Torque transmission device, transmission assembly and vehicle

Abstract

The present disclosure relates to a torque transmitting device comprising: a torque input assembly disposed about an axis of rotation, comprising a first cover disc; a torque output assembly disposed about an axis of rotation, including a drive disk and an output hub secured to the drive disk; the delaying assembly is arranged to delay relative rotation between the torque input assembly and the torque output assembly through the friction effect. The radial innermost edge of the hysteresis assembly is separated from the radial outermost edge of the output hub by a certain radial distance, and the driving disc is provided with one or more through holes between the radial innermost edge of the hysteresis assembly and the radial outermost edge of the output hub. The present disclosure also relates to a transmission assembly comprising such a torque transmitting device and a vehicle comprising such a transmission assembly.

Description

Technical Field

[0001] This disclosure relates to a torque transmission device, as well as a transmission assembly and a vehicle including the torque transmission device. Background Technology

[0002] The torque generated by a vehicle engine is typically non-constant and frequently fluctuates. This non-constant torque can be transmitted to the gearbox, causing gearbox vibration and thus generating particularly undesirable noise or impacts. To reduce the adverse effects of vibration and improve vehicle driving comfort, it is known to equip the vehicle's drivetrain with torque fluctuation absorption mechanisms. Torque fluctuation absorption mechanisms can limit and absorb fluctuations in the torque generated by the vehicle engine. It is known that torque fluctuation absorption mechanisms can include torsional dampers and torque limiters. Torsional dampers typically absorb and mitigate torque fluctuations through a spring structure, while torque limiters can limit torque fluctuations exceeding the maximum torque that the torsional damper can tolerate.

[0003] A torsional damper typically includes a torque input section, a torque output section, and a spring arranged circumferentially between them. The torque input and output sections can rotate relative to each other, and the spring absorbs and reduces torque fluctuations through compression and extension. Hysteresis components may also be incorporated into the torsional damper to hysteresis the torque transmission between the torque input and output sections through friction, and to attenuate torque fluctuations. Vehicles experience various operating conditions during use, each requiring different levels of hysteresis from the torsional damper. For example, during vehicle start-up or shutdown, the engine generates significant torque fluctuations, requiring a large hysteresis in the torsional damper to attenuate these fluctuations. Conversely, during normal vehicle operation, a small hysteresis is desired to improve the vehicle's dynamic response sensitivity.

[0004] The flywheel, fixed to the crankshaft of the vehicle engine, is the upstream component of the torque limiter in the vehicle's drivetrain. To enhance system integration and reduce component and assembly costs, it is known to integrate the flywheel with the torque limiter. Drivetrains that include the flywheel, torque limiter, torsional damper, and hysteresis assembly have a high degree of integration. However, the assembly of the various components of the drivetrain can interfere with each other. In particular, conventional hysteresis assemblies can easily interfere with the installation of the integrated flywheel and torque limiter.

[0005] Therefore, there is an urgent need for a torque transmission device that can be easily assembled with high integration and has different hysteresis under different working conditions to meet the needs of different vehicle operating conditions. Summary of the Invention

[0006] Therefore, this disclosure aims to solve the above-mentioned problems and provides a torque transmission device with a structure suitable for easy assembly under high integration and with different hysteresis under different operating conditions to meet vehicle driving requirements.

[0007] The objective is achieved by a torque transmission device according to an embodiment of the present disclosure, the torque transmission device comprising: a torque input component disposed about a rotation axis, including a first cover plate; a torque output component disposed about a rotation axis, including a drive plate and an output hub fastened to the drive plate; and a hysteresis component configured to hysteresis the relative rotation between the torque input component and the torque output component by friction. The innermost radial edge of the hysteresis component is separated from the outermost radial edge of the output hub by a certain radial distance, and the drive plate has one or more through holes between the innermost radial edge of the hysteresis component and the outermost radial edge of the output hub.

[0008] One objective of this disclosure is to provide a torque transmission device with a structure suitable for convenient assembly in a highly integrated manner. According to this disclosure, the torque transmission device isolates the hysteresis component from the output hub at a certain radial distance and provides a through-hole at a corresponding position on the drive disc. Fasteners used for assembly can pass through the through-hole without being interfered with by the hysteresis component. Therefore, the torque transmission device according to this disclosure provides additional assembly paths through the design of the hysteresis component and drive disc, enabling convenient assembly in a highly integrated manner.

[0009] The torque transmission device according to this disclosure may also have one or more of the following features, individually or in combination.

[0010] According to one embodiment of this disclosure, the torque input component is rotatable relative to the torque output component between a zero position, a positive segment, and a negative segment, wherein the positive segment and the negative segment are located on opposite sides of the zero position in the circumferential direction; when the torque input component is at the zero position, no torque is transmitted between the torque input component and the torque output component; when the torque input component is in the positive segment, the torque input component transmits torque to the torque output component; when the torque input component is in the negative segment, the torque output component transmits torque to the torque input component, and wherein the hysteresis component includes a first hysteresis sub-component and a second hysteresis sub-component. The two hysteresis sub-components are configured such that when the relative rotation between the torque input component and the torque output component is less than a predetermined threshold, the first hysteresis sub-component generates a first hysteresis amount h1; when the relative rotation between the torque input component and the torque output component is greater than the predetermined threshold, the second hysteresis sub-component generates the first hysteresis amount h1 and the second hysteresis amount h2; when the torque input component is in the positive segment, the second hysteresis sub-component generates a third hysteresis amount h3; and when the torque input component is in the negative segment, the second hysteresis sub-component generates a fourth hysteresis amount h4. The third hysteresis amount h3 and the fourth hysteresis amount h4 are not equal.

[0011] One objective of this disclosure is to provide a torque transmission device that exhibits different hysteresis values ​​under various operating conditions to meet vehicle driving requirements. The torque transmission device according to this disclosure includes a first hysteresis sub-assembly and a second hysteresis sub-assembly. Depending on the relative circumferential position and relative rotation magnitude between the torque input assembly and the torque output assembly, the first and second hysteresis sub-assemblies can generate different hysteresis values, causing the total hysteresis of the torque transmission device to vary and thus satisfying the hysteresis requirements of the torque transmission device under different vehicle operating conditions.

[0012] According to one embodiment of this disclosure, the hysteresis assembly further includes a hysteresis spring axially arranged between the first cover plate and the drive plate, and the first hysteresis sub-assembly includes a hysteresis disk, which is circumferentially locked relative to the first cover plate and axially arranged between the hysteresis spring and the drive plate, the hysteresis spring axially biasing the hysteresis disk onto the drive plate. During relative rotation between the torque input assembly and the torque output assembly, friction between the hysteresis disk and the drive plate generates the first hysteresis amount h1.

[0013] Based on the above characteristics, the hysteresis disk rotates with the torque input component and is biased onto the drive disk. Therefore, whenever there is relative rotation between the torque input component and the torque output component, the hysteresis disk will rotate relative to the drive disk and generate friction, thereby producing a first hysteresis amount h1.

[0014] According to one embodiment of this disclosure, the first hysteresis sub-assembly further includes: a stop plate axially arranged between the hysteresis spring and the hysteresis disk and rotatable relative to the hysteresis disk, the stop plate having a circumferential free travel relative to the drive plate, at the end of the free travel, the stop plate being stopped by the drive plate. When the relative rotation between the torque input assembly and the torque output assembly is less than the predetermined threshold, the stop plate rotates with the hysteresis disk. Specifically, when the relative rotation between the torque input assembly and the torque output assembly is equal to or greater than the predetermined threshold, the stop plate is stopped by the drive plate, thereby rotating relative to the hysteresis disk, and the friction between the stop plate and the hysteresis disk generates a first sub-hysteresis h2a constituting at least a portion of the second hysteresis h2.

[0015] Based on the above characteristics, the first sub-hysteresis h2a of the second hysteresis h2 is generated only when the relative rotation between the torque input component and the torque output component is large. This large relative rotation occurs when there are large fluctuations in the torque to be transmitted by the torque transmission device. For example, when the vehicle starts or stops, the torque output by the engine fluctuates greatly, and the relative rotation between the torque input component and the torque output component exceeds a predetermined threshold. By generating the first sub-hysteresis h2a of the second hysteresis h2, the total hysteresis of the hysteresis component increases, thereby rapidly damping vibration. When the vehicle is driving normally, the torque output by the engine fluctuates relatively little, and the torque input component rotates back and forth within a small angular range relative to the torque output component, making the relative rotation between them less than the predetermined threshold. At this time, the hysteresis component no longer generates the first sub-hysteresis h2a, which reduces the energy consumption of the torque transmission device, improves the response speed of the torque transmission device to torque changes, and thus improves the dynamic response sensitivity of the vehicle.

[0016] According to one embodiment of this disclosure, the first hysteresis sub-assembly further includes a pressure plate configured to be circumferentially locked relative to the first cover plate. The pressure plate is axially arranged between the hysteresis spring and the stop plate, such that the hysteresis spring axially biases the pressure plate onto the stop plate. When the relative rotation between the torque input assembly and the torque output assembly is equal to or greater than the predetermined threshold, the stop plate rotates relative to the pressure plate, and the friction between the stop plate and the pressure plate generates a second sub-hysteresis h2b that constitutes at least a portion of the second hysteresis h2. By setting the pressure plate, friction is generated on both sides of the stop plate, thereby increasing the second hysteresis h2 and further increasing the amplitude of the total hysteresis of the hysteresis assembly as a function of torque fluctuations, adapting to different driving conditions of the vehicle.

[0017] According to one embodiment of this disclosure, the stop plate is provided with a first stop portion, and the drive plate is provided with a second stop portion. When the stop plate rotates relative to the drive plate to the end of the free travel, the first stop portion abuts against the second stop portion. That is, the stop of the stop plate by the drive plate is achieved by the first stop portion abutting against the second stop portion.

[0018] According to one embodiment of this disclosure, the stop plate includes a first stop tooth extending axially toward the drive plate, the first stop tooth forming a first stop portion. The drive plate has a first stop hole forming a second stop portion. The first stop tooth is inserted into the first stop hole, and the circumferential dimension of the first stop hole is larger than the circumferential dimension of the first stop tooth. Due to the aforementioned dimensional arrangement of the first stop hole and the first stop tooth, the first stop tooth can freely rotate a certain angle within the first stop hole, forming a free travel distance between the stop plate and the drive plate.

[0019] According to one embodiment of this disclosure, the first cover plate is provided with a first locking hole, and the pressure plate includes a first locking pin that extends axially toward the first cover plate and is inserted into the first locking hole, the circumferential dimensions of the first locking pin and the first locking hole being approximately equal.

[0020] According to one embodiment of this disclosure, the pressure plate is further provided with a first locking groove, and the hysteresis plate includes a second locking post that extends axially and is inserted into the first locking groove, the circumferential dimensions of the second locking post and the first locking groove being approximately equal.

[0021] According to one embodiment of this disclosure, the hysteresis plate and / or the pressure plate are made of plastic or metal, and the stop plate is made of metal.

[0022] According to one embodiment of this disclosure, the torque input assembly further includes a second cover plate fastened to the first cover plate, the second cover plate and the first cover plate being located on opposite axial sides of the drive plate, and the second hysteresis sub-assembly including a variable hysteresis disk axially arranged between the second cover plate and the drive plate; and a collar axially clamped between the variable hysteresis disk and the drive plate. The hysteresis spring axially biases the variable hysteresis disk onto the second cover plate via the drive plate and the collar. When the torque input assembly is in the positive section, the variable hysteresis disk can rotate freely relative to the drive plate, and the friction between the collar and the drive plate and / or the variable hysteresis disk generates a third hysteresis amount h3. When the torque input assembly is in the negative section, the variable hysteresis disk rotates together with the drive plate, and the friction between the variable hysteresis disk and the second cover plate generates a fourth hysteresis amount h4.

[0023] According to one embodiment of this disclosure, the torque transmission device further includes a damping spring configured to compress circumferentially between the torque input component and the torque output component. The drive disk has a spring groove configured to receive the damping spring, and the variable hysteresis disk includes a first drive tooth extending into the spring groove at one circumferential end. When the torque input component is in the negative direction, the damping spring circumferentially presses the first drive tooth against the circumferential end of the spring groove. When the torque input component is in the positive direction, the damping spring no longer biases the first drive tooth.

[0024] According to one embodiment of the present disclosure, the collar has a radial extension and an axial extension, the collar being axially clamped between the variable hysteresis disk and the drive disk via the radial extension, the axial extension being inserted radially inside the variable hysteresis disk and / or the second cover disk.

[0025] According to one embodiment of this disclosure, the collar is made of plastic, and the second cover plate and the variable hysteresis disk are made of metal. Thus, the friction between the second cover plate and the variable hysteresis disk is metal-to-metal friction, which has a large coefficient of friction and can generate a large fourth hysteresis amount h4.

[0026] This disclosure also relates to a transmission assembly including a torque transmission device and a torque limiter as described above, including an input portion and an output portion, the torque limiter being configured to transmit a torque less than a predetermined threshold from the input portion to the output portion, wherein the output portion of the torque limiter is circumferentially locked to the torque input component of the torque transmission device.

[0027] According to one embodiment of this disclosure, the input portion of the torque limiter is fastened to the upstream component of the transmission assembly by a fastener passing through the through-hole.

[0028] According to one embodiment of this disclosure, the torque limiter further includes an inertia ring fixed to the input portion. This inertia ring has a large moment of inertia, acting as a flywheel. In other words, the torque limiter is integrated with the flywheel.

[0029] This disclosure also relates to a vehicle that includes the transmission component described above. Attached Figure Description

[0030] The above and other features and advantages of this disclosure will become more apparent from the following detailed description of exemplary embodiments taken in conjunction with the accompanying drawings, which are for illustrative purposes only and are not intended to limit the scope of this disclosure in any way. The following drawings are not intentionally drawn to scale with actual dimensions; their focus is on illustrating the gist of this disclosure. In the figures:

[0031] Figure 1 This is a schematic diagram of a transmission assembly according to an embodiment of the present disclosure.

[0032] Figure 2 This is a cross-sectional view of a transmission assembly according to an embodiment of the present disclosure.

[0033] Figure 3 yes Figure 2 A magnified view of a portion of the image, showing the hysteresis component in detail.

[0034] Figure 4 It shows Figure 3 The first cover plate in the illustrated embodiment.

[0035] Figure 5 It shows Figure 3 The drive disk in the illustrated embodiment.

[0036] Figure 6 It shows Figure 3 The hysteresis disk in the illustrated embodiment.

[0037] Figure 7 It shows Figure 3 The stop plate in the illustrated embodiment.

[0038] Figure 8 It shows Figure 3 The pressure plate in the illustrated embodiment.

[0039] Figure 9 It shows Figure 3 The variable hysteresis disk in the illustrated embodiment.

[0040] Figure 10A and Figure 10B The enlarged view shows the cooperation between the variable hysteresis disk, the damping spring, and the drive disk, wherein... Figure 10B exist Figure 10A The drive disc is hidden on the basis of the design to better show the cooperation between the variable hysteresis disc and the damping spring.

[0041] Figure 11 It shows Figure 3 The collar in the illustrated embodiment.

[0042] Figure 12 It shows Figure 3 The hysteresis spring in the illustrated embodiment.

[0043] In each figure, identical or similar parts are represented by the same reference numerals. Detailed Implementation

[0044] The accompanying drawings of the embodiments provide a clear and complete description of the technical solutions of the embodiments of this disclosure.

[0045] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The use of terms such as “a,” “an,” or “the” in this patent application specification and claims does not indicate a limitation of quantity, but rather indicates the presence of at least one. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Although expressions such as “first” and “second” are used to describe the various elements of this disclosure, they are only used to distinguish one component from another and are not used to define the order or importance of the respective components. Without departing from the scope of this disclosure, “first element” may be written as “second element,” and similarly, “second element” may be written as “first element.” Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, which may change accordingly when the absolute position of the described object changes. The directions “axial,” “radial,” and “circumferential” are defined relative to the rotation axis X of the torque transmission device. The axial direction is the direction in which the rotation axis X extends, the radial direction is the direction perpendicular to the rotation axis X, and the circumferential direction is the circumferential direction around the rotation axis X.

[0046] Figure 1 This is a schematic diagram of a transmission assembly 1 according to an embodiment of the present disclosure. Figure 2 yes Figure 1 The cross-sectional view of the transmission assembly shown.

[0047] The transmission assembly 1 is used to transmit torque between the vehicle's engine and gearbox. The transmission assembly 1 can be divided into two parts: a torque transmission device 100 and a torque limiter 200. The torque limiter 200 is connected to and driven by the crankshaft of the vehicle's engine to transmit torque about the rotation axis X. The torque transmission device 100 is entirely located inside the torque limiter 200 and outputs the torque transmitted by the torque limiter 200 to the vehicle's gearbox.

[0048] refer to Figure 1 and Figure 2The torque limiter 200 includes an input portion 210 and an output portion 220. The torque transmitted from the input portion 210 to the output portion 220 has a predetermined threshold. When the torque generated by the engine exceeds this predetermined threshold, a relative slippage occurs between the input portion 210 and the output portion 220 in the circumferential direction, preventing the torque transmitted to the output portion 220 from exceeding the predetermined threshold. The torque limiter 200 also includes an inertia ring 230 fixed to the input portion 210. This inertia ring 230 increases the rotational inertia of the input portion 210, acting as a flywheel. Accordingly, instead of a dedicated flywheel between the torque limiter 200 and the crankshaft of the vehicle engine, it is directly fixed to the crankshaft of the vehicle engine via the input portion 210. As will be described in detail below, fasteners can pass through the torque transmission device 100 to secure the input portion 210 to the crankshaft.

[0049] refer to Figure 1 and Figure 2 The torque transmission device 100 has a torque input assembly 110 and a torque output assembly 120 disposed around and movable about the rotation axis X, and a damping spring 130 arranged to be circumferentially compressed between the torque input assembly 110 and the torque output assembly 120. The torque input assembly 110 is fixed to the output portion 220 of the torque limiter 200 to receive torque transmitted from the torque limiter 200. The spring 130 is a helical spring, one end of which is acted by the torque input assembly 110, and the other end acts on the torque output assembly 120 to transmit torque from the torque input assembly 110 to the torque output assembly 120. That is, the torque transmission device 100 can be implemented as a torsional vibration damper.

[0050] The torque input component 110 is rotatable relative to the torque output component 120 between a zero position, a positive segment, and a negative segment, with the positive and negative segments located on opposite sides of the zero position in the circumferential direction. Specifically, when no torque is transmitted between the torque input component 110 and the torque output component 120, the torque input component 110 is at the zero position. When the torque input component 110 drives the torque output component 120, torque is transmitted from the torque input component 110 to the torque output component 120, and the torque input component 110 is located in the positive segment; when the torque input component 110 is dragged by the torque output component 120, torque is transmitted from the torque output component 120 to the torque input component 110, and the torque input component 110 is located in the negative segment.

[0051] When the torque transmitted by the torque transmission device 100 changes, relative rotation occurs between the torque input component 100 and the torque output component 120, causing a change in the angular position of the torque input component 110. Furthermore, when fluctuations occur in the torque generated by the vehicle engine, relative rotation can also occur between the torque input component 110 and the torque output component 120. This relative rotation manifests as the torque input component 110 vibrating back and forth in the circumferential direction at a specific angular position. The spring 130 can absorb and mitigate these torque fluctuations through compression and extension.

[0052] Regarding the relative rotation of the torque input component 110, the torque transmission device 100 further includes a hysteresis component 2, which can attenuate torque fluctuations and adjust the dynamic torque transmission characteristics of the torque transmission device 100. Specifically, the hysteresis component 2 hysteresis the relative rotation between the torque input component 110 and the torque output component 120 through friction. Depending on the different operating conditions of the torque transmission device 100, the hysteresis component 2 can generate different amounts of hysteresis to meet the vehicle's driving requirements. Specifically, the hysteresis component 2 can generate four total hysteresis amounts H1-H4:

[0053] a. When the torque input component 110 is in the positive section and the relative rotation between the torque input component 110 and the torque output component 120 is less than a predetermined threshold, the hysteresis component 2 generates a total hysteresis amount H1.

[0054] b. When the torque input component 110 is in the positive section and the relative rotation between the torque input component 110 and the torque output component 120 is greater than a predetermined threshold, the hysteresis component 2 generates a total hysteresis amount H2.

[0055] c. When the torque input component 110 is in the negative section and the relative rotation between the torque input component 110 and the torque output component 120 is less than a predetermined threshold, the hysteresis component 2 generates a total hysteresis amount H3.

[0056] d. When the torque input component 110 is in the negative segment and the relative rotation between the torque input component 110 and the torque output component 120 is greater than a predetermined threshold, the hysteresis component 2 generates a total hysteresis amount H4.

[0057] Ideally, when the relative rotation between the torque input component 110 and the torque output component 120 is equal to or greater than a predetermined threshold, the total hysteresis of the hysteresis component 2 is relatively large, which can quickly dampen vibration. When the relative rotation between the torque input component 110 and the torque output component 120 is less than the predetermined threshold, the total hysteresis of the hysteresis component 2 is relatively small, which can reduce energy consumption and improve the response speed to torque changes. That is, the total hysteresis of the hysteresis component 2 satisfies the following relationship: H2 > H1 and H4 > H3.

[0058] Furthermore, the torque input component 110 is in the negative range primarily during vehicle start-up and shutdown, resulting in relatively large torque fluctuations from the engine. Conversely, the torque input component 110 is in the positive range primarily during normal vehicle operation, resulting in relatively small torque fluctuations from the engine. Therefore, it is desirable that the total hysteresis of the hysteresis component 2 is relatively large in the negative range to quickly dampen vibrations, while the total hysteresis is relatively small in the positive range to reduce energy consumption and improve the response speed to torque changes. That is, the total hysteresis of the hysteresis component 2 is H3 > H1 and H4 > H2.

[0059] Therefore, the hysteresis component 2 according to this disclosure includes a first hysteresis sub-component 2a and a second hysteresis sub-component 2b. Both the first hysteresis sub-component 2a and the second hysteresis sub-component 2b can generate different hysteresis amounts according to different operating conditions of the torque transmission device 100, thereby meeting the vehicle's driving requirements.

[0060] Specifically, when the relative rotation between the torque input component 110 and the torque output component 120 is less than a predetermined threshold, the first hysteresis sub-component 2a generates a first hysteresis amount h1; when the relative rotation between the torque input component 110 and the torque output component 120 is equal to or greater than the predetermined threshold, the first hysteresis sub-component 2a generates the first hysteresis amount h1 and the second hysteresis amount h2; when the torque input component 110 is in the positive segment, the second hysteresis sub-component 2b generates a third hysteresis amount h3; and when the torque input component 110 is in the negative segment, the second hysteresis sub-component 2b generates a fourth hysteresis amount h4, the fourth hysteresis amount h4 being greater than the third hysteresis amount h3.

[0061] Therefore, the four total hysteresis quantities H1-H4 generated by the hysteresis component 2 under different operating conditions are as follows: H1 = h1 + h3; H2 = h1 + h2 + h3; H3 = h1 + h4; H4 = h1 + h2 + h4. It can be seen that the magnitudes of these four total hysteresis quantities H1-H4 satisfy the following relationship: H4 > H2 > H1, and H4 > H3 > H1, which meets the hysteresis quantity requirements of the torque transmission device 100 under different operating conditions (and corresponding vehicle driving states).

[0062] The structure of the torque transmission device 100 will be described in detail below with reference to the accompanying drawings.

[0063] Further reference Figure 3 The torque input assembly 110 of the torque transmission device 100 includes a first cover plate 10a and a second cover plate 10b. The second cover plate 10b is fastened to the first cover plate 10a, thereby rotating together with the first cover plate 10a. Either the first cover plate 10a or the second cover plate 10b ( Figure 3In the illustrated embodiment, the second cover plate 10b) is fixed to the output portion 220 of the torque limiter 200 and is thus driven by the torque limiter 200. The torque output assembly 120 includes a drive disc 20 and an output hub 80. The drive disc 20 is axially arranged between the first cover plate 10a and the second cover plate 10b, and the output hub 80 is circumferentially fastened to the drive disc 20 and can be coupled to a downstream component, such as a gearbox input shaft, to output torque.

[0064] Specifically, the innermost radial edge of the hysteresis component 2 is separated from the outermost radial edge of the output hub 80 by a certain radial distance. (Reference) Figure 2 , Figure 3 and Figure 5 The drive disc 20 has one or more through holes 23 between the innermost radial edge of the hysteresis assembly 2 and the outermost radial edge of the output hub 80. Fasteners such as screws can pass through the through holes 23 to secure the input portion 210 of the torque limiter 200 to the crankshaft of the engine.

[0065] like Figure 3 As shown, the hysteresis assembly 2 includes a first hysteresis sub-assembly 2a, a second hysteresis sub-assembly 2b, and a hysteresis spring 3. The first hysteresis sub-assembly 2a includes a hysteresis disc 30, a stop disc 40, and a pressure disc 50. The second hysteresis sub-assembly 2b includes a variable hysteresis disc 60 and a collar 70. The first hysteresis sub-assembly 2a and the second hysteresis sub-assembly 2b are respectively arranged on both axial sides of the drive disc 20.

[0066] The pressure plate 50, stop plate 40, and hysteresis plate 30 of the first hysteresis sub-assembly 2a are axially arranged sequentially between the first cover plate 10a and the drive plate 20. The hysteresis plate 30 and the pressure plate 50 are circumferentially locked relative to the first cover plate 10a, thereby rotating together with the first cover plate 10a, while the stop plate 40 is circumferentially connected to the drive plate 20 with a certain free travel. As described above, the hysteresis generated by the first hysteresis sub-assembly 2a varies depending on the magnitude of the relative rotation between the torque input assembly 110 and the torque output assembly 120, but does not change regardless of whether the torque input assembly 110 is in the positive or negative segment.

[0067] refer to Figure 4 and Figure 8The first cover plate 10a is provided with a first locking hole 11, and the pressure plate 50 includes a first locking pin 51 extending axially toward the first cover plate 10a and inserted into the first locking hole 11. The circumferential dimensions of the first locking pin 51 and the first locking hole 11 are approximately equal, so that the pressure plate 50 is circumferentially locked to the first cover plate 10a. The pressure plate 50 is also provided with a first locking groove 52, and the hysteresis plate 30 includes a second locking pin 31 extending axially and inserted into the first locking groove 52. The circumferential dimensions of the second locking pin 31 and the first locking groove 52 are approximately equal, so that the hysteresis plate 30 is circumferentially locked to the pressure plate 50, and indirectly circumferentially locked to the first cover plate 10a. The first locking hole 11 does not impede the axial movement of the first locking pin 51, and the first locking groove 52 does not impede the axial movement of the second locking pin 31, so that the hysteresis plate 30, the pressure plate 50, and the first cover plate 10a can move relative to each other in the axial direction.

[0068] The hysteresis spring 3 is axially arranged between the pressure plate 50 and the first cover plate 10a, and the stop plate 40 is axially arranged between the hysteresis plate 30 and the pressure plate 50. (Reference) Figure 3 and combined Figure 12 The hysteresis spring 3 is in the form of a disc spring, which axially biases the pressure plate 50 toward the stop plate 40, axially biases the stop plate 40 toward the hysteresis plate 30, and further axially biases the hysteresis plate 30 onto the drive plate 20. The hysteresis plate 30 is in direct contact with the drive plate 20, and the stop plate 40 is in contact with the pressure plate 50 and the hysteresis plate 30 from above and below, respectively. Preferably, the hysteresis spring 3 is substantially circumferentially locked to the pressure plate 50 (e.g., through the engagement between the radially inwardly extending support leg and the first locking pin 51 of the pressure plate 50), and further circumferentially locked to the first cover plate 10a.

[0069] As described above, the hysteresis disk 30 and pressure disk 50 of the first hysteresis sub-assembly 2a are circumferentially locked to the first cover disk 10a, thereby rotating together with the torque input assembly 110. When the torque input assembly 110 rotates relative to the torque output assembly 120, the hysteresis disk 30 rotates relative to the drive disk 20, and the friction between them 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 stop disk 40 has a free travel relative to the drive disk 20 in the circumferential direction, and can thus be driven by the hysteresis disk 30 and pressure disk 50 to rotate together with the torque input assembly 110. 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 stop disk 40 is stopped by the drive disk 20, and is thus driven by the drive disk 20 to rotate together with the torque output assembly 120.

[0070] Therefore, a first stop portion is provided on the stop disc 40, and a second stop portion is provided on the drive disc 20. When the stop disc 40 rotates relative to the drive disc 20 to the end of its free travel, the first stop portion abuts against the second stop portion, so that the stop disc 40 is stopped by the drive disc 20. (Reference) Figure 5 and Figure 7 The stop plate 40 includes a first stop tooth 41 extending axially toward the drive plate 20, and the drive plate 20 has a first stop hole 22. The first stop tooth 41 is inserted into the first stop hole 22, and the circumferential dimension of the first stop hole 22 is larger than the circumferential dimension of the first stop tooth 41. Therefore, the stop plate 40 and the drive plate 20 are not completely locked in the circumferential direction, but can rotate relative to each other within a certain angular range (e.g., about 3°). Thus, the first stop tooth 41 forms a first stop portion of the stop plate 40, and the first stop hole 22 forms a second stop portion of the drive plate 20. It is understood that the first stop portion and the second stop portion can also be formed in other suitable ways. For example, the stop plate 40 and the drive plate 20 may each have stop teeth suitable for insertion into each other at intervals, and the circumferential dimension of the interval is larger than the circumferential dimension of the stop teeth.

[0071] When the relative rotation between the torque input component 110 and the torque output component 120 is equal to or greater than a predetermined threshold, the first stop tooth 41 (or other form of first stop part) rotates to abut the end of the first stop hole 22 (or abuts against other form of second stop part), causing the stop plate 40 to be stopped by the drive plate 20 and to rotate relative to the hysteresis plate 30 and the pressure plate 50. The friction between the stop plate 40 and the hysteresis plate 30 generates a first sub-hysteresis h2a, and the friction between the stop plate 40 and the pressure plate 50 generates a second sub-hysteresis h2b. The second hysteresis h2 generated by the first hysteresis sub-component 2a is composed of the first sub-hysteresis h2a and the second sub-hysteresis h2b, i.e., h2 = h2a + h2b.

[0072] When the relative rotation between the torque input component 110 and the torque output component 120 is less than a predetermined threshold, the first stop tooth 41 (or other form of first stop portion) can rotate within the first stop hole 22 (or rotate relative to other forms of second stop portions). The stop plate 40 is then within its free travel relative to the drive plate 20 and is held by the hysteresis plate 30 and the pressure plate 50, rotating along with them. There is no longer any hysteresis between the stop plate 40 and the hysteresis plate 30 and the pressure plate 50 due to friction, and the first hysteresis sub-component 2a no longer generates a second hysteresis amount h2.

[0073] The magnitude of the hysteresis can also be adjusted by changing the coefficient of friction between the relevant components. The coefficient of friction between metals is relatively large, while the coefficients of friction between plastics and between metals are relatively small. The stop plate 40 is usually made of metal, for example, by stamping. When a larger hysteresis is required, the hysteresis plate 30 and / or pressure plate 50 can be made of metal, while when a smaller hysteresis is required, the hysteresis plate 30 and / or pressure plate 50 can be made of plastic.

[0074] exist Figure 3 In the illustrated embodiment, the second hysteresis sub-component 2b of the hysteresis component 2 includes a variable hysteresis disk 60 and a collar 70. The amount of hysteresis generated by the second hysteresis sub-component 2b varies depending on whether the torque input component 110 is in the positive or negative segment, but does not change due to the magnitude of the relative rotation between the torque input component 110 and the torque output component 120.

[0075] refer to Figure 3 and combined Figure 5 and Figures 9-11 The variable hysteresis disk 60 and the collar 70 are axially clamped between the drive disk 20 and the second cover disk 10b. Specifically, the drive disk 20, the collar 70, the variable hysteresis disk 60, and the second cover disk 10b are arranged axially in sequence. The axial biasing force of the hysteresis spring 3 is transmitted through the drive disk 20 and the collar 70, ultimately pressing the variable hysteresis disk 60 against the second cover disk 10b.

[0076] The variable hysteresis disk 60 includes a first drive tooth 61 that is inserted into a spring slot 21 on the drive disk 20 for receiving a damping spring 130. Specifically, the first drive tooth 61 is arranged at one and only one circumferential end of the spring slot 21. In the non-limiting embodiment shown in the figures, the torque transmission device 100 includes four springs 130, the drive disk 20 is provided with four spring slots 21, and the variable hysteresis disk 60 includes four first drive teeth 61. These four first drive teeth 61 are respectively arranged in the same circumferential direction (without loss of generality, this same circumferential direction is referred to below as the first circumferential direction, i.e., in the...) of the corresponding spring slots 21. Figure 10A and Figure 10B At the end (clockwise direction in the example shown).

[0077] The collar 70 has a radial extension 71 and an axial extension 72. It is understood that the radial extension 71 of the collar 70 is located radially inside the first drive tooth 61 of the variable hysteresis disk 60, thereby enabling it to be axially clamped between the variable hysteresis disk 60 and the drive disk 20. The axial extension 72 of the collar 70 is inserted radially inside the variable hysteresis disk 60 and the second cover disk 10b, and the outer diameter of the axial extension 72 is approximately equal to the diameter of the central hole of the variable hysteresis disk 60 and the second cover disk 10b, thereby limiting the radial displacement of the collar 70. The collar 70 has no circumferential connection with any other components of the torque transmission device 100, but is axially limited only by the radial extension 71 and radially limited by the axial extension 72.

[0078] refer to Figure 3 and Figure 4 The first cover plate 10a and the second cover plate 10b of the torque input assembly 110 are also provided with corresponding spring grooves 12. When the torque input assembly 110 is in the negative section, the damping spring 130 will be compressed in the first circumferential direction by the spring groove 12, and the first drive tooth 61 of the variable hysteresis disk 60 will be pressed circumferentially against the end of the spring groove 21 of the drive disk 20 in the first circumferential direction, so that the variable hysteresis disk 60 rotates with the drive disk 20. When the torque input assembly 110 is in the positive section, the damping spring 130 will be compressed in the second circumferential direction (i.e., in the opposite direction to the first circumferential direction) by the spring groove 12. Figure 10A and Figure 10B The compression (counterclockwise in the example shown) causes the damping spring 130 to separate from the end of the spring groove 21 in the first circumferential direction, and it no longer biases the first drive tooth 61. At this time, the variable hysteresis disk 60 can rotate relative to the drive disk 20, but no longer rotates with it. That is to say, the variable hysteresis disk 60 can rotate freely relative to the torque output component 120.

[0079] When the torque input component 110 is in the positive direction, the variable hysteresis disk 60 can rotate freely relative to the drive disk 20. It will be driven by the frictional force of the second cover disk 10b and rotate along with it, that is, along with the torque input component 110. Therefore, the drive disk 20 and the variable hysteresis disk 60 on the upper and lower sides of the collar 70 rotate with the torque output component 120 and the torque input component 110, respectively. The rotational speed of the collar 70 is between that of the drive disk 20 and the variable hysteresis disk 60. When relative rotation occurs between the torque input component 110 and the torque output component 120, the collar 70 can rub against the drive disk 20 and / or the variable hysteresis disk 60, generating a third hysteresis amount h3.

[0080] When the torque input component 110 is in the negative section, the variable hysteresis disk 60 rotates along with the drive disk 20, that is, it rotates along with the torque output component 120. The drive disk 20 and the variable hysteresis disk 60 on the upper and lower sides of the collar 70 have the same rotational speed. Therefore, the collar 70 will also be driven by the drive disk 20 and the variable hysteresis disk 60 to rotate along with the torque output component 120. When relative rotation occurs between the torque input component 110 and the torque output component 120, the variable hysteresis disk 60 will rub against the second cover disk 10b, generating a fourth hysteresis amount h4. The fourth hysteresis amount h4 is not equal to the third hysteresis amount h3. Preferably, the fourth hysteresis amount h4 is greater than the third hysteresis amount h3. In particular, the collar 70 is made of plastic, while the second cover disk 10b and the variable hysteresis disk 60 are made of metal. Therefore, the fourth hysteresis amount h4 generated by friction between metal materials is greater than the third hysteresis amount h3 generated by friction between metal materials and plastic materials.

[0081] According to another aspect of this disclosure, a vehicle is proposed that includes the transmission assembly 1 as described above. The vehicle is, in particular, a hybrid vehicle.

[0082] Certain features, structures, or characteristics in one or more embodiments of this disclosure may be appropriately combined.

[0083] The foregoing description is illustrative of the present disclosure and should not be construed as limiting it. While several exemplary embodiments of the present disclosure have been described, those skilled in the art will readily understand that many modifications may be made to the exemplary embodiments without departing from the novel teachings and advantages of the present disclosure. Therefore, all such modifications are intended to be included within the scope of the present disclosure as defined in the claims. It should be understood that the foregoing description is illustrative of the present disclosure and should not be construed as limiting it to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of this disclosure.

Claims

1. A torque transmission device (100), characterized in that, The torque transmission device (100) includes: A torque input assembly (110) arranged about a rotation axis (X) includes a first cover plate (10a); A torque output assembly (120) arranged about a rotation axis (X) includes a drive disk (20) and an output hub (80) fastened to the drive disk (20); Hysteresis component (2) is configured to hysteresis the relative rotation between the torque input component (110) and the torque output component (120) through friction. The innermost radial edge of the hysteresis component (2) is separated from the outermost radial edge of the output hub (80) by a certain radial distance, and The drive disk (20) has one or more through holes (23) between the innermost radial edge of the hysteresis component (2) and the outermost radial edge of the output hub (80).

2. The torque transmission device (100) according to claim 1, characterized in that, The torque input component (110) is rotatable relative to the torque output component (120) between a zero position, a positive segment, and a negative segment. The positive segment and the negative segment are located on either side of the zero position in the circumferential direction. When the torque input component (110) is at the zero position, no torque is transmitted between the torque input component (110) and the torque output component (120). When the torque input component (110) is in the positive segment, it transmits torque to the torque output component (120). When the torque input component (110) is in the negative segment, the torque output component (120) transmits torque to the torque input component (110). The hysteresis component (2) includes a first hysteresis sub-component (2a) and a second hysteresis sub-component (2b). Specifically, when the relative rotation between the torque input component (110) and the torque output component (120) is less than a predetermined threshold, the first hysteresis sub-component (2a) generates a first hysteresis amount h1; when the relative rotation between the torque input component (110) and the torque output component (120) is equal to or greater than the predetermined threshold, the first hysteresis sub-component (2a) generates the first hysteresis amount h1 and a second hysteresis amount h2. When the torque input component (110) is in the positive section, the second hysteresis sub-component (2b) generates a third hysteresis amount h3, and when the torque input component (110) is in the negative section, the second hysteresis sub-component (2b) generates a fourth hysteresis amount h4, wherein the third hysteresis amount h3 and the fourth hysteresis amount h4 are not equal. The total hysteresis generated by the hysteresis component (2) is: a. When the torque input component (110) is in the positive section and the relative rotation between the torque input component (110) and the torque output component (120) is less than a predetermined threshold, the total hysteresis amount H1 generated by the hysteresis component (2) is h1 + h3; b. When the torque input component (110) is in the positive section and the relative rotation between the torque input component (110) and the torque output component (120) is greater than a predetermined threshold, the total hysteresis H2 generated by the hysteresis component (2) is h1 + h2 + h3; c. When the torque input component (110) is in the negative section and the relative rotation between the torque input component (110) and the torque output component (120) is less than a predetermined threshold, the total hysteresis H3 generated by the hysteresis component (2) is h1 + h4; d. When the torque input component (110) is in the negative segment and the relative rotation between the torque input component (110) and the torque output component (120) is greater than a predetermined threshold, the total hysteresis H4 generated by the hysteresis component (2) is h1 + h2 + h4.

3. The torque transmission device (100) according to claim 2, characterized in that, The hysteresis assembly (2) further includes a hysteresis spring (3) axially arranged between the first cover plate (10a) and the drive plate (20), and The first hysteresis sub-component (2a) includes: A hysteresis disk (30) is circumferentially locked relative to the first cover plate (10a) and axially arranged between the hysteresis spring (3) and the drive disk (20). The hysteresis spring (3) axially biases the hysteresis disk (30) onto the drive disk (20). When relative rotation occurs between the torque input component (110) and the torque output component (120), the friction between the hysteresis disk (30) and the drive disk (20) generates the first hysteresis amount h1.

4. The torque transmission device (100) according to claim 3, characterized in that, The first hysteresis sub-component (2a) further includes: A stop plate (40) is axially arranged between the hysteresis spring (3) and the hysteresis disk (30) and is rotatable relative to the hysteresis disk (30). The stop plate (40) has a free travel in the circumferential direction relative to the drive disk (20). At the end of this free travel, the stop plate (40) is stopped by the drive disk (20). Specifically, when the relative rotation between the torque input component (110) and the torque output component (120) is less than the predetermined threshold, the stop plate (40) rotates together with the hysteresis plate (30). When the relative rotation between the torque input component (110) and the torque output component (120) is equal to or greater than the predetermined threshold, the stop plate (40) is stopped by the drive plate (20), thereby rotating relative to the hysteresis plate (30). The friction between the stop plate (40) and the hysteresis plate (30) generates a first sub-hysteresis h2a that constitutes at least a part of the second hysteresis h2.

5. The torque transmission device (100) according to claim 4, characterized in that, The first hysteresis sub-assembly (2a) further includes a pressure plate (50) configured to be circumferentially locked relative to the first cover plate (10a), the pressure plate (50) being axially arranged between the hysteresis spring (3) and the stop plate (40), such that the hysteresis spring (3) axially biases the pressure plate (50) onto the stop plate (40). When the relative rotation between the torque input component (110) and the torque output component (120) is equal to or greater than the predetermined threshold, the stop plate (40) rotates relative to the pressure plate (50), and the friction between the stop plate (40) and the pressure plate (50) generates a second sub-hysteresis h2b that constitutes at least a part of the second hysteresis h2.

6. The torque transmission device (100) according to claim 4 or 5, characterized in that, The stop plate (40) is provided with a first stop part, and the drive plate (20) is provided with a second stop part. When the stop plate (40) rotates relative to the drive plate (20) to the end of the free stroke, the first stop part abuts against the second stop part.

7. The torque transmission device (100) according to claim 6, characterized in that, The stop plate (40) includes a first stop tooth (41) extending axially toward the drive plate (20), the first stop tooth (41) forming the first stop portion. The drive disk (20) is provided with a first stop hole (22), which forms the second stop portion. The first stop tooth (41) is inserted into the first stop hole (22), and the circumferential dimension of the first stop hole (22) is greater than the circumferential dimension of the first stop tooth (41).

8. The torque transmission device (100) according to claim 5, characterized in that, The first cover plate (10a) is provided with a first locking hole (11), and the pressure plate (50) includes a first locking post (51) extending axially toward the first cover plate (10a) and inserted into the first locking hole (11). The circumferential dimensions of the first locking post (51) and the first locking hole (11) are approximately equal.

9. The torque transmission device (100) according to claim 8, characterized in that, The pressure plate (50) is also provided with a first locking groove (52), and the hysteresis plate (30) includes a second locking post (31) that extends axially and is inserted into the first locking groove (52). The circumferential dimensions of the second locking post (31) and the first locking groove (52) are approximately equal.

10. The torque transmission device (100) according to claim 5, characterized in that, The hysteresis disk (30) and / or the pressure disk (50) are made of plastic or metal, and, The stop plate (40) is made of metal.

11. The torque transmission device (100) according to any one of claims 3 to 10, characterized in that, The torque input assembly (110) further includes a second cover plate (10b) fastened to the first cover plate (10a), the second cover plate (10b) and the first cover plate (10a) being located on opposite axial sides of the drive disc (20), and The second hysteresis sub-component (2b) includes A variable hysteresis disk (60) is axially arranged between the second cover disk (10b) and the drive disk (20); and A collar (70) is axially clamped between the variable hysteresis disk (60) and the drive disk (20). The hysteresis spring (3) axially biases the variable hysteresis disk (60) onto the second cover disk (10b) via the drive disk (20) and the collar (70). When the torque input component (110) is in the positive section, the variable hysteresis disk (60) can rotate freely relative to the drive disk (20), and the friction between the collar (70) and the drive disk (20) and / or the variable hysteresis disk (60) generates a third hysteresis amount h3, and When the torque input component (110) is in the negative section, the variable hysteresis disk (60) rotates together with the drive disk (20), and the friction between the variable hysteresis disk (60) and the second cover disk (10b) generates a fourth hysteresis amount h4.

12. The torque transmission device (100) according to claim 11, characterized in that, The torque transmission device (100) further includes a damping spring (130) configured to compress circumferentially between the torque input assembly (110) and the torque output assembly (120). The drive disk (20) is provided with a spring groove (21) configured to accommodate the damping spring (130), and the variable hysteresis disk (60) includes a first drive tooth (61) extending into the spring groove (21) at one circumferential end of the spring groove (21). When the torque input component (110) is in the negative section, the damping spring (130) presses the first drive tooth (61) circumferentially against the circumferential end of the spring groove (21), and When the torque input component (110) is in the positive section, the damping spring (130) no longer biases the first drive tooth (61).

13. The torque transmission device (100) according to claim 11, characterized in that, The collar (70) has a radial extension (71) and an axial extension (72), the collar (70) being axially clamped between the variable hysteresis disk (60) and the drive disk (20) by the radial extension (71), and the axial extension (72) being inserted into the radial interior of the variable hysteresis disk (60) and / or the second cover disk (10b).

14. The torque transmission device (100) according to claim 11, characterized in that, The collar (70) is made of plastic, and the second cover plate (10b) and the variable hysteresis plate (60) are made of metal.

15. A transmission assembly (1), characterized in that, The transmission assembly (1) includes: The torque transmission device (100) according to any one of claims 1 to 14, and A torque limiter (200) includes an input section (210) and an output section (220), the torque limiter (200) being configured to transmit a torque less than a predetermined threshold from the input section (210) to the output section (220). The output portion (220) of the torque limiter (200) is circumferentially locked to the torque input component (110) of the torque transmission device (100).

16. The transmission assembly (1) according to claim 15, characterized in that, The input portion (210) of the torque limiter (200) is fastened to the upstream component of the transmission assembly (1) by fasteners passing through the through hole (23).

17. The transmission assembly (1) according to claim 15 or 16, characterized in that, The torque limiter (200) also includes an inertia loop (230) fixed to the input portion (210).

18. A vehicle, characterized in that, The vehicle includes a transmission assembly (1) according to any one of claims 15 to 17.

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