range. The controller is powered down, so downshift cannot be tracked as the vehicle rolls back and the CVT may lock if the planet axles translate into certain configurations. A control process may include the controller sensing when the vehicle stops (or is about to stop). The controller may impart a skew angle (zeta) to cause a slight upshift to the speed ratio before the controller is powered down, or the controller may, upon receiving a signal to power down, impart a skew angle (zeta) to cause a slight upshift to the speed ratio. In some embodiments, when the controller identifies a condition or set of conditions that may possibly result in a rollback situation, the controller may execute a set of instructions that result in a control system operating with a magnitude of an offset angle (psi) being closer to zero and with higher frequency data sampling. The magnitude of the offset angle (psi) may be greater than 3 degrees but less than 10 degrees, less than 5 degrees, or some other angle or range of angles that allows control of the CVT and is able to switch directions if needed.

In this scenario, vehicle speed is zero prior to shutdown, the prime mover is turned off, the controller is powered down, a range box (if part of the drivetrain) is in gear (forward or reverse), and the vehicle rolls in opposite direction of range selection. An example is if the vehicle stalls when traversing a hill and subsequently rolls backward. This scenario might be more common than the standard shutdown since there might not be enough time to adjust the transmission to underdrive. A challenge is that a tilt angle of the planet axles might not be tracked as the vehicle rolls back and the CVT may lock if the planet axles translate into certain configurations. A control process may include the controller sensing when the vehicle stalls (or is about to stall) and imparting a skew angle (zeta) to cause a slight upshift to the speed ratio before the controller powers down or changing an offset angle (psi) to, or the controller, upon receiving a signal indicating the engine has stalled and the controller is about to power down, imparting a skew angle (zeta) to cause a slight upshift to the speed ratio. In some embodiments, when the controller identifies a condition or set of conditions that are likely to result in a rollback situation, the controller may execute a set of instructions that result in a control system operating with a magnitude of an offset angle (psi) being closer to zero and with higher frequency data sampling. The magnitude of the offset angle (psi) may be greater than 3 degrees but less than 7 degrees, less than 5 degrees, or some other angle or range of angles that allows control of the CVT and is able to switch directions if needed.

In this scenario, the vehicle speed may be zero, with the prime mover speed below a clutch engagement point, such that even with a range box in gear (either forward or reverse), the vehicle rolls in the opposite direction of range selection. An example of this scenario is when a driver stops on a slope and releases the brake before either applying sufficient throttle to go forward or engaging a parking brake to prevent the vehicle from rolling backward. There may be different control processes, depending on the circumstances. The controller performs a control process to adjust a CVT to a slight upshift (forward adjustment) when the vehicle stops. If the vehicle is equipped with accelerometers or other sensors that allow the vehicle to detect slopes, a control process performs a slight upshift when a vehicle comes to a stop and a controller has determined that the vehicle is on a slope. Once reverse speed is detected, a controller may ensure a CVT remains on an upshift side of a target speed ratio. In some embodiments, when the controller identifies a condition or set of conditions that indicate a rollback situation, the controller may execute a set of instructions that result in a control system changing a sign of the offset angle (psi), operating with a magnitude of an offset angle (psi) being closer to zero, and with higher frequency data sampling. The magnitude of the offset angle (psi) may be greater than 3 degrees but less than 10 degrees, less than 5 degrees, or some other angle or range of angles that allows control of the CVT and is able to switch directions if needed.

In this scenario, the vehicle speed is zero, the prime mover speed is above a clutch engagement point, but the clutch is slipping and not transmitting torque to the drivetrain, the range box is in gear (forward or reverse) but the vehicle rolls in an opposite direction of the range selection. This may be due to the slope, towing, pushing, or some other external factor. This scenario may occur when a vehicle is on a steeper grade and the driver remains on the throttle but not enough to overcome the grade. In some embodiments, the controller executes instructions in a control process to adjust a CVT to a slight upshift (perform a forward adjustment) when the vehicle speed reaches zero. In some embodiments, tracking speed ratio using direct or indirect measurements may be performed once reverse speed is detected, and a controller may remain on an upshift (forward adjustment) side of the tracked speed ratio. A challenge with this scenario or control process is that timing of an upshift may be critical, as the timing between when wheel speed is zero and rollback begins may be very short. In some embodiments, when the controller identifies a condition or set of conditions that indicate a powered rollback situation, the controller may execute a set of instructions that result in a control system changing an offset angle (psi) of the CVT, operating with a magnitude of an offset angle (psi) closer to zero, changing the skew angle (zeta) to keep the CVT operating in a target range (overdrive or underdrive), and increasing the rate of frequency data sampling. Using CVT 200 depicted in FIGS. 2A-2J as an example, if CVT 200 is operating in overdrive in a forward direction (such as depicted in FIG. 2E) and encounters a powered rollback situation, a controller may execute a set of instructions to restrict the magnitude of the offset angle (psi) to be greater than 3 degrees but less than 10 degrees and ring 212 may be axially translated from a position near first traction ring 102 to a position near second traction ring 104 to keep CVT 200 in overdrive (as depicted in FIG. 21), or an axial position of ring 212 may be maintained to switch operation of CVT 200 from overdrive to underdrive (as depicted in FIG. 2J). The CVT may be operated at some other angle or range of angles that allows control of the CVT and is able to switch directions if needed.

In this scenario, the vehicle speed is non-zero and the range box is in gear. There may be a fast transition from throttle to brake, the prime mover speed may remain high and the clutch may be engaged. Furthermore, the brakes may be applied hard, inducing wheel lock. This scenario may occur, for example, when there is an emergency stop on a slope, and the driver then releases the brake before reapplying the throttle or engaging a parking brake, or may occur if there is an emergency stop on flat ground but is then pushed or towed in an opposite direction. In some embodiments, a controller executes a set of instructions in a control process to downshift the CVT rapidly to avoid stalling the engine, such that power is constantly applied to the CVT controller. A control process may include the controller slightly upshifting (forward adjustment) a speed ratio of the CVT as the wheel speed nears zero. In some embodiments, once reverse speed is detected, the controller may execute a set of instructions to keep a CVT on an upshift (forward adjustment) of a target speed ratio. A challenge may be to the difficulty in smoothly tracking a relationship between wheel and engine speed at high wheel deceleration rates. A challenge is that rollback may be more likely when the throttle is reengaged if the CVT is not fully downshifted.

In this scenario, the vehicle speed is non-zero and the range box is in gear. The wheels lose traction and spin, so the transmission upshifts (adjusts forward). The vehicle may slow to a stop and the driver releases the throttle, so the prime mover is at idle and the clutch is open. The vehicle may roll in the opposite direction of range selection. This scenario may occur, for example, if the vehicle is climbing a hill of loose material, there is loss of traction, and the driver releases the throttle. The controller performs a control process to increase a speed ratio of the CVT when the wheels break loose. The controller may also perform a control process to slightly increase the speed ratio of the CVT when the wheel speed reaches zero. A control process may include tracking a ratio (or track a corresponding parameter such as tilt angle (gamma) 28) with beta angle 29, remaining in an upshift side of present speed ratio. A challenge with existing CVTs includes the difficulty in smoothly tracking a relationship between wheel speed and engine speed at high wheel acceleration rates. Also, in some prior approaches, tilt angle (gamma) 28 must be tracked through a full ratio sweep. Embodiments disclosed herein may mitigate this challenge by allowing a controller to execute a control process that is able to independently adjust speed ratio and offset angle, such that the CVT may be adjusted quickly for a wide range of conditions. If the transmission is already at the highest speed ratio, further increases are not possible and a controller may execute a set of instructions to maintain a maximum skew angle (zeta) and the rate of data sampling may decrease.

In this scenario, the vehicle speed is non-zero and the range box is in gear. The wheels lose traction and spin, so the speed ratio of a CVT increases. The vehicle may slow but then regain traction, so the driver remains on the throttle and the input clutch experiences slipping. The vehicle may roll in the opposite direction of range selection. This scenario may occur, for example, if the vehicle is climbing a loose hill, there is loss of traction, but the driver remains on the throttle and traction is regained. A control process may be a rapid increase of speed ratio when the wheels break loose. A control process for a CVT may include increasing a skew angle (zeta) to cause a slight upshift when the wheel speed reaches zero. In some embodiments, a controller may track a speed ratio and adjust the skew angle (zeta) to remain in upshift side of a target speed ratio. Tracking a relationship between wheel speed and engine speed at high wheel acceleration rates may be difficult, rollback may be more likely due to an upshift prior to stalling, and tilt angle (gamma) must be tracked through a full ratio sweep. Embodiments disclosed herein may mitigate this challenge by allowing a controller to execute a control process that is able to independently adjust speed ratio and offset angle, such that the CVT may be adjusted quickly for a wide range of conditions. If the transmission is already fully upshifted to full overdrive, further upshifting to enable rollback is not possible. Embodiments disclosed herein may address operation in reverse direction—including rollback—of continuously variable transmissions. Embodiments described herein may be particularly useful for controlling CVTs by imparting a skew angle (zeta) on a plurality of planets to control a transmission ratio.

A drivetrain may include a prime mover, a CVT, and a control system. A prime mover generates power. Power may be delivered at a constant speed level or at varying (including modulating) speed levels, which depend on, among other things, user inputs or output power. A planetary gear set allows a drive train having a CVT to operate in various modes. By selectively locking or unlocking one or more of a sun gear, a set of planet gears, or a ring gear, the drive train can operate in various modes including, but not limited to, low mode, high mode, forward mode, or reverse mode. For example, power may be input through the sun gear, and by locking a ring gear, power exits the set of planet gears, but in a reverse direction. A control system receives signals indicating operating conditions for one or more of the prime mover, clutches, a planetary gear set, a CVT and a differential, and sends control signals to one or more of the prime mover, the clutches, the planetary gear set and the CVT. The control signals ensure a target performance of the drivetrain. In some embodiments, signals indicating operating conditions of a prime mover are not received. However, in other embodiments, signals indicating operating conditions of a prime mover are received, allowing embodiments to take advantage of the capabilities of a CVT and optimize performance of the prime mover as well as the performance of an auxiliary device or accessory on a vehicle. A control system for a CVT employing a plurality of tiltable balls may receive signals indicating a target direction of rotation and an actual direction of rotation. Signals indicating a target direction of rotation may include user inputs, signals from an accelerometer, throttle or other vehicle sensor, signals from a global positioning system (GPS) or other external source, including combinations thereof. Signals indicating an actual direction of rotation may include signals from accelerometers or similar systems indicating relative movement, signals from pickups or other sensors directly sensing (or measuring) parameters of internal components, or environmental sensors capable of determining motion of a vehicle based on changes in the surroundings. In some embodiments, the control system is configured to determine an unintended change in the direction of rotation based on an indication of brake pressure or an increase in brake pressure and/or reduced vehicle speed or a vehicle speed below a predetermined threshold. The threshold may be constant or may vary according to several factors, including but not limited to, a load, a pitch angle, a roll angle, wheel speed, vehicle speed, hydraulic pressure, brake pressure, or some other factor or combination of factors. For example, if the wheel speed is low relative to vehicle speed, embodiments may determine the vehicle is slipping, or high brake pressure in combination with any non-zero vehicle speed may determine the vehicle operator is trying to stop the vehicle. Hydraulic pressure may indicate a load. A pitch angle and a roll angle (and the combination) are examples of factors that might help determine conditions in which rollback is more likely to occur. A control system may be configured to determine an unintended change in the direction of rotation based on a comparison of engine speed and vehicle speed, including acceleration (a rate of change of vehicle speed). For example, a controller may receive signals from an engine speed sensor indicating the engine is operating at an increased speed and a vehicle speed sensor indicating the vehicle speed is decreasing. This comparison may indicate the wheels are slipping. The controller may then perform any processes necessary to counteract the effects of operation in reverse direction of a CVT. For example, in some embodiments, a control system is configured to impart an additional skew condition to each planet. In some embodiments, a control system is configured to send an indication to increase throttle of the prime mover. Other signals and indicators may be used to determine when operation in reverse direction is possible or likely. For example, in some embodiments, a control system is configured to determine if a clutch is slipping, if the vehicle is on a slope likely to result in the vehicle stalling.

In operation, a prime mover generates power having an associated torque and speed. Power may be transmitted directly to the CVT, such as by a direct coupling the prime mover to the CVT, or indirectly through an element such as a shaft, sprocket, chain, belt, pulley or planetary gear set to the CVT. Power from the CVT may be transmitted either directly or indirectly to a downstream gear set. A gear set may be configured for an output torque or speed. For example, power may enter a planetary gear set via an outer ring but may exit the planetary gear set via a sun gear. Alternatively, a planetary gear set may be configured to allow power to enter via a carrier, a sun gear, a planet gear or some combination. Similarly, a planetary gear set may be configured to allow power to exit the planetary gear set via the outer ring, the planet gears, the carrier, the sun gear, or some combination. A control system receives signals related to the operation of the prime mover or CVT and optimizes one or more of the prime mover operation or the CVT operation based on a target output parameter or operating condition. For example, a result may be based on efficiency or acceleration (power transfer).

Embodiments disclosed herein may provide additional advantages. For example, embodiments disclosed with respect to CVT 200 and 400 are free from side components, which may allow for better circulation of lubrication using unpowered techniques (e.g., “splash lubrication”), whereas embodiments disclosed with respect to CVT 300 may include lubrication channels, ports, or other fluid delivery systems in carriers 310A, 310B for powered or directed lubrication.

Embodiments disclosed herein are exemplary. Other modifications may be possible that are still within the scope of the disclosure. For example, FIGS. 2A-2J depict embodiments in which axles 103 are axially fixed to planets 108 and planets 108 are axially fixed by other components including first traction ring 102, second traction ring 104, and sun 110 such that tilting planets 108 is accomplished by an axial translation of trunnion extensions 215.

A variation of an embodiment of FIGS. 2A-2J is also described in which trunnion extensions 215 are axially fixed, and axles 103 are axially translatable relative to planets 108 to tilt planets 108. A person of skill in the art will appreciate, after reading this disclosure, that a variation may be possible in which a third point is located along the line AB between point A (the intersection of axis of rotation 106 and a midplane of axles 103) and point B (a geometric center of couplings 215) in which axles 103 may be translated axially in a first direction and couplings 215 may be translated axially in an opposite direction to cause planets 108 to tilt, wherein the distance that point A and point B are translated depend on the location of the third point on line AB.

As another example of variations possible within the scope of the disclosed technology, FIGS. 3A-3J depict one embodiment in which links 321 are coupled between axles 103 and carrier arms 311 via pins or other couplings 312. Rotation of carriers 310A, 310B to adjust carrier arms 311 may require multiple degrees of freedom. Pins 312 are depicted in slots 313. Pins may be spherical or have some other arcuate surface to provide multiple degrees of freedom. Links 321 may also provide one or more degrees of freedom. Other configurations and materials may provide other degrees of freedom, may improve degrees of freedom, may provide directional degrees of freedom. In FIGS. 3A-3J, carrier arms 311A, 311B are depicted generally as radial spokes. However, in some embodiments, carrier arms 311A, 311B may be curved (in an axial, radial or angular direction), angled, or otherwise configured to provide degrees of freedom.

As used herein, the terms “comprises,” “comprising,” “includes,” “including,” “has,” “having” or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a process, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus.

Further, unless expressly stated to the contrary, “or” refers to an inclusive or and not to an exclusive or. That is, the term “or” as used herein is generally intended to mean “and/or” unless otherwise indicated. For example, a condition A or B is satisfied by any one of the following: A is true (or present) and B is false (or not present), A is false (or not present) and B is true (or present), and both A and B are true (or present).

As used herein, a term preceded by “a” or “an” (and “the” when antecedent basis is “a” or “an”) includes both singular and plural of such term unless the context clearly dictates otherwise. Also, as used herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.

Additionally, any examples or illustrations given herein are not to be regarded in any way as restrictions on, limits to, or express definitions of, any term or terms with which they are utilized. Instead, these examples or illustrations are to be regarded as being described with respect to one particular embodiment and as illustrative only. Those of ordinary skill in the art will appreciate that any term or terms with which these examples or illustrations are utilized will encompass other embodiments that may or may not be given therewith or elsewhere in the specification and all such embodiments are intended to be included within the scope of that term or those terms.

Reference throughout this specification to “one embodiment,” “an embodiment,” or “a specific embodiment” or similar terminology means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment and may not necessarily be present in all embodiments. Thus, respective appearances of the phrases “in one embodiment,” or “in an embodiment,” or similar terminology in various places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics of any particular embodiment may be combined in any suitable manner with one or more other embodiments. It is to be understood that other variations and modifications of the embodiments described and illustrated herein are possible in light of the teachings herein and are to be considered as part of the spirit and scope of the disclosed technology.

Although the disclosed technology has been described with respect to specific embodiments thereof, these embodiments are merely illustrative, and not restrictive of the disclosed technology. The description herein of illustrated embodiments of the disclosed technology is not intended to be exhaustive or to limit the disclosed technology to the precise forms disclosed herein (and in particular, the inclusion of any particular embodiment, feature or function is not intended to limit the scope of the disclosed technology to such embodiment, feature or function). Rather, the description is intended to describe illustrative embodiments, features and functions in order to provide a person of ordinary skill in the art context to understand the disclosed technology without limiting the disclosed technology to any particularly described embodiment, feature or function. While specific embodiments of, and examples for, the disclosed technology are described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the disclosed technology, as those skilled in the relevant art will recognize and appreciate. As indicated, these modifications may be made to the disclosed technology in light of the foregoing description of illustrated embodiments of the disclosed technology and are to be included within the spirit and scope of the disclosed technology. Thus, while the disclosed technology has been described herein with reference to particular embodiments thereof, a latitude of modification, various changes and substitutions are intended in the foregoing disclosures, and it will be appreciated that in some instances some features of embodiments of the disclosed technology will be employed without a corresponding use of other features without departing from the scope and spirit of the disclosed technology as set forth. Therefore, many modifications may be made to adapt a particular situation or material to the essential scope and spirit of the disclosed technology.

In the description herein, numerous specific details are provided, such as examples of components and/or methods, to provide a thorough understanding of embodiments of the disclosed technology. One skilled in the relevant art will recognize, however, that an embodiment may be able to be practiced without one or more of the specific details, or with other apparatus, systems, assemblies, methods, components, materials, parts, and/or the like. In other instances, well-known structures, components, systems, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the disclosed technology. While the disclosed technology may be illustrated by using a particular embodiment, this is not and does not limit the disclosed technology to any particular embodiment and a person of ordinary skill in the art will recognize that additional embodiments are readily understandable and are a part of this disclosed technology.

Although the steps, operations, or computations may be presented in a specific order, this order may be changed in different embodiments. In some embodiments, to the extent multiple steps are shown as sequential in this specification, some combination of such steps in alternative embodiments may be performed at the same time. The sequence of operations described herein can be interrupted, suspended, or otherwise controlled by another process.

It will also be appreciated that one or more of the elements depicted in the drawings/figures can also be implemented in a more separated or integrated manner, or even removed or rendered as inoperable in certain cases, as is useful in accordance with a particular application. Additionally, any signal arrows in the drawings/figures should be considered only as exemplary, and not limiting, unless otherwise specifically noted.

Claims

1. A continuously variable transmission (CVT) having a central axis, the CVT comprising: first and second traction rings rotatable about the central axis;a sun rotatable about the central axis;a plurality of planet assemblies configured to transfer power between the first and second traction rings, each planet assembly coupled to the first and second traction rings and the sun, each planet assembly comprising a planet rotatable about a planet axle, the planet axle defining an axis of rotation of the planet, each planet axle capable of being skewed to form a skew angle in a first direction between the central axis and the planet axle and of tilting to form a tilt angle in a second direction between the central axis and the planet axle, the tilt angle defining a transmission ratio of the CVT;a first carrier half coaxial with and at least partially rotatable about the central axis, the first carrier half coupled by a plurality of first links to a first end of each of the planet axles;a second carrier half coaxial with and at least partially rotatable about the central axis, the second carrier half coupled by a plurality of second links to a second end of each of the planet axles, the first carrier half and second carrier half being rotatable with respect to each other to define an angular position, the first carrier half and the second carrier half being limited in relative rotation with respect to each other to a maximum angular position, a non-zero angular position of the relative rotation of the first and second carrier halves imparting a non-zero skew angle on each of the planet axles, the non-zero skew angle imparting an adjustment to the tilt angle of each of the planet axles, thereby resulting in a change in the transmission ratio of the CVT;a plurality of first couplings configured to couple the plurality of first links to the first carrier half; anda plurality of second couplings configured to couple the plurality of second links to the second carrier half, the plurality of first and second couplings configured to allow the plurality of first and second links to rotate out of plane with the first and second carrier halves to facilitate tilting of the planet axles.
2. The CVT of claim 1, wherein the plurality of first and second couplings comprise ball joints.
3. The CVT of claim 1, wherein the plurality of first and second links are flexible.
4. The CVT of claim 1, further comprising: a pitch circle coaxial about the central axis and having a radius equal to a plurality of centers of the planet assemblies; anda plurality of first and second connections configured to connect the plurality of first and second links to the plurality of planet axles, an effective offset angle defined by a tangent of the pitch circle at a respective one of the plurality of first and second connections and a line between an associated one of the plurality of first and second connections and an associated one of the plurality of first and second couplings, the effective offset angle being positive when the plurality of first and second links are located radially outside of the pitch circle, a positive offset angle associated with a forward direction of rotation, and the effective offset angle being negative when the plurality of first and second links are located radially inside of the pitch circle, a negative offset angle associated with a reverse direction of rotation.
5. The CVT of claim 4, further comprising an actuator configured to adjust the radial position of the plurality of first and second couplings in order to adjust the effective offset angle.
6. The CVT of claim 5, wherein the actuator is configured to adjust the radial position of the plurality of first and second couplings to a positive effective offset angle when the CVT is rotating in the forward direction of rotation, and wherein the actuator is configured to adjust the radial position of the plurality of first and second couplings to a negative offset angle when the CVT is rotating in the reverse direction of rotation.

CROSS REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. Nonprovisional Application Ser. No. 16/799,025, filed Feb. 24, 2020, now U.S. Pat. No. 11,174,922, which claims the benefit of U.S. Provisional Application No. 62/810,832, filed Feb. 26, 2019, which are hereby incorporated by reference in their entirety.

US Referenced Citations (1044)

Number	Name	Date	Kind
225933	Kellogg	Mar 1880	A
719595	Huss	Feb 1903	A
721663	Brooke	Mar 1903	A
1121210	Hans	Dec 1914	A
1175677	Barnes	Mar 1916	A
1207985	Null	Dec 1916	A
1380006	Nielsen	May 1921	A
1390971	Samain	Sep 1921	A
1558222	Beetow	Oct 1925	A
1629092	Crockett	May 1927	A
1629902	Arter	May 1927	A
1686446	Gilman	Oct 1928	A
1774254	Daukus	Aug 1930	A
1793571	Vaughn	Feb 1931	A
1847027	Thomsen	Feb 1932	A
1850189	Weiss	Mar 1932	A
1858696	Weiss	May 1932	A
1865102	Hayes	Jun 1932	A
1903228	Thomson	Mar 1933	A
1947044	Gove	Feb 1934	A
1978439	Sharpe	Oct 1934	A
2030203	Gove	Feb 1936	A
2060884	Madle	Nov 1936	A
2086491	Dodge	Jul 1937	A
2097631	Madle	Nov 1937	A
2100629	Chilton	Nov 1937	A
2109845	Madle	Mar 1938	A
2112763	Cloudsley	Mar 1938	A
2123008	Hayes	Jul 1938	A
2131158	Almen	Sep 1938	A
2134225	Christiansen	Oct 1938	A
2152796	Erban	Apr 1939	A
2196064	Erban	Apr 1940	A
2209254	Ahnger	Jul 1940	A
2259933	Holloway	Oct 1941	A
2269434	Brooks	Jan 1942	A
2325502	Georges	Jul 1943	A
RE22761	Wemp	May 1946	E
2461258	Brooks	Feb 1949	A
2469653	Kopp	May 1949	A
2480968	Ronai	Sep 1949	A
2553465	Barthelemy	May 1951	A
2563370	Reese	Aug 1951	A
2586725	Schottler	Feb 1952	A
2595367	Picanol	May 1952	A
2596538	Dicke	May 1952	A
2597849	Uno	May 1952	A
2675713	Acker	Apr 1954	A
2696888	Chillson	Dec 1954	A
2716357	Rennerfelt	Aug 1955	A
2730904	Rennerfelt	Jan 1956	A
2748614	Weisel	Jun 1956	A
2868038	Billeter	Jan 1959	A
2873911	Perrine	Feb 1959	A
2874592	Oehrli	Feb 1959	A
2883883	Chillson	Apr 1959	A
2891213	Kern	Jun 1959	A
2901924	Banker	Sep 1959	A
2913932	Oehrli	Nov 1959	A
2931234	Hayward	Apr 1960	A
2931235	Hayward	Apr 1960	A
2949800	Neuschotz	Aug 1960	A
2959063	De Brie Perry	Nov 1960	A
2959070	Flinn	Nov 1960	A
2959972	Madson	Nov 1960	A
2964959	Beck	Dec 1960	A
2982154	Zapletal	May 1961	A
3008061	Mims	Nov 1961	A
3028778	Hayward	Apr 1962	A
3035460	Guichard	May 1962	A
3048056	Wolfram	Aug 1962	A
3051020	Hartupee	Aug 1962	A
3081641	Iseman	Mar 1963	A
3086704	Hurtt	Apr 1963	A
3087348	Kraus	Apr 1963	A
3088704	Grady	May 1963	A
3154957	Kashihara	Nov 1964	A
3163050	Kraus	Dec 1964	A
3176542	Werner	Apr 1965	A
3184983	Kraus	May 1965	A
3204476	Rouverol	Sep 1965	A
3207248	Strom	Sep 1965	A
3209606	Yamamoto	Oct 1965	A
3211364	Wentling	Oct 1965	A
3216283	General	Nov 1965	A
3229538	Schottler	Jan 1966	A
3237468	Schottler	Mar 1966	A
3246531	Kashihara	Apr 1966	A
3248960	Schottler	May 1966	A
3273468	Allen	Sep 1966	A
3277745	Harned	Oct 1966	A
3280646	Lemieux	Oct 1966	A
3283614	Hewko	Nov 1966	A
3292443	Perruca	Dec 1966	A
3340895	Osgood, Jr.	Sep 1967	A
3407687	Hayashi	Oct 1968	A
3413896	Wildhaber	Dec 1968	A
3430504	Dickenbrock	Mar 1969	A
3439563	Petty	Apr 1969	A
3440895	Fellows	Apr 1969	A
3464281	Hiroshi	Sep 1969	A
3477315	Macks	Nov 1969	A
3487726	Burnett	Jan 1970	A
3487727	Gustafsson	Jan 1970	A
3574289	Shelter	Apr 1971	A
3581587	Dickenbrock	Jun 1971	A
3661404	Bossaer	May 1972	A
3695120	Titt	Oct 1972	A
3707888	Schottler	Jan 1973	A
3727473	Bayer	Apr 1973	A
3727474	Fullerton	Apr 1973	A
3736803	Horowitz	Jun 1973	A
3743063	Blechschmidt	Jul 1973	A
3745844	Schottler	Jul 1973	A
3768715	Tout	Oct 1973	A
3769849	Hagen	Nov 1973	A
3800607	Zurcher	Apr 1974	A
3802284	Sharpe	Apr 1974	A
3810398	Kraus	May 1974	A
3820416	Kraus	Jun 1974	A
3866985	Whitehurst	Feb 1975	A
3891235	Shelly	Jun 1975	A
3934493	Hillyer	Jan 1976	A
3954282	Hege	May 1976	A
3984129	Hege	Oct 1976	A
3987681	Keithley	Oct 1976	A
3996807	Adams	Dec 1976	A
4023442	Woods	May 1977	A
4098146	McLarty	Jul 1978	A
4103514	Grosse-Entrup	Aug 1978	A
4159653	Koivunen	Jul 1979	A
4169609	Zampedro	Oct 1979	A
4177683	Moses	Dec 1979	A
4227712	Dick	Oct 1980	A
4314485	Adams	Feb 1982	A
4345486	Olesen	Aug 1982	A
4369667	Kemper	Jan 1983	A
4382186	Denholm	May 1983	A
4382188	Cronin	May 1983	A
4391156	Tibbals, Jr.	Jul 1983	A
4456233	Mueller	Jun 1984	A
4459873	Black	Jul 1984	A
4464952	Stubbs	Aug 1984	A
4468984	Castelli	Sep 1984	A
4494524	Wagner	Jan 1985	A
4496051	Ortner	Jan 1985	A
4501172	Kraus	Feb 1985	A
4515040	Takeuchi	May 1985	A
4526255	Hennessey	Jul 1985	A
4546673	Shigematsu	Oct 1985	A
4560369	Hattori	Dec 1985	A
4567781	Russ	Feb 1986	A
4569670	McIntosh	Feb 1986	A
4574649	Seol	Mar 1986	A
4585429	Marier	Apr 1986	A
4592247	Mutschler	Jun 1986	A
4617838	Anderson	Oct 1986	A
4628766	de Brie Perry	Dec 1986	A
4630839	Seol	Dec 1986	A
4631469	Tsuboi	Dec 1986	A
4643048	Hattori	Feb 1987	A
4651082	Kaneyuki	Mar 1987	A
4663990	Itoh	May 1987	A
4667525	Schottler	May 1987	A
4700581	Tibbals, Jr.	Oct 1987	A
4706518	Moroto	Nov 1987	A
4713976	Wilkes	Dec 1987	A
4717368	Yamaguchi	Jan 1988	A
4735430	Tomkinson	Apr 1988	A
4738164	Kaneyuki	Apr 1988	A
4744261	Jacobson	May 1988	A
4756211	Fellows	Jul 1988	A
4781663	Reswick	Nov 1988	A
4838122	Takamiya	Jun 1989	A
4856374	Kreuzer	Aug 1989	A
4857035	Anderson	Aug 1989	A
4869130	Wiecko	Sep 1989	A
4881925	Hattori	Nov 1989	A
4884473	Lew	Dec 1989	A
4900046	Aranceta-Angoitia	Feb 1990	A
4909101	Terry, Sr.	Mar 1990	A
4918344	Chikamori	Apr 1990	A
4961477	Sweeney	Oct 1990	A
4964312	Kraus	Oct 1990	A
4976170	Hayashi	Dec 1990	A
5006093	Itoh	Apr 1991	A
5020384	Kraus	Jun 1991	A
5025685	Kobayashi	Jun 1991	A
5033322	Nakano	Jul 1991	A
5033571	Morimoto	Jul 1991	A
5037361	Takahashi	Aug 1991	A
5044214	Barber, Jr.	Sep 1991	A
5059158	Bellio	Oct 1991	A
5069655	Schievelbusch	Dec 1991	A
5083982	Sato	Jan 1992	A
5099710	Nakano	Mar 1992	A
5121654	Fasce	Jun 1992	A
5125677	Ogilvie	Jun 1992	A
5138894	Kraus	Aug 1992	A
5156412	Meguerditchian	Oct 1992	A
5166879	Greene	Nov 1992	A
5194052	Ueda	Mar 1993	A
5230258	Nakano	Jul 1993	A
5236211	Meguerditchian	Aug 1993	A
5236403	Schievelbusch	Aug 1993	A
5261858	Browning	Nov 1993	A
5267920	Hibi	Dec 1993	A
5269726	Swanson	Dec 1993	A
5273501	Schievelbusch	Dec 1993	A
5318486	Lutz	Jun 1994	A
5319486	Vogel	Jun 1994	A
5330396	Lohr	Jul 1994	A
5355749	Obara	Oct 1994	A
5356348	Bellio	Oct 1994	A
5375865	Terry, Sr.	Dec 1994	A
5379661	Nakano	Jan 1995	A
5383000	Michaloski	Jan 1995	A
5383677	Thomas	Jan 1995	A
5387000	Sato	Feb 1995	A
5401221	Fellows	Mar 1995	A
5413540	Streib	May 1995	A
5451070	Lindsay	Sep 1995	A
5476019	Cheever	Dec 1995	A
5489003	Ohyama	Feb 1996	A
5508574	Vlock	Apr 1996	A
5514047	Tibbles	May 1996	A
5526261	Kallis	Jun 1996	A
5531510	Yamane	Jul 1996	A
5562564	Folino	Oct 1996	A
5564998	Fellows	Oct 1996	A
5577423	Mimura	Nov 1996	A
5601301	Liu	Feb 1997	A
5607373	Ochiai	Mar 1997	A
5645507	Hathaway	Jul 1997	A
5651750	Imanishi	Jul 1997	A
5664636	Ikuma	Sep 1997	A
5669845	Muramoto	Sep 1997	A
5669846	Moroto	Sep 1997	A
5683322	Meyerle	Nov 1997	A
5690346	Keskitalo	Nov 1997	A
5701786	Kawakami	Dec 1997	A
5720687	Bennett	Feb 1998	A
D391824	Larson	Mar 1998	S
D391825	Larson	Mar 1998	S
5722502	Kubo	Mar 1998	A
5746676	Kawase	May 1998	A
5755303	Yamamoto	May 1998	A
D396396	Larson	Jul 1998	S
5799541	Arbeiter	Sep 1998	A
5819864	Koike	Oct 1998	A
5823052	Nobumoto	Oct 1998	A
5823058	Arbeiter	Oct 1998	A
5839083	Sugiyama	Nov 1998	A
5846155	Taniguchi	Dec 1998	A
5857387	Larson	Jan 1999	A
5888160	Miyata	Mar 1999	A
5895337	Fellows	Apr 1999	A
5899827	Nakano	May 1999	A
5902207	Sugihara	May 1999	A
5964123	Arbeiter	Oct 1999	A
5967933	Valdenaire	Oct 1999	A
5976054	Yasuoka	Nov 1999	A
5984826	Nakano	Nov 1999	A
5995895	Watt	Nov 1999	A
6000707	Miller	Dec 1999	A
6003649	Fischer	Dec 1999	A
6004239	Makino	Dec 1999	A
6006151	Graf	Dec 1999	A
6012538	Sonobe	Jan 2000	A
6015359	Kunii	Jan 2000	A
6019701	Mori	Feb 2000	A
6029990	Busby	Feb 2000	A
6042132	Suenaga	Mar 2000	A
6045477	Schmidt	Apr 2000	A
6045481	Kumagai	Apr 2000	A
6047230	Spencer	Apr 2000	A
6053833	Masaki	Apr 2000	A
6053841	Koide	Apr 2000	A
6054844	Frank	Apr 2000	A
6056661	Schmidt	May 2000	A
6066067	Greenwood	May 2000	A
6071210	Kato	Jun 2000	A
6074320	Miyata	Jun 2000	A
6076846	Clardy	Jun 2000	A
6079726	Busby	Jun 2000	A
6083139	Deguchi	Jul 2000	A
6085140	Choi	Jul 2000	A
6085521	Folsom	Jul 2000	A
6086506	Petersmann	Jul 2000	A
6095940	Ai	Aug 2000	A
6095945	Graf	Aug 2000	A
6099431	Hoge	Aug 2000	A
6101895	Yamane	Aug 2000	A
6113513	Itoh	Sep 2000	A
6119539	Papanicolaou	Sep 2000	A
6119800	McComber	Sep 2000	A
6125314	Graf	Sep 2000	A
6146297	Kimura	Nov 2000	A
6159126	Oshidari	Dec 2000	A
6171210	Miyata	Jan 2001	B1
6171212	Reuschel	Jan 2001	B1
6174260	Tsukada	Jan 2001	B1
6182000	Ohta	Jan 2001	B1
6186922	Bursal	Feb 2001	B1
6188945	Graf	Feb 2001	B1
6210297	Knight	Apr 2001	B1
6217473	Ueda	Apr 2001	B1
6217478	Vohmann	Apr 2001	B1
6241636	Miller	Jun 2001	B1
6243638	Abo	Jun 2001	B1
6251038	Ishikawa	Jun 2001	B1
6251043	Gierling	Jun 2001	B1
6258003	Hirano	Jul 2001	B1
6261200	Miyata	Jul 2001	B1
6266931	Erickson	Jul 2001	B1
6296593	Gotou	Oct 2001	B1
6311113	Danz	Oct 2001	B1
6312358	Goi	Nov 2001	B1
6322475	Miller	Nov 2001	B2
6325386	Shoge	Dec 2001	B1
6340067	Fujiwara	Jan 2002	B1
6356817	Abe	Mar 2002	B1
6358174	Folsom	Mar 2002	B1
6358178	Wittkopp	Mar 2002	B1
6367833	Horiuchi	Apr 2002	B1
6371878	Bowen	Apr 2002	B1
6375412	Dial	Apr 2002	B1
6390945	Young	May 2002	B1
6390946	Hibi	May 2002	B1
6406399	Ai	Jun 2002	B1
6414401	Kuroda	Jul 2002	B1
6419608	Miller	Jul 2002	B1
6425838	Matsubara	Jul 2002	B1
6434960	Rousseau	Aug 2002	B1
6440035	Tsukada	Aug 2002	B2
6440037	Takagi	Aug 2002	B2
6449548	Jain	Sep 2002	B1
6459978	Taniguchi	Oct 2002	B2
6461268	Milner	Oct 2002	B1
6470252	Tashiro	Oct 2002	B2
6482094	Kefes	Nov 2002	B2
6492785	Kasten	Dec 2002	B1
6494805	Ooyama	Dec 2002	B2
6499373	Van Cor	Dec 2002	B2
6513405	Stuermer	Feb 2003	B1
6514175	Taniguchi	Feb 2003	B2
6520878	Leclair	Feb 2003	B1
6522965	Gierling	Feb 2003	B1
6527662	Miyata	Mar 2003	B2
6532890	Chen	Mar 2003	B2
6551210	Miller	Apr 2003	B2
6558285	Sieber	May 2003	B1
6561941	Nakano	May 2003	B2
6571920	Sturmer	Jun 2003	B1
6575047	Reik	Jun 2003	B2
6588296	Wessel	Jul 2003	B2
6658338	Joe	Dec 2003	B2
6659901	Sakai	Dec 2003	B2
6672418	Makino	Jan 2004	B1
6676559	Miller	Jan 2004	B2
6679109	Gierling	Jan 2004	B2
6681652	Auer	Jan 2004	B2
6682432	Shinozuka	Jan 2004	B1
6684143	Friedrich	Jan 2004	B2
6689012	Miller	Feb 2004	B2
6694241	Kim	Feb 2004	B2
6718247	Graf	Apr 2004	B1
6721637	Abe	Apr 2004	B2
6723014	Shinso	Apr 2004	B2
6723016	Sumi	Apr 2004	B2
6805654	Nishii	Oct 2004	B2
6808053	Kirkwood	Oct 2004	B2
6839617	Mensler	Jan 2005	B2
6849020	Sumi	Feb 2005	B2
6859709	Joe	Feb 2005	B2
6868949	Braford, Jr.	Mar 2005	B2
6909953	Joe	Jun 2005	B2
6931316	Joe	Aug 2005	B2
6932739	Miyata	Aug 2005	B2
6942593	Nishii	Sep 2005	B2
6945903	Miller	Sep 2005	B2
6949049	Miller	Sep 2005	B2
6958029	Inoue	Oct 2005	B2
6991575	Inoue	Jan 2006	B2
6991579	Kobayashi	Jan 2006	B2
6994189	Chen	Feb 2006	B2
7000496	Wessel	Feb 2006	B2
7004487	Matsumoto	Feb 2006	B2
7011600	Miller	Mar 2006	B2
7011601	Miller	Mar 2006	B2
7011602	Makiyama	Mar 2006	B2
7014591	Miller	Mar 2006	B2
7029418	Taketsuna	Apr 2006	B2
7032914	Miller	Apr 2006	B2
7036620	Miller	May 2006	B2
7044884	Miller	May 2006	B2
7063195	Berhan	Jun 2006	B2
7063640	Miller	Jun 2006	B2
7074007	Miller	Jul 2006	B2
7074154	Miller	Jul 2006	B2
7074155	Miller	Jul 2006	B2
7077777	Miyata	Jul 2006	B2
7086979	Frenken	Aug 2006	B2
7086981	Ali	Aug 2006	B2
7094171	Inoue	Aug 2006	B2
7111860	Grimaldos	Sep 2006	B1
7112158	Miller	Sep 2006	B2
7112159	Miller	Sep 2006	B2
7125297	Miller	Oct 2006	B2
7131930	Miller	Nov 2006	B2
7140999	Miller	Nov 2006	B2
7147586	Miller	Dec 2006	B2
7153233	Miller	Dec 2006	B2
7156770	Miller	Jan 2007	B2
7160220	Shinojima	Jan 2007	B2
7160222	Miller	Jan 2007	B2
7163485	Miller	Jan 2007	B2
7163486	Miller	Jan 2007	B2
7163846	Sakai	Jan 2007	B2
7166052	Miller	Jan 2007	B2
7166056	Miller	Jan 2007	B2
7166057	Miller	Jan 2007	B2
7166058	Miller	Jan 2007	B2
7169076	Miller	Jan 2007	B2
7172529	Miller	Feb 2007	B2
7175564	Miller	Feb 2007	B2
7175565	Miller	Feb 2007	B2
7175566	Miller	Feb 2007	B2
7192381	Miller	Mar 2007	B2
7197915	Luh	Apr 2007	B2
7198582	Miller	Apr 2007	B2
7198583	Miller	Apr 2007	B2
7198584	Miller	Apr 2007	B2
7198585	Miller	Apr 2007	B2
7201693	Miller	Apr 2007	B2
7201694	Miller	Apr 2007	B2
7201695	Miller	Apr 2007	B2
7204777	Miller	Apr 2007	B2
7207918	Shimazu	Apr 2007	B2
7214159	Miller	May 2007	B2
7217215	Miller	May 2007	B2
7217216	Inoue	May 2007	B2
7217219	Miller	May 2007	B2
7217220	Careau	May 2007	B2
7226379	Ibamoto	Jun 2007	B2
7232395	Miller	Jun 2007	B2
7234873	Kato	Jun 2007	B2
7235031	Miller	Jun 2007	B2
7238136	Miller	Jul 2007	B2
7238137	Miller	Jul 2007	B2
7238138	Miller	Jul 2007	B2
7238139	Roethler	Jul 2007	B2
7246672	Shirai	Jul 2007	B2
7250018	Miller	Jul 2007	B2
7261663	Miller	Aug 2007	B2
7275610	Kuang	Oct 2007	B2
7285068	Hosoi	Oct 2007	B2
7288042	Miller	Oct 2007	B2
7288043	Shioiri	Oct 2007	B2
7320660	Miller	Jan 2008	B2
7322901	Miller	Jan 2008	B2
7343236	Wilson	Mar 2008	B2
7347801	Guenter	Mar 2008	B2
7383748	Rankin	Jun 2008	B2
7383749	Schaefer	Jun 2008	B2
7384370	Miller	Jun 2008	B2
7393300	Miller	Jul 2008	B2
7393302	Miller	Jul 2008	B2
7393303	Miller	Jul 2008	B2
7395731	Miller	Jul 2008	B2
7396209	Miller	Jul 2008	B2
7402122	Miller	Jul 2008	B2
7410443	Miller	Aug 2008	B2
7419451	Miller	Sep 2008	B2
7422541	Miller	Sep 2008	B2
7422546	Miller	Sep 2008	B2
7427253	Miller	Sep 2008	B2
7431677	Miller	Oct 2008	B2
7452297	Miller	Nov 2008	B2
7455611	Miller	Nov 2008	B2
7455617	Miller	Nov 2008	B2
7462123	Miller	Dec 2008	B2
7462127	Miller	Dec 2008	B2
7470210	Miller	Dec 2008	B2
7478885	Urabe	Jan 2009	B2
7481736	Miller	Jan 2009	B2
7510499	Miller	Mar 2009	B2
7540818	Miller	Jun 2009	B2
7547264	Usoro	Jun 2009	B2
7574935	Rohs	Aug 2009	B2
7591755	Petrzik	Sep 2009	B2
7632203	Miller	Dec 2009	B2
7651437	Miller	Jan 2010	B2
7654928	Miller	Feb 2010	B2
7670243	Miller	Mar 2010	B2
7686729	Miller	Mar 2010	B2
7717815	Tenberge	May 2010	B2
7727101	Miller	Jun 2010	B2
7727106	Maheu	Jun 2010	B2
7727107	Miller	Jun 2010	B2
7727108	Miller	Jun 2010	B2
7727110	Miller	Jun 2010	B2
7727115	Serkh	Jun 2010	B2
7731300	Gerstenslager	Jun 2010	B2
7731615	Miller	Jun 2010	B2
7762919	Smithson	Jul 2010	B2
7762920	Smithson	Jul 2010	B2
7770674	Miles	Aug 2010	B2
7785228	Smithson	Aug 2010	B2
7828685	Miller	Nov 2010	B2
7837592	Miller	Nov 2010	B2
7871353	Nichols	Jan 2011	B2
7882762	Armstrong	Feb 2011	B2
7883442	Miller	Feb 2011	B2
7885747	Miller	Feb 2011	B2
7887032	Malone	Feb 2011	B2
7909723	Triller	Mar 2011	B2
7909727	Smithson	Mar 2011	B2
7914029	Miller	Mar 2011	B2
7959533	Nichols	Jun 2011	B2
7963880	Smithson	Jun 2011	B2
7967719	Smithson	Jun 2011	B2
7976426	Smithson	Jul 2011	B2
8066613	Smithson	Nov 2011	B2
8066614	Miller	Nov 2011	B2
8070635	Miller	Dec 2011	B2
8087482	Miles	Jan 2012	B2
8123653	Smithson	Feb 2012	B2
8133149	Smithson	Mar 2012	B2
8142323	Tsuchiya	Mar 2012	B2
8167759	Pohl	May 2012	B2
8171636	Smithson	May 2012	B2
8197380	Heinzelmann	Jun 2012	B2
8230961	Schneidewind	Jul 2012	B2
8262536	Nichols	Sep 2012	B2
8267829	Miller	Sep 2012	B2
8313404	Carter	Nov 2012	B2
8313405	Bazyn	Nov 2012	B2
8317650	Nichols	Nov 2012	B2
8317651	Lohr	Nov 2012	B2
8321097	Vasiliotis	Nov 2012	B2
8321103	Sakaue	Nov 2012	B2
8342999	Miller	Jan 2013	B2
8360917	Nichols	Jan 2013	B2
8376889	Hoffman	Feb 2013	B2
8376903	Pohl	Feb 2013	B2
8382631	Hoffman	Feb 2013	B2
8382637	Tange	Feb 2013	B2
8393989	Pohl	Mar 2013	B2
8398518	Nichols	Mar 2013	B2
8469853	Miller	Jun 2013	B2
8469856	Thomassy	Jun 2013	B2
8480529	Pohl	Jul 2013	B2
8496554	Pohl	Jul 2013	B2
8506452	Pohl	Aug 2013	B2
8512195	Lohr	Aug 2013	B2
8517888	Brookins	Aug 2013	B1
8535199	Lohr	Sep 2013	B2
8550949	Miller	Oct 2013	B2
8585528	Carter	Nov 2013	B2
8585543	Davis	Nov 2013	B1
8608609	Sherrill	Dec 2013	B2
8622866	Bazyn	Jan 2014	B2
8626409	Vasiliotis	Jan 2014	B2
8628443	Miller	Jan 2014	B2
8641572	Nichols	Feb 2014	B2
8641577	Nichols	Feb 2014	B2
8663050	Nichols	Mar 2014	B2
8663052	Sich	Mar 2014	B2
8678974	Lohr	Mar 2014	B2
8682545	Jiang	Mar 2014	B2
8688337	Takanami	Apr 2014	B2
8708360	Miller	Apr 2014	B2
8721485	Lohr	May 2014	B2
8738255	Carter	May 2014	B2
8776633	Armstrong	Jul 2014	B2
8784248	Murakami	Jul 2014	B2
8790214	Lohr	Jul 2014	B2
8814739	Hamrin	Aug 2014	B1
8818661	Keilers	Aug 2014	B2
8827856	Younggren	Sep 2014	B1
8827864	Durack	Sep 2014	B2
8845485	Smithson	Sep 2014	B2
8852050	Thomassy	Oct 2014	B2
8870711	Pohl	Oct 2014	B2
8888643	Lohr	Nov 2014	B2
8900085	Pohl	Dec 2014	B2
8920021	Mertenat	Dec 2014	B2
8920285	Smithson	Dec 2014	B2
8924111	Fuller	Dec 2014	B2
8956262	Tomomatsu	Feb 2015	B2
8961363	Shiina	Feb 2015	B2
8968152	Beaudoin	Mar 2015	B2
8992376	Ogawa	Mar 2015	B2
8996263	Quinn, Jr.	Mar 2015	B2
9017207	Pohl	Apr 2015	B2
9022889	Miller	May 2015	B2
9046158	Miller	Jun 2015	B2
9052000	Cooper	Jun 2015	B2
9074674	Nichols	Jul 2015	B2
9086145	Pohl	Jul 2015	B2
9121464	Nichols	Sep 2015	B2
9182018	Bazyn	Nov 2015	B2
9239099	Carter	Jan 2016	B2
9249880	Vasiliotis	Feb 2016	B2
9273760	Pohl	Mar 2016	B2
9279482	Nichols	Mar 2016	B2
9291251	Lohr	Mar 2016	B2
9328807	Carter	May 2016	B2
9341246	Miller	May 2016	B2
9360089	Lohr	Jun 2016	B2
9365203	Keilers	Jun 2016	B2
9371894	Carter	Jun 2016	B2
9388896	Hibino	Jul 2016	B2
9506562	Miller	Nov 2016	B2
9528561	Nichols	Dec 2016	B2
9541179	Cooper	Jan 2017	B2
9574642	Pohl	Feb 2017	B2
9574643	Pohl	Feb 2017	B2
9611921	Thomassy	Apr 2017	B2
9618100	Lohr	Apr 2017	B2
9656672	Schieffelin	May 2017	B2
9676391	Carter	Jun 2017	B2
9677650	Nichols	Jun 2017	B2
9683638	Kolstrup	Jun 2017	B2
9683640	Lohr	Jun 2017	B2
9709138	Miller	Jul 2017	B2
9726282	Pohl	Aug 2017	B2
9732848	Miller	Aug 2017	B2
9739375	Vasiliotis	Aug 2017	B2
9833201	Niederberger	Dec 2017	B2
9845133	Craven	Dec 2017	B2
9850993	Bazyn	Dec 2017	B2
9869388	Pohl	Jan 2018	B2
9878717	Keilers	Jan 2018	B2
9878719	Carter	Jan 2018	B2
9903450	Thomassy	Feb 2018	B2
9909657	Uchino	Mar 2018	B2
9920823	Nichols	Mar 2018	B2
9945456	Nichols	Apr 2018	B2
9950608	Miller	Apr 2018	B2
9963199	Hancock	May 2018	B2
9975557	Park	May 2018	B2
10023266	Contello	Jul 2018	B2
10036453	Smithson	Jul 2018	B2
10047861	Thomassy	Aug 2018	B2
10056811	Pohl	Aug 2018	B2
10066712	Lohr	Sep 2018	B2
10066713	Nichols	Sep 2018	B2
10088026	Versteyhe	Oct 2018	B2
10100927	Quinn, Jr.	Oct 2018	B2
10197147	Lohr	Feb 2019	B2
10208840	Nichols	Feb 2019	B2
10252881	Hiltunen	Apr 2019	B2
10253859	Schoolcraft	Apr 2019	B2
10253880	Pohl	Apr 2019	B2
10253881	Hamrin	Apr 2019	B2
10260607	Carter	Apr 2019	B2
10323732	Nichols	Jun 2019	B2
10400872	Lohr	Sep 2019	B2
10428915	Thomassy	Oct 2019	B2
10428939	Miller	Oct 2019	B2
10458526	Nichols	Oct 2019	B2
10634224	Lohr	Apr 2020	B2
10703372	Carter	Jul 2020	B2
10704657	Thomassy	Jul 2020	B2
10704687	Vasiliotis	Jul 2020	B2
10711869	Miller	Jul 2020	B2
10800421	Cho	Oct 2020	B2
10920882	Thomassy	Feb 2021	B2
11174922	Nichols	Nov 2021	B2
20010008192	Morisawa	Jul 2001	A1
20010023217	Miyagawa	Sep 2001	A1
20010041644	Yasuoka	Nov 2001	A1
20010044358	Taniguchi	Nov 2001	A1
20010044361	Taniguchi	Nov 2001	A1
20010046920	Sugihara	Nov 2001	A1
20020017819	Chen	Feb 2002	A1
20020019285	Henzler	Feb 2002	A1
20020025875	Tsujioka	Feb 2002	A1
20020028722	Sakai	Mar 2002	A1
20020037786	Hirano	Mar 2002	A1
20020045511	Geiberger	Apr 2002	A1
20020049113	Watanabe	Apr 2002	A1
20020117860	Man	Aug 2002	A1
20020128107	Wakayama	Sep 2002	A1
20020151401	Lemanski	Oct 2002	A1
20020161503	Joe	Oct 2002	A1
20020169051	Oshidari	Nov 2002	A1
20020179348	Tamai	Dec 2002	A1
20020189524	Chen	Dec 2002	A1
20030015358	Abe	Jan 2003	A1
20030015874	Abe	Jan 2003	A1
20030022753	Mizuno	Jan 2003	A1
20030036456	Skrabs	Feb 2003	A1
20030096674	Uno	May 2003	A1
20030132051	Nishii	Jul 2003	A1
20030135316	Kawamura	Jul 2003	A1
20030144105	O'Hora	Jul 2003	A1
20030151300	Goss	Aug 2003	A1
20030160420	Fukuda	Aug 2003	A1
20030181286	Miller	Sep 2003	A1
20030216216	Inoue	Nov 2003	A1
20030221892	Matsumoto	Dec 2003	A1
20040038772	McIndoe	Feb 2004	A1
20040051375	Uno	Mar 2004	A1
20040058772	Inoue	Mar 2004	A1
20040067816	Taketsuna	Apr 2004	A1
20040082421	Wafzig	Apr 2004	A1
20040087412	Mori	May 2004	A1
20040092359	Imanishi	May 2004	A1
20040119345	Takano	Jun 2004	A1
20040171452	Miller	Sep 2004	A1
20040171457	Fuller	Sep 2004	A1
20040204283	Inoue	Oct 2004	A1
20040224808	Miller	Nov 2004	A1
20040231331	Iwanami	Nov 2004	A1
20040254047	Frank	Dec 2004	A1
20050037876	Unno	Feb 2005	A1
20050037886	Lemanski	Feb 2005	A1
20050064986	Ginglas	Mar 2005	A1
20050073127	Miller	Apr 2005	A1
20050079948	Miller	Apr 2005	A1
20050085326	Miller	Apr 2005	A1
20050085327	Miller	Apr 2005	A1
20050085334	Miller	Apr 2005	A1
20050085336	Miller	Apr 2005	A1
20050085337	Miller	Apr 2005	A1
20050085338	Miller	Apr 2005	A1
20050085979	Carlson	Apr 2005	A1
20050096176	Miller	May 2005	A1
20050096179	Miller	May 2005	A1
20050113202	Miller	May 2005	A1
20050113210	Miller	May 2005	A1
20050117983	Miller	Jun 2005	A1
20050119086	Miller	Jun 2005	A1
20050119087	Miller	Jun 2005	A1
20050119090	Miller	Jun 2005	A1
20050119093	Miller	Jun 2005	A1
20050124453	Miller	Jun 2005	A1
20050124456	Miller	Jun 2005	A1
20050130784	Miller	Jun 2005	A1
20050137046	Miller	Jun 2005	A1
20050137051	Miller	Jun 2005	A1
20050137052	Miller	Jun 2005	A1
20050148422	Miller	Jul 2005	A1
20050148423	Miller	Jul 2005	A1
20050153808	Miller	Jul 2005	A1
20050153809	Miller	Jul 2005	A1
20050153810	Miller	Jul 2005	A1
20050159265	Miller	Jul 2005	A1
20050159266	Miller	Jul 2005	A1
20050159267	Miller	Jul 2005	A1
20050164819	Miller	Jul 2005	A1
20050170927	Miller	Aug 2005	A1
20050176544	Miller	Aug 2005	A1
20050176545	Miller	Aug 2005	A1
20050178893	Miller	Aug 2005	A1
20050181905	Ali	Aug 2005	A1
20050184580	Kuan	Aug 2005	A1
20050197231	Miller	Sep 2005	A1
20050209041	Miller	Sep 2005	A1
20050227809	Bitzer	Oct 2005	A1
20050229731	Parks	Oct 2005	A1
20050233846	Green	Oct 2005	A1
20050255957	Miller	Nov 2005	A1
20060000684	Agner	Jan 2006	A1
20060006008	Brunemann	Jan 2006	A1
20060052204	Eckert	Mar 2006	A1
20060054422	Dimsey	Mar 2006	A1
20060084549	Smithson	Apr 2006	A1
20060108956	Clark	May 2006	A1
20060111212	Xiaolan	May 2006	A9
20060154775	Ali	Jul 2006	A1
20060172829	Ishio	Aug 2006	A1
20060180363	Uchisasai	Aug 2006	A1
20060223667	Nakazeki	Oct 2006	A1
20060234822	Morscheck	Oct 2006	A1
20060234826	Moehlmann	Oct 2006	A1
20060276299	Imanishi	Dec 2006	A1
20070004552	Matsudaira	Jan 2007	A1
20070004554	Hans	Jan 2007	A1
20070004556	Rohs	Jan 2007	A1
20070041823	Miller	Feb 2007	A1
20070049450	Miller	Mar 2007	A1
20070082770	Nihei	Apr 2007	A1
20070099753	Matsui	May 2007	A1
20070142161	Miller	Jun 2007	A1
20070149342	Guenter	Jun 2007	A1
20070155552	De Cloe	Jul 2007	A1
20070155567	Miller	Jul 2007	A1
20070155580	Nichols	Jul 2007	A1
20070167274	Petrzik	Jul 2007	A1
20070167275	Miller	Jul 2007	A1
20070167276	Miller	Jul 2007	A1
20070167277	Miller	Jul 2007	A1
20070167278	Miller	Jul 2007	A1
20070167279	Miller	Jul 2007	A1
20070167280	Miller	Jul 2007	A1
20070179013	Miller	Aug 2007	A1
20070193391	Armstrong	Aug 2007	A1
20070197337	Miller	Aug 2007	A1
20070219048	Yamaguchi	Sep 2007	A1
20070219696	Miller	Sep 2007	A1
20070228687	Parker	Oct 2007	A1
20070232423	Katou	Oct 2007	A1
20070245846	Armstrong	Oct 2007	A1
20070270265	Miller	Nov 2007	A1
20070270266	Miller	Nov 2007	A1
20070270267	Miller	Nov 2007	A1
20070270268	Miller	Nov 2007	A1
20070270269	Miller	Nov 2007	A1
20070270270	Miller	Nov 2007	A1
20070270271	Miller	Nov 2007	A1
20070270272	Miller	Nov 2007	A1
20070270278	Miller	Nov 2007	A1
20070275809	Miller	Nov 2007	A1
20070281819	Miller	Dec 2007	A1
20070287578	Miller	Dec 2007	A1
20070287579	Miller	Dec 2007	A1
20070287580	Miller	Dec 2007	A1
20080004008	Nicol	Jan 2008	A1
20080009389	Jacobs	Jan 2008	A1
20080032852	Smithson	Feb 2008	A1
20080032853	Smithson	Feb 2008	A1
20080032854	Smithson	Feb 2008	A1
20080034585	Smithson	Feb 2008	A1
20080034586	Smithson	Feb 2008	A1
20080039269	Smithson	Feb 2008	A1
20080039270	Smithson	Feb 2008	A1
20080039271	Smithson	Feb 2008	A1
20080039272	Smithson	Feb 2008	A1
20080039273	Smithson	Feb 2008	A1
20080039274	Smithson	Feb 2008	A1
20080039275	Smithson	Feb 2008	A1
20080039276	Smithson	Feb 2008	A1
20080039277	Smithson	Feb 2008	A1
20080040008	Smithson	Feb 2008	A1
20080070729	Miller	Mar 2008	A1
20080071436	Dube	Mar 2008	A1
20080073136	Miller	Mar 2008	A1
20080073137	Miller	Mar 2008	A1
20080073467	Miller	Mar 2008	A1
20080079236	Miller	Apr 2008	A1
20080081715	Miller	Apr 2008	A1
20080081728	Faulring	Apr 2008	A1
20080085795	Miller	Apr 2008	A1
20080085796	Miller	Apr 2008	A1
20080085797	Miller	Apr 2008	A1
20080085798	Miller	Apr 2008	A1
20080121486	Miller	May 2008	A1
20080121487	Miller	May 2008	A1
20080125281	Miller	May 2008	A1
20080125282	Miller	May 2008	A1
20080132373	Miller	Jun 2008	A1
20080132377	Miller	Jun 2008	A1
20080139363	Williams	Jun 2008	A1
20080141809	Miller	Jun 2008	A1
20080141810	Miller	Jun 2008	A1
20080146403	Miller	Jun 2008	A1
20080146404	Miller	Jun 2008	A1
20080149407	Shibata	Jun 2008	A1
20080161151	Miller	Jul 2008	A1
20080183358	Thomson	Jul 2008	A1
20080188345	Miller	Aug 2008	A1
20080200300	Smithson	Aug 2008	A1
20080228362	Muller	Sep 2008	A1
20080236319	Nichols	Oct 2008	A1
20080248917	Nichols	Oct 2008	A1
20080261771	Nichols	Oct 2008	A1
20080284170	Cory	Nov 2008	A1
20080305920	Nishii	Dec 2008	A1
20090011907	Radow	Jan 2009	A1
20090023545	Beaudoin	Jan 2009	A1
20090055061	Zhu	Feb 2009	A1
20090062062	Choi	Mar 2009	A1
20090082169	Kolstrup	Mar 2009	A1
20090107454	Hiyoshi	Apr 2009	A1
20090132135	Quinn, Jr.	May 2009	A1
20090164076	Vasiliotis	Jun 2009	A1
20090189397	Miller	Jul 2009	A1
20090221391	Bazyn	Sep 2009	A1
20090251013	Vollmer	Oct 2009	A1
20090280949	Lohr	Nov 2009	A1
20090312145	Pohl	Dec 2009	A1
20090318261	Tabata	Dec 2009	A1
20100056322	Thomassy	Mar 2010	A1
20100093479	Carter	Apr 2010	A1
20100093480	Pohl	Apr 2010	A1
20100093485	Pohl	Apr 2010	A1
20100120577	Gu	May 2010	A1
20100131164	Carter	May 2010	A1
20100145573	Vasilescu	Jun 2010	A1
20100181130	Chou	Jul 2010	A1
20100198453	Dorogusker	Aug 2010	A1
20100228405	Morgal	Sep 2010	A1
20100264620	Miles	Oct 2010	A1
20100267510	Nichols	Oct 2010	A1
20100313614	Rzepecki	Dec 2010	A1
20110034284	Pohl	Feb 2011	A1
20110088503	Armstrong	Apr 2011	A1
20110105274	Lohr	May 2011	A1
20110127096	Schneidewind	Jun 2011	A1
20110172050	Nichols	Jul 2011	A1
20110178684	Umemoto	Jul 2011	A1
20110184614	Keilers	Jul 2011	A1
20110190093	Bishop	Aug 2011	A1
20110218072	Lohr	Sep 2011	A1
20110230297	Shiina	Sep 2011	A1
20110237385	Andre Parise	Sep 2011	A1
20110254673	Jean	Oct 2011	A1
20110291507	Post	Dec 2011	A1
20110319222	Ogawa	Dec 2011	A1
20120029744	Yun	Feb 2012	A1
20120035011	Menachem	Feb 2012	A1
20120035015	Ogawa	Feb 2012	A1
20120035016	Miller	Feb 2012	A1
20120043841	Miller	Feb 2012	A1
20120115667	Lohr	May 2012	A1
20120130603	Simpson	May 2012	A1
20120158229	Schaefer	Jun 2012	A1
20120238386	Pohl	Sep 2012	A1
20120239235	Voigtlaender	Sep 2012	A1
20120258839	Smithson	Oct 2012	A1
20120309579	Miller	Dec 2012	A1
20130035200	Noji	Feb 2013	A1
20130053211	Fukuda	Feb 2013	A1
20130072340	Bazyn	Mar 2013	A1
20130079191	Lohr	Mar 2013	A1
20130080006	Vasiliotis	Mar 2013	A1
20130095977	Smithson	Apr 2013	A1
20130102434	Nichols	Apr 2013	A1
20130106258	Miller	May 2013	A1
20130139531	Pohl	Jun 2013	A1
20130146406	Nichols	Jun 2013	A1
20130152715	Pohl	Jun 2013	A1
20130190123	Pohl	Jul 2013	A1
20130190125	Nichols	Jul 2013	A1
20130288844	Thomassy	Oct 2013	A1
20130288848	Carter	Oct 2013	A1
20130310214	Pohl	Nov 2013	A1
20130324344	Pohl	Dec 2013	A1
20130331218	Lohr	Dec 2013	A1
20130337971	Kolstrup	Dec 2013	A1
20140011619	Pohl	Jan 2014	A1
20140011628	Lohr	Jan 2014	A1
20140038771	Miller	Feb 2014	A1
20140073470	Carter	Mar 2014	A1
20140094339	Ogawa	Apr 2014	A1
20140121922	Vasiliotis	May 2014	A1
20140128195	Miller	May 2014	A1
20140141919	Bazyn	May 2014	A1
20140144260	Nichols	May 2014	A1
20140148303	Nichols	May 2014	A1
20140155220	Messier	Jun 2014	A1
20140179479	Nichols	Jun 2014	A1
20140206499	Lohr	Jul 2014	A1
20140228163	Aratsu	Aug 2014	A1
20140248988	Lohr	Sep 2014	A1
20140257650	Carter	Sep 2014	A1
20140274536	Versteyhe	Sep 2014	A1
20140323260	Miller	Oct 2014	A1
20140329637	Thomassy	Nov 2014	A1
20140335991	Lohr	Nov 2014	A1
20140365059	Keilers	Dec 2014	A1
20150018154	Thomassy	Jan 2015	A1
20150038285	Aratsu	Feb 2015	A1
20150039195	Pohl	Feb 2015	A1
20150051801	Quinn, Jr.	Feb 2015	A1
20150072827	Lohr	Mar 2015	A1
20150080165	Pohl	Mar 2015	A1
20150219194	Winter	Aug 2015	A1
20150226323	Pohl	Aug 2015	A1
20150233473	Miller	Aug 2015	A1
20150260284	Miller	Sep 2015	A1
20150337928	Smithson	Nov 2015	A1
20150345599	Ogawa	Dec 2015	A1
20150360747	Baumgaertner	Dec 2015	A1
20150369348	Nichols	Dec 2015	A1
20150377305	Nichols	Dec 2015	A1
20160003349	Kimura	Jan 2016	A1
20160031526	Watarai	Feb 2016	A1
20160039496	Hancock	Feb 2016	A1
20160040763	Nichols	Feb 2016	A1
20160061301	Bazyn	Mar 2016	A1
20160075175	Biderman	Mar 2016	A1
20160131231	Carter	May 2016	A1
20160146342	Vasiliotis	May 2016	A1
20160178037	Pohl	Jun 2016	A1
20160186847	Nichols	Jun 2016	A1
20160195177	Versteyhe	Jul 2016	A1
20160201772	Lohr	Jul 2016	A1
20160244063	Carter	Aug 2016	A1
20160273627	Miller	Sep 2016	A1
20160281825	Lohr	Sep 2016	A1
20160290451	Lohr	Oct 2016	A1
20160298740	Carter	Oct 2016	A1
20160347411	Yamamoto	Dec 2016	A1
20160362108	Keilers	Dec 2016	A1
20160377153	Ajumobi	Dec 2016	A1
20170072782	Miller	Mar 2017	A1
20170082049	David	Mar 2017	A1
20170102053	Nichols	Apr 2017	A1
20170103053	Guerra	Apr 2017	A1
20170106866	Schieffelin	Apr 2017	A1
20170159812	Pohl	Jun 2017	A1
20170163138	Pohl	Jun 2017	A1
20170204948	Thomassy	Jul 2017	A1
20170204969	Thomassy	Jul 2017	A1
20170211696	Nassouri	Jul 2017	A1
20170211698	Lohr	Jul 2017	A1
20170225742	Hancock	Aug 2017	A1
20170268638	Nichols	Sep 2017	A1
20170274903	Carter	Sep 2017	A1
20170276217	Nichols	Sep 2017	A1
20170284519	Kolstrup	Oct 2017	A1
20170284520	Lohr	Oct 2017	A1
20170314655	Miller	Nov 2017	A1
20170328470	Pohl	Nov 2017	A1
20170335961	Hamrin	Nov 2017	A1
20170343105	Vasiliotis	Nov 2017	A1
20170364995	Yan	Dec 2017	A1
20180036593	Ridgel	Feb 2018	A1
20180066754	Miller	Mar 2018	A1
20180106359	Kawakami	Apr 2018	A1
20180119786	Mepham	May 2018	A1
20180134750	Alkan	May 2018	A1
20180148055	Carter	May 2018	A1
20180148056	Keilers	May 2018	A1
20180195586	Thomassy	Jul 2018	A1
20180202527	Nichols	Jul 2018	A1
20180221714	Anderson	Aug 2018	A1
20180236867	Miller	Aug 2018	A1
20180251190	Hancock	Sep 2018	A1
20180306283	Engesather	Oct 2018	A1
20180327060	De Jager	Nov 2018	A1
20180347693	Thomassy	Dec 2018	A1
20180372192	Lohr	Dec 2018	A1
20190049004	Quinn, Jr.	Feb 2019	A1
20190102858	Pivnick	Apr 2019	A1
20190195321	Smithson	Jun 2019	A1
20190277399	Guerin	Sep 2019	A1
20190323582	Horak	Oct 2019	A1
20200018384	Nichols	Jan 2020	A1

Foreign Referenced Citations (354)

Number	Date	Country
118064	Dec 1926	CH
1047556	Dec 1990	CN
1054340	Sep 1991	CN
2245830	Jan 1997	CN
1157379	Aug 1997	CN
1167221	Dec 1997	CN
1178573	Apr 1998	CN
1178751	Apr 1998	CN
1204991	Jan 1999	CN
2320843	May 1999	CN
1281540	Jan 2001	CN
1283258	Feb 2001	CN
1297404	May 2001	CN
1300355	Jun 2001	CN
1412033	Apr 2003	CN
1434229	Aug 2003	CN
1474917	Feb 2004	CN
1483235	Mar 2004	CN
1555466	Dec 2004	CN
1568407	Jan 2005	CN
1654858	Aug 2005	CN
2714896	Aug 2005	CN
1736791	Feb 2006	CN
1791731	Jun 2006	CN
1847702	Oct 2006	CN
1860315	Nov 2006	CN
1896562	Jan 2007	CN
1940348	Apr 2007	CN
101016076	Aug 2007	CN
101166922	Apr 2008	CN
101312867	Nov 2008	CN
201777370	Mar 2011	CN
102165219	Aug 2011	CN
102287530	Dec 2011	CN
102947626	Feb 2013	CN
203358799	Dec 2013	CN
103857576	Jun 2014	CN
104648595	May 2015	CN
104854380	Aug 2015	CN
108501935	Sep 2018	CN
498701	May 1930	DE
866748	Feb 1953	DE
1165372	Mar 1964	DE
1171692	Jun 1964	DE
2021027	Dec 1970	DE
2136243	Feb 1972	DE
2310880	Sep 1974	DE
2436496	Feb 1975	DE
3940919	Jun 1991	DE
4120540	Nov 1992	DE
19851738	May 2000	DE
10155372	May 2003	DE
10261372	Jul 2003	DE
102009016869	Oct 2010	DE
102011016672	Oct 2012	DE
102012107360	Feb 2013	DE
102012107927	Feb 2013	DE
102012210842	Jan 2014	DE
102012212526	Jan 2014	DE
102012023551	Jun 2014	DE
102012222087	Jun 2014	DE
102013201101	Jul 2014	DE
102014007271	Dec 2014	DE
102013214169	Jan 2015	DE
102019121883	Sep 2020	DE
0432742	Jun 1991	EP
0528381	Feb 1993	EP
0528382	Feb 1993	EP
0635639	Jan 1995	EP
0638741	Feb 1995	EP
0831249	Mar 1998	EP
0832816	Apr 1998	EP
0877341	Nov 1998	EP
0976956	Feb 2000	EP
1010612	Jun 2000	EP
1136724	Sep 2001	EP
1188602	Mar 2002	EP
1251294	Oct 2002	EP
1362783	Nov 2003	EP
1366978	Dec 2003	EP
1433641	Jun 2004	EP
1452441	Sep 2004	EP
1518785	Mar 2005	EP
1624230	Feb 2006	EP
1811202	Jul 2007	EP
1850038	Oct 2007	EP
2261108	Dec 2010	EP
2338782	Jun 2011	EP
2464560	Jun 2012	EP
2602672	Jun 2013	EP
2620672	Jul 2013	EP
2357128	Aug 2014	EP
2893219	Jul 2015	EP
2927534	Oct 2015	EP
620375	Apr 1927	FR
2460427	Jan 1981	FR
2590638	May 1987	FR
2909938	Jun 2008	FR
2996276	Apr 2014	FR
3073479	May 2019	FR
391448	Apr 1933	GB
592320	Sep 1947	GB
772749	Apr 1957	GB
858710	Jan 1961	GB
906002	Sep 1962	GB
919430	Feb 1963	GB
1132473	Nov 1968	GB
1165545	Oct 1969	GB
1376057	Dec 1974	GB
2031822	Apr 1980	GB
2035481	Jun 1980	GB
2035482	Jun 1980	GB
2080452	Feb 1982	GB
38025315	Nov 1963	JP
413126	Feb 1966	JP
0422844	Feb 1967	JP
441098	Jan 1969	JP
46029087	Aug 1971	JP
47448	Jan 1972	JP
47962	Jan 1972	JP
47207	Jun 1972	JP
4720535	Jun 1972	JP
47001621	Aug 1972	JP
4700962	Nov 1972	JP
4729762	Nov 1972	JP
4854371	Jul 1973	JP
4912742	Mar 1974	JP
49013823	Apr 1974	JP
49041536	Nov 1974	JP
50114581	Sep 1975	JP
5125903	Aug 1976	JP
51150380	Dec 1976	JP
5235481	Mar 1977	JP
53048166	Jan 1978	JP
5350395	Apr 1978	JP
55135259	Oct 1980	JP
5624251	Mar 1981	JP
56047231	Apr 1981	JP
56101448	Aug 1981	JP
56127852	Oct 1981	JP
58065361	Apr 1983	JP
59069565	Apr 1984	JP
59144826	Aug 1984	JP
59190557	Oct 1984	JP
6073958	May 1985	JP
60247011	Dec 1985	JP
61031754	Feb 1986	JP
61053423	Mar 1986	JP
61173722	Oct 1986	JP
61270552	Nov 1986	JP
62075170	Apr 1987	JP
63125854	May 1988	JP
63219953	Sep 1988	JP
63160465	Oct 1988	JP
01210653	Aug 1989	JP
01039865	Nov 1989	JP
01286750	Nov 1989	JP
01308142	Dec 1989	JP
02130224	May 1990	JP
02157483	Jun 1990	JP
02271142	Jun 1990	JP
02182593	Jul 1990	JP
03149442	Jun 1991	JP
03223555	Oct 1991	JP
422843	Jan 1992	JP
470207	Mar 1992	JP
470962	Mar 1992	JP
479762	Mar 1992	JP
04166619	Jun 1992	JP
04272553	Sep 1992	JP
04327055	Nov 1992	JP
04351361	Dec 1992	JP
05087154	Apr 1993	JP
0650358	Feb 1994	JP
06050169	Feb 1994	JP
07042799	Feb 1995	JP
07133857	May 1995	JP
07139600	May 1995	JP
07259950	Oct 1995	JP
08135748	May 1996	JP
08170706	Jul 1996	JP
08247245	Sep 1996	JP
08270772	Oct 1996	JP
09024743	Jan 1997	JP
09089064	Mar 1997	JP
1078094	Mar 1998	JP
10061739	Mar 1998	JP
10089435	Apr 1998	JP
10115355	May 1998	JP
10115356	May 1998	JP
10194186	Jul 1998	JP
10225053	Aug 1998	JP
10511621	Nov 1998	JP
H10307964	Nov 1998	JP
11063130	Mar 1999	JP
11091411	Apr 1999	JP
11210850	Aug 1999	JP
11227669	Aug 1999	JP
11240481	Sep 1999	JP
11257479	Sep 1999	JP
11317653	Nov 1999	JP
2000006877	Jan 2000	JP
2000046135	Feb 2000	JP
2000177673	Jun 2000	JP
2001027298	Jan 2001	JP
2001071986	Mar 2001	JP
2001107827	Apr 2001	JP
2001165296	Jun 2001	JP
2001234999	Aug 2001	JP
2001328466	Nov 2001	JP
2001521109	Nov 2001	JP
2002147558	May 2002	JP
61144466	Sep 2002	JP
2002250421	Sep 2002	JP
2002291272	Oct 2002	JP
2002307956	Oct 2002	JP
2002533626	Oct 2002	JP
2002372114	Dec 2002	JP
2003028257	Jan 2003	JP
2003056662	Feb 2003	JP
2003507261	Feb 2003	JP
2003161357	Jun 2003	JP
2003194206	Jul 2003	JP
2003194207	Jul 2003	JP
2003524119	Aug 2003	JP
2003320987	Nov 2003	JP
2003336732	Nov 2003	JP
2004011834	Jan 2004	JP
2004038722	Feb 2004	JP
2004162652	Jun 2004	JP
2004189222	Jul 2004	JP
2004232776	Aug 2004	JP
2004526917	Sep 2004	JP
2004301251	Oct 2004	JP
2005003063	Jan 2005	JP
2005096537	Apr 2005	JP
2005188694	Jul 2005	JP
2005240928	Sep 2005	JP
2005312121	Nov 2005	JP
2006015025	Jan 2006	JP
2006283900	Oct 2006	JP
2006300241	Nov 2006	JP
2007085404	Apr 2007	JP
2007321931	Dec 2007	JP
2007535715	Dec 2007	JP
2008002687	Jan 2008	JP
2008014412	Jan 2008	JP
2008133896	Jun 2008	JP
4351361	Oct 2009	JP
2010069005	Apr 2010	JP
2010532454	Oct 2010	JP
2011178341	Sep 2011	JP
2012501418	Jan 2012	JP
2012506001	Mar 2012	JP
4913823	Apr 2012	JP
4941536	May 2012	JP
2012107725	Jun 2012	JP
2012121338	Jun 2012	JP
2012122568	Jun 2012	JP
2012211610	Nov 2012	JP
2012225390	Nov 2012	JP
2013521452	Jun 2013	JP
2013147245	Aug 2013	JP
5348166	Nov 2013	JP
5647231	Dec 2014	JP
5668205	Feb 2015	JP
2015505022	Feb 2015	JP
2015075148	Apr 2015	JP
2015227690	Dec 2015	JP
2015227691	Dec 2015	JP
5865361	Feb 2016	JP
5969565	Aug 2016	JP
6131754	May 2017	JP
6153423	Jun 2017	JP
6275170	Feb 2018	JP
2018025315	Feb 2018	JP
20020054126	Jul 2002	KR
20020071699	Sep 2002	KR
20080079274	Aug 2008	KR
20080081030	Sep 2008	KR
20130018976	Feb 2013	KR
101339282	Jan 2014	KR
98467	Jul 1961	NL
74007	Jan 1984	TW
175100	Dec 1991	TW
218909	Jan 1994	TW
227206	Jul 1994	TW
275872	May 1996	TW
294598	Jan 1997	TW
360184	Jun 1999	TW
366396	Aug 1999	TW
401496	Aug 2000	TW
510867	Nov 2002	TW
512211	Dec 2002	TW
582363	Apr 2004	TW
590955	Jun 2004	TW
225129	Dec 2004	TW
225912	Jan 2005	TW
235214	Jul 2005	TW
200637745	Nov 2006	TW
200741116	Nov 2007	TW
200821218	May 2008	TW
201339049	Oct 2013	TW
9908024	Feb 1999	WO
9920918	Apr 1999	WO
2000061388	Oct 2000	WO
0138758	May 2001	WO
2001073319	Oct 2001	WO
2002088573	Nov 2002	WO
2003086849	Oct 2003	WO
2003100294	Dec 2003	WO
2004079223	Sep 2004	WO
2005019669	Mar 2005	WO
2005083305	Sep 2005	WO
2005108825	Nov 2005	WO
2005111472	Nov 2005	WO
2006014617	Feb 2006	WO
2006047887	May 2006	WO
2006091503	Aug 2006	WO
2007061993	May 2007	WO
2007070167	Jun 2007	WO
2007077502	Jul 2007	WO
2008002457	Jan 2008	WO
2008057507	May 2008	WO
2008078047	Jul 2008	WO
2008095116	Aug 2008	WO
2008100792	Aug 2008	WO
2008101070	Aug 2008	WO
2008131353	Oct 2008	WO
2008154437	Dec 2008	WO
2009006481	Jan 2009	WO
2009148461	Dec 2009	WO
2009157920	Dec 2009	WO
2010017242	Feb 2010	WO
2010024809	Mar 2010	WO
2010044778	Apr 2010	WO
2010073036	Jul 2010	WO
2010094515	Aug 2010	WO
2010135407	Nov 2010	WO
2011064572	Jun 2011	WO
2011101991	Aug 2011	WO
2011109444	Sep 2011	WO
2011121743	Oct 2011	WO
2011124415	Oct 2011	WO
2011138175	Nov 2011	WO
2012030213	Mar 2012	WO
2013042226	Mar 2013	WO
2013112408	Aug 2013	WO
2014186732	Nov 2014	WO
2016022553	Feb 2016	WO
2016062461	Apr 2016	WO
2016079620	May 2016	WO
2017056541	Apr 2017	WO
2017186911	Nov 2017	WO

Non-Patent Literature Citations (83)

Entry
Chinese Office Action dated Aug. 26, 2013 for Chinese Patent Application No. 201110120716.1.
Chinese Office Action dated Dec. 24, 2012 for Chinese Patent Application No. 201110120717.6.
Chinese Office Action dated Jan. 22, 2010 for Chinese Patent Application No. 200680052833.6.
Chinese Office Action dated May 28, 2013 for Chinese Patent Application No. 201110120717.6.
Examination Report dated Dec. 17, 2020 in Indian Patent Application No. 201837029026, 7 pages.
Examination report dated Jul. 11, 2018 in Indian Patent Application No. 2060/KOLNP/2010.
Examination Report dated Mar. 2, 2017 in Indian Patent Application No. 2772/KOLNP/2008.
Examination Report dated Sep. 25, 2013 for European Patent Application No. 06816430.0.
First Office Action dated Sep. 2, 2015 in Chinese Patent Application No. 201410145485.3.
International Search Report and Written Opinion dated Apr. 16, 2008, for PCT Application No. PCT/US2007/023315.
International Search Report and Written Opinion dated Dec. 20, 2006 from International Patent Application No. PCT/US2006/033104, filed on Aug. 23, 2006.
International Search Report and Written Opinion dated Feb. 2, 2010 from International Patent Application No. PCT/US2008/068929, filed on Jan. 7, 2008.
International Search Report and Written Opinion dated Jan. 25, 2010 from International Patent Application No. PCT/US2009/052761, filed on Aug. 4, 2009.
International Search Report and Written Opinion dated Jul. 21, 2017 in PCT/US2017/032023.
International Search Report and Written Opinion dated Jul. 27, 2009 from International Patent Application No. PCT/US2008/079879, filed on Oct. 14, 2008.
International Search Report and Written Opinion dated Jun. 27, 2017 in PCT/US2016/063880.
International Search Report and Written Opinion dated May 16, 2007 from International Patent Application No. PCT/IB2006/054911, dated Dec. 18, 2006.
International Search Report and Written Opinion dated May 19, 2009 from International Patent Application No. PCT/US2008/083660, filed on Nov. 14, 2008.
International Search Report and Written Opinion dated May 8, 2020 in PCT/US2020/019446.
International Search Report and Written Opinion dated Nov. 13, 2009 from International Patent Application No. PCT/US2008/053951, filed on Feb. 14, 2008.
International Search Report dated May 16, 2007, for PCT Application No. PCT/IB2006/054911.
International Search Report dated Nov. 21, 2002, for PCT Application No. PCT/US02/13399, filed on Apr. 25, 2002.
International Search Report for International Application No. PCT/US04/15652 dated Aug. 26, 2005.
International Search Report for International Application No. PCT/US05/25539 dated Jun. 8, 2006.
International Search Report for International Application No. PCT/US07/14510 dated Sep. 23, 2008.
International Search Report for International Application No. PCT/US2006/041389 dated Sep. 24, 2007.
International Search Report for International Application No. PCT/US2006/044983 dated Jun. 13, 2008.
International Search Report for International Application No. PCT/US2008/053347 dated Jul. 18, 2008.
International Search Report for International application No. PCT/US2005/035164 dated Jun. 27, 2007.
International Search Report for International Application No. PCT/US2006/039166 dated Feb. 27, 2007.
International Search Report for International application No. PCT/US2009/035540 dated Aug. 6, 2009.
Invitation to Pay Additional Fees dated May 3, 2017 in PCT/US2016/063880.
Notice of Office Action dated Jun. 22, 2016 in Taiwan Patent Application No. 103129866.
Notification of Reasons for Rejection dated Oct. 6, 2020 in Japanese Patent Application No. 2018-536480, 21 pages.
Notification of Reexamination dated Aug. 29, 2013 for Chinese Patent Application No. 200680052833.6.
Notification of the First Office Action dated Jun. 26, 2019 in Chinese Patent Application No. 201680080281.3.
Notification of the Second Office Action dated Mar. 16, 2020 in Chinese Patent Application No. 201680080281.3, 15 pages.
Office Action dated Apr. 2, 2014 in U.S. Appl. No. 13/288,711.
Office Action dated Aug. 13, 2013 for Canadian Patent Application No. 2632751.
Office Action dated Aug. 20, 2010 for Chinese Patent Application No. 200680052482.9.
Office Action dated Aug. 23, 2006 from Japanese Patent Application No. 2000-517205.
Office Action dated Aug. 29, 2013 in U.S. Appl. No. 13/288,711.
Office Action dated Aug. 3, 2015 in U.S. Appl. No. 14/541,875.
Office Action dated Dec. 12, 2011 for U.S. Appl. No. 12/271,611.
Office Action dated Dec. 12, 2016 in U.S. Appl. No. 13/938,056.
Office Action dated Dec. 29, 2017 in U.S. Appl. No. 14/839,567.
Office Action dated Dec. 4, 2012 for Korean Patent Application No. 10-2008-7016716.
Office Action dated Feb. 17, 2010 from Japanese Patent Application No. 2009-294086.
Office Action dated Feb. 24, 2010 from Japanese Patent Application No. 2006-508892.
Office Action dated Jan. 18, 2017 in U.S. Appl. No. 14/529,773.
Office Action dated Jan. 20, 2012 for U.S. Appl. No. 12/137,456.
Office Action dated Jan. 20, 2015 in U.S. Appl. No. 13/682,176.
Office Action dated Jul. 16, 2012 for U.S. Appl. No. 12/271,611.
Office Action dated Jul. 18, 2016 in U.S. Appl. No. 13/938,056.
Office Action dated Jul. 25, 2012 for European Patent Application No. 06816430.0.
Office Action dated Jul. 5, 2017 in U.S. Appl. No. 14/529,773.
Office Action dated Jul. 6, 2016 in U.S. Appl. No. 14/529,773.
Office Action dated Jun. 19, 2014 in U.S. Appl. No. 13/682,176.
Office Action dated Jun. 28, 2011 from Japanese Patent Application No. 2009-518168.
Office Action dated Jun. 8, 2018 in U.S. Appl. No. 14/839,567.
Office Action dated Mar. 14, 2012 for U.S. Appl. No. 12/137,480.
Office Action dated Mar. 18, 2010 from U.S. Appl. No. 12/137,464.
Office Action dated Mar. 5, 2015 in U.S. Appl. No. 14/541,875.
Office Action dated May 17, 2002 for Chinese Patent Application No. 98812170.0.
Office Action dated May 17, 2012 for U.S. Appl. No. 12/159,688.
Office Action dated May 29, 2013 for Chinese Patent Application No. 200880116244.9.
Office Action dated Nov. 14, 2012 for U.S. Appl. No. 12/159,688.
Office Action dated Nov. 14, 2017 in U.S. Appl. No. 15/172,031, 5 pages.
Office Action dated Nov. 3, 2017 in U.S. Appl. No. 14/996,743, 10 pages.
Office Action dated Oct. 19, 2012 for Canadian Patent Application No. 2632751.
Office Action dated Sep. 14, 2010 for Japanese Patent Application No. 2007-278224.
Office Action dated Sep. 15, 2010 for U.S. Appl. No. 11/543,311.
Office Action dated Sep. 24, 2012 for Chinese Patent Application No. 200880116244.9.
Office Action dated Sep. 24, 2012 for Taiwanese Patent Application No. 095137289.
Office Action dated Sep. 28, 2005 for Japanese Patent Application No. 2001-540276.
Partial International Search Report for International Application No. PCT/US2008/052685 dated Sep. 2, 2008.
Preliminary Notice of First Office Action dated Jan. 14, 2014 for Taiwanese Patent Application No. 095137289.
Preliminary Notice of First Office Action dated Jun. 20, 2014 in Taiwanese Patent Application No. 97144386.
Rejection Decision dated May 29, 2015 in Taiwanese Patent Application No. 97144386.
Second Office Action dated Feb. 24, 2016 in Chinese Patent Application No. 201410145485.3.
Supplementary European Search Report dated Apr. 1, 2009, for European Application No. 04715691.4, filed Feb. 7, 2004.
Taiwan Search Report and Preliminary Notice of First Office Action dated Oct. 30, 2008 for Taiwanese Patent Application No. 094134761.
Thomassy, Fernand A., “An Engineering Approach to Simulating Traction EHL”, CVT-Hybrid International Conference Mecc/Maastricht/The Netherlands, Nov. 17-19, 2010, p. 97.

Related Publications (1)

	Number	Date	Country
	20220074470 A1	Mar 2022	US

Provisional Applications (1)

	Number	Date	Country
	62810832	Feb 2019	US

Continuations (1)

	Number	Date	Country
Parent	16799025	Feb 2020	US
Child	17527775		US

Reversible variable drives and systems and methods for control in forward and reverse directions

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