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CN-122014811-A - Torque transmitting device, transmission assembly and vehicle

CN122014811ACN 122014811 ACN122014811 ACN 122014811ACN-122014811-A

Abstract

The present disclosure relates to a torque transfer device including a torque input assembly including a first cover disc disposed about a rotational axis, a torque output assembly including a drive disc and an output hub secured to the drive disc disposed about the rotational axis, and a hysteresis assembly configured to hysteresis relative rotation between the torque input assembly and the torque output assembly by friction. The radially innermost edge of the hysteresis assembly is spaced apart from the radially outermost edge of the output hub by a radial distance, and the drive disc is provided with one or more through-going holes between the radially innermost edge of the hysteresis assembly and the radially outermost edge of the output hub. The present disclosure also relates to a transmission assembly including such a torque transmitting device and a vehicle including such a transmission assembly.

Inventors

  • HE YUXI

Assignees

  • 南京法雷奥离合器有限公司

Dates

Publication Date
20260512
Application Date
20241112

Claims (18)

  1. 1. A torque transmitting device (100), characterized in that the torque transmitting device (100) comprises: a torque input assembly (110) disposed about an axis of rotation (X) comprising a first cover disc (10 a); a torque output assembly (120) disposed about an axis of rotation (X) comprising a drive disc (20) and an output hub (80) secured to the drive disc (20); a hysteresis assembly (2) arranged to retard relative rotation between the torque input assembly (110) and the torque output assembly (120) by friction, Wherein the radially innermost edge of the hysteresis component (2) is spaced apart from the radially outermost edge of the output hub (80) by a radial distance, and Wherein the drive disc (20) is provided with one or more through-going through-holes (23) between the radially innermost edge of the hysteresis assembly (2) and the radially outermost edge of the output hub (80).
  2. 2. The torque transmitting device (100) according to claim 1, wherein, The torque input assembly (110) is rotatable relative to the torque output assembly (120) between a zero position, a positive section and a negative section, wherein the positive section and the negative section are circumferentially located on either side of the zero position, no torque is transferred between the torque input assembly (110) and the torque output assembly (120) when the torque input assembly (110) is in the zero position, the torque input assembly (110) transfers torque to the torque output assembly (120) when the torque input assembly (110) is in the positive section, the torque output assembly (120) transfers torque to the torque input assembly (110) when the torque input assembly (110) is in the negative section, and Wherein the hysteresis component (2) comprises a first hysteresis subassembly (2 a) and a second hysteresis subassembly (2 b), Wherein the first hysteresis subassembly (2 a) generates a first hysteresis amount h1 when the relative rotation between the torque input assembly (110) and the torque output assembly (120) is less than a predetermined threshold, the first hysteresis subassembly (2 a) generates the first and second hysteresis amounts h1 and h2 when the relative rotation between the torque input assembly (110) and the torque output assembly (120) is equal to or greater than a predetermined threshold, The second hysteresis subassembly (2 b) producing a third hysteresis amount h3 when the torque input assembly (110) is in the positive-going section, and the second hysteresis subassembly (2 b) producing a fourth hysteresis amount h4 when the torque input assembly (110) is in the negative-going section, the third hysteresis amount h3 being unequal to the fourth hysteresis amount h4, Wherein, the total hysteresis quantity that hysteresis component (2) produced is: a. When the torque input assembly (110) is in a forward section and the relative rotation between the torque input assembly (110) and the torque output assembly (120) is less than a predetermined threshold, the total hysteresis amount h1=h1+h3 produced by the hysteresis assembly (2); b. When the torque input assembly (110) is in a forward section and the relative rotation between the torque input assembly (110) and the torque output assembly (120) is greater than a predetermined threshold, the total hysteresis amount h2=h1+h2+h3 produced by the hysteresis assembly (2); c. When the torque input assembly (110) is in a negative going section and the relative rotation between the torque input assembly (110) and the torque output assembly (120) is less than a predetermined threshold, the total hysteresis amount h3=h1+h4 produced by the hysteresis assembly (2); d. When the torque input assembly (110) is in a negative going segment and the relative rotation between the torque input assembly (110) and the torque output assembly (120) is greater than a predetermined threshold, the hysteresis assembly (2) produces a total hysteresis h4=h1+h2+h4.
  3. 3. The torque transmitting device (100) according to claim 2, wherein, The hysteresis assembly (2) further comprises a hysteresis spring (3) axially arranged between the first cover disc (10 a) and the drive disc (20), and The first hysteresis subassembly (2 a) comprises: -a hysteresis disc (30), said hysteresis disc (30) being locked circumferentially with respect to said first cover disc (10 a) and being arranged axially between said hysteresis spring (3) and said drive disc (20), said hysteresis spring (3) axially biasing said hysteresis disc (30) against said drive disc (20), The friction between the hysteresis disc (30) and the drive disc (20) creates the first hysteresis amount h1 upon relative rotation between the torque input assembly (110) and the torque output assembly (120).
  4. 4. The torque transmitting device (100) according to claim 3, wherein, The first hysteresis subassembly (2 a) further comprises: A stop disc (40) axially arranged between the hysteresis spring (3) and the hysteresis disc (30) and rotatable relative to the hysteresis disc (30), the stop disc (40) having a free travel in circumferential rotation relative to the drive disc (20), at the end of which free travel the stop disc (40) is stopped by the drive disc (20), Wherein the stop disc (40) follows the hysteresis disc (30) when the relative rotation between the torque input assembly (110) and the torque output assembly (120) is less than the predetermined threshold, Wherein when the relative rotation between the torque input assembly (110) and the torque output assembly (120) is equal to or greater than the predetermined threshold, the stopper disk (40) is stopped by the drive disk (20) so as to rotate relative to the hysteresis disk (30), friction between the stopper disk (40) and the hysteresis disk (30) producing a first sub-hysteresis amount h2a that constitutes at least a portion of the second hysteresis amount h 2.
  5. 5. The torque transmitting device (100) according to claim 4, wherein, The first hysteresis subassembly (2 a) further comprises a pressure plate (50) configured to be locked circumferentially with respect to the first cover disc (10 a), the pressure plate (50) being arranged axially between the hysteresis spring (3) and the stop disc (40) such that the hysteresis spring (3) axially biases the pressure plate (50) against the stop disc (40), Wherein when the relative rotation between the torque input assembly (110) and the torque output assembly (120) is equal to or greater than the predetermined threshold, the stopper disk (40) rotates relative to the pressure plate (50), and friction between the stopper disk (40) and the pressure plate (50) generates a second sub-hysteresis amount h2b that constitutes at least a portion of the second hysteresis amount h 2.
  6. 6. The torque transmitting device (100) according to claim 4 or 5, characterized in that, The stop disc (40) is provided with a first stop part, the driving disc (20) is provided with a second stop part, and when the stop disc (40) rotates to the tail end of the free stroke relative to the driving disc (20), the first stop part abuts against the second stop part.
  7. 7. The torque transmitting device (100) according to claim 6, wherein, The stop disc (40) comprises a first stop tooth (41) extending axially towards the drive disc (20), the first stop tooth (41) forming the first stop, A first stop hole (22) is arranged on the driving disc (20), the first stop hole (22) forms the second stop part, The first stopper tooth (41) is inserted into the first stopper hole (22), and the circumferential dimension of the first stopper hole (22) is larger than the circumferential dimension of the first stopper tooth (41).
  8. 8. The torque transmitting device (100) according to claim 5, wherein, The first cover disc (10 a) is provided with a first locking hole (11), the pressure disc (50) comprises a first locking column (51) extending axially towards the first cover disc (10 a) and inserted into the first locking hole (11), and the circumferential sizes of the first locking column (51) and the first locking hole (11) are approximately equal.
  9. 9. The torque transmitting device (100) according to claim 8, wherein, The pressure plate (50) is further provided with a first locking groove (52), the hysteresis disc (30) comprises a second locking column (31) which extends axially and is inserted into the first locking groove (52), and the circumferential sizes of the second locking column (31) and the first locking groove (52) are approximately equal.
  10. 10. The torque transmitting device (100) according to claim 5, wherein, The hysteresis disk (30) and/or the pressure disk (50) are made of plastic or metal, and The stop disk (40) is made of metal.
  11. 11. The torque transmitting device (100) according to any one of claims 3 to 10, The torque input assembly (110) further comprises a second cover disc (10 b) fastened to the first cover disc (10 a), the second cover disc (10 b) and the first cover disc (10 a) being located on both axial sides of the drive disc (20), respectively, and The second hysteresis subassembly (2 b) comprises A variable hysteresis disc (60) axially arranged between the second cover disc (10 b) and the drive disc (20), and A collar (70), the collar (70) being axially clamped between the variable hysteresis disc (60) and the drive disc (20), Wherein the hysteresis spring (3) axially biases the variable hysteresis disc (60) against the second cover disc (10 b) through the drive disc (20) and the collar (70), Wherein the variable hysteresis disc (60) is free to rotate relative to the drive disc (20) when the torque input assembly (110) is in the forward section, friction between the collar (70) and the drive disc (20) and/or the variable hysteresis disc (60) creating a third hysteresis amount h3, and Wherein the variable hysteresis disc (60) rotates with the drive disc (20) when the torque input assembly (110) is in the negative going section, friction between the variable hysteresis disc (60) and the second cover disc (10 b) creating a fourth hysteresis amount h4.
  12. 12. The torque transmitting device (100) according to claim 11, wherein, The torque transmitting device (100) further includes a damper spring (130) configured to be compressed circumferentially between the torque input assembly (110) and the torque output assembly (120), Wherein the drive disc (20) is provided with a spring groove (21) configured to accommodate the damper spring (130), and the variable hysteresis disc (60) comprises a first drive tooth (61) extending into the spring groove (21) at one circumferential end of the spring groove (21), Wherein, when the torque input assembly (110) is in the negative-going section, the damper spring (130) circumferentially presses the first drive tooth (61) against a circumferential end of the spring groove (21), and Wherein the damper spring (130) no longer biases the first drive tooth (61) when the torque input assembly (110) is in the forward section.
  13. 13. The torque transmitting device (100) according to claim 11, wherein, The collar (70) has a radial extension (71) and an axial extension (72), the collar (70) being axially clamped between the variable hysteresis disc (60) and the drive disc (20) by the radial extension (71), the axial extension (72) being inserted radially inside the variable hysteresis disc (60) and/or the second cover disc (10 b).
  14. 14. The torque transmitting device (100) according to claim 11, wherein, The collar (70) is made of plastic and the second cover disc (10 b) and the variable hysteresis disc (60) are made of metal.
  15. 15. A transmission assembly (1), characterized in that the transmission assembly (1) comprises: the torque transmitting device (100) according to any one of claims 1 to 14, and A torque limiter (200) comprising an input portion (210) and an output portion (220), the torque limiter (200) being configured to transfer torque from the input portion (210) to the output portion (220) that is less than a predetermined threshold, Wherein the output portion (220) of the torque limiter (200) is locked circumferentially with the torque input assembly (110) of the torque transmitting device (100).
  16. 16. The transmission assembly (1) according to claim 15, characterized in that, An input portion (210) of the torque limiter (200) is fastened to an upstream component of the transmission assembly (1) by a fastener passing through the through-hole (23).
  17. 17. The transmission assembly (1) according to claim 15 or 16, characterized in that, The torque limiter (200) further includes an inertia ring (230) secured to the input portion (210).
  18. 18. A vehicle, characterized in that it comprises a transmission assembly (1) according to any one of claims 15 to 17.

Description

Torque transmitting device, transmission assembly and vehicle Technical Field The present disclosure relates to a torque transmitting device, and a transmission assembly and a vehicle including the torque transmitting device. Background The torque produced by a vehicle engine is typically not constant and fluctuates frequently. Such non-constant torque may be transferred into the gearbox, causing vibrations of the gearbox and thus producing particularly undesirable noise or shock etc. In order to reduce the adverse effects of vibrations and to improve the driving comfort of a vehicle, it is known to equip a torque ripple absorbing mechanism in a vehicle drive train. The torque ripple absorbing mechanism may allow for limiting and absorbing ripple in torque produced by the vehicle engine. It is known that torque ripple absorbing mechanisms may include torsional vibration dampers and torque limiters. Torsional vibration dampers typically absorb and mitigate fluctuations in torque through a spring structure, while torque limiters may limit torque fluctuations beyond the maximum torque that torsional vibration dampers can allow. Torsional vibration dampers generally include a torque input portion, a torque output portion, and a spring disposed for circumferential compression therebetween. The torque input portion and the torque output portion are rotatable relative to each other, and the spring is capable of absorbing and mitigating fluctuations in torque by compression and extension. A hysteresis assembly may also be disposed in the torsional vibration damper to produce hysteresis in the torque transfer between the torque input portion and the torque output portion by friction and to dampen fluctuations in torque. Vehicles experience various conditions during use that vary with respect to the hysteresis requirements of the torsional vibration damper. For example, when the vehicle starts or turns off, the torque fluctuation generated by the engine is large, and it is desirable that the torsional damper has a large hysteresis amount to attenuate the fluctuation in torque, whereas when the vehicle is running normally, it is desirable that the torsional damper has a small hysteresis amount to improve the dynamic response sensitivity of the vehicle. The flywheel, which is fixed to the crankshaft of the vehicle engine, is an upstream component of the torque limiter in the vehicle driveline. To enhance the integration of the system, reduce component costs and assembly costs, it is known to integrate the flywheel with the torque limiter. The transmission device comprising the flywheel, the torque limiter, the torsional damper and the hysteresis component has higher integration level. However, the assembly of the various components of the transmission also interfere with each other. In particular, conventional hysteresis assemblies tend to interfere with the installation of the integrated flywheel and torque limiter. Therefore, there is a need for a torque transmission device that can be assembled easily with high integration, and has different hysteresis in different operating states, so as to meet the requirements of different operating conditions of the vehicle. Disclosure of Invention Accordingly, the present disclosure is directed to solving the above-mentioned problems, and an object thereof is to provide a torque transmission device having a structure suitable for easy assembly with high integration and having different hysteresis under different working conditions to meet the driving requirements of a vehicle. This object is achieved by a torque transmitting device according to one embodiment of the present disclosure, comprising a torque input assembly including a first cover disc disposed about a rotational axis, a torque output assembly including a drive disc and an output hub secured to the drive disc disposed about the rotational axis, and a hysteresis assembly disposed to retard relative rotation between the torque input assembly and the torque output assembly by friction. The radially innermost edge of the hysteresis assembly is spaced apart from the radially outermost edge of the output hub by a radial distance, and the drive disk is provided with one or more through-going holes between the radially innermost edge of the hysteresis assembly and the radially outermost edge of the output hub. It is an object of the present disclosure to provide a torque transmitting device that is structurally adapted for easy assembly with high integration. The torque transmitting device according to the present disclosure isolates the hysteresis assembly from the output hub at a radial distance and provides through-holes at corresponding locations of the drive disk. The fastener for assembly can pass through the through hole without interference from the hysteresis component. Thus, the torque transmitting device according to the present disclosure provides an additional assembly path through the design of the hysteresis