Patent Grant
10479160
The present disclosure relates to a hydraulic damper or shock absorber for use in a suspension system of a vehicle. More particularly, to a damper having an integrated electronic system.
This section provides background information related to the present disclosure which is not necessarily prior art.
Shock absorbers are used in conjunction with automotive suspension systems to absorb unwanted vibrations which occur during driving. To absorb the unwanted vibrations, shock absorbers are generally connected between the sprung portion (body) and the unsprung portion (suspension) of the automobile.
In recent years, vehicles may be equipped with an electrically adjustable damping system that includes an electrically adjustable hydraulic shock absorber. Such adjustable shock absorbers may include an electromechanical valve/actuator disposed therein. A main control unit disposed within the vehicle is used to control the damping state of each of the adjustable shock absorber by controlling the actuation of the electromechanical valve.
This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.
The present disclosure relates to a damper system for a vehicle. The damper system includes an electrically adjustable hydraulic shock absorber and a bumper cap assembly that is coupled to an end of the shock absorber.
In an aspect of the present disclosure, the bumper cap assembly for an electrically adjustable hydraulic shock absorber is provided. The shock absorber includes a rod guide, a piston rod guided by the rod guide, and an electronically-controlled valve positioned within the rod guide. The electronically-controlled valve controls a damping state of the shock absorber. The bumper cap assembly includes a circuit board positioned around the piston rod. The circuit board is adapted to actuate the electronically-controlled valve. Further, a carrier housing receives the circuit board and engages with the rod guide. The carrier housing includes an inner column and an outer column located radially outwards with respect to the inner column. The bumper cap assembly further includes a bumper cap mounted on the carrier housing and engaged with the inner column and the outer column. Further, the inner column and the outer column transfer compressive axial loads from the bumper cap to the rod guide during an operation of the shock absorber. The carrier housing includes features that allows easy installation, sealing, and protection of the components mounted within the carrier housing from the environment. The carrier housing has structural features that minimize deflection and transfer energy to the shock absorber, thereby protecting the components mounted therein.
An electrically adjustable hydraulic shock absorber includes a tube defining a fluid chamber and a piston assembly positioned within the tube. The piston assembly divides the fluid chamber into a first working chamber and a second working chamber. A piston rod is attached to the piston assembly and projects out of the tube. Further, a rod guide guides the piston rod and an electronically-controlled valve is positioned within the rod guide for controlling a damping state of the shock absorber. A circuit board is positioned around the piston rod. The circuit board is adapted to actuate the electronically-controlled valve. A carrier housing receives the circuit board and engages with the rod guide. The carrier housing includes an inner column and an outer column located radially outwards with respect to the inner column. A bumper cap is mounted on the carrier housing and engaged with the inner column and the outer column. Further, the inner column and the outer column transfer compressive axial loads from the bumper cap to the rod guide during an operation of the shock absorber.
An electrically adjustable hydraulic shock absorber includes a tube defining a fluid chamber and a piston assembly positioned within the tube. The piston assembly divides the fluid chamber into a first working chamber and a second working chamber. A piston rod is attached to the piston assembly and projects out of the tube. Further, a rod guide guides the piston rod and an electronically-controlled valve is positioned within the rod guide for controlling a damping state of the shock absorber. A circuit board is positioned around the piston rod. The circuit board is adapted to actuate the electronically-controlled valve. Further, at least one terminal pin connects the circuit board with the electronically-controlled valve. The at least one terminal pin is directly connected with the circuit board. A carrier housing receives the circuit board and engages with the rod guide. The carrier housing includes an inner column, an outer column located radially outwards with respect to the inner column, and a receiving portion for receiving the at least one terminal pin therethrough. A bumper cap is mounted on the carrier housing and engaged with the inner column and the outer column. Further, the inner column and the outer column transfer compressive axial loads from the bumper cap to the rod guide during an operation of the shock absorber.
Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.
Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings.
The present disclosure will now be described more fully with reference to the accompanying drawings. With reference to
The damper systems 20 serve to dampen the relative motion of the unsprung portion (i.e., front and rear suspensions 12, 14) with respect to the sprung portion (i.e., body 16) of vehicle 10. While the vehicle 10 has been depicted as a passenger car having front and rear axle assemblies, the damper system 20 may be used with other types of vehicles or in other types of applications including, but not limited to, vehicles incorporating non-independent front and/or non-independent rear suspensions, vehicles incorporating independent front and/or independent rear suspensions or other suspension systems known in the art. In addition, the damper system 20 may also be used on all wheeled and/or tracked vehicles. For example the damper system 20 may be used on two and/or three wheels type of vehicles, such as motorcycles and all-terrain vehicles.
Referring now to
In the example embodiment described herein, the damper system 20 is described and depicted as including a twin tube electrically adjustable shock absorber. It is readily understood that the damper system 20 may include other types of electrically adjustable hydraulic shock absorber and is not limited to the shock absorber described herein. For example, the damper system 20 may include an electrically adjustable shock absorber having a mono-tube configuration, a triple-tube configuration, or any other suitable shock absorber design known in the art. Furthermore, in the following description, the shock absorber is connected to the sprung and unsprung portions of the vehicle as a non-inverted shock absorber. It is readily understood that the present disclosure is further applicable to inverted shock absorbers, which differ in the manner in which it is connected to the sprung and unsprung portions of vehicle.
The pressure tube 36 defines a working chamber 44. The piston assembly 38 is slidably disposed within the pressure tube 36 and divides the working chamber 44 into an upper working chamber 46 and a lower working chamber 48.
The piston rod 39 is attached to the piston assembly 38 and extends through the upper working chamber 46 and through a rod guide assembly 50 which closes the upper end of the pressure tube 36. The end of the piston rod 39 opposite to the piston assembly 38 is adapted to be secured to the sprung mass of the vehicle 10.
Valving within the piston assembly 38 controls the movement of fluid between the upper working chamber 46 and the lower working chamber 48 during movement of the piston assembly 38 within the pressure tube 36. Since the piston rod 39 extends through the upper working chamber 46 and not the lower working chamber 48, movement of the piston assembly 38 with respect to the pressure tube 36 causes a difference in the amount of fluid displaced in the upper working chamber 46 and the amount of fluid displaced in the lower working chamber 48. The fluid displaced may flow through the base valve assembly 42, the piston assembly 38, or a combination thereof.
The reserve tube 40 surrounds the pressure tube 36 to define a fluid reservoir chamber 52 located between tubes 40 and 36. The bottom end of the reserve tube 40 is closed by a base cup 54 which can be connected to the unsprung mass of vehicle 10. The upper end of reserve tube 40 is attached to the rod guide assembly 50. The base valve assembly 42 is disposed between the lower working chamber 48 and the reservoir chamber 52 to control the flow of fluid between chambers 48 and 52. When the shock absorber 30 extends in length, an additional volume of fluid is needed in the lower working chamber 48. Thus, fluid may flow from the reservoir chamber 52 to the lower working chamber 48 through, for example, the base valve assembly 42. When the shock absorber 30 compresses in length, an excess of fluid must be removed from the lower working chamber 48, and therefore, fluid may flow from the lower working chamber 48 to the reservoir chamber 52 through the base valve assembly 42, the piston assembly 38, or a combination thereof.
The shock absorber 30 may include one or more electromechanical valves 34. The electromechanical valve 34 may be a digital valve, a variable state valve, or other suitable electromechanical valves. The electromechanical valve 34 may include a coil that controls the actuation of the electromechanical valve 34. More particularly, when power is supplied to the electromechanical valve 34, the coil creates a magnet field that actuates the electromechanical valve 34. The actuation of the electromechanical valve 34 controls the flow of fluid within the shock absorber 30. For example, the electromechanical valve 34 may control the flow of fluid between the upper working chamber 46 and the reservoir chamber 52.
While in the example embodiment the electrically adjustable hydraulic shock absorber is provided as having an electromechanical valve 34, the present disclosure is also applicable to electrically adjustable hydraulic shock absorbers that do not require an electromechanical valve. For example, the present disclosure is applicable to an electrically adjustable hydraulic shock absorber that uses magneto-rheological and electro-rheological damping technologies.
With reference to
The DM 32 may receive a damper setting from a master module 90 disposed in the vehicle 10. More particularly, the DM 32 is communicably coupled to the master module 90 via a communication network. The master module 90 transmits data as an electronic signal via the communication network. The electronic signal may be an analog signal, a pulse width modulated (PWM) signal, CAN, LIN, or other type of signal/digital signal protocol known in the art. Based on the damper setting, the DM 32 controls the electromechanical valve(s) 34 disposed within the shock absorber 30, such that the shock absorber 30 operates at a target damping state.
With reference to
The damping state module 104 determines a control operation for operating the shock absorber 30 at the target damping state based on the data received from the signal module 102. For example, based on the damper setting, the damping state module 104 determines a damping state of the shock absorber 30 and then controls actuation of the electromechanical valve 34 to operate the shock absorber 30 at the damping state determined. Similarly, if multiple electromechanical valves are disposed within the shock absorber 30, the damping state module 104 determines the appropriate activation/deactivation of each of the valves 34.
The damping state module 104 provides a control signal to the coil activation module 106 which in return controls the electrical power provided to a coil of the electromechanical valve 34. More particularly, the coil activation module 106 determines the inputs for a coil drive, as discussed below.
The diagnostic module 108 monitors the operation of the coil activation module 106 and the electromechanical valve 34 for any faults/failures. If a fault is detected the diagnostic module 108 may notify the damping state module 104. The damping state module 104 may then control the shock absorber 30 to a predetermined operation state.
As provided above, information regarding the fault may also be transmitted to a device external of the DM 32. For example, the diagnostic module 108 may transmit data regarding the fault to the signal module 102 which transmits the data to the master module 90.
In operation, the DM 32 controls the damping state of the electrically adjustable hydraulic shock absorber 30. The DM 32 is disposed within the housing 100 as an integrated electronic system. Specifically, as shown in
With reference to
As the coil activation module 106, the microcontroller 202 determines an input for each of the coil drivers 204A-204D. As power drive electronics, the coil drivers 204A-204D control current to, for example, the electromechanical valves based on the input (i.e., signal) from the microcontroller 202. While in the example embodiment four coil drivers are shown, it is readily understood that one or more coil drivers may be used based on the number of electromechanical valves/coils disposed within the shock absorber 30. Specifically, each electromechanical valve has a dedicated coil driver.
As the diagnostic module 108, the microcontroller 202 may monitor the electrical current powering each electromechanical valve 34 as it responds to a command to change the damper setting. Accordingly, the microcontroller 202 can monitor the electrical current levels to ensure that the electrical components, such as the coil drivers 204A-204D and electromechanical valve coils, are working properly. Comparing the electrical current level to predetermined limits ensures coil drivers 204A-204D (i.e., the power drive electronics) are not experiencing a fault such as a short circuit, open circuit, temperature extreme, or other fault.
Additionally, with additional logic, the transient current profile, when recorded over time, can indicate the mechanical state of the electromechanical valve. As the electromechanical valve moves from the energized state to the unenergized state and vice versa, changes in the inductance of the electromechanical valve affect the electrical current. Inspection of this electrical current profile can, thus, determine the mechanical state of the electromechanical valve 34 as well as the electrical state.
The transceiver 206 may be provided as a LIN transceiver, CAN Bus, or Communication Bus. The transceiver communicably couples the PCBA 200 to the communication bus provided as the communication link between the DM 32 and devices external of the DM 32, such as the master module 90. The communication bus may be a LIN bus 209 which is external of the PCBA 200.
The PCBA 200 may also include a high side driver 208, a PWM input 210, a timer 212, a voltage regulator 214, a protection circuit 216, and a temperature sensor 218. The high side driver 208 is electrically coupled to each of the coil drivers 204A-204D. The high side driver 208 acts like a master switch for controlling the power supply to each of the coil drivers 204A-204D. The PWM input 210 may be provided as an alternative communication link (reference number 222 in
The temperature sensor 218 detects the ambient temperature of the PCBA 200. The temperature sensor 218 provides the information to the microcontroller 202. The microcontroller 202 may then determine the proper operation of the damper system 20 based on the temperature detected. Accordingly, the components disposed on the PCBA 200 are protected from extreme temperatures.
The PCBA 200 receives power from a vehicle battery. The voltage regulator 214 conditions the electrical power from the vehicle battery to a voltage level suitable for the components on the PCBA 200. The protection circuit 216 may be provided as a battery line load dump transient and reverse voltage protection circuit. The protection circuit protects the components of the PCBA 200 from electrical transients which could damage or disrupt proper operation of the components on the PCBA 200.
The PCBA 200 may couple to the power supply and the communication bus via a connector 201 (
With reference to
With reference to
With reference to
With reference to
The lead frame 250 couples the PCBA 200 to the electromechanical valve. For example, the lead frame 250 couples the coil driver disposed on the PCBA 200 to an end of the electromagnetic valve 34 that is farthest from the rod guide assembly 50. Thus, the configuration has an inverted arrangement.
With reference to
With reference to
The cap 382 may or may not be a load bearing structure. Specifically the PCBA 200 has a ring like structure, such that the piston rod 39 (not shown) may extend through both the PCBA 200 and the cap 382. Furthermore, the PCBA 200 is electrically coupled to an electromechanical valve disposed within a valve cavity 386. Based on the distance between the PCBA 200 and the electromechanical valve, the PCBA 200 may be directly connected to the electromechanical valve or may be indirectly connected via, for example, a lead frame.
With reference to
A bumper cap assembly 600 is attached to a shock absorber 530. The bumper cap assembly 600 is positioned between a rod guide assembly 550 of the shock absorber 530 and a jounce bumper 602. The jounce bumper 602 is a rubber or elastomeric component that is positioned on a piston rod 539.
With reference to
The bumper cap 604 has an annular cover 616 and a cylindrical body 618. The annular cover 616 defines an aperture 620 for receiving the piston rod 539 of the shock absorber 530. A column 622 extends from the aperture 620.
The bumper cap 604 includes an outer shoulder 624, an inner shoulder 626, and multiple inner ribs 628. The outer shoulder 624 circumferentially extends from an inner surface 630 of the cylindrical body 618. The outer shoulder 624 abuts against the rod guide assembly 550.
The inner shoulder 626 is formed at the end of the column 622. In the assembled condition, a clearance gap is defined between the inner shoulder 626 and the rod guide assembly 550 of the shock absorber 530. During a jounce load, a compressive force is exerted onto the bumper cap 604. As a result, the inner shoulder 626 moves downward and abuts against the rod guide assembly 550, thereby eliminating the clearance gap.
The inner ribs 628 radially extend from the column 622 to the inner surface 630 of the cylindrical body 618, and are disposed along an inner surface 632 of the annular cover 616. The inner ribs 628 provide a continuous transition between the inner shoulder 626 and the outer shoulder 624. The inner ribs 628, the inner shoulder 626 and the outer shoulder 624 control the deflection of the bumper cap 604, such that the bumper cap 604 does not collapse onto the electronic isolator assembly 608 disposed within. More particularly, the outer shoulder 624 maintains contact with the shock absorber 530 during loaded and unloaded operating conditions. The inner shoulder 626 contacts the shock absorber 530 during loaded operating conditions. The inner ribs 628 reinforce the cylindrical body 618 by distributing and absorbing compressive forces placed on the cylindrical body 618.
The bumper cap 604 also includes a snap member 634 formed along an upper inner surface 635 of the cylindrical body 618 (
The bumper cap 604 further defines a seal cavity 636 at the annular cover 616, and includes a retainer 638. The dirt wiper 606 is positioned within the seal cavity 636 and is retained by the retainer 638. The dirt wiper 606 prevents water and dirt from entering the bumper cap 604 by creating a seal between the piston rod 539 and the bumper cap 604. The retainer 638 is fixedly attached to the cylindrical body 618 by way of, for example, ultra-sonic welding, adhesives, and/or other locking methods. Alternatively, instead of a two piece configuration, the bumper cap 604 may be purely one piece design in which the dirt wiper 606 is pressed fit into the seal cavity. Such one piece configuration removes the need for a separate component, but may require secondary machining operations of the seal cavity.
The bumper cap 604 defines a plurality of grooves 640 along an outer surface 642 of the annular cover 616. The groove 640 extends radially outward from the aperture 620. The grooves 640 remove water and dirt that has been blocked by the dirt wiper 606, thereby preventing the foreign debris from accumulating at the annular cover 616. The groove 640 also prevents air from being trapped between the jounce bumper 602 and the bumper cap 604 during deflection, thereby preventing noise or pressurization of the bumper cap interior.
The bumper cap 604 includes a plurality of outer ribs 644 protruding from an outer surface 646 of the cylindrical body 618. The outer ribs 644 extend along an axis parallel with a longitudinal axis of the cylindrical body 618. The outer ribs 644 reinforce the sides of the cylindrical body 618. More particularly, the thickness of the cylindrical body 618 between the outer ribs 644 is thinner than at the outer ribs 644. This allows the bumper cap 604 to stretch over the rod guide assembly 550, while the outer ribs 644 restrain the sides of the cylindrical body 618 from expanding when compressive forces are placed on the bumper cap 604.
A lower seal 648 is positioned at a brim 650 of the cylindrical body. The lower seal 648 is an environmental seal that prevents debris from entering the bumper cap assembly 600. The lower seal 648 interfaces with an outer surface of the rod guide assembly 550. In the example embodiment, the lower seal 648 is provided as a separate component that is arranged within an opening 652 defined by the brim 650. Alternatively, the bumper cap 604 may include multiple lips, as the lower seal. For example, the lips are molded circumferentially along the inner surface 630 of the cylindrical body 618 at the brim 650.
The bumper cap 604 receives the gasket 610, the PCBA 612, and the isolator 614 (i.e., the electronic isolator assembly 608) via the opening 652. The gasket 610, the PCBA 612, and the isolator 614 are disposed in a gap 654 defined by the annular cover 616, the column 622, and the cylindrical body 618. The gasket 610 holds and isolates the PCBA 612. Specifically, the gasket 610 interfaces with an outer portion of the PCBA 612 to hold down the PCBA 612 and maintain the position of the PCBA 612, such that the PCBA 612 does not move within the gap 654.
The PCBA 612 is substantially similar to the PCBA 200. The PCBA 612 includes a connector 656, which is substantially similar to connector 201, and multiple terminals 658. The terminals 658 extend into the rod guide assembly 550 to engage with solenoids (not shown) disposed in the rod guide assembly. The PCBA 612 electrically powers the solenoids via coil drivers in order to actuate the electromagnetic valves 34 of the shock absorber 530.
The isolator 614 isolates the vibrations experienced by the PCBA 612, and also aligns the terminals 658 with the solenoids. Specifically, the isolator includes a port 660 for each of the terminals 658 of the PCBA 612. The ports 660 receive and maintain the position of the terminals 658. In the assembled condition, the ports 660 align with the terminals of the solenoids disposed in the rod guide assembly 550. The terminals 658 are configured to receive the terminals of the solenoids.
To properly align the components of the bumper cap assembly 600 with each other and with the shock absorber 530 various alignment features may be used. For example, the isolator 614 may include one or more tabs 662 that extend from an outer parameter of the isolator 614. The bumper cap 604 defines corresponding notches 664 which align with the tabs 662. The tabs 662 and the notches 664 also prevent the isolator 614 from moving within the gap 654.
The connector 656 also acts as an alignment feature. For example, the gasket 610 includes a lid 666 which aligns with and covers the connector 656. Isolator 614 includes a bracket 668 which aligns and engages with the connector 656. The bumper cap 604 defines a slot 670 which aligns with and receives the connector 656.
In the example embodiment, the electronic isolator assembly is provided as separate components which include the gasket 610, the PCBA 612, and the isolator 614. Alternatively, the gasket 610, the PCBA 612, and the isolator 614 may be encapsulated as a single component that is positioned in the bumper cap 604. For example,
In another variation, the solenoids originally positioned within the rod guide assembly, can be part of the bumper cap assembly. For example,
The bumper cap arrangement 500 houses the PCBA within the bumper cap 604 which is load bearing structure. The bumper cap assembly 600 includes two seals (e.g., the dirt wiper 606 and the lower seal 648) which prevent debris and water from entering the bumper cap 604, thereby protecting the PCBA 612. The interior space of the bumper cap 604 is utilized to house the electronics of the damping system 520, thereby creating a single unit that can be assembled onto the shock absorber 530.
The bumper cap 604 is a rigid interface between the jounce bumper 602 and the body of the shock absorber and transfers loads to the body of the shock absorber during extreme jounce loads. For example, the walls of the cylindrical body provide structural support by alleviating bending stress placed on the column 622 and the inner ribs 628. The compressive load is evenly distributed between the cylindrical body 618 and the column 622 for optimum rigidity against loading. The outer ribs 644 provided along the outer wall of the cylindrical body 618 prevent geometric instability in the bumper cap 604 by restraining the lower portion of the cylindrical body 618 from expanding, thereby reducing strain and radial deflection of the brim 650 of the bumper cap 604 and maintaining engagement with the shock absorber.
As provided above, the present disclosure is also applicable to electrically adjustable hydraulic shock absorbers that do not include an electromagnetic valve. For example, if the shock absorber utilizes magneto-rheological and electro-rheological damping technologies, the damping module may operate the shock absorber using known methods that utilize the magneto-rheological and electro-rheological damping technologies. Accordingly, instead of the electromechanical valve, the PCBA controls the current supplied to a coil disposed within the shock absorber.
As provided above, the PCBA is an integrated electronic system that electrically powers coil(s) to create a magnetic field. The magnetic field actuates the electromechanical valve (i.e., a hydraulic valve), thereby adjusting the damping characteristic of the shock absorber. By integrating an electronics system with the electrically adjustable hydraulic shock absorber, the complexity of a vehicle damping system/suspension system is reduced. In essence, each damper system 20 includes its own power drive electronics for controlling the damping state of the shock absorber 30.
As best shown in
PCBA housing 704 includes a carrier or lower housing 750 and a lid 754. Each of lower housing 750 and lid 754 are molded from a plastic material such as PA66 injection grade nylon. Lower housing 750 may be colored black while lid 754 is colored white to assist with laser welding. Lid 754 includes a substantially planar bottom surface 756 bounded by an inner recess 758 and an outer recess 760. Lower housing 750 is cup-shaped including an outer wall 764 and an inner wall 766 interconnected by a bottom wall 790. Distal end surfaces of inner wall 766 and outer wall 764 mate with surfaces of lid 754 defining recesses 758 and 760. A 360 degree laser weld, or a similar bonding method, sealingly fixes lid 754 to lower housing 750.
Lid 754 includes a circumferentially extending groove 770 in receipt of a seal 772. Cap 714 includes a surface 774 defining a pocket in receipt of at least a portion of PCBA housing 704. Seal 772 is placed in biased engagement with surface 774. As best shown in
Lower housing 750 includes a pocket 780 in receipt of PCBA 718. Lands 784, 786 are formed on outer wall 764 and inner wall 766, respectively, to support PCBA 718. Each solenoid terminal housing 734 includes a first portion 788 extending downwardly from bottom wall 790 that at least partially defines pocket 780. A second portion 792 of each solenoid terminal housing 734 extends on the opposite side of bottom wall 790. As previously described, each multiple-ridge terminal seal 738 surrounds first portion 788 of solenoid terminal housing 734. Upper surfaces 793 of each solenoid terminal housing 734 also provide support for PCBA 718.
Alignment pins 730 and first portions 788 of solenoid terminal housings 734 are integrally formed with lower housing 750 and axially protrude from bottom wall 790. Outer wall 764 extends a sufficient length to sealingly engage o-ring 746. Snap fingers 710 are integrally formed with and axially extend from outer wall 764. Snap fingers 710 are circumferentially spaced apart as well as sized and shaped to lock into a groove 794 formed on an external surface of rod guide 708. Each snap finger 710 also includes an integrally molded secondary locking feature which interfaces with cap 714 to maintain engagement of snap fingers 710 with groove 794 of rod guide 708. The secondary locking feature may include a small bump or protrusion 797 that interfaces with bumper cap 714.
It should be appreciated that many of the features described in relation to shock absorber 700 pertain to improving the robustness of an electronically controller shock absorber when considering the harsh environment in which the shock absorber is placed. Sealing electronics from the environment is a priority. Shock absorber 700 includes an integrated connection system which allows PCBA 718 to be electrically connected to a source of power, a number of inputs such as sensors or controllers and various outputs. The present disclosure describes fully sealed connections. Shock absorber 700 also includes a unique set of features for retaining PCBA housing 704 to the top of shock absorber 700 to assure that PCBA housing 704 does not become disconnected from the shock absorber during use that may lead to an interrupted electric connection between PCBA 718 and solenoid 726.
The sealing system includes positioning of PCBA 718 within sealed PCBA housing 704 as previously described. It should also be appreciated that prior to laser welding lid 754 to lower housing 750, PCBA 718 may be encapsulated by a thermally conductive and compliant material positioned within pocket 780. The thermally conductive and compliant material may be positioned on opposite sides of PCBA 718 to aid in heat dissipation, vibration isolation, and provide another sealing method.
An alternate arrangement (not shown) may only require lower housing 750 and the thermally conductive and compliant encapsulation material without the use of lid 754. The encapsulation material may extend proximate to surface 774 of bumper cap 714 and may be generally shaped as lid 754.
To further increase the resistance to contaminant ingress, a dual terminal sealing system has been integrated into PCBA housing 704. A primary seal includes o-ring 746, seal 772, and a wiper seal 800. Wiper seal 800 includes a first lip 804 and may include a second lip 806 placed into biased engagement with an axially movable rod 810. Wiper seal 800 includes a radially outwardly extending flange 814 positioned and retained within an internal circumferentially extending groove 816 of bumper cap 714. The primary seal set restricts contaminants from reaching solenoid terminal housings 734.
A second seal set includes three multiple-ridge terminal seals 738. Each terminal seal 738 surrounds one solenoid terminal housing 734 and biasedly engages an inner cylindrical wall 820 of rod guide 708.
As best shown in
As the assembly of PCBA housing 704 to rod guide 708 continues, snap fingers 710 are radially outwardly deflected and tabs 796 are axially translated past a lip 798 of rod guide 708. Further axial translation of PCBA housing 704 results in tabs 796 snapping into groove 794 thereby fixing PCBA housing 704 to rod guide 708. Protrusions 797 are positioned to engage or be very closely spaced apart from bumper cap 714 after the cap is assembled over PCBA housing 704. The close spacing between protrusions 797 and bumper cap 714 restricts snap fingers 710 from bending and possibly allowing tabs 796 to become dislodged from groove 794. A robust coupling and retention system is provided.
After PCBA housing 704 has been coupled to rod guide 708, jumper harness 722 may be axially inserted within connector receptacle 742 to electrically couple jumper harness 722 to electrical terminal 860. A portion of connector receptacle 742 is configured as a deformable lock tab 874. Jumper harness 722 includes a catch 878 which cooperates with lock tab 874 to retain jumper harness 722 in electrical engagement with electrical terminals 860 during operating of shock absorber 700. A user may deflect lock tab 874 to separate jumper harness 722 from PCBA housing 704, if desired.
Shock absorber 900 also includes an electronically-controlled valve (not shown in
Shock absorber 900 incorporates a bumper cap assembly 901. Bumper cap assembly 901 includes a carrier housing 904. Carrier housing 904 defines an aperture 909 that partially receives piston rod. Carrier housing 904 engages with rod guide 903 and is disposed above rod guide 903. Carrier housing 904 serves to receive a circuit board 902 of bumper cap assembly 901 at a top portion of shock absorber 900 and protects circuit board 902 from outside environment. More particularly, circuit board 902 is positioned around piston rod. Circuit board 902 is similar to PCBA 200 explained in relation to
Circuit board 902 is in communication with electronically-controlled valve via at least one solenoid 905. Though only one solenoid 905 is illustrated in
It should be noted that a single terminal pin 912 or multiple terminal pins 912 may be associated with a single solenoid, without limiting the scope of the present embodiment. Although a single terminal pin 912 is illustrated herein, shock absorber 900 may include a number of terminal pins 912 that may be circumferentially spaced apart from one another in a predetermined pattern. Thus, carrier housing 904 described herein allows electrical connection to be established between circuit board 902 and solenoid 905 that is located inside rod guide 903 by supporting circuit board 902 and terminal pin 912 therein.
Further, carrier housing 904 may also provide an electric connection between a jumper harness and circuit board 902. Jumper harness is similar to jumper harness 722 that is explained in relation to
In the illustrated embodiment, carrier housing 904 is embodied as a load bearing component. More particularly, when jounce loading is exerted on shock absorber 900, carrier housing 904 experiences compressive axial loads along a first load path “F1” and a second load path “F2”. Further, carrier housing 904 transfers the compressive axial loads to rod guide 903. In one example, carrier housing 904 may be molded from a plastic material such as PA66 injection grade nylon.
Carrier housing 904 includes structural features that minimize deflection and transfer energy to shock absorber 900, thereby protecting circuit board 902 and other electrical components within carrier housing 904. More particularly, carrier housing 904 includes an outer column 906 and an inner column 908. Outer column 906 is located radially outwards with respect to inner column 908. Outer column 906 may include a substantially cylindrical body. Further, inner column 908 may include a cylindrical body that is concentrically disposed with respect to outer column 906. In some embodiments, inner and outer columns 908, 906 may be integrally formed with carrier housing 904. For example, inner column 908 and outer column 906 may be integrally molded with carrier housing 904. Alternatively, inner column 908 and outer column 906 may be manufactured as separate components that are assembled with carrier housing 904, such that each of inner and outer columns 908, 906 is concentrically disposed within carrier housing 904. Further, each of inner and outer columns 908, 906 and carrier housing 904 may be made of the same material or different materials. In one example, each of inner and outer columns 908, 906 and carrier housing 904 may be made of plastic. In another example, each of inner and outer columns 908, 906 may be made of metal whereas carrier housing 904 may be made of plastic.
A bumper cap 910 of bumper cap assembly 901 is further mounted on carrier housing 904. Bumper cap 910 rests on top surfaces 929 and 931 of the inner and outer columns 908, 906, respectively, such that top surfaces 929, 931 are in contact with an inner surface 926 of bumper cap 910. Bumper cap 910 may therefore engage with inner and outer columns 908, 906.
During operation of shock absorber 900, inner and outer columns 908, 906 are subjected to compressive axial loads. More particularly, inner and outer columns 908, 906 experience compressive axial loads along first and second load paths “F1” and “F2”. During an operation of shock absorber 900, bumper cap 910 transfers compressive axial loads to inner and outer columns 908, 906 along first and second load paths “F1” and “F2” as top surfaces 929, 931 of inner and outer columns 908, 906 are in contact with inner surface 926 of bumper cap 910.
In some examples, inner and outer columns 908, 906 may be designed such that compressive axial loads are evenly distributed between inner and outer columns 908, 906 for optimum rigidity against loading. Further, a thickness of each of the inner and outer columns 908, 906 may be decided based on an amount of compressive axial loads experienced by shock absorber 900.
It should be appreciated that many of the features described in relation to shock absorber 900 pertain to improving the robustness of electrically adjustable shock absorber 900 when considering the harsh environment in which the shock absorber 900 is placed. Sealing electronics from the environment is a priority. Shock absorber 900 includes an integrated connection system which allows circuit board 902 to be electrically connected to a source of power, a number of inputs such as sensors or controllers, and various outputs. The present disclosure describes fully sealed connections.
Carrier housing 904 includes a pocket 911 that receives circuit board 902. Pocket 911 is defined between inner and outer columns 908, 906. Shock absorber 900 also includes a unique set of features for retaining circuit board 902 at the top portion of shock absorber 900 to assure that circuit board 902 does not disconnect from shock absorber 900 during use that may lead to an interrupted electric connection between circuit board 902 and solenoid 905. More particularly, this embodiment describes a sealing system that allows positioning of circuit board 902 within carrier housing 904. The sealing system includes encapsulation of circuit board 902 by a thermally conductive and compliant material 914 positioned within pocket 911. The thermally conductive and compliant material 914 is disposed on each of an upper side 923 and a lower side 924 of circuit board 902 to aid in heat dissipation, vibration isolation, and protection of circuit board 902 from contamination. On upper side 923 of circuit board 902, the thermally conductive and compliant material 914 may extend proximate to inner surface 926 of bumper cap 910.
Carrier housing 904 described in the present embodiment also aligns terminal pin 912 that connects circuit board 902 with electronically-controlled valve, via solenoid 905. Carrier housing 904 also provides lateral support to terminal pin 912 during assembly and operation of shock absorber 900. In the illustrated embodiment, terminal pin 912 directly mates or connects with circuit board 902. More particularly, terminal pin 912 extends from a top surface of rod guide 903 and is received within a receiving portion 913 of carrier housing 904. Receiving portion 913 is radially disposed between inner and outer columns 908, 906. Further, terminal pin 912 extends substantially parallel to inner and outer columns 908, 906 such that only a small portion of terminal pin 912 extends above receiving portion 913. The receiving portion 913 also provides side support for terminal pin 912 to aid in attachment of the terminal pin 912 to circuit board 902.
Receiving portion 913 includes a support section 921. As illustrated, support section 921 engages with terminal pin 912 for supporting and aligning terminal pin 912 within carrier housing 904. Receiving portion 913 also includes an opening 925 defined in a lower section 927 of receiving portion 913. Opening 925 surrounds a length “L” of terminal pin 912. Further, opening 925 is filled with a thermally conductive and compliant material 917 along length “L” of terminal pin 912 for aligning and supporting terminal pin 912 within receiving portion 913. The thermally conductive and compliant material 917 ensures that terminal pin 912 does not bend or fail during assembly and operation as terminal pin 912 is embodied as a thin and long pin. An arrangement for connection of terminal pin 912 described in this embodiment eliminates requirement of separate terminal housings or sockets that are typically disposed in carrier housing 904 for aligning and supporting terminal pin 912 within carrier housing 904. Elimination of terminal housings reduces a quantity of electrical connections in shock absorber 900, thereby simplifying a construction as well as cost associated with design and manufacturing of shock absorber 900.
Further, a thermally conductive and compliant material 915 is also disposed in counterbores 916 located above electronically-controlled valve thereby sealing electric connections. In various examples, thermally conductive and compliant material 914, 915, and 917 may include a potting compound such as thermosetting plastics, silicone rubber gels, or epoxy, without limiting the scope of present embodiment.
In some embodiments, to further increase a resistance to contaminant ingress, a sealing member 928 in the form of an O-ring may be disposed in carrier housing 904 for restricting contaminants from reaching circuit board 902. Sealing member 928 is disposed between support section 921 and rod guide 903.
Further, bumper cap assembly 901 includes bumper cap 910 that is mounted on carrier housing 904. As mentioned above, bumper cap 910 engages with the inner column 908 and the outer column 906. Bumper cap 910 slidably receives the piston rod and also encompasses carrier housing 904. Bumper cap 910 is used to cover and protect components such as carrier housing 904, circuit board 902, terminal pin 912, and/or other components of bumper cap assembly 901. Bumper cap 910 transfers externally applied compressive axial loads directly to inner and outer columns 908, 906 of carrier housing 904 which can withstand and transfer compressive axial loads to rod guide 903.
Bumper cap 910 described herein includes a simplified cross-sectional profile and is cost effective. Bumper cap 910 may be made of a plastic material or a metal. Since the bumper cap 910 is not embodied as a load bearing structure, the bumper cap 910 may be made of a low grade plastic material or a low grade metal thereby reducing cost of manufacturing shock absorber 900. Further, as bumper cap 910 includes a simplified design, bumper cap 910 may be manufactured using a low cost molding process.
In one example, bumper cap 910 includes a two piece construction. More particularly, a dirt wiper 919 is installed within bumper cap 910. Dirt wiper 919 is retained within bumper cap 910 by a retainer 918. Retainer 918 may be welded to bumper cap 910. More particularly, when bumper cap 910 is made of metal, the retainer 918 may be welded to bumper cap 910 by spot welding. Further, when bumper cap 910 is made of plastic material, retainer 918 may be welded to bumper cap 910 by sonic welding. In another example, bumper cap 910 is embodied as a unitary component such that retainer 918 and dirt wiper 919 are integrally formed with the bumper cap 910.
Bumper cap 910 may be coupled to rod guide 903 using different coupling techniques based on a material that is used to manufacture bumper cap 910. For example, when bumper cap 910 is made of metal, an outer body 920 of bumper cap 910 includes a crimp 922 that allows bumper cap 910 to couple with rod guide 903. Crimp 922 is a small bump or protrusion that interfaces with rod guide 903 for coupling and locking bumper cap 910 with rod guide 903. Further, when bumper cap 910 is made of plastic material, bumper cap 910 is coupled with rod guide 903 by a snap-fit arrangement, an interference-fit arrangement, such as a press-fit. Alternatively, bumper cap 910 may be bonded to rod guide 903. Coupling techniques described above also ensure a robust coupling and retention of bumper cap 910 with rod guide 903. More particularly, coupling techniques described above prevent removal of bumper cap 910 during operation of shock absorber 900 and further protect electronics assembly of shock absorber 900 from tampering or disassembly by an end user.
During an assembly process of shock absorber 900, rod guide 903 receives solenoid 905 with terminal pin 912 of solenoid 905 extending above top surface of rod guide 903. Further, carrier housing 904 is axially inserted and attached to rod guide 903. During attachment of carrier housing 904 with rod guide 903, receiving portion 913 assists in alignment and also guides terminal pin 912 to avoid bending of terminal pin 912. Further, the thermally conductive and compliant material 917 is disposed in opening 925 along length “L” of terminal pin 912 to encapsulate terminal pin 912 for providing rigidity and support to terminal pin 912.
As the assembly of carrier housing 904 continues, circuit board 902 is inserted into carrier housing 904 and mated with terminal pin 912. It should be noted that receiving portion 913 provides side support for terminal pin 912 when circuit board 902 is being attached to carrier housing 904. Further, carrier housing 904 is filled with thermally conductive and compliant material 914. More particularly, upper and lower sides 923, 924 of circuit board 902 are filled with thermally conductive and compliant material 914. Counterbores 916 are also filled with thermally conductive and compliant material 915 to isolate components within carrier housing 904 from rod guide 903 thereby sealing the electrical connections. Bumper cap 910 is then installed over carrier housing 904 and pressed to a positive stop against carrier housing 904 by coupling bumper cap 910 with rod guide 903.
The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
In this application, including the definitions below, the term module may be replaced with the term circuit. The term module may refer to, be part of, or include an Application Specific Integrated Circuit (ASIC); a digital, analog, or mixed analog/digital discrete circuit; a digital, analog, or mixed analog/digital integrated circuit; a combinational logic circuit; a field programmable gate array (FPGA); a processor (shared, dedicated, or group) that executes code; memory (shared, dedicated, or group) that stores code executed by a processor; other suitable hardware components that provide the described functionality; or a combination of some or all of the above, such as in a system-on-chip.
Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.
The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms “a,” “an,” and “the” may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “comprising,” “including,” and “having,” are inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
When an element is referred to as being “on,” “engaged to,” “connected to,” or “coupled to” another element, it may be directly on, engaged, connected or coupled to the other element, or intervening elements may be present. In contrast, when an element is referred to as being “directly on,” “directly engaged to,” “directly connected to,” or “directly coupled to” another element, there may be no intervening elements present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.
Although the terms first, second, third, etc. may be used herein to describe various elements and/or components, these elements and/or components should not be limited by these terms. These terms may be only used to distinguish one element or component from another. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element or component discussed could be termed a second element or component without departing from the teachings of the example embodiments.
Spatially relative terms, such as “inner,” “outer,” “beneath,” “below,” “lower,” “above,” “upper,” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the example term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
This application is a continuation-in-part of U.S. patent application Ser. No. 15/615,053 filed on Jun. 6, 2017. The entire disclosure of the above application is incorporated herein by reference.
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| Number | Date | Country | |
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| 20180370320 A1 | Dec 2018 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 15615053 | Jun 2017 | US |
| Child | 16103068 | US |
