Torsion-limiting shock absorber

Abstract

The utility model relates to a torsion limiting shock absorber which comprises a disc hub, a side plate, a flange, a cover plate and a friction tension disc, the side plate, the flange and the cover plate are sleeved on the periphery of the disc hub in an anti-torque mode, the friction tension disc is clamped between the side plate and the flange in the axial direction, and the friction tension disc is fixedly connected to the flange and abuts against the side plate to be in friction fit with the side plate. The friction tension disc comprises a through hole located in the center part and used for the input shaft to penetrate through and a plurality of tension teeth arranged on the inner periphery of the through hole at intervals, and each tension tooth extends from the inner periphery of the through hole to the center of the through hole in the radial direction generally. The outer spline is arranged on an input shaft of the gearbox and can be in interference engagement with the outer spline in the circumferential direction. By means of the circumferential interference meshing between the tension teeth and the external spline, knocking noise caused by a spline meshing gap between the input shaft and the disc hub can be reduced, and therefore the NVH performance of the torsion limiting damper can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of a transmission device of a hybrid vehicle, and in particular to a torque limiting vibration damper. Background Art

[0002] The torque limiting vibration damper is generally installed between the engine and the gearbox, and plays the functions of transmitting torque, reducing vibration and noise, and limiting torque protection. The torque limiting vibration damper includes a disc hub, a torque limiting part, and a vibration reducing part. The disc hub is connected to the input shaft of the gearbox through a spline. The torque limiting part and the vibration reducing part are arranged on the disc hub, and the torque limiting part is arranged on the radial outside of the vibration reducing part. The torque limiting part usually includes an active component and a driven component that can be twisted relative to each other. A friction pair is formed between the active component and the driven component to transmit the torque from the engine. When the transmitted torque exceeds a predetermined value, the active component and the driven component can be twisted relative to each other to consume the excess torque. The vibration reducing part includes a flange that is sleeved on the outer periphery of the disc hub in a torque-resistant manner and a damping member that abuts against the flange to form a damping pair with the flange, thereby transmitting the torque transmitted by the torque limiting part to the gearbox through the damping pair after vibration reduction and noise reduction.

[0003] However, in the above structure, since the input shaft of the gearbox and the disc hub, as well as the disc hub and the flange of the vibration damping part are connected by splines, there will inevitably be meshing clearances between these spline connections. Therefore, during power transmission, especially when the vehicle is in a towing condition, an engine-off condition, or a parking charging condition, the transmission system is prone to generate knocking and other noises due to these meshing clearances. Utility Model Content

[0004] The utility model aims to provide an improved torque limiting vibration damper, which can reduce the knocking noise caused by the spline meshing clearance between the input shaft and the disc hub of the gearbox.

[0005] According to an embodiment of the utility model, a torque-limiting vibration damper is proposed, which includes: a disc hub that is torque-resistantly sleeved on the input shaft of the gearbox and can rotate around the rotation axis of the input shaft, and a side plate, a flange and a cover plate that are torque-resistantly sleeved on the outer periphery of the disc hub, the flange being clamped between the side plate and the cover plate in an axial direction, wherein the torque-limiting vibration damper also includes a friction tension disk clamped between the side plate and the flange in the axial direction, the friction tension disk being fixedly connected to the flange and abutting against the side plate to form a friction fit with the side plate, the friction tension disk including a through hole located at a central portion for the input shaft to pass through and a plurality of tension teeth spaced apart on the inner circumference of the through hole, each of the tension teeth extending from the inner circumference of the through hole generally in a radial direction toward the center of the through hole, and being able to form an interference fit with an external spline arranged on the input shaft of the gearbox in a circumferential direction.

[0006] According to a preferred embodiment of the utility model, the friction tension disk comprises an abutment portion arranged around the through hole and abutting against the side plate, and surfaces of the abutment portion and the side plate abutting against each other are both formed as rough surfaces.

[0007] According to a preferred embodiment of the utility model, the friction tension disk further comprises a connecting portion recessed in the abutting portion along the axial direction toward the flange, and the connecting portion is used to fix the friction tension disk to the flange.

[0008] According to a preferred embodiment of the utility model, each tension tooth is sandwiched between two adjacent external splines along the circumferential direction, and the circumferential side surface of each tension tooth abuts against the circumferential side surfaces of two adjacent external splines in the circumferential direction.

[0009] According to a preferred embodiment of the present utility model, the number of the plurality of tension teeth is less than the number of the plurality of external splines, and more than two external splines are provided between every two adjacent tension teeth.

[0010] According to a preferred embodiment of the utility model, each tension tooth is configured to extend from the inner periphery of the through hole toward the center of the through hole in a manner inclined at an angle relative to the plane where the abutment portion of the friction tension disk is located toward a direction away from the flange.

[0011] According to a preferred embodiment of the utility model, a second diaphragm spring is arranged between the friction tension disk and the flange, and the second diaphragm spring is configured to apply an axial preload to press the friction tension disk against the side plate to form a damping pair between the side plate and the friction tension disk.

[0012] According to a preferred embodiment of the present utility model, the disc hub and the flange are formed integrally.

[0013] According to a preferred embodiment of the utility model, the torsion limiting vibration damper also includes a damping member arranged between the flange and the cover plate and a third diaphragm spring arranged between the damping member and the cover plate, and the third diaphragm spring is configured to apply an axial preload to press the damping member against the flange to form a damping pair between the damping member and the flange.

[0014] According to a preferred embodiment of the utility model, a plurality of installation windows are formed at respective corresponding positions of the side plate, the flange and the cover plate, the plurality of installation windows are arranged at intervals along the circumferential direction, and a coil spring is arranged in each installation window.

[0015] According to the torque limiting vibration damper of the utility model, on the one hand, by arranging a friction tension disk between the flange and the side plate that have a tendency of relative movement to form a friction pair, the damping vibration reduction effect can be improved without increasing the axial space size and cost; on the other hand, since the friction tension disk is formed with tension teeth that can form an interference fit with the external splines on the input shaft of the gearbox in the circumferential direction, the knocking noise caused by the spline meshing clearance between the input shaft of the gearbox and the disc hub can be reduced, thereby improving the NVH performance of the torque limiting vibration damper. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0017] Figure 1 A schematic cross-sectional view showing a partial structure of a torsion limiting vibration damper according to an embodiment of the utility model is shown.

[0018] Figure 2 Another schematic cross-sectional view showing a partial structure of a torsion limiting vibration damper according to an embodiment of the utility model.

[0019] Figure 3 A three-dimensional structural schematic diagram of a friction tension disk according to an embodiment of the utility model is shown.

[0020] Figure 4 A partial schematic diagram is shown when the friction tension disk according to an embodiment of the utility model is installed on the input shaft of the gearbox.

[0021] However, the drawings are not necessarily drawn according to the actual scale. DETAILED DESCRIPTION

[0022] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and embodiments, wherein the same or similar components in the drawings are indicated by the same reference numerals. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments.

[0023] In the description of the present application, unless otherwise specified, the terms "upper", "lower", "inner", "outer", etc. indicating directions or positional relationships are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. The directional words appearing in the following description are all directions shown in the drawings, and do not limit the specific structure of the present application.

[0024] In the description of the present utility model, it is also necessary to explain that, unless otherwise expressly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. In addition, it should be understood that the term "torque-resistant connection" means that two elements are connected in a manner that does not rotate relative to each other, so that torque can be transmitted between the two elements, and the torque-resistant connection can be achieved through interference fit, bolt connection, gear connection, welding, spline connection, bonding by adhesive, etc., or by forming the two mentioned elements into one piece. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0025] In order to better understand the present invention, Figures 1 to 4 A torsion damper according to an embodiment of the present utility model is described.

[0026] The torque limiting vibration damper according to the embodiment of the utility model is installed between the engine and the gearbox to transmit a torque not exceeding a predetermined value between the engine and the gearbox. The torque limiting vibration damper mainly includes a disc hub 10, a torque limiting part 20 and a vibration reducing part 30. The disc hub 10 is sleeved on the input shaft of the gearbox in a torque-resistant manner and is rotatably arranged around the rotation axis L of the input shaft of the gearbox. Specifically, a plurality of external splines 41 are formed on the input shaft of the gearbox, and a plurality of internal splines 11 that can be adapted to the plurality of external splines 41 are formed on the disc hub 10, whereby the disc hub 10 is connected to the input shaft of the gearbox, for example, by the mutual engagement of the external splines 41 and the internal splines 11. The torque limiting part 20 is connected to the flywheel of the engine, and the vibration reducing part 30 is installed on the radial inner side of the torque limiting part 20 and is connected to the disc hub 10 in a torque-resistant manner, whereby the power of the engine can be transmitted to the input shaft of the gearbox through the disc hub 10 after passing through the torque limiting protection of the torque limiting part 20 and the vibration reduction and noise reduction of the vibration reducing part 30 in sequence.

[0027] The torque limiting vibration damper includes a transmission plate 21, a friction plate 22, a pressure plate 23, a first diaphragm spring 24, and a side plate 25 and a cover plate 26 for clamping these components in the axial direction. The axial direction in this article refers to Figure 1 The direction D1 in the radial direction refers to Figure 1 The transmission plate 21, the friction plate 22, the pressure plate 23 and the first diaphragm spring 24 are arranged between the side plate 25 and the cover plate 26 along the axial direction D1 of the torque limiting vibration damper, and the transmission plate 21, the friction plate 22, the pressure plate 23, the first diaphragm spring 24, the side plate 25 and the cover plate 26, which are located outside the radial direction D2, together constitute the torque limiting part 20 of the torque limiting vibration damper.

[0028] The transmission plate 21 is generally annular and is connected to the flywheel of the engine in a torque-resistant manner, such as by bolts, so that the power of the engine is transmitted to the torque-limiting part 20 via this torque-resistant connection. One or two axial side surfaces of the transmission plate 21 are rough surfaces, so that friction fit can be formed with the friction plate 22.

[0029] Two friction plates 22 are respectively arranged on both sides of the transmission plate 21 along the axial direction D1. Each friction plate 22 is generally annular and is rotatably arranged around the rotation axis L of the input shaft. The transmission plate 21 and the friction plate 22 are twistably arranged relative to each other. Therefore, the friction plate 22 is not fixedly installed relative to the transmission plate 21, but abuts against the axial side surface of the transmission plate 21 under the action of the axial preload of the first diaphragm spring 24. The axial side surface of the friction plate 22 is a rough surface, thereby forming a friction fit between the transmission plate 21 and the friction plate 22.

[0030] This torque transmission through friction can limit the torque transmitted between the transmission plate 21 and the friction plate 22 to a certain predetermined value, that is, when the torque transmitted between the transmission plate 21 and the friction plate 22 exceeds the predetermined value, the transmission plate 21 and the friction plate 22 slip relative to each other. In other words, the torque limiting damper cannot transmit a torque exceeding a predetermined value between the transmission plate 21 and the friction plate 22, and can dissipate excess torque exceeding the predetermined value by slipping. The predetermined value can be, for example, 300 N·m, which is determined by relevant factors such as the friction coefficient of the friction plate 22 and the friction radius. Of course, those skilled in the art should understand that the predetermined value can fluctuate within the allowable error range.

[0031] Based on the application environment requirements and slip torque requirements of the torque limiting damper, the friction plate 22 can be made of dry friction material or wet friction material. The friction plate 22 can well control the friction coefficient between different components of the torque limiting damper by adjusting its surface roughness and selecting dry or wet friction material. Thus, the predetermined value of the transmitted torque can be defined accurately and in a controlled manner, so that when the predetermined value is exceeded, the transmission plate 21 and the friction plate 22 slip relative to each other to prevent excessive torque.

[0032] like Figure 1As shown, the friction plate 22 includes a first friction plate and a second friction plate, the first friction plate is arranged on the left side of the axial direction D1 of the transmission plate 21, and the second friction plate is arranged on the right side of the axial direction D1 of the transmission plate 21, and is arranged between the transmission plate 21 and the pressure plate 23. When the torque limiting part 20 is impacted, the first friction plate and the second friction plate can both be twisted relative to the transmission plate 21. In this way, the two opposite sides of the transmission plate 21 are respectively against the first friction plate and the second friction plate, thereby allowing the torque not exceeding the predetermined value to be uniformly transmitted through the friction cooperation between the transmission plate 21 and the first friction plate and the friction cooperation between the transmission plate 21 and the second friction plate, thereby reducing the vibration and noise caused by the unbalanced force between the components of the torque limiting part 20.

[0033] like Figure 1 As shown, the number of the first friction plate and the second friction plate are both one, but the number of the first friction plate and the second friction plate can be more than one according to the actual need of torque limiting. The first friction plate and the second friction plate can be made of the same material or different materials.

[0034] The pressure plate 23 is generally annular and is disposed on one side of the second friction plate close to the cover plate 26 and forms a friction fit with the second friction plate, so that the second friction plate and the pressure plate 23 can be twisted relative to the transmission plate 21. The pressure plate 23 is configured to enable the transmission plate 21 and the second friction plate to be closely abutted, so that the transmission plate 21 and the second friction plate can transmit torque through friction fit.

[0035] The first diaphragm spring 24 is disposed between the pressure plate 23 and the cover plate 26, and can load an axial preload toward the second friction plate via the pressure plate 23. Specifically, the outer periphery of the first diaphragm spring 24 abuts against the pressure plate 23 to obtain a fulcrum located at the outer periphery; the inner periphery of the first diaphragm spring 24 abuts against the cover plate 26 described later to obtain a fulcrum located at the inner periphery. Figure 1 As shown, the cover plate 26 may be formed with a step portion for abutting against the inner circumference of the first diaphragm spring 24, thereby axially and radially positioning the first diaphragm spring 24. By adjusting the size (e.g., degree of deformation) of the first diaphragm spring 24, the axial preload applied by the cover plate 26 to the friction plate 22 and the transmission plate 21 may be adjusted, thereby adjusting the maximum static friction force to which these components are subjected (i.e., the static friction force from the side plate 25 and the cover plate 26 to both sides of the transmission plate 21 and the friction plate 22 during the torque transmission operation of the torque limiting damper), and the maximum static friction force corresponds to a predetermined value of the torque that the torque limiting damper can transmit.

[0036] The side plate 25 and the cover plate 26 are generally annular and are connected to the hub 10 in a torque-proof manner. Figure 1As shown, the side plate 25 is arranged on the side of the first friction plate away from the transmission plate 21 and is connected to the first friction plate in a torque-resistant manner. The cover plate 26 is arranged on the side of the pressure plate 23 away from the transmission plate 21 and is connected to the pressure plate 23 in a torque-resistant manner, and the pressure plate 23 is connected to the second friction plate in a torque-resistant manner. Therefore, when the torque input by the engine exceeds a predetermined value, the first friction plate and the side plate 25, as well as the second friction plate and the pressure plate 23, the first diaphragm spring 24, and the cover plate 26 will be twisted relative to the transmission plate 21 at the same time, thereby limiting the torque exceeding the predetermined value from being transmitted between the transmission plate 21 and the friction plate 22.

[0037] Thus, in the torque limiting part 10, the transmission plate 21 can be used as the active part of the torque limiting part 20, and the friction plate 22, the pressure plate 23 and the first diaphragm spring 24, the side plate 25 and the cover plate 26 constitute a driven part that can be twisted relative to the active part. When the torque input by the engine does not exceed the predetermined value, the transmission plate 21 as the active part and the friction plate 22, the pressure plate 23 and the first diaphragm spring 24, the side plate 25 and the cover plate 26 as the driven parts will rotate synchronously around the rotation axis L of the input shaft as a whole, and when the torque input by the engine exceeds the predetermined value, the friction plate 22 slips and twists relative to the transmission plate 21, so that the part of the torque received that is greater than the predetermined value is converted into heat and consumed by means of the relative twisting between the friction plate 22 and the transmission plate 21, thereby limiting the torque exceeding the predetermined value from being transmitted between the active part and the driven part. Therefore, when the engine has a large impact, the torque limiting portion 20 can suppress the damage of components caused by the large impact, thereby protecting the components located downstream of its torque path, ensuring the service life of the components, and ensuring the reliable operation of the power transmission device.

[0038] Continue to refer Figure 1 The torque limiting vibration damper also includes a flange 31, a friction tension disk 32, a second diaphragm spring 33, a damping member 34 and a third diaphragm spring 35, which are clamped between the side plate 25 and the cover plate 26 along the axial direction D1 and arranged on the inner side of the friction plate 22, the pressure plate 23 and the first diaphragm spring 24 along the radial direction D2, wherein the part of the side plate 25 and the cover plate 26 located on the inner side of the radial direction D2, the flange 31, the friction tension disk 32, the second diaphragm spring 33, the damping member 34 and the third diaphragm spring 35 together constitute the vibration reduction part 30 of the torque limiting vibration damper.

[0039] The friction tension disk 32 is made of a flexible material (such as spring steel) and is sandwiched between the side plate 25 and the flange 31 along the axial direction D1, and the surfaces of the side plate 25 and the friction tension disk 32 that contact each other are formed into a rough surface, and the second diaphragm spring 33 is arranged between the friction tension disk 32 and the flange 31, thereby the second diaphragm spring 33 can press the friction tension disk 32 against the side plate 25 by applying an axial preload, and form a damping pair between the side plate 25 and the friction tension disk 32. The damping member 34 is made of a damping material and is sandwiched between the flange 31 and the cover plate along the axial direction D1, and the surfaces of the flange 31 and the damping member 34 that contact each other are formed into a rough surface, and the third diaphragm spring 35 is arranged between the damping member 34 and the cover plate, thereby the third diaphragm spring 35 can press the damping member 34 against the flange 31 by applying an axial preload, and form another damping pair between the damping member 34 and the flange 31.

[0040] In other words, the friction tension disk 32 and the damping member 34 are respectively arranged on both sides of the axial direction D1 of the flange 31, wherein the friction tension disk 32 can be pressed against the side plate 25 under the action of the axial load applied by the second diaphragm spring 33 to form a damping pair with the side plate 25, and the damping member 34 can be pressed against the flange 31 under the action of the axial load applied by the third diaphragm spring 35 to form another damping pair with the flange 31. By means of the damping pair between the friction tension disk 32 and the side plate 25, and the damping pair between the flange 31 and the damping member 34, the torque limiting vibration damper can achieve the purpose of attenuating vibration and reducing noise.

[0041] Generally, during power transmission, there will be a tendency for relative movement between the side plate 25 and the flange 31, and between the cover plate 26 and the flange 31. If such relative movement is not restricted, the overall vibration reduction effect of the vibration reduction part will be affected. According to the torque limiting vibration damper of the utility model, a friction pair is formed between the friction tension disk 32 and the side plate 25 by providing a friction tension disk 32, so that the damping vibration reduction effect can be improved without increasing the axial space size and cost of the torque limiting vibration damper.

[0042] Next, continue to refer to Figure 1 and Figure 2 , and combined with Figure 3 to Figure 4 The specific structure of the friction tension disk 32 of the present invention is described in detail.

[0043] The friction tension disk 32 is generally annular and fixedly connected to the flange 31. The friction tension disk 32 includes a through hole 321 at the center for the input shaft to pass through, an abutment portion 322 arranged around the through hole 321, and a connection portion 323 recessed from the abutment portion 322 toward the flange 31 along the axial direction D1.

[0044] The through hole 321 is generally circular, but the utility model is not limited thereto, and the through hole 321 can be any shape suitable for the input shaft of the gearbox. The abutment portion 322 abuts against the side plate 25, and the surfaces of the abutment portion 322 and the side plate 25 abutting against each other are both formed as rough surfaces, so that when the friction tension disk 32 is pressed against the side plate 25 under the action of the second diaphragm spring 33, a damping pair will be formed between the abutment portion 322 and the side plate 25. The connecting portion 323 is used to fix the friction tension disk 32 to the flange 31. For example, Figure 3 As shown, a fastening hole 324 is formed on the connecting portion 323, so that the fastener can pass through the fastening hole 324 to fix the friction tension disk 32 to the flange 31. Since the connecting portion 323 is recessed in the abutting portion 322 toward the flange 31, the fastener can be accommodated in the connecting portion 323, so it will not protrude from the abutting portion 322 and affect the friction pair formed by the abutting portion 322 and the side plate 25. Figure 3 As shown, the connection portion 323 is generally annular, but the present invention is not limited thereto. The connection portion 323 may be formed into a plurality of grooves spaced apart along the circumferential direction, and a plurality of fasteners may be correspondingly accommodated in the plurality of grooves.

[0045] In addition, if Figure 3 and Figure 4 As shown, the friction tension disk 32 also includes a plurality of tension teeth 325 spaced apart on the inner circumference of the through hole 321, each tension tooth 325 extending from the inner circumference of the through hole 321 generally in a radial direction toward the center of the through hole 321, each tension tooth 325 being clamped between two adjacent external splines 41 in a circumferential direction, and when the torque limiter is assembled, each tension tooth 325 can form an interference fit with the external spline 41 on the input shaft of the gearbox in the circumferential direction, and such circumferential interference fit can reduce the knocking noise caused by the spline meshing clearance between the input shaft of the gearbox and the disk hub, thereby improving the NVH performance of the torque limiter.

[0046] The "interference engagement" here means that the circumferential side surface of each tension tooth 325 can respectively abut against the circumferential side surfaces of two adjacent external splines 41 in the circumferential direction, preferably, they abut against each other tightly. Thus, the knocking noise caused by the meshing clearance between the external splines 41 on the input shaft and the internal splines 11 on the hub 10 can be reduced or even eliminated.

[0047] Preferably, the number of the plurality of tension teeth 325 is less than the number of the plurality of external splines 41, and two external splines 41 are provided between every two adjacent tension teeth 325. However, the present invention is not limited thereto, and more than two external splines 41 are provided between every two adjacent tension teeth 325. In addition, preferably, the plurality of tension teeth 325 may be unevenly arranged in the circumferential direction, and one external spline 41 may also be provided between every two adjacent tension teeth 325.

[0048] Combination Figure 1 As shown, each tension tooth 325 is inclined at an angle relative to the plane where the abutment portion 322 of the friction tension disk 32 is located, in a direction away from the flange 31. Figure 1 When the right side of the tension tooth 325 is inserted into the input shaft of the gearbox, the inclined setting of the tension tooth 325 can facilitate the installation of the input shaft. Preferably, a circular arc transition is formed between each tension tooth 325 and the inner periphery of the through hole 321, thereby preventing structural damage caused by stress concentration at the root of the tension tooth 325.

[0049] Preferably, if Figure 1 As shown, the flange 31 is formed integrally with the disc hub 10. Compared with the structure in which the flange 31 and the disc hub 10 are connected by splines, this integrated structure can further reduce the knocking noise caused by the spline meshing clearance, thereby further improving the NVH performance of the torque limiting vibration damper.

[0050] In addition, if Figure 2 As shown, the side plate 25, the cover plate 26 and the flange 31 are provided with a plurality of mounting grooves at their corresponding positions, and a damping spring 36 is installed in each mounting groove. Therefore, when the torque transmitted by the torque limiting part 10 is transmitted to the damping part 30 through the side plate 25 and the cover plate 26, the torque will be first transmitted to the damping spring 36, and then the damping spring 36 will deform in the circumferential direction, and then the torque will be transmitted to the flange 31 and the disc hub 10 formed integrally with the flange 31, and then the disc hub 10 will further transmit the torque to the input shaft of the gearbox through the spline connection.

[0051] Preferably, there are multiple damping springs 32, which are evenly spaced and installed in corresponding mounting grooves along the circumferential direction, thereby transmitting torque more evenly, thereby reducing vibration and noise caused by unbalanced force between components of the torque limiting vibration damper.

[0052] As mentioned above, the friction tension disk 32 is pressed against the side plate 25 under the action of the axial load applied by the second diaphragm spring 33 to form a damping pair with the side plate 25, and the damping element 34 is pressed against the flange 31 under the action of the axial load applied by the third diaphragm spring 35 to form another damping pair with the flange 31. It can be seen that the flange 31 is subjected to axial clamping force from the diaphragm spring (i.e., the second diaphragm spring 33 and the third diaphragm spring 35) on both sides of the axial direction D1. Therefore, even when the engine is running at high speed, the axial movement of the flange 31 will be effectively suppressed, so the torque limiting vibration damper has better axial stability and more stable dynamic damping effect.

[0053] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and elements thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A torque limiting vibration damper, characterized in that: include: A disk hub (10) which is sleeved on the input shaft of a gearbox in a torque-resistant manner and can rotate around the rotation axis of the input shaft, and a side plate (25), a flange (31) and a cover plate (26) which are sleeved on the outer periphery of the disk hub (10) in a torque-resistant manner, wherein the flange (31) is sandwiched between the side plate (25) and the cover plate (26) in the axial direction, wherein: The torque limiting vibration damper further comprises a friction tension disk (32) sandwiched between the side plate (25) and the flange (31) along the axial direction, wherein the friction tension disk (32) is fixedly connected to the flange (31) and abuts against the side plate (25) to form a friction fit with the side plate (25). The friction tension disk (32) comprises a through hole (321) located at a central portion for the input shaft to pass through, and a plurality of tension teeth (325) arranged at intervals on the inner circumference of the through hole (321), each of the tension teeth (325) extending from the inner circumference of the through hole (321) in a radial direction toward the center of the through hole (321), and capable of forming an interference fit with an external spline (41) arranged on the input shaft of the gearbox in a circumferential direction.

2. The torque limiting vibration damper according to claim 1, characterized in that: The friction tension disk (32) further comprises an abutment portion (322) arranged around the through hole (321), the abutment portion (322) abuts against the side plate (25), and the surfaces of the abutment portion (322) and the side plate (25) abutting against each other are both formed as rough surfaces.

3. The torque limiting vibration damper according to claim 2, characterized in that: The friction tension disk (32) further comprises a connecting portion (323) which is recessed in the abutting portion (322) along the axial direction toward the flange (31), and the connecting portion (323) is used to fix the friction tension disk (32) to the flange (31).

4. The torque limiting vibration damper according to claim 1, characterized in that: Each tension tooth (325) is sandwiched between two adjacent external splines (41) along the circumferential direction, and the circumferential side surfaces of each tension tooth (325) respectively abut against the circumferential side surfaces of the two adjacent external splines (41) in the circumferential direction.

5. The torque limiting vibration damper according to claim 2, characterized in that: Each tension tooth (325) is configured to extend from the inner periphery of the through hole (321) toward the center of the through hole (321) in a manner inclined at an angle relative to the plane where the abutment portion (322) of the friction tension disk (32) is located in a direction away from the flange (31).

6. The torque limiting vibration damper according to claim 1, characterized in that: The number of the plurality of tension teeth (325) is less than the number of the plurality of external splines (41), and more than two external splines (41) are provided between every two adjacent tension teeth (325).

7. The torque limiting vibration damper according to any one of claims 1 to 6, characterized in that: A second diaphragm spring (33) is arranged between the friction tension disk (32) and the flange (31), and the second diaphragm spring (33) is configured to apply an axial preload to press the friction tension disk (32) against the side plate (25) to form a damping pair between the side plate (25) and the friction tension disk (32).

8. The torque limiting vibration damper according to any one of claims 1 to 6, characterized in that: The hub (10) and the flange (31) are formed integrally.

9. The torque limiting vibration damper according to any one of claims 1 to 6, characterized in that: The torsion damper further comprises a damping member (34) arranged between the flange (31) and the cover plate (26) and a third diaphragm spring (35) arranged between the damping member (34) and the cover plate (26), wherein the third diaphragm spring (35) is configured to apply an axial preload to press the damping member (34) against the flange (31) to form a damping pair between the damping member (34) and the flange (31).

10. The torque limiting vibration damper according to any one of claims 1 to 6, characterized in that: The side plate (25), the flange (31) and the cover plate (26) are provided with a plurality of installation windows at respective corresponding positions. The plurality of installation windows are arranged at intervals along the circumferential direction, and a coil spring (36) is arranged in each installation window.

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