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; a torque output assembly disposed about the axis of rotation; the first hysteresis component has a first hysteresis amount H1; and a second hysteresis component having a second hysteresis amount H2. When the relative rotation between the torque input assembly and the torque output assembly is smaller than a preset threshold value, the total hysteresis H borne by the relative rotation between the torque input assembly and the torque output assembly is equal to H2. When the relative rotation between the torque input assembly and the torque output assembly is equal to or larger than a preset threshold value, the total hysteresis amount H borne by the relative rotation between the torque input assembly and the torque output assembly is equal to H1 + H2. 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] The present disclosure relates to a torque transmission device, a transmission assembly including the same, and a vehicle. Specifically, the torque transmission device generates a greater hysteresis in torque transmission when torque fluctuations are large, while generating a smaller hysteresis in torque transmission when torque fluctuations are small, thereby meeting the vehicle's driving requirements under different operating conditions. Background Art

[0002] The torque generated by a vehicle engine is usually not constant and often fluctuates. This inconsistent torque can be transmitted to the gearbox, causing vibrations in the gearbox and thus generating particularly undesirable noise or impacts, etc. In order to reduce the adverse effects of vibrations and improve the driving comfort of the vehicle, it is known to equip the vehicle transmission system with a torque fluctuation absorbing mechanism. The torque fluctuation absorbing mechanism can allow the fluctuations in the torque generated by the vehicle engine to be limited and absorbed. It is known that the torque fluctuation absorbing mechanism can include a torsional vibration damper and a torque limiter. The torsional vibration damper usually absorbs and reduces fluctuations in torque through a spring structure, while the torque limiter can limit torque fluctuations that exceed the maximum torque that the torsional vibration damper can allow.

[0003] A torsional vibration damper typically consists of a torque input portion, a torque output portion, and a spring arranged in circumferential compression between the two. The torque input and output portions are capable of rotating relative to each other, and the spring absorbs and mitigates torque fluctuations through compression and expansion. A hysteresis component may also be included in the torsional vibration damper to reduce torque fluctuations by introducing frictional hysteresis in torque transmission between the torque input and output portions.

[0004] Vehicles experience a variety of operating conditions during use, each with different requirements for the hysteresis of the torsional vibration damper. For example, when the vehicle is starting or shutting down, the engine generates large torque fluctuations, requiring a large hysteresis in the torsional vibration damper to dampen these fluctuations. However, during normal driving, the engine generates relatively small torque fluctuations, requiring a small hysteresis in the torsional vibration damper to reduce energy consumption during torque transmission and improve the vehicle's dynamic response sensitivity.

[0005] Therefore, there is an urgent need for a torque transmission device that has different hysteresis amounts according to the fluctuation of the torque to be transmitted to meet the needs of different vehicle working conditions. Utility Model Content

[0006] Therefore, the present disclosure aims to solve the above-mentioned problems, and its purpose is to provide a torque transmission device having different hysteresis amounts according to the fluctuation of the torque to be transmitted to meet the driving requirements of the vehicle.

[0007] The aforementioned object is achieved by a torque transmission device according to one embodiment of the present disclosure, comprising: a torque input assembly disposed about a rotation axis and including a first cover plate; a torque output assembly disposed about the rotation axis and including a drive plate, the torque output assembly being rotatable relative to the torque input assembly; a first hysteresis assembly configured to delay relative rotation between the torque input assembly and the torque output assembly through friction, the first hysteresis assembly having a first hysteresis H1; and a second hysteresis assembly configured to delay relative rotation between the torque input assembly and the torque output assembly through friction, the second hysteresis assembly having a second hysteresis H2. When the relative rotation between the torque input assembly and the torque output assembly is less than a predetermined threshold, only the second hysteresis assembly performs a hysteresis function, such that the total hysteresis H of the relative rotation between the torque input assembly and the torque output assembly is equal to or greater than the predetermined threshold. When the relative rotation between the torque input assembly and the torque output assembly is equal to or greater than the predetermined threshold, both the first and second hysteresis assemblies perform a hysteresis function, such that the total hysteresis H of the relative rotation between the torque input assembly and the torque output assembly is equal to or greater than the predetermined threshold.

[0008] One objective of the present disclosure is to provide a torque transmission device having different hysteresis amounts depending on fluctuations in the torque being transmitted. The torque transmission device according to the present disclosure includes a first hysteresis component and a second hysteresis component, wherein whether the first hysteresis component can provide hysteresis can be adjusted based on the relative rotation between the torque input component and the torque output component.

[0009] For example, when a vehicle is starting or shutting down, engine torque fluctuations are significant, and the relative rotation between the torque input assembly and the torque output assembly may exceed a predetermined threshold. Both the first and second hysteresis assemblies act as hysteresis components, generating a large total hysteresis, thereby rapidly attenuating vibrations. During normal vehicle operation, engine torque fluctuations are relatively small, and the torque input assembly rotates back and forth relative to the torque output assembly within a small angular range, keeping the relative rotation between the two below the predetermined threshold. In this case, only the second hysteresis component acts as hysteresis, resulting in a low total hysteresis. This reduces energy consumption in the torque transmission device, improves the torque transmission device's response to torque changes, and thereby enhances the vehicle's dynamic response sensitivity.

[0010] The torque transmitting device according to the present disclosure may also have one or more of the following features, alone or in combination.

[0011] According to one embodiment of the present disclosure, the first hysteresis assembly includes: a retaining disk fastened to the first cover disk, wherein the first cover disk and the retaining disk are axially located on the same side of the driving disk; a hysteresis disk axially disposed between the first cover disk and the retaining disk and rotatable relative to the retaining disk, the hysteresis disk having a free travel relative to the driving disk in a circumferential direction, and being stopped by the driving disk at the end of the free travel; and a first hysteresis spring axially disposed between the first cover disk and the hysteresis disk and axially biasing the hysteresis disk against the retaining disk. When the relative rotation between the torque input assembly and the torque output assembly is less than a predetermined threshold, the hysteresis disk rotates along with the retaining disk, wherein when the relative rotation between the torque input assembly and the torque output assembly is equal to or greater than the predetermined threshold, the hysteresis disk is stopped by the driving disk, thereby rotating relative to the retaining disk, and friction between the hysteresis disk and the retaining disk generates a first sub-hysteresis h1 that constitutes at least a portion of the first hysteresis H1.

[0012] According to the above features, the first hysteresis assembly generates the first sub-hysteresis h1 only when the relative rotation between the torque input assembly and the torque output assembly is greater than or equal to the predetermined threshold. Increasing the friction between the hysteresis plate and the retaining plate can increase the first hysteresis H1, thereby enhancing the torque transmission device's ability to dampen and attenuate large torque fluctuations. For example, by increasing the spring constant of the first hysteresis spring, the biasing force exerted by the hysteresis plate on the retaining plate is increased, thereby increasing the friction between the two. Furthermore, the retaining plate is secured to the first cover plate, thereby absorbing the biasing force of the hysteresis plate. In other words, the retaining plate does not transmit this biasing force by further biasing another component. The effect of increasing the biasing force of the hysteresis plate on the retaining plate is confined to the first hysteresis assembly and is not transmitted to, for example, the second hysteresis assembly. Consequently, this configuration allows the first hysteresis H1 of the first hysteresis assembly to be increased while maintaining a smaller second hysteresis H2 of the second hysteresis assembly, better meeting the hysteresis requirements of different vehicle operating conditions.

[0013] According to one embodiment of the present disclosure, the torque output assembly further includes an output hub fastened to the drive disc, and the second hysteresis assembly includes: a first bushing configured to be sleeved on the output hub and circumferentially locked relative to the first cover disc; a second hysteresis spring, the second hysteresis spring being axially arranged between the first cover disc and the first bushing, and axially biasing the first bushing against the output hub and / or the drive disc, and when the torque input assembly rotates relative to the torque output assembly, the first bushing rotates relative to the output hub and / or the drive disc, and the friction between the first bushing and the output hub and / or the drive disc generates a third sub-hysteresis amount h3 that constitutes a part of the second hysteresis amount H2.

[0014] According to one embodiment of the present disclosure, the first hysteresis assembly further includes a pressure plate configured to be circumferentially locked relative to the first cover plate. The pressure plate is axially disposed between the first hysteresis spring and the hysteresis plate, such that the first hysteresis spring axially biases the pressure plate against the hysteresis plate. When relative rotation between the torque input assembly and the torque output assembly is equal to or greater than a predetermined threshold, the hysteresis plate rotates relative to the pressure plate, and friction between the hysteresis plate and the pressure plate generates a second sub-hysteresis amount h2 that constitutes at least a portion of the first hysteresis amount H1.

[0015] According to one embodiment of the present disclosure, the second hysteresis assembly further comprises a second bushing configured to be mounted on the output hub and circumferentially locked relative to the first cover plate. The second bushing is axially biased against the output hub and / or the drive plate by the action of the second hysteresis spring, with the second bushing and the first bushing being located on opposite axial sides of the drive plate. When the torque input assembly rotates relative to the torque output assembly, the second bushing rotates relative to the output hub and / or the drive plate, and friction between the second bushing and the output hub and / or the drive plate generates a fourth sub-hysteresis h4 that constitutes a portion of the second hysteresis H2.

[0016] According to one embodiment of the present disclosure, the first hysteresis assembly further includes a first stop portion rotationally locked with the hysteresis disk and a second stop portion rotationally locked with the drive disk. When the hysteresis disk rotates relative to the drive disk to the end of the free travel, the first stop portion abuts against the second stop portion. In other words, the hysteresis disk is stopped by the drive disk by the first stop portion abutting against the second stop portion.

[0017] According to one embodiment of the present disclosure, the first hysteresis assembly further includes a stop plate, the stop plate including a first stop tooth extending axially toward the hysteresis plate, the hysteresis plate including a radially extending second stop tooth, the second stop tooth being inserted into a circumferential gap between two adjacent first stop teeth.

[0018] According to one embodiment of the present disclosure, a first locking hole is provided on the driving disk, and the stop disk includes a first locking tooth extending axially toward the driving disk and inserted into the first locking hole. The circumferential dimensions of the first locking tooth and the first locking hole are approximately equal, so that the stop disk is circumferentially locked to the driving disk. The circumferential spacing between the first stop teeth of the stop disk is greater than the circumferential dimension of the second stop teeth of the hysteresis disk. The second stop teeth form the first stop portion, and the first stop teeth form the second stop portion. Due to the circumferential spacing between the first stop teeth and the size setting of the second stop teeth, the second stop teeth can freely rotate by a certain angle within the circumferential spacing, thereby forming a free travel of the hysteresis disk relative to the driving disk.

[0019] According to one embodiment of the present disclosure, the circumferential spacing between the first stop teeth of the stop plate is substantially equal to the circumferential size of the second stop teeth of the hysteresis plate, so that the stop plate and the hysteresis plate are circumferentially locked, and a first locking hole is provided on the driving plate, and the stop plate includes a first locking tooth extending axially toward the driving plate and inserted into the first locking hole, the circumferential size of the first locking hole is larger than the circumferential size of the first locking tooth, the first locking tooth forms the first stop portion, and the first locking hole forms the second stop portion. Due to the size setting of the first locking tooth and the first locking hole, the first locking tooth can freely rotate a certain angle in the first locking hole, forming a free travel of the hysteresis plate relative to the driving plate.

[0020] According to one embodiment of the present disclosure, the drive disk is provided with a stop hole, which forms the second stop portion. The hysteresis disk includes a third stop tooth extending axially toward the drive disk, which forms the first stop portion. The third stop tooth is inserted into the stop hole, and the circumferential dimension of the stop hole is larger than the circumferential dimension of the third stop tooth. In this embodiment, the first stop portion is directly provided on the hysteresis disk, eliminating the need for a separate stop disk. Due to the dimensions of the third stop tooth and the stop hole, the third stop tooth can freely rotate within the stop hole within a certain angle, forming a free travel of the hysteresis disk relative to the drive disk.

[0021] According to one embodiment of the present disclosure, the torque input assembly further includes a second cover plate fastened to the first cover plate, and the second cover plate and the first cover plate are respectively located on two axial sides of the driving plate.

[0022] According to one embodiment of the present disclosure, the retaining disk includes a first radial extension, a second radial extension located radially outward of the first radial extension and axially spaced apart from the first radial extension, and an axial extension connecting the first radial extension and the second radial extension, wherein the retaining disk is riveted to the first cover disk at the first radial extension, and the hysteresis disk is arranged between the first cover disk and the second radial extension.

[0023] According to one embodiment of the present disclosure, a second locking hole is provided on the first cover plate, and the pressure plate includes a second locking tooth extending axially toward the first cover plate and inserted into the second locking hole, and the circumferential dimensions of the second locking tooth and the second locking hole are substantially equal.

[0024] According to one embodiment of the present disclosure, the spring constant of the first hysteresis spring is greater than the spring constant of the second hysteresis spring. This configuration can make the friction between the hysteresis plate and the retaining plate and pressure plate greater than the friction between the first and second bushings and the output hub and / or drive plate, thereby achieving a larger first hysteresis H1 and a smaller second hysteresis H2.

[0025] According to one embodiment of the present disclosure, the first hysteresis spring is made of metal, and / or the second hysteresis spring is made of plastic.

[0026] According to one embodiment of the present disclosure, the hysteresis plate, the pressure plate, and / or the retaining plate are made of metal. Therefore, the friction between the hysteresis plate and the pressure plate and / or the retaining plate is metal-to-metal friction, resulting in a large friction coefficient, thereby achieving a large first hysteresis amount H1.

[0027] According to one embodiment of the present disclosure, the first bushing and / or the second bushing are made of plastic. Therefore, the friction between the first bushing and the second bushing and the output hub and / or the drive plate is the friction between metal and plastic, resulting in a smaller friction coefficient and a smaller second hysteresis H2.

[0028] According to one embodiment of the present disclosure, the torque transmitting device further includes a damping spring configured to be compressed in a circumferential direction between the torque input assembly and the torque output assembly.

[0029] The present disclosure also relates to a transmission assembly comprising the torque transmission device described above and a torque limiter. The torque limiter comprises 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. The output portion of the torque limiter is circumferentially locked to a torque input assembly of the torque transmission device.

[0030] The present disclosure also relates to a vehicle comprising the transmission member as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and other features and advantages of the present disclosure will become more apparent through the following detailed description of exemplary embodiments in conjunction with the accompanying drawings, which are provided for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way. The following drawings are not drawn to scale with actual size, but are intended to illustrate the main points of the present disclosure. In the drawings:

[0032] Figure 1 is a schematic diagram of a transmission assembly according to one embodiment of the present disclosure.

[0033] Figure 2 is a cross-sectional view of a transmission assembly according to one embodiment of the present disclosure.

[0034] Figure 3 yes Figure 2 An enlarged view of a portion of FIG. 1 , showing details of the first hysteresis component and the second hysteresis component.

[0035] Figure 4 Shown Figure 3 The first cover disc in the embodiment shown.

[0036] Figure 5 Shown Figure 3 The pressure plate in the illustrated embodiment.

[0037] Figure 6 Shown Figure 3 Retaining disc in the embodiment shown.

[0038] Figure 7 Shown Figure 3 Hysteresis disk in the illustrated embodiment.

[0039] Figure 8 Shown Figure 3 The drive plate in the embodiment shown.

[0040] Figure 9 Shown Figure 3 The stop disc in the embodiment shown.

[0041] Figure 10 The cooperation of the hysteresis disk and the stop disk is shown in an enlarged view.

[0042] Figure 11 Shown Figure 3 First hysteresis spring in the embodiment shown.

[0043] Figure 12 Shown Figure 3 Second hysteresis spring in the embodiment shown.

[0044] In the various drawings, the same or similar components are denoted by the same reference numerals. DETAILED DESCRIPTION

[0045] In order to make the objectives, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure.

[0046] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by those of ordinary skill in the art to which this disclosure pertains. Words such as "one," "an," or "the" and the like used in the patent application specification and claims of this disclosure do not indicate a quantity limitation, but rather indicate the presence of at least one. Words such as "include" or "comprise" mean that the elements or objects preceding the word encompass the elements or objects listed after the word and their 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 limit the order or importance of the corresponding elements. 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." Words such as "up," "down," "left," and "right" are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. Directions such as “axial”, “radial” and “circumferential” are defined relative to the rotation axis X of the torque transmission device, the axial direction being the direction in which the rotation axis X extends, the radial direction being the direction perpendicular to the rotation axis X, and the circumferential direction being the direction around the rotation axis X.

[0047] Figure 1 is a schematic diagram of a transmission assembly 1 according to an embodiment of the present disclosure. Figure 2 yes Figure 1 Exploded view of the transmission assembly shown.

[0048] The transmission assembly 1 can be used to transmit torque between the engine and gearbox of a vehicle. 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 the crankshaft of the vehicle engine and is driven by the crankshaft to transmit torque about the rotation axis X. The torque transmission device 100 is located as a whole inside the torque limiter 200 and outputs the torque transmitted by the torque limiter 200 to the gearbox of the vehicle. The torque limiter 200 includes an input part 210 and an output part 220. The torque transmitted from the input part 210 to the output part 220 has a predetermined threshold value. When the torque generated by the engine exceeds the predetermined threshold value, relative slip will occur between the input part 210 and the output part 220 in the circumferential direction, so that the torque transmitted to the output part 220 does not exceed the predetermined threshold value.

[0049] refer to Figure 1 and Figure 2 The torque transmission device 100 includes a torque input assembly 110 and a torque output assembly 120, which are arranged around a rotation axis X and can rotate around the rotation axis X, and a damping spring 130 arranged to be compressed circumferentially 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 coil spring, one end of which is acted upon by the torque input assembly 110 and the other end of which acts on the torque output assembly 120 to transmit torque between the torque input assembly 110 and the torque output assembly 120. In other words, the torque transmission device 100 can be implemented as a torsional vibration damper.

[0050] The torque input assembly 110 can deflect relative to the torque output assembly 120, and this deflection angle varies depending on the magnitude and direction of the torque transmitted between the two. When the transmitted torque is large, the spring 130 is compressed more, and the torque input assembly 110 deflects more relative to the torque output assembly 120. When the transmitted torque is small, the spring 130 is compressed less, and the torque input assembly 110 deflects less relative to the torque output assembly 120. Depending on the direction of torque transmission, the direction of deflection of the torque input assembly 110 relative to the torque output assembly 120 can also vary. For example, when the torque input assembly 110 drives the torque output assembly 120, torque is transmitted from the torque input assembly 110 to the torque output assembly 120, causing the torque input assembly 110 to deflect in a positive direction (e.g., counterclockwise). When the torque input assembly 110 is being pulled by the torque output assembly 120, torque is transmitted from the torque output assembly 120 to the torque input assembly 110, causing the torque input assembly 110 to deflect in a negative direction (e.g., clockwise).

[0051] When the torque transmitted by torque transmission device 100 changes, relative rotation occurs between torque input assembly 1100 and torque output assembly 120, causing the deflection angle of torque input assembly 110 to change. Furthermore, when the torque generated by the vehicle engine fluctuates, relative rotation may also occur between torque input assembly 110 and torque output assembly 120. This relative rotation manifests as circumferential oscillation of torque input assembly 110 at a specific deflection angle. Spring 130 absorbs and mitigates torque fluctuations through compression and expansion.

[0052] To address the aforementioned relative rotation of the torque input assembly 110, the torque transmission device 100 further includes a hysteresis assembly that dampens torque fluctuations and adjusts the dynamic torque transmission characteristics of the torque transmission device 100. Specifically, the hysteresis assembly retards the relative rotation between the torque input assembly 110 and the torque output assembly 120 through friction. As will be described in detail below, the hysteresis assembly includes a first hysteresis assembly 2 having a first hysteresis H1 and a second hysteresis assembly 4 having a second hysteresis H2. When the relative rotation between the torque input assembly 110 and the torque output assembly 120 is less than a predetermined threshold, both the first hysteresis assembly 2 and the second hysteresis assembly 4 provide hysteresis, resulting in a total hysteresis of H = H1 + H2 for the torque transmission device 100. 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, only the second hysteresis assembly 4 provides hysteresis, resulting in a total hysteresis of H = H2 for the torque transmission device 100.

[0053] Further references 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 so as to rotate together with the first cover plate 10a. Figure 3 In the illustrated embodiment, the second cover plate 10b is fixed to the output portion 220 of the torque limiter 200 and is thereby driven by the torque limiter 200. The torque output assembly 120 includes a drive plate 20 and an output hub 60. The drive plate 20 is axially arranged between the first cover plate 10a and the second cover plate 10b, and the output hub 60 is circumferentially fastened to the drive plate 20 and can be coupled to a downstream component such as a gearbox input shaft to output torque.

[0054] exist Figure 3 In the illustrated embodiment, the first hysteresis assembly 2 of the torque transmitting device 100 includes a retaining plate 30 , a hysteresis plate 40 , a pressure plate 50 , a stop plate 80 and a first hysteresis spring 3 .

[0055] The retaining plate 30 is fastened to the first cover plate 10a so as to rotate together with the first cover plate 10a. Figure 6In the exemplary embodiment shown, the retaining disk 30 includes a first radially extending portion 31, a second radially extending portion 32 radially outward of and axially spaced from the first radially extending portion 31, and an axially extending portion 33 connecting the first radially extending portion 31 and the second radially extending portion 32. The retaining disk 30 is riveted to the first cover disk 10a at the first radially extending portion 31. Alternatively, the retaining disk 30 may be fastened to the first cover disk 10a using other connection methods, such as threaded connections.

[0056] The retaining plate 30 and the first cover plate 10a are located on the same side of the driving plate 20 in the axial direction ( Figure 3 The hysteresis disc 40, the pressure disc 50, and the first hysteresis spring 3 of the first hysteresis assembly 2 are axially arranged between the retaining disc 30 and the first cover disc 10a, and are specifically retained between the second radially extending portion 32 and the first cover disc 10a. The pressure disc 50 is also circumferentially locked relative to the first cover disc 10a. Specifically, the first cover disc 10a is provided with a second locking hole 11, and the pressure disc 50 includes a second locking tooth 51 (refer to FIG. 5 ) extending axially toward the first cover disc 10a and inserted into the locking hole 11. Figure 5 The circumferential dimensions of the second locking teeth 51 and the second locking holes 11 are substantially equal, thereby circumferentially locking the pressure plate 50 relative to the first cover plate 10a. The second locking holes 11 do not hinder the axial movement of the second locking teeth 51, allowing the pressure plate 50 to move axially relative to the first cover plate 10a.

[0057] The first hysteresis spring 3 is axially arranged between the pressure plate 50 and the first cover plate 10a, and the hysteresis plate 40 is arranged between the pressure plate 50 and the second radial extension 32 of the retaining plate 30. Figure 3 Combined with Figure 11 The first hysteresis spring 3 is in the form of a disc spring, which axially biases the pressure plate 50 toward the hysteresis plate 40 and further axially biases the hysteresis plate 40 against the second radially extending portion 32 of the retaining plate 30. That is, the hysteresis plate 40 contacts the pressure plate 50 and the retaining plate 30 from above and below, respectively. Preferably, the first hysteresis spring 3 is circumferentially locked to the pressure plate 50 (e.g., through engagement between radially outwardly extending legs and locking teeth 51 of the pressure plate 50), and further circumferentially locked to the first cover plate 10a.

[0058] As described above, the retaining plate 30, pressure plate 50, and first hysteresis spring 3 of the first hysteresis assembly 2 are all circumferentially locked to the first cover plate 10a, thereby rotating along with the torque input assembly 110. When the relative rotation between the torque input assembly 110 and the torque output assembly 120 is less than a predetermined threshold, the hysteresis plate 40 has free travel for circumferential rotation relative to the drive plate 20, allowing it to be driven by the retaining plate 30 and pressure plate 50 to rotate along 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 hysteresis plate 40 is stopped by the drive plate 20, thereby being driven by the drive plate 20 to rotate along with the torque output assembly 120.

[0059] To this end, the first hysteresis assembly 2 includes a first stop portion rotationally locked with the hysteresis disc 40 and a second stop portion rotationally locked with the drive disc 20. When the hysteresis disc 40 rotates relative to the drive disc 20 to the end of its free stroke, the first stop portion abuts against the second stop portion, so that the hysteresis disc 40 is stopped by the drive disc 20.

[0060] In the embodiment shown in the drawings, the hysteresis disc 40 and the driving disc 20 are coupled via a stop disc 80. Figure 3 、 Figure 10 Combined with Figure 7-Figure 9 The stop plate 80 is integrally arranged radially outward of the retaining plate 30 and includes first stop teeth 81 extending axially toward the hysteresis plate 40. The hysteresis plate 40, in turn, includes radially extending second stop teeth 41. The second stop teeth 41 are inserted into the circumferential spaces between adjacent first stop teeth 81, thereby circumferentially coupling the hysteresis plate 40 to the stop plate 80. The stop plate 80 also includes first locking teeth 82, which are inserted into first locking holes 21 provided in the drive plate 20. The circumferential dimensions of the first locking teeth 82 and the first locking holes 21 are substantially equal, circumferentially locking the stop plate 80 to the drive plate 20. The circumferential spacing between the first stop teeth 81 is greater than the circumferential dimensions of the second stop teeth 41. Therefore, the hysteresis plate 40 and the stop plate 80 are not completely locked circumferentially, but can rotate relative to each other within a certain angular range (e.g., approximately 3°). Thus, the second stop teeth 41 form a first stop portion, and the first stop teeth 81 form a second stop portion.

[0061] In an alternative embodiment not shown in the drawings, the hysteresis disk 40 and the stop disk 80 can be configured to be circumferentially locked, while the stop disk 80 is configured to rotate relative to each other within a certain angular range (e.g., approximately 3°). In such an embodiment, the circumferential spacing between the first stop teeth 81 of the stop disk 80 is approximately equal to the circumferential dimension of the second stop teeth 41, while the circumferential dimension of the first locking hole 21 of the drive disk 20 is greater than the circumferential dimension of the first locking teeth 82 of the stop disk 80. In this case, the first locking teeth 82 form a first stop, while the second locking hole 21 forms a second stop.

[0062] Alternatively, the stop plate can be omitted, and the hysteresis plate 40 can be directly coupled to the drive plate 20. In such an embodiment, a stop hole can be provided in the drive plate 20, and a third stop tooth extending axially toward the drive plate 20 can be provided on the hysteresis plate 40. The third stop tooth is inserted into the stop hole, and the circumferential dimension of the third stop tooth is set to be smaller than the circumferential dimension of the stop hole. In this case, the third stop tooth forms the first stop portion, and the stop hole forms the second stop portion.

[0063] 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 first stop portion (the second stop tooth 41, the first locking tooth 82, or the third stop tooth) rotates against the second stop portion (the first stop tooth 81, the second locking hole 21, or the stop hole), causing the hysteresis plate 40 to be stopped by the drive plate 20 and to rotate relative to the retaining plate 30 and the pressure plate 50. The friction between the hysteresis plate 40 and the retaining plate 30 generates a first sub-hysteresis h1, while the friction between the hysteresis plate 40 and the pressure plate 50 generates a second sub-hysteresis h2. The first hysteresis H1 generated by the first hysteresis assembly 2 is composed of the first sub-hysteresis h1 and the second sub-hysteresis h2, i.e., H1 = h1 + h2.

[0064] When the relative rotation between the torque input assembly 110 and the torque output assembly 120 is less than a predetermined threshold, the first stop portion (the second stop tooth 41, the first locking tooth 82, or the third stop tooth) can rotate relative to the second stop portion (the first stop tooth 81, the second locking hole 21, or the stop hole). The hysteresis plate 40 is now within its free travel relative to the drive plate 20 and, clamped by the retaining plate 30 and the pressure plate 50, rotates with them. Hysteresis is no longer generated by friction between the hysteresis plate 40, the retaining plate 30, and the pressure plate 50, and the first hysteresis assembly 2 no longer functions as a hysteresis component.

[0065] exist Figure 3 In the illustrated embodiment, the second hysteresis assembly 4 of the torque transmitting device 100 includes a first bushing 70 a , a second bushing 70 b , a collar 6 , and a second hysteresis spring 5 .

[0066] refer to Figure 3 Combined with Figure 12The first bushing 70a and the second bushing 70b are respectively mounted on the output hub 60 on both axial sides of the drive disc 20. The first bushing 70a and the second bushing 70b are respectively locked circumferentially with the first cover disc 10a and the second cover disc 10b, so that they rotate together with the torque input assembly 110. Figure 12 The second hysteresis spring 5 is in the form of a disc spring and is axially arranged between the first cover plate 10a and the first bushing 70a to axially bias the first bushing 70a toward the output hub 60. Preferably, the second hysteresis spring 5 is circumferentially locked to the first bushing 70a (e.g., by engagement between teeth extending radially inwardly and corresponding locking structures on the first bushing 70a), and thus rotates along with the torque input assembly 110.

[0067] The first bushing 70a is axially biased against the output hub 60 by the second hysteresis spring 5. When the torque input assembly 110 and the torque output assembly 120 rotate relative to each other, the first bushing 70a rubs against the output hub 60, generating a third sub-hysteresis h3. The second bushing 70b contacts the drive plate 20, and the elastic force of the second hysteresis spring 5 also serves to axially bias the second bushing 70b against the drive plate 20. When the torque input assembly 110 and the torque output assembly 120 rotate relative to each other, the second bushing 70b rubs against the drive plate 20, generating a fourth sub-hysteresis h4. In an alternative embodiment (not shown), the first bushing 70a can also be configured to rub against the drive plate 20, or against both the drive plate 20 and the output hub 60. Similarly, the second bushing 70b can also be configured to rub against the output hub 60, or against both the output hub 60 and the drive plate 20.

[0068] The third sub-hysteresis h3 and the fourth sub-hysteresis h4 each constitute a portion of the second hysteresis H2 of the second hysteresis component 4. Regardless of the magnitude of the relative rotation of the torque input component 110 relative to the torque output component 120, the relevant components of the second hysteresis component 4 can still provide hysteresis, resulting in a second hysteresis H2 = h3 + h4.

[0069] As described above, it is desirable that 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 total hysteresis H=H1+H2 of the torque transmission device be as large as possible to quickly damp vibrations. Furthermore, when the relative rotation between the torque input assembly 110 and the torque output assembly 120 is less than the predetermined threshold, the total hysteresis H=H2 of the torque transmission device be as small as possible to reduce energy consumption and improve response speed to torque changes. Therefore, it is desirable to set the first hysteresis H1 of the first hysteresis assembly 2 to be as large as possible, and the second hysteresis H2 of the second hysteresis assembly 4 to be as small as possible.

[0070] To this end, the spring constant of the first hysteresis spring 3 of the first hysteresis assembly 2 is set to be greater than the spring constant of the second hysteresis spring 5 of the second hysteresis assembly 4. The hysteresis plate 40, the pressure plate 50, and / or the retaining plate 30 are made of metal, and the first bushing 70a and / or the second bushing 70b are made of plastic. The biasing force and friction coefficient between the hysteresis plate 40, the retaining plate 30, and the pressure plate 50 are both relatively large, thereby achieving a larger first sub-hysteresis h1 and second sub-hysteresis h2, and thus a larger first hysteresis H1. The biasing force and friction coefficient between the first bushing 70a and the second bushing 70b and the output hub 60 and / or the drive plate 20 are relatively small, thereby achieving a smaller third sub-hysteresis h3 and fourth sub-hysteresis h4, and thus a smaller second hysteresis H2. For example, the first hysteresis spring 3 is made of metal, and the second hysteresis spring 5 is made of plastic.

[0071] According to another aspect of the present disclosure, a vehicle is provided, comprising the transmission assembly 1 as described above. The vehicle is particularly a hybrid vehicle.

[0072] Certain features, structures or characteristics in one or more embodiments of the present disclosure may be appropriately combined.

[0073] The above is an illustration of the present disclosure and should not be considered as a limitation thereof. Although several exemplary embodiments of the present disclosure have been described, it will be readily understood by those skilled in the art 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 by the claims. It should be understood that the above is an illustration of the present disclosure and that the present disclosure should not be considered as limited to the specific embodiments disclosed, and that modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of the present disclosure.

Claims

1. A torque transmission device (100), characterized in that: The torque transmission device (100) comprises: A torque input assembly (110) disposed about a rotation axis (X) includes a first cover plate (10a); a torque output assembly (120) disposed about a rotation axis (X), comprising a drive disc (20), wherein the torque output assembly (120) is rotatable relative to the torque input assembly (110); and a first hysteresis component (2) configured to hysteresis the relative rotation between the torque input component (110) and the torque output component (120) through friction, the first hysteresis component (2) having a first hysteresis amount H1; and a second hysteresis component (4) configured to retard relative rotation between the torque input component (110) and the torque output component (120) through friction, the second hysteresis component (4) having a second hysteresis amount H2; When the relative rotation between the torque input component (110) and the torque output component (120) is less than a predetermined threshold, only the second hysteresis component (4) plays a hysteresis role, so that the total hysteresis amount H=H2 of the relative rotation between the torque input component (110) and the torque output component (120); 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 hysteresis component (2) and the second hysteresis component (4) both play a hysteresis role, so that the total hysteresis amount H of the relative rotation between the torque input component (110) and the torque output component (120) is H1+H2.

2. The torque transmission device (100) according to claim 1, characterized in that The first hysteresis component (2) comprises: a retaining disc (30) fastened to the first cover disc (10a), wherein the first cover disc (10a) and the retaining disc (30) are axially located on the same side of the driving disc (20); A hysteresis disc (40), the hysteresis disc (40) is axially arranged between the first cover disc (10a) and the retaining disc (30) and is rotatable relative to the retaining disc (30), the hysteresis disc (40) has a free travel in the circumferential direction relative to the driving disc (20), and at the end of the free travel, the hysteresis disc (40) is stopped by the driving disc (20), a first hysteresis spring (3), the first hysteresis spring (3) being axially arranged between the first cover disk (10a) and the hysteresis disk (40) and axially biasing the hysteresis disk (40) onto the retaining disk (30), When the relative rotation between the torque input assembly (110) and the torque output assembly (120) is less than the predetermined threshold, the hysteresis disk (40) rotates along with the retaining disk (30). 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 hysteresis disk (40) is stopped by the driving disk (20), thereby rotating relative to the retaining disk (30), and the friction between the hysteresis disk (40) and the retaining disk (30) generates a first sub-hysteresis amount h1 that constitutes at least a part of the first hysteresis amount H1.

3. The torque transmission device (100) according to claim 2, characterized in that The torque output assembly (120) further includes an output hub (60) secured to the drive disc (20), and The second hysteresis component (4) comprises: A first bushing (70a) configured to be sleeved on the output hub (60) and circumferentially locked relative to the first cover disc (10a); a second hysteresis spring (5), the second hysteresis spring (5) being axially arranged between the first cover plate (10a) and the first bushing (70a) and axially biasing the first bushing (70a) onto the output hub (60) and / or the drive plate (20), When the torque input assembly (110) rotates relative to the torque output assembly (120), the first bushing (70a) rotates relative to the output hub (60) and / or the drive plate (20), and the friction between the first bushing (70a) and the output hub (60) and / or the drive plate (20) generates a third sub-hysteresis h3 that constitutes a part of the second hysteresis H2.

4. The torque transmission device (100) according to claim 2 or 3, characterized in that The first hysteresis assembly (2) further comprises 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 first hysteresis spring (3) and the hysteresis plate (40), such that the first hysteresis spring (3) axially biases the pressure plate (50) against the hysteresis plate (40), 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 hysteresis plate (40) rotates relative to the pressure plate (50), and the friction between the hysteresis plate (40) and the pressure plate (50) generates a second sub-hysteresis amount h2 that constitutes at least a part of the first hysteresis amount H1.

5. The torque transmission device (100) according to claim 3, characterized in that The second hysteresis assembly (4) further comprises: a second bushing (70b) configured to be sleeved on the output hub (60) and circumferentially locked relative to the first cover plate (10a), wherein the second bushing (70b) is axially biased against the output hub (60) and / or the drive plate (20) under the action of the second hysteresis spring (5). The second bushing (70b) and the first bushing (70a) are respectively located on both sides of the axial direction of the driving disc (20). When the torque input assembly (110) rotates relative to the torque output assembly (120), the second bushing (70b) rotates relative to the output hub (60) and / or the drive plate (20), and the friction between the second bushing (70b) and the output hub (60) and / or the drive plate (20) generates a fourth sub-hysteresis h4 that constitutes a part of the second hysteresis H2.

6. The torque transmission device (100) according to claim 2 or 3, characterized in that The first hysteresis assembly (2) further comprises a first stop portion rotationally locked with the hysteresis disc (40) and a second stop portion rotationally locked with the drive disc (20), wherein when the hysteresis disc (40) rotates relative to the drive disc (20) to the end of the free stroke, the first stop portion abuts against the second stop portion.

7. The torque transmission device (100) according to claim 6, characterized in that The first hysteresis assembly (2) further comprises a stop plate (80), wherein the stop plate (80) comprises a first stop tooth (81) extending axially toward the hysteresis plate (40). The hysteresis disk (40) includes a radially extending second stop tooth (41) inserted into a circumferential interval between two adjacent first stop teeth (81).

8. The torque transmission device (100) according to claim 7, characterized in that The driving disc (20) is provided with a first locking hole (21), and the stop disc (80) includes a first locking tooth (82) extending axially toward the driving disc (20) and inserted into the first locking hole (21), and the circumferential dimensions of the first locking tooth (82) and the first locking hole (21) are substantially equal, so that the stop disc (80) and the driving disc (20) are circumferentially locked. The circumferential spacing between the first stop teeth (81) of the stop disk (80) is greater than the circumferential size of the second stop teeth (41) of the hysteresis disk (40), The second stop tooth (41) forms the first stop portion, and the first stop tooth (81) forms the second stop portion.

9. The torque transmission device (100) according to claim 7, characterized in that The circumferential spacing between the first stop teeth (81) of the stop disc (80) is substantially equal to the circumferential size of the second stop teeth (41) of the hysteresis disc (40), so that the stop disc (80) and the hysteresis disc (40) are circumferentially locked. The driving disc (20) is provided with a first locking hole (21), the stop disc (80) comprises a first locking tooth (82) extending axially toward the driving disc (20) and inserted into the first locking hole (21), the circumferential dimension of the first locking hole (21) being larger than the circumferential dimension of the first locking tooth (82), The first locking tooth (82) forms the first stop portion, and the first locking hole (21) forms the second stop portion.

10. The torque transmission device (100) according to claim 6, characterized in that The driving disk (20) is provided with a stop hole, and the stop hole forms the second stop portion. The hysteresis disk (40) comprises a third stop tooth extending axially toward the driving disk (20), wherein the third stop tooth forms the first stop portion. The third stopping tooth is inserted into the stopping hole, and a circumferential dimension of the stopping hole is larger than a circumferential dimension of the third stopping tooth.

11. The torque transmission device (100) according to any one of claims 1 to 3, characterized in that The torque input assembly (110) further comprises a second cover plate (10b) fastened to the first cover plate (10a), wherein the second cover plate (10b) and the first cover plate (10a) are respectively located on two axial sides of the drive plate (20).

12. The torque transmission device (100) according to claim 2 or 3, characterized in that The retaining disc (30) includes a first radial extension portion (31), a second radial extension portion (32) located radially outside the first radial extension portion and axially spaced apart from the first radial extension portion (31), and an axial extension portion (33) connecting the first radial extension portion (31) and the second radial extension portion (32). The retaining disc (30) is riveted to the first cover disc (10a) at the first radial extension portion (31), and the hysteresis disc (40) is arranged between the first cover disc (10a) and the second radial extension portion (32).

13. The torque transmission device (100) according to claim 4, characterized in that A second locking hole (11) is provided on the first cover plate (10a), and the pressure plate (50) includes a second locking tooth (51) extending axially toward the first cover plate (10a) and inserted into the second locking hole (11), and the circumferential dimensions of the second locking tooth (51) and the second locking hole (11) are substantially equal.

14. The torque transmission device (100) according to claim 3, characterized in that The elastic coefficient of the first hysteresis spring (3) is greater than the elastic coefficient of the second hysteresis spring (5).

15. The torque transmission device (100) according to claim 3 or 14, characterized in that The first hysteresis spring (3) is made of metal, and / or The second hysteresis spring (5) is made of plastic.

16. The torque transmission device (100) according to claim 4, characterized in that The hysteresis disk (40), the pressure disk (50) and / or the retaining disk (30) are made of metal.

17. The torque transmission device (100) according to claim 5, characterized in that The first bushing (70a) and / or the second bushing (70b) are made of plastic.

18. The torque transmission device (100) according to any one of claims 1 to 3, characterized in that The torque transmission device (100) further includes a damping spring (130) configured to be compressed in a circumferential direction between the torque input assembly (110) and the torque output assembly (120).

19. A transmission assembly (1), characterized in that The transmission assembly (1) comprises: The torque transmission device (100) according to any one of claims 1 to 18, and A torque limiter (200) includes an input portion (210) and an output portion (220), wherein the torque limiter (200) is configured to transmit a torque less than a predetermined threshold from the input portion (210) to the output portion (220). The output portion (220) of the torque limiter (200) is circumferentially locked with the torque input assembly (110) of the torque transmission device (100).

20. A vehicle, characterized in that: The vehicle comprises a transmission assembly (1) according to claim 19.

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