Patent Grant
10626958
The present disclosure relates to a multi-speed transmission and in particular to a multi-speed transmission including a plurality of planetary gearsets and a plurality of selective couplers to achieve at least nine forward speed ratios and at least one reverse speed ratio.
Multi-speed transmissions use a plurality of planetary gearsets, selective couplers, interconnectors, and additional elements to achieve a plurality of forward and reverse speed ratios. Exemplary multi-speed transmissions are disclosed in US Published Patent Application No. 2016/0047440, Ser. No. 14/457,592, titled MULTI-SPEED TRANSMISSION, filed Aug. 12, 2014, the entire disclosure of which is expressly incorporated by reference herein.
The present disclosure provides a multi-speed transmission including a plurality of planetary gearsets and a plurality of selective couplers to achieve at least nine forward speed ratios. The plurality of planetary gearsets may include a first planetary gearset, a second planetary gearset, a third planetary gearset, and a fourth planetary gearset. The plurality of selective couplers may include a number of clutches and a number of brakes. In one example, the present disclosure provides a multi-speed transmission having four planetary gearsets and six selective couplers. The six selective couplers include two clutches and four brakes. In another example, the present disclosure provides a multi-speed transmission having four planetary gearsets and six selective couplers, wherein at least two of the four planetary gearsets are minus planetary gearsets and at least one of the four planetary gearsets is a plus planetary gearset.
In some instances throughout this disclosure and in the claims, numeric terminology, such as first, second, third, and fourth, is used in reference to various gearsets, gears, gearset components, interconnectors, selective couplers, and other components. Such use is not intended to denote an ordering of the components. Rather, numeric terminology is used to assist the reader in identifying the component being referenced and should not be narrowly interpreted as providing a specific order of components. For example, a first planetary gearset identified in the drawings may support any one of the plurality of planetary gearsets recited in the claims, including the first planetary gearset, the second planetary gearset, the third planetary gearset, and the fourth planetary gearset, depending on the language of the claims.
According to an exemplary embodiment of the present disclosure, a transmission is provided. The transmission comprising at least one stationary member; an input member rotatable relative to the at least one stationary member; a plurality of planetary gearsets operatively coupled to the input member; and an output member operatively coupled to the input member through the plurality of planetary gearsets and rotatable relative to the at least one stationary member. Each of the plurality of planetary gearsets includes a first gearset component, a second gearset component, and a third gearset component. The plurality of planetary gearsets includes a first planetary gearset, a second planetary gearset, a third planetary gearset, and a fourth planetary gearset. The input member is fixedly coupled to the first gearset component of the second planetary gearset. The transmission further comprising a first interconnector which fixedly couples the third gearset component of the first planetary gearset to the third gearset component of the second planetary gearset; a second interconnector which fixedly couples the second gearset component of the first planetary gearset, the second gearset component of the second planetary gearset, and the third gearset component of the third planetary gearset together; a third interconnector which fixedly couples the second gearset component of the third planetary gearset to the fourth planetary gearset; and a plurality of selective couplers including a first number of clutches and a second number of brakes, the second number being greater than the first number.
In another exemplary embodiment, a transmission is provided. The transmission comprising at least one stationary member; an input member rotatable relative to the at least one stationary member; a plurality of planetary gearsets operatively coupled to the input member; and an output member operatively coupled to the input member through the plurality of planetary gearsets and rotatable relative to the at least one stationary member. The plurality of planetary gearsets includes a first planetary gearset, a second planetary gearset, and a third planetary gearset. Each of the second planetary gearset and the third planetary gearset includes a first gearset component, a second gearset component, and a third gearset component. The first planetary gearset includes a plurality of first gearset components, a second gearset component, and a third gearset component. The input member is fixedly coupled to the first planetary gearset. The transmission further comprising a first interconnector which fixedly couples the second gearset component of the first planetary gearset to the second planetary gearset; a second interconnector which fixedly couples the second gearset component of the second planetary gearset to the third planetary gearset; and a plurality of selective couplers including a first number of clutches and a second number of brakes. The second number is greater than the first number.
In yet another exemplary embodiment, a transmission is provided. The transmission comprising at least one stationary member; an input member rotatable relative to the at least one stationary member; a plurality of planetary gearsets operatively coupled to the input member; and an output member operatively coupled to the input member through the plurality of planetary gearsets and rotatable relative to the at least one stationary member. The plurality of planetary gearsets includes a first planetary gearset including a plurality of first gearset components, a second gearset component, and a third gearset component and a second planetary gearset including a first gearset component, a second gearset component, and a plurality of third gearset components. The transmission further comprising an interconnector which fixedly couples the second gearset component of the first planetary gearset to a first one of the plurality of the third gearset components of the second planetary gearset; and a plurality of selective couplers including a first number of clutches and a second number of brakes. The second number is greater than the first number. The output member is fixedly coupled to a second one of the plurality of the third gearset components of the second planetary gearset and the input member is fixedly coupled to the first planetary gearset.
In still another exemplary embodiment, a transmission is provided. The transmission comprising at least one stationary member; an input member rotatable relative to the at least one stationary member; a plurality of planetary gearsets operatively coupled to the input member; and an output member operatively coupled to the input member through the plurality of planetary gearsets and rotatable relative to the at least one stationary member. The plurality of planetary gearsets includes a first planetary gearset, a second planetary gearset, and a third planetary gearset. Each of the first planetary gearset and the second planetary gearset includes a first gearset component, a second gearset component, and a third gearset component. The third planetary gearset includes a first gearset component, a second gearset component, and a plurality of third gearset components. The input member is fixedly coupled to the second planetary gearset. The transmission further comprises a first interconnector which fixedly couples the second gearset component of the second planetary gearset to a first one of the plurality of third gearset components of the third planetary gearset; and a plurality of selective couplers. The plurality of selective couplers include a first selective coupler which, when engaged, fixedly couples the third gearset component of the first planetary gearset and the third gearset component of the second planetary gearset to the at least one stationary member; a second selective coupler which, when engaged, fixedly couples the first gearset component of the second planetary gearset to the first gearset component of the third planetary gearset; a third selective coupler which, when engaged, fixedly couples the first gearset component of the second planetary gearset to the second gearset component of the third planetary gearset; a fourth selective coupler which, when engaged, fixedly couples the first gearset component of the first planetary gearset to the at least one stationary member; a fifth selective coupler which, when engaged, fixedly couples the second gearset component of the first planetary gearset, the second gearset component of the second planetary gearset, and the first one of the plurality of third gearset components of the third planetary gearset to the at least one stationary member; and a sixth selective coupler which, when engaged, fixedly couples the second gearset component of the third planetary gearset to the at least one stationary member.
The above-mentioned and other features and advantages of this disclosure, and the manner of attaining them, will become more apparent and will be better understood by reference to the following description of exemplary embodiments taken in conjunction with the accompanying drawings, wherein:
Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate exemplary embodiments of the invention and such exemplifications are not to be construed as limiting the scope of the invention in any manner.
For the purposes of promoting an understanding of the principles of the present disclosure, reference is now made to the embodiments illustrated in the drawings, which are described below. The embodiments disclosed below are not intended to be exhaustive or limit the present disclosure to the precise forms disclosed in the following detailed description. Rather, the embodiments are chosen and described so that others skilled in the art may utilize their teachings. Therefore, no limitation of the scope of the present disclosure is thereby intended. Corresponding reference characters indicate corresponding parts throughout the several views.
In the disclosed transmission embodiment, selective couplers are disclosed. A selective coupler is a device which may be actuated to fixedly couple two or more components together. A selective coupler fixedly couples two or more components to rotate together as a unit when the selective coupler is in an engaged configuration. Further, the two or more components may be rotatable relative to each other when the selective coupler is in a disengaged configuration. The terms “couples”, “coupled”, “coupler” and variations thereof are used to include both arrangements wherein the two or more components are in direct physical contact and arrangements wherein the two or more components are not in direct contact with each other (e.g., the components are “coupled” via at least a third component), but yet still cooperate or interact with each other.
A first exemplary selective coupler is a clutch. A clutch couples two or more rotating components to one another so that the two or more rotating components rotate together as a unit in an engaged configuration and permits relative rotation between the two or more rotating components in the disengaged position. Exemplary clutches may be shiftable friction-locked multi-disk clutches, shiftable form-locking claw or conical clutches, wet clutches, or any other known form of a clutch.
A second exemplary selective coupler is a brake. A brake couples one or more rotatable components to a stationary component to hold the one or more rotatable components stationary relative to the stationary component in the engaged configuration and permits rotation of the one or more components relative to the stationary component in the disengaged configuration. Exemplary brakes may be configured as shiftable-friction-locked disk brakes, shiftable friction-locked band brakes, shiftable form-locking claw or conical brakes, or any other known form of a brake.
Selective couplers may be actively controlled devices or passive devices. Exemplary actively controlled devices include hydraulically actuated clutch or brake elements and electrically actuated clutch or brake elements. Additional details regarding systems and methods for controlling selective couplers are disclosed in the above-incorporated US Published Patent Application No. 2016/0047440.
In addition to coupling through selective couplers, various components of the disclosed transmission embodiments may be fixedly coupled together continuously throughout the operation of the disclosed transmissions. Components may be fixedly coupled together either permanently or removably. Components may be fixedly coupled together through spline connections, press fitting, fasteners, welding, machined or formed functional portions of a unitary piece, or other suitable methods of connecting components.
The disclosed transmission embodiments include a plurality of planetary gearsets. Each planetary gearset includes at least four components: a sun gear; a ring gear; a plurality of planet gears; and a carrier that is rotatably coupled to and carries the planet gears. In the case of a simple planetary gearset, the teeth of the sun gear are intermeshed with the teeth of the planet gears which are in turn engaged with the teeth of the ring gear. Each of these components may also be referred to as a gearset component. A simple planetary gearset is one example of a minus planetary gearset. A minus planetary gearset is a planetary gearset wherein, when the planet carrier is held stationary, the ring gear rotates in the opposite direction of the sun gear.
It will be apparent to one of skill in the art that some planetary gearsets may include further components than those explicitly identified. For example, one or more of the planetary gearsets may include two sets of planet gears. A first set of planet gears may intermesh with the sun gear while the second set of planet gears intermesh with the first set of planet gears and the ring gear. Both sets of planet gears are carried by the planet carrier. This arrangement is one example of a plus planetary gearset and may be referred to as an idler planetary gearset. A plus planetary gearset is a planetary gearset wherein, when the planet carrier is held stationary, the ring gear rotates in the same direction as the sun gear.
One or more rotating components, such as shafts, drums, and other components, may be collectively referred to as an interconnector when the one or more components are fixedly coupled together. Interconnectors may further be fixedly coupled to one or more gearset components and/or one or more selective couplers.
An input member of the disclosed transmission embodiments is rotated by a prime mover. Exemplary prime movers include internal combustion engines, electric motors, hybrid power systems, and other suitable power systems. In one embodiment, the prime mover indirectly rotates the input member through a clutch and/or a torque converter. An output member of the disclosed transmission embodiments provides rotational power to one or more working components. Exemplary working components include one or more drive wheels of a motor vehicle, a power take-off shaft, and other suitable devices. The output member is rotated based on the interconnections of the gearset components and the selective couplers of the transmission. By changing the interconnections of the gearset components and the selective couplers, a rotation speed of the output member may be varied from a rotation speed of the input member.
The illustrated transmission embodiments are capable of transferring torque from the input member to the output member and rotating the output member in at least nine forward gear or speed ratios relative to the input member and one reverse gear or speed ratio wherein the rotation direction of the output member is reversed relative to its rotation direction for the at least nine forward ratios. Exemplary gear ratios that may be obtained using the illustrated embodiment of the present disclosure are disclosed herein. Of course, other gear ratios are achievable depending on the characteristics of the gearsets utilized. Exemplary characteristics include respective gear diameters, the number of gear teeth, and the configurations of the various gears.
Multi-speed transmission 100 includes a plurality of planetary gearsets, illustratively a first planetary gearset 108, a second planetary gearset 110, a third planetary gearset 112, and a fourth planetary gearset 114. In one embodiment, additional planetary gearsets may be included. In the illustrated embodiment, multi-speed transmission 100 includes three minus planetary gearsets 108, 112, and 114 and one plus planetary gearset 110. Further, although first planetary gearset 108, third planetary gearset 112, and fourth planetary gearset 114 are illustrated as minus planetary gearsets, it is contemplated that one or more may be plus planetary gearsets. Additionally, second planetary gearset 110 may be a minus planetary gearset instead of a plus planetary gearset.
In one embodiment, multi-speed transmission 100 is arranged as illustrated in
First planetary gearset 108 includes a sun gear 120, a planet carrier 122 supporting a plurality of planet gears 124, and a ring gear 126. Second planetary gearset 110 includes a sun gear 130, a planet carrier 134 supporting a first plurality of planet gears 131 and a second plurality of planet gears 133, and a ring gear 136. The first plurality of planet gears 131 intermesh with sun gear 130. The second plurality of planet gears 133 intermesh with the first plurality of planet gears 131 and ring gear 136. Third planetary gearset 112 includes a sun gear 140, a planet carrier 142 supporting a plurality of planet gears 144, and a ring gear 146. Fourth planetary gearset 114 includes a sun gear 150, a planet carrier 152 supporting a plurality of planet gears 154, and a ring gear 156.
Multi-speed transmission 100 further includes a plurality of selective couplers, illustratively a first selective coupler 162, a second selective coupler 164, a third selective coupler 166, a fourth selective coupler 168, a fifth selective coupler 170, and a sixth selective coupler 172. In the illustrated embodiment, first selective coupler 162, fourth selective coupler 168, fifth selective coupler 170, and sixth selective coupler 172 are brakes and second selective coupler 164 and third selective coupler 166 are clutches. The axial locations of the clutches and brakes relative to the plurality of planetary gearsets may be altered from the illustrated axial locations.
Multi-speed transmission 100 includes several components that are illustratively shown as being fixedly coupled together. Input member 102 is fixedly coupled to sun gear 130 of second planetary gearset 110, second selective coupler 164, and third selective coupler 166. Output member 104 is fixedly coupled to planet carrier 152 of fourth planetary gearset 114. Ring gear 126 of first planetary gearset 108, ring gear 136 of second planetary gearset 110, and first selective coupler 162 are fixedly coupled together. Planet carrier 122 of first planetary gearset 108, planet carrier 134 of second planetary gearset 110, ring gear 146 of third planetary gearset 112, and fifth selective coupler 170 are fixedly coupled together. Sun gear 120 of first planetary gearset 108 is fixedly coupled to fourth selective coupler 168. Planet carrier 142 of third planetary gearset 112, ring gear 156 of fourth planetary gearset 114, third selective coupler 166, and sixth selective coupler 172 are fixedly coupled together. Sun gear 140 of third planetary gearset 112, sun gear 150 of fourth planetary gearset 114, and second selective coupler 164 are fixedly coupled together. In alternative embodiments, one or more of the components fixedly coupled together are selectively coupled together through one or more selective couplers.
Multi-speed transmission 100 may be described as having seven interconnectors. Input member 102 is a first interconnector which both provides input torque to multi-speed transmission 100 and fixedly couples sun gear 130 of second planetary gearset 110, second selective coupler 164, and third selective coupler 166 together. Output member 104 is a second interconnector which both provides output torque from multi-speed transmission 100 and is fixedly coupled to planet carrier 152 of fourth planetary gearset 114. A third interconnector 180 fixedly couples ring gear 126 of first planetary gearset 108, ring gear 136 of second planetary gearset 110, and first selective coupler 162 together. A fourth interconnector 182 fixedly couples planet carrier 122 of first planetary gearset 108, planet carrier 134 of second planetary gearset 110, ring gear 146 of third planetary gearset 112, and fifth selective coupler 170 together. A fifth interconnector 184 fixedly couples sun gear 120 of first planetary gearset 108 to fourth selective coupler 168. A sixth interconnector 186 fixedly couples planet carrier 142 of third planetary gearset 112, ring gear 156 of fourth planetary gearset 114, third selective coupler 166, and sixth selective coupler 172 together. A seventh interconnector 188 fixedly couples sun gear 140 of third planetary gearset 112, sun gear 150 of fourth planetary gearset 114, and second selective coupler 164 together.
Multi-speed transmission 100 further includes several components that are illustratively shown as being selectively coupled together through selective couplers. First selective coupler 162, when engaged, fixedly couples ring gear 126 of first planetary gearset 108 and ring gear 136 of second planetary gearset 110 to stationary member 106. When first selective coupler 162 is disengaged, ring gear 126 of first planetary gearset 108 and ring gear 136 of second planetary gearset 110 may rotate relative to stationary member 106.
Second selective coupler 164, when engaged, fixedly couples sun gear 130 of second planetary gearset 110 to sun gear 140 of third planetary gearset 112 and sun gear 150 of fourth planetary gearset 114. When second selective coupler 164 is disengaged, sun gear 130 of second planetary gearset 110 may rotate relative to sun gear 140 of third planetary gearset 112 and sun gear 150 of fourth planetary gearset 114.
Third selective coupler 166, when engaged, fixedly couples sun gear 130 of second planetary gearset 110 to planet carrier 142 of third planetary gearset 112 and ring gear 156 of fourth planetary gearset 114. When third selective coupler 166 is disengaged, sun gear 130 of second planetary gearset 110 may rotate relative to planet carrier 142 of third planetary gearset 112 and ring gear 156 of fourth planetary gearset 114.
Fourth selective coupler 168, when engaged, fixedly couples sun gear 120 of first planetary gearset 108 to stationary member 106. When fourth selective coupler 168 is disengaged, sun gear 120 of first planetary gearset 108 may rotate relative to stationary member 106.
Fifth selective coupler 170, when engaged, fixedly couples ring gear 146 of third planetary gearset 112, planet carrier 134 of second planetary gearset 110, and planet carrier 122 of first planetary gearset 108 to stationary member 106. When fifth selective coupler 170 is disengaged, ring gear 146 of third planetary gearset 112, planet carrier 134 of second planetary gearset 110, and planet carrier 122 of first planetary gearset 108 may rotate relative to stationary member 106.
Sixth selective coupler 172, when engaged, fixedly couples ring gear 156 of fourth planetary gearset 114 and planet carrier 142 of third planetary gearset 112 to stationary member 106. When sixth selective coupler 172 is disengaged, ring gear 156 of fourth planetary gearset 114 and planet carrier 142 of third planetary gearset 112 may rotate relative to stationary member 106.
By engaging various combinations of first selective coupler 162, second selective coupler 164, third selective coupler 166, fourth selective coupler 168, fifth selective coupler 170, and sixth selective coupler 172, additional components of multi-speed transmission 100 may be fixedly coupled together.
The plurality of planetary gearsets and the plurality of selective couplers of multi-speed transmission 100 may be interconnected in various arrangements to provide torque from input member 102 to output member 104 in at least nine forward gear or speed ratios and one reverse gear or speed ratio. Referring to
In the example of
In one embodiment, to place multi-speed transmission 100 in neutral (Neu), all of first selective coupler 162, second selective coupler 164, third selective coupler 166, fourth selective coupler 168, fifth selective coupler 170, and sixth selective coupler 172 are in the disengaged configuration. One or more of first selective coupler 162, second selective coupler 164, third selective coupler 166, fourth selective coupler 168, fifth selective coupler 170, and sixth selective coupler 172 may remain engaged in neutral (Neu) as long as the combination of first selective coupler 162, second selective coupler 164, third selective coupler 166, fourth selective coupler 168, fifth selective coupler 170, and sixth selective coupler 172 does not transmit torque from input member 102 to output member 104.
A first forward ratio (shown as 1st) in truth table 200 of
A second or subsequent forward ratio (shown as 2nd) in truth table 200 of
A third or subsequent forward ratio (shown as 3rd) in truth table 200 of
A fourth or subsequent forward ratio (shown as 4th) in truth table 200 of
A fifth or subsequent forward ratio (shown as 5th) in truth table 200 of
A sixth or subsequent forward ratio (shown as 6th) in truth table 200 of
A seventh or subsequent forward ratio (shown as 7th) in truth table 200 of
An eighth or subsequent forward ratio (shown as 8th) in truth table 200 of
A ninth or subsequent forward ratio (shown as 9th) in truth table 200 of
The present disclosure contemplates that downshifts follow the reverse sequence of the corresponding upshift (as described above). Further, several power-on skip-shifts that are single-transition are possible (e.g. from 1st up to 3rd, from 3rd down to 1st, from 3rd up to 5th, and from 5th down to 3rd).
Multi-speed transmission 300 includes a plurality of planetary gearsets, illustratively a first planetary gearset 308, a second planetary gearset 310, a third planetary gearset 312, and a fourth planetary gearset 314. In one embodiment, additional planetary gearsets may be included. In the illustrated embodiment, multi-speed transmission 300 includes two minus planetary gearsets 308 and 312 and two plus planetary gearsets 310 and 314. Further, although first planetary gearset 308 and third planetary gearset 312 are illustrated as minus planetary gearsets, it is contemplated that one or more may be plus planetary gearsets. Additionally, one or more of second planetary gearset 310 and fourth planetary gearset 314 may be a minus planetary gearset instead of a plus planetary gearset.
In one embodiment, multi-speed transmission 300 is arranged as illustrated in
First planetary gearset 308 includes a sun gear 320, a planet carrier 322 supporting a plurality of planet gears 324, and a ring gear 326. Second planetary gearset 310 includes a sun gear 330, a planet carrier 334 supporting a first plurality of planet gears 331 and a second plurality of planet gears 333, and a ring gear 336. The first plurality of planet gears 331 intermesh with sun gear 330. The second plurality of planet gears 333 intermesh with the first plurality of planet gears 331 and ring gear 336. Third planetary gearset 312 includes a sun gear 340, a planet carrier 342 supporting a plurality of planet gears 344, and a ring gear 346. Fourth planetary gearset 314 includes a sun gear 350, a planet carrier 354 supporting a first plurality of planet gears 351 and a second plurality of planet gears 353, and a ring gear 356. The first plurality of planet gears 351 intermesh with sun gear 350. The second plurality of planet gears 353 intermesh with the first plurality of planet gears 351 and ring gear 356.
Multi-speed transmission 300 further includes a plurality of selective couplers, illustratively a first selective coupler 362, a second selective coupler 364, a third selective coupler 366, a fourth selective coupler 368, a fifth selective coupler 370, and a sixth selective coupler 372. In the illustrated embodiment, first selective coupler 362, fourth selective coupler 368, fifth selective coupler 370, and sixth selective coupler 372 are brakes and second selective coupler 364 and third selective coupler 366 are clutches. The axial locations of the clutches and brakes relative to the plurality of planetary gearsets may be altered from the illustrated axial locations.
Multi-speed transmission 300 includes several components that are illustratively shown as being fixedly coupled together. Input member 302 is fixedly coupled to sun gear 330 of second planetary gearset 310, second selective coupler 364, and third selective coupler 366. Output member 304 is fixedly coupled to ring gear 356 of fourth planetary gearset 314. Ring gear 326 of first planetary gearset 308, ring gear 336 of second planetary gearset 310, and first selective coupler 362 are fixedly coupled together. Planet carrier 322 of first planetary gearset 308, planet carrier 334 of second planetary gearset 310, ring gear 346 of third planetary gearset 312, and fifth selective coupler 370 are fixedly coupled together. Sun gear 320 of first planetary gearset 308 is fixedly coupled to fourth selective coupler 368. Planet carrier 342 of third planetary gearset 312, planet carrier 354 of fourth planetary gearset 314, third selective coupler 366, and sixth selective coupler 372 are fixedly coupled together. Sun gear 340 of third planetary gearset 312, sun gear 350 of fourth planetary gearset 314, and second selective coupler 364 are fixedly coupled together. In alternative embodiments, one or more of the components fixedly coupled together are selectively coupled together through one or more selective couplers.
Multi-speed transmission 300 may be described as having seven interconnectors. Input member 302 is a first interconnector which both provides input torque to multi-speed transmission 300 and fixedly couples sun gear 330 of second planetary gearset 310, second selective coupler 364, and third selective coupler 366 together. Output member 304 is a second interconnector which both provides output torque from multi-speed transmission 300 and is fixedly coupled to ring gear 356 of fourth planetary gearset 314. A third interconnector 380 fixedly couples ring gear 326 of first planetary gearset 308, ring gear 336 of second planetary gearset 310, and first selective coupler 362 together. A fourth interconnector 382 fixedly couples planet carrier 322 of first planetary gearset 308, planet carrier 334 of second planetary gearset 310, ring gear 346 of third planetary gearset 312, and fifth selective coupler 370 together. A fifth interconnector 384 fixedly couples sun gear 320 of first planetary gearset 308 to fourth selective coupler 368. A sixth interconnector 386 fixedly couples planet carrier 342 of third planetary gearset 312, planet carrier 354 of fourth planetary gearset 314, third selective coupler 366, and sixth selective coupler 372 together. A seventh interconnector 388 fixedly couples sun gear 340 of third planetary gearset 312, sun gear 350 of fourth planetary gearset 314, and second selective coupler 364 together.
Multi-speed transmission 300 further includes several components that are illustratively shown as being selectively coupled together through selective couplers. First selective coupler 362, when engaged, fixedly couples ring gear 326 of first planetary gearset 308 and ring gear 336 of second planetary gearset 310 to stationary member 306. When first selective coupler 362 is disengaged, ring gear 326 of first planetary gearset 308 and ring gear 336 of second planetary gearset 310 may rotate relative to stationary member 306.
Second selective coupler 364, when engaged, fixedly couples sun gear 330 of second planetary gearset 310 to sun gear 340 of third planetary gearset 312 and sun gear 350 of fourth planetary gearset 314. When second selective coupler 364 is disengaged, sun gear 330 of second planetary gearset 310 may rotate relative to sun gear 340 of third planetary gearset 312 and sun gear 350 of fourth planetary gearset 314.
Third selective coupler 366, when engaged, fixedly couples sun gear 330 of second planetary gearset 310 to planet carrier 342 of third planetary gearset 312 and planet carrier 354 of fourth planetary gearset 314. When third selective coupler 366 is disengaged, sun gear 330 of second planetary gearset 310 may rotate relative to planet carrier 342 of third planetary gearset 312 and planet carrier 354 of fourth planetary gearset 314.
Fourth selective coupler 368, when engaged, fixedly couples sun gear 320 of first planetary gearset 308 to stationary member 306. When fourth selective coupler 368 is disengaged, sun gear 320 of first planetary gearset 308 may rotate relative to stationary member 306.
Fifth selective coupler 370, when engaged, fixedly couples ring gear 346 of third planetary gearset 312, planet carrier 334 of second planetary gearset 310, and planet carrier 322 of first planetary gearset 308 to stationary member 306. When fifth selective coupler 370 is disengaged, ring gear 346 of third planetary gearset 312, planet carrier 334 of second planetary gearset 310, and planet carrier 322 of first planetary gearset 308 may rotate relative to stationary member 306.
Sixth selective coupler 372, when engaged, fixedly couples planet carrier 354 of fourth planetary gearset 314 and planet carrier 342 of third planetary gearset 312 to stationary member 306. When sixth selective coupler 372 is disengaged, planet carrier 354 of fourth planetary gearset 314 and planet carrier 342 of third planetary gearset 312 may rotate relative to stationary member 306.
By engaging various combinations of first selective coupler 362, second selective coupler 364, third selective coupler 366, fourth selective coupler 368, fifth selective coupler 370, and sixth selective coupler 372, additional components of multi-speed transmission 300 may be fixedly coupled together.
The plurality of planetary gearsets and the plurality of selective couplers of multi-speed transmission 300 may be interconnected in various arrangements to provide torque from input member 302 to output member 304 in at least nine forward gear or speed ratios and one reverse gear or speed ratio. Referring to
In the example of
In one embodiment, to place multi-speed transmission 300 in neutral (Neu), all of first selective coupler 362, second selective coupler 364, third selective coupler 366, fourth selective coupler 368, fifth selective coupler 370, and sixth selective coupler 372 are in the disengaged configuration. One or more of first selective coupler 362, second selective coupler 364, third selective coupler 366, fourth selective coupler 368, fifth selective coupler 370, and sixth selective coupler 372 may remain engaged in neutral (Neu) as long as the combination of first selective coupler 362, second selective coupler 364, third selective coupler 366, fourth selective coupler 368, fifth selective coupler 370, and sixth selective coupler 372 does not transmit torque from input member 302 to output member 304.
A first forward ratio (shown as 1st) in truth table 400 of
A second or subsequent forward ratio (shown as 2nd) in truth table 400 of
A third or subsequent forward ratio (shown as 3rd) in truth table 400 of
A fourth or subsequent forward ratio (shown as 4th) in truth table 400 of
A fifth or subsequent forward ratio (shown as 5th) in truth table 400 of
A sixth or subsequent forward ratio (shown as 6th) in truth table 400 of
A seventh or subsequent forward ratio (shown as 7th) in truth table 400 of
An eighth or subsequent forward ratio (shown as 8th) in truth table 400 of
A ninth or subsequent forward ratio (shown as 9th) in truth table 400 of
The present disclosure contemplates that downshifts follow the reverse sequence of the corresponding upshift (as described above). Further, several power-on skip-shifts that are single-transition are possible (e.g. from 1st up to 3rd, from 3rd down to 1st, from 3rd up to 5th, and from 5th down to 3rd).
Multi-speed transmission 500 includes a plurality of planetary gearsets, illustratively a first planetary gearset 508, a second planetary gearset 512, and a third planetary gearset 514. In one embodiment, additional planetary gearsets may be included. In the illustrated embodiment, multi-speed transmission 500 includes one compound gearset 508 and two simple gearsets 512 and 514. In the illustrated embodiment, first planetary gearset 508 is a Ravigneaux gearset.
In one embodiment, multi-speed transmission 500 is arranged as illustrated in
First planetary gearset 508 includes a first sun gear 520, a second sun gear 530, a planet carrier 534 supporting a first plurality of planet gears 531 and a second plurality of planet gears 533, and a ring gear 536. The first plurality of planet gears 531 intermesh with sun gear 530. The second plurality of planet gears 533 intermesh with the first plurality of planet gears 531, ring gear 536, and first sun gear 520. Second planetary gearset 512 includes a sun gear 540, a planet carrier 542 supporting a plurality of planet gears 544, and a ring gear 546. Third planetary gearset 514 includes a sun gear 550, a planet carrier 552 supporting a plurality of planet gears 554, and a ring gear 556.
Multi-speed transmission 500 further includes a plurality of selective couplers, illustratively a first selective coupler 562, a second selective coupler 564, a third selective coupler 566, a fourth selective coupler 568, a fifth selective coupler 570, and a sixth selective coupler 572. In the illustrated embodiment, first selective coupler 562, fourth selective coupler 568, fifth selective coupler 570, and sixth selective coupler 572 are brakes and second selective coupler 564 and third selective coupler 566 are clutches. The axial locations of the clutches and brakes relative to the plurality of planetary gearsets may be altered from the illustrated axial locations.
Multi-speed transmission 500 includes several components that are illustratively shown as being fixedly coupled together. Input member 502 is fixedly coupled to sun gear 530 of first planetary gearset 508, second selective coupler 564, and third selective coupler 566. Output member 504 is fixedly coupled to planet carrier 552 of third planetary gearset 514. Ring gear 536 of first planetary gearset 508 and first selective coupler 562 are fixedly coupled together. Planet carrier 534 of first planetary gearset 508, ring gear 546 of second planetary gearset 512, and fifth selective coupler 570 are fixedly coupled together. Sun gear 520 of first planetary gearset 508 is fixedly coupled to fourth selective coupler 568. Planet carrier 542 of second planetary gearset 512, ring gear 556 of third planetary gearset 514, third selective coupler 566, and sixth selective coupler 572 are fixedly coupled together. Sun gear 540 of second planetary gearset 512, sun gear 550 of third planetary gearset 514, and second selective coupler 564 are fixedly coupled together. In alternative embodiments, one or more of the components fixedly coupled together are selectively coupled together through one or more selective couplers.
Multi-speed transmission 500 may be described as having seven interconnectors. Input member 502 is a first interconnector which both provides input torque to multi-speed transmission 500 and fixedly couples sun gear 530 of first planetary gearset 508, second selective coupler 564, and third selective coupler 566 together. Output member 504 is a second interconnector provides output torque from multi-speed transmission 500 and is fixedly coupled to planet carrier 552 of third planetary gearset 514. A third interconnector 580 fixedly couples ring gear 536 of first planetary gearset 508 and first selective coupler 562 together. A fourth interconnector 582 fixedly couples planet carrier 534 of first planetary gearset 508, ring gear 546 of second planetary gearset 512, and fifth selective coupler 570 together. A fifth interconnector 584 fixedly couples sun gear 520 of first planetary gearset 508 to fourth selective coupler 568. A sixth interconnector 586 fixedly couples planet carrier 542 of second planetary gearset 512, ring gear 556 of third planetary gearset 514, third selective coupler 566, and sixth selective coupler 572 together. A seventh interconnector 588 fixedly couples sun gear 540 of second planetary gearset 512, sun gear 550 of third planetary gearset 514, and second selective coupler 564 together.
Multi-speed transmission 500 further includes several components that are illustratively shown as being selectively coupled together through selective couplers. First selective coupler 562, when engaged, fixedly couples ring gear 536 of first planetary gearset 508 to stationary member 506. When first selective coupler 562 is disengaged, ring gear 536 of first planetary gearset 508 may rotate relative to stationary member 506.
Second selective coupler 564, when engaged, fixedly couples sun gear 530 of first planetary gearset 508 to sun gear 540 of second planetary gearset 512 and sun gear 550 of third planetary gearset 514. When second selective coupler 564 is disengaged, sun gear 530 of first planetary gearset 508 may rotate relative to sun gear 540 of second planetary gearset 512 and sun gear 550 of third planetary gearset 514.
Third selective coupler 566, when engaged, fixedly couples sun gear 530 of first planetary gearset 508 to planet carrier 542 of second planetary gearset 512 and ring gear 556 of third planetary gearset 514. When third selective coupler 566 is disengaged, sun gear 530 of first planetary gearset 508 may rotate relative to planet carrier 542 of second planetary gearset 512 and ring gear 556 of third planetary gearset 514.
Fourth selective coupler 568, when engaged, fixedly couples sun gear 520 of first planetary gearset 508 to stationary member 506. When fourth selective coupler 568 is disengaged, sun gear 520 of first planetary gearset 508 may rotate relative to stationary member 506.
Fifth selective coupler 570, when engaged, fixedly couples ring gear 546 of second planetary gearset 512 and planet carrier 534 of first planetary gearset 508 to stationary member 506. When fifth selective coupler 570 is disengaged, ring gear 546 of second planetary gearset 512 and planet carrier 534 of first planetary gearset 508 may rotate relative to stationary member 506.
Sixth selective coupler 572, when engaged, fixedly couples ring gear 556 of third planetary gearset 514 and planet carrier 542 of second planetary gearset 512 to stationary member 506. When sixth selective coupler 572 is disengaged, ring gear 556 of third planetary gearset 514 and planet carrier 542 of second planetary gearset 512 may rotate relative to stationary member 506.
By engaging various combinations of first selective coupler 562, second selective coupler 564, third selective coupler 566, fourth selective coupler 568, fifth selective coupler 570, and sixth selective coupler 572, additional components of multi-speed transmission 500 may be fixedly coupled together.
The plurality of planetary gearsets and the plurality of selective couplers of multi-speed transmission 500 may be interconnected in various arrangements to provide torque from input member 502 to output member 504 in at least nine forward gear or speed ratios and one reverse gear or speed ratio. Multi-speed transmission 500, like multi-speed transmission 100, is able to provide the nine forward gears and one reverse gear illustrated in
Multi-speed transmission 700 includes a plurality of planetary gearsets, illustratively a first planetary gearset 708 and a second planetary gearset 712. In one embodiment, additional planetary gearsets may be included. In the illustrated embodiment, multi-speed transmission 700 includes two compound gearsets 708 and 712. In one embodiment, first planetary gearset 708 is replaced with first planetary gearset 308 and second planetary gearset 310 resulting in multi-speed transmission 700 including a compound gearset 712 and two simple gearsets 308 and 310. In this embodiment, interconnectors 702, 782, and 784 (discussed below) would connect to planetary gearsets 308 and 310 in the same manner as interconnectors 302, 382, and 384, respectively. In the illustrated embodiment, first planetary gearset 708 and second planetary gearset 712 are both Ravigneaux gearsets.
In one embodiment, multi-speed transmission 700 is arranged as illustrated in
First planetary gearset 708 includes a first sun gear 720, a second sun gear 730, a planet carrier 734 supporting a first plurality of planet gears 731 and a second plurality of planet gears 733, and a ring gear 736. The first plurality of planet gears 731 intermesh with sun gear 730. The second plurality of planet gears 733 intermesh with the first plurality of planet gears 731, ring gear 736, and first sun gear 720. Second planetary gearset 712 includes a sun gear 750, a planet carrier 754 supporting a first plurality of planet gears 751 and a second plurality of planet gears 753, a first ring gear 746, and a second ring gear 756. The first plurality of planet gears 751 intermesh with sun gear 750 and ring gear 746. The second plurality of planet gears 753 intermesh with the first plurality of planet gears 751 land ring gear 756.
Multi-speed transmission 700 further includes a plurality of selective couplers, illustratively a first selective coupler 762, a second selective coupler 764, a third selective coupler 766, a fourth selective coupler 768, a fifth selective coupler 770, and a sixth selective coupler 772. In the illustrated embodiment, first selective coupler 762, fourth selective coupler 768, fifth selective coupler 770, and sixth selective coupler 772 are brakes and second selective coupler 764 and third selective coupler 766 are clutches. The axial locations of the clutches and brakes relative to the plurality of planetary gearsets may be altered from the illustrated axial locations.
Multi-speed transmission 700 includes several components that are illustratively shown as being fixedly coupled together. Input member 702 is fixedly coupled to sun gear 730 of first planetary gearset 708, second selective coupler 764, and third selective coupler 766. Output member 704 is fixedly coupled to ring gear 756 of second planetary gearset 712. Ring gear 736 of first planetary gearset 708 and first selective coupler 762 are fixedly coupled together. Planet carrier 734 of first planetary gearset 708, ring gear 746 of second planetary gearset 712, and fifth selective coupler 770 are fixedly coupled together. Sun gear 720 of first planetary gearset 708 is fixedly coupled to fourth selective coupler 768. Planet carrier 754 of second planetary gearset 712, third selective coupler 766, and sixth selective coupler 772 are fixedly coupled together. Sun gear 750 of second planetary gearset 712 and second selective coupler 764 are fixedly coupled together. In alternative embodiments, one or more of the components fixedly coupled together are selectively coupled together through one or more selective couplers.
Multi-speed transmission 700 may be described as having seven interconnectors. Input member 702 is a first interconnector which both provides input torque to multi-speed transmission 700 and fixedly couples sun gear 730 of first planetary gearset 708, second selective coupler 764, and third selective coupler 766 together. Output member 704 is a second interconnector provides output torque from multi-speed transmission 700 and is fixedly coupled to ring gear 756 of second planetary gearset 712. A third interconnector 780 fixedly couples ring gear 736 of first planetary gearset 708 and first selective coupler 762 together. A fourth interconnector 782 fixedly couples planet carrier 734 of first planetary gearset 708, ring gear 746 of second planetary gearset 712, and fifth selective coupler 770 together. A fifth interconnector 784 fixedly couples sun gear 720 of first planetary gearset 708 to fourth selective coupler 768. A sixth interconnector 786 fixedly couples planet carrier 754 of second planetary gearset 712, third selective coupler 766, and sixth selective coupler 772 together. A seventh interconnector 788 fixedly couples sun gear 750 of second planetary gearset 712 and second selective coupler 764 together.
Multi-speed transmission 700 further includes several components that are illustratively shown as being selectively coupled together through selective couplers. First selective coupler 762, when engaged, fixedly couples ring gear 736 of first planetary gearset 708 to stationary member 706. When first selective coupler 762 is disengaged, ring gear 736 of first planetary gearset 708 may rotate relative to stationary member 706.
Second selective coupler 764, when engaged, fixedly couples sun gear 730 of first planetary gearset 708 to sun gear 750 of second planetary gearset 712. When second selective coupler 764 is disengaged, sun gear 730 of first planetary gearset 708 may rotate relative to sun gear 750 of second planetary gearset 712.
Third selective coupler 766, when engaged, fixedly couples sun gear 730 of first planetary gearset 708 to planet carrier 754 of second planetary gearset 712. When third selective coupler 766 is disengaged, sun gear 730 of first planetary gearset 708 may rotate relative to planet carrier 754 of second planetary gearset 712.
Fourth selective coupler 768, when engaged, fixedly couples sun gear 720 of first planetary gearset 708 to stationary member 706. When fourth selective coupler 768 is disengaged, sun gear 720 of first planetary gearset 708 may rotate relative to stationary member 706.
Fifth selective coupler 770, when engaged, fixedly couples ring gear 746 of second planetary gearset 712 and planet carrier 734 of first planetary gearset 708 to stationary member 706. When fifth selective coupler 770 is disengaged, ring gear 746 of second planetary gearset 712 and planet carrier 734 of first planetary gearset 708 may rotate relative to stationary member 706.
Sixth selective coupler 772, when engaged, fixedly couples planet carrier 754 of second planetary gearset 712 to stationary member 706. When sixth selective coupler 772 is disengaged, planet carrier 754 of second planetary gearset 712 may rotate relative to stationary member 706.
By engaging various combinations of first selective coupler 762, second selective coupler 764, third selective coupler 766, fourth selective coupler 768, fifth selective coupler 770, and sixth selective coupler 772, additional components of multi-speed transmission 700 may be fixedly coupled together.
The plurality of planetary gearsets and the plurality of selective couplers of multi-speed transmission 700 may be interconnected in various arrangements to provide torque from input member 702 to output member 704 in at least nine forward gear or speed ratios and one reverse gear or speed ratio. Multi-speed transmission 700, like multi-speed transmission 300, is able to provide the nine forward gears and one reverse gear illustrated in
In the illustrated embodiments, various combinations of two of the available selective couplers are engaged for each of the illustrated forward speed ratios and reverse speed ratios. Additional forward speed ratios and reverse speed ratios are possible based on other combinations of engaged selective couplers. Although in the illustrated embodiments, each forward speed ratio and reverse speed ratio has two of the available selective couplers engaged, it is contemplated that more than two selective couplers may be engaged at the same time.
While this invention has been described as having exemplary designs, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.
This application is a continuation of prior application Ser. No. 15/278,288, filed Aug. 28, 2016, titled MULTI-SPEED PLANETARY TRANSMISSION, the entire disclosure of which is expressly incorporated by reference herein.
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| Number | Date | Country | |
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| 20190249755 A1 | Aug 2019 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 15278288 | Sep 2016 | US |
| Child | 16396948 | US |
