Torsion-limiting shock absorber

Abstract

The invention relates to a torsion-limiting shock absorber which comprises a cover plate, a transmission plate, a friction lining and a pressure disc, the transmission plate and the friction lining are arranged between the cover plate and the pressure disc, the cover plate is connected to a flywheel of an engine, the pressure disc presses the transmission plate and the friction lining against the cover plate, and when the transmission torque exceeds a preset value, the friction lining twists relative to the cover plate and the pressure disc. The torsion limiting damper further comprises a radial limiting piece, the radial limiting piece is arranged on the pressure disc, and the radial limiting piece protrudes out of the pressure disc in the axial direction of the torsion limiting damper so as to abut against the inner periphery and / or the outer periphery of the friction lining, so that displacement of the friction lining in the radial direction of the torsion limiting damper is limited. By means of the radial limiting piece, radial eccentricity of the torsion limiting shock absorber during impact sliding can be prevented, radial eccentricity caused by collision when the torsion limiting shock absorber falls off from a high position during transportation or carrying can be prevented, and therefore the service life of the torsion limiting shock absorber is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission devices for hybrid vehicles, and particularly to a torque-limiting shock absorber. Background Art

[0002] A torque-limiting shock absorber is generally installed between an engine and a gearbox, and functions to transmit torque, reduce vibration and noise, and provide torque-limiting protection. The torque-limiting shock absorber includes a torque-limiting part and a shock-absorbing part. Among them, the torque-limiting part usually includes a cover plate, a diaphragm spring, a pressure plate, a friction lining, and a transmission plate. The friction lining and the transmission plate are arranged between the cover plate and the pressure plate, and respectively form two friction surfaces with the pressure plate and the cover plate. When the power transmission system is impacted, for example, when the engine experiences a misfire shock or the wheel end is impacted by the road surface (such as in conditions like emergency braking, roads with high and low adhesion coefficients, uneven roads, etc.), the friction lining will slide to a certain extent with the pressure plate and the cover plate, thereby playing a role in torque-limiting protection.

[0003] However, during this slipping process, the torque-limiting shock absorber itself will exhibit a certain degree of radial eccentricity. Moreover, due to the fact that the flywheel of the engine also has a certain degree of radial and axial yaw vibration at high speeds, the components connected to the engine flywheel in the torque-limiting shock absorber will also show a certain degree of radial eccentricity. In addition, when handling or transporting the torque-limiting shock absorber, if it falls from a height or collides, it may also cause relative sliding between the pressure plate and the friction lining, resulting in radial eccentricity. This radial eccentricity phenomenon will cause an increase in the eccentricity of the torque-limiting shock absorber during use, leading to an eccentric knocking noise phenomenon in the entire transmission device, and may even cause the shock absorber to fail prematurely. Summary of the Invention

[0004] The object of the present invention is to provide an improved torque-limiting shock absorber, which can prevent the components of the torque-limiting shock absorber from showing radial eccentricity when experiencing impact sliding or being impacted, thereby preventing these components from failing prematurely due to wear caused by radial eccentricity, extending the service life of the torque-limiting shock absorber, and preventing NVH noise problems from occurring in the whole vehicle after being impacted.

[0005] According to an embodiment of the present invention, a torque-limiting damper is provided, which includes a cover plate, a driving plate, a friction lining, and a pressure plate. The driving plate and the friction lining are disposed between the cover plate and the pressure plate. The cover plate is connected to the flywheel of the engine, and the pressure plate presses the driving plate and the friction lining against the cover plate. When the transmitted torque exceeds a predetermined value, the friction lining can twist relative to the cover plate and the pressure plate. Moreover, the torque-limiting damper further includes the radial limiting member, which is disposed on the pressure plate and protrudes axially of the torque-limiting damper from the pressure plate, so as to abut against the inner peripheral edge and / or the outer peripheral edge of the friction lining to limit the radial displacement of the friction lining along the torque-limiting damper.

[0006] According to a preferred embodiment of the present invention, the radial limiting member includes a first limiting member, which is disposed at the inner peripheral edge of the pressure plate. The first limiting member extends axially of the torque-limiting damper from the inner peripheral edge of the pressure plate toward the friction lining, such that the inner peripheral edge of the friction lining abuts against the first limiting member.

[0007] According to a preferred embodiment of the present invention, the first limiting member has an annular structure disposed around the inner peripheral edge of the pressure plate.

[0008] According to a preferred embodiment of the present invention, the first limiting member has a plurality of first limiting portions, and the plurality of first limiting portions are arranged at intervals along the inner peripheral edge of the pressure plate.

[0009] According to a preferred embodiment of the present invention, the radial limiting member includes a second limiting member, which is disposed at the outer peripheral edge of the pressure plate. The second limiting member extends axially of the torque-limiting damper from the outer peripheral edge of the pressure plate toward the friction lining, such that the outer peripheral edge of the friction lining abuts against the second limiting member.

[0010] According to a preferred embodiment of the present invention, the second limiting member has a plurality of second limiting portions, and the plurality of second limiting portions are arranged at intervals along the outer peripheral edge of the pressure plate.

[0011] According to a preferred embodiment of the present invention, each second limiting portion includes an abutting portion and a connecting portion connected to the abutting portion. The abutting portion extends axially of the torque-limiting damper, and the outer peripheral edge of the friction lining abuts against the abutting portion. The connecting portion extends radially outward along the torque-limiting damper from the abutting portion, and the connecting portion is connected to the cover plate.

[0012] According to a preferred embodiment of the present invention, the friction lining includes a first friction lining and a second friction lining, which are respectively arranged on both axial sides of the drive plate. The first friction lining and the second friction lining are respectively fixedly connected to the drive plate, and the inner peripheral edge and / or the outer peripheral edge of the drive plate also abut against the radial limiting member.

[0013] According to a preferred embodiment of the present invention, the torque-limiting damper further includes a first diaphragm spring, which is arranged on the side of the pressure plate away from the friction lining, and axially preloads towards the friction lining and the drive plate through the pressure plate, pressing the drive plate and the friction lining against the cover plate.

[0014] According to a preferred embodiment of the present invention, the torque-limiting damper further includes a flange arranged axially between the drive plate and the cover plate along the torque-limiting damper, and damping members arranged on opposite sides of the flange axially along the torque-limiting damper, forming a damping pair between the flange and the damping members.

[0015] Therefore, the present invention radially limits the friction lining by forming a bending structure on the pressure plate, thereby not only preventing radial eccentricity of the torque-limiting damper during impact sliding, but also preventing radial eccentricity caused by the torque-limiting damper falling and hitting from a height during transportation or handling, thus preventing NVH noise after the vehicle is impacted and extending the service life of the torque-limiting 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 cross-sectional schematic view showing a partial structure of a torque-limiting damper according to an embodiment of the present invention is shown.

[0018] Figure 2 Another cross-sectional schematic view showing a partial structure of a torque-limiting damper according to an embodiment of the present invention is shown.

[0019] Figure 3 A three-dimensional schematic view showing a partial structure of a torque-limiting damper according to an embodiment of the present invention is shown.

[0020] Figure 4 A three-dimensional schematic view showing an example of a pressure plate in a torque-limiting damper according to an embodiment of the present invention is shown.

[0021] Figure 5 A three-dimensional schematic view showing another example of a pressure plate in a torque-limiting damper according to an embodiment of the present invention is shown.

[0022] Among them, the drawings are not necessarily drawn to actual scale. DETAILED DESCRIPTION OF THE INVENTION

[0023] The following further describes in detail the embodiments of the present invention in conjunction with the accompanying drawings and embodiments, wherein the same or similar components in the drawings are labeled with the same reference numerals. The following detailed description of the embodiments and the drawings are used to exemplarily illustrate the principle 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.

[0024] In the following description of the present invention, it should be noted that unless otherwise specified, the meaning of "a plurality" is two or more; the orientation or positional relationship indicated by terms such as "inner", "outer", etc. is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. The orientation terms appearing in the following description are all the directions shown in the drawings, and do not limit the specific structure of the present invention.

[0025] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" 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 "anti-torque 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 these two elements, and the anti-torque connection can be achieved by means of interference fit, bolt connection, gear connection, welding, spline connection, bonding through an adhesive, etc., or by integrally forming the two elements mentioned. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] For a better understanding of the present invention, the following combines Figures 1 to 5 to describe the torque-limiting shock absorber according to the embodiments of the present invention.

[0027] The torque-limiting shock absorber according to the embodiment of the present invention is installed between the engine and the transmission to transmit torque not exceeding a predetermined value between the engine and the transmission. The torque-limiting shock absorber mainly includes a disk hub 10, a torque-limiting part 20, and a shock-absorbing part 30. The disk hub 10 is rotatably arranged around the rotation axis L of the torque-limiting shock absorber, and here the rotation axis L also refers to the rotation axis of the input shaft of the transmission. The torque-limiting part 20 is connected to the flywheel of the engine, the shock-absorbing part 30 is installed radially inside the torque-limiting part 20 and connected to the disk hub 10, and the disk hub 10 is sleeved on the input shaft of the transmission and connected to the input shaft of the transmission, for example, through splines. Thus, the power of the engine can be transmitted to the input shaft of the transmission through the torque-limiting protection of the torque-limiting part 20 and the shock absorption of the shock-absorbing part 30 via the disk hub 10.

[0028] The torque-limiting part 20 includes a cover plate 21, a driving plate 22, a friction lining 23, a first diaphragm spring 24, a pressure plate 25, etc. The driving plate 22 and the friction lining 23 are arranged axially along the torque-limiting damper between the cover plate 21 and the pressure plate 25. The axial direction herein refers to Figure 1 the direction D1 in Figure 1 and the radial direction refers to

[0029] the direction D2 in. The cover plate 21 is connected to the flywheel of the engine. The first diaphragm spring 24 abuts against the pressure plate 25, and presses the driving plate 22 and the friction lining 23 against the cover plate 21 through the pressure plate 25. Friction fits can be respectively formed between the friction lining 23 and the cover plate 21 and between the friction lining 23 and the pressure plate 25, and when the transmitted torque exceeds a predetermined value, the friction lining 23 can twist relative to the cover plate 21 and the pressure plate 25 respectively.

[0030] Thus, in the torque-limiting part 20, the cover plate 21 and the pressure plate 25 clamp the driving plate 22, the friction lining 23, and the first diaphragm spring 24 therebetween axially along the torque-limiting damper. The cover plate 21 can be used as the driving part of the torque-limiting part 20, while the driving plate 22, the friction lining 23, the first diaphragm spring 24, and the pressure plate 25 constitute the driven parts that can twist relative to the driving part. When the torque input by the engine does not exceed the predetermined value, the cover plate 21 as the driving part and the driving plate 22, the friction lining 23, the first diaphragm spring 24, and the pressure plate 25 as the driven parts will rotate synchronously as a whole around the rotation axis L of the torque-limiting damper. When the torque input by the engine exceeds the predetermined value, the friction lining 23 slips and twists relative to the cover plate 21 and the pressure plate 25 to convert the part of the torque greater than the predetermined value received into heat and consume it by means of the relative twist between the friction lining 23 and the cover plate 21 and / or between the friction lining 23 and the pressure plate 25, thereby limiting the transmission of a large impact torque between the cover plate 21 and the driving plate 22. Therefore, when the engine has a large impact, the torque-limiting part 20 can suppress the damage of parts caused by the large impact, thereby protecting the parts located downstream of its torque path, ensuring the service life of the parts, and guaranteeing the reliable operation of the power transmission device. Figure 1As shown, the vibration damping part 30 includes a flange 31 disposed between the drive plate 22 and the cover plate 21 along the axial direction D1 of the torque limiting damper, damping members 33 and 34 respectively pressed against both sides of the flange 31, and a second diaphragm spring 35 that applies an axial preload to the damping members 33 and 34 to press the damping members 33 and 34 against the flange 31. The flange 31 is anti-torque connected to the drive plate 22 and the cover plate 21 respectively, and the flange 31 is also anti-torque connected to the disk hub 10 to transfer torque from the cover plate 21 to the disk hub 10. Two opposite side surfaces of the flange 31 are formed as rough surfaces, whereby a damping pair can be formed between the flange 31 and the damping member 33 and between the flange 31 and the damping member 34. By means of these damping pairs, during the torque transmission process, the vibration damping part 30 can achieve the purpose of attenuating vibration and reducing noise. The damping member 33 can be made of, for example, a plastic material.

[0031] The drive plate 22, the cover plate 21, and the flange 31 are provided with a plurality of mounting grooves at corresponding positions, and a vibration damping spring 32 is installed in each mounting groove. The vibration damping spring 32 spans the drive plate 22, the cover plate 21, and the flange 31 along the axial direction D1 of the torque limiting damper. Thus, in the vibration damping part 30, the torque transmitted via the torque limiting part 20 can first be transmitted to the vibration damping spring 32 via the drive plate 22 and the cover plate 21, and then the vibration damping spring 32 deforms along the circumferential direction of the torque limiting damper to transmit the torque to the flange 31, and then the flange 31 further transmits the torque to the disk hub 10, and the disk hub 10 transmits the torque to the input shaft of the gearbox through connections such as splines. Correspondingly, the number of vibration damping springs 32 is multiple ( Figure 3 four vibration damping springs 32 are shown in the figure), and these vibration damping springs 32 are evenly spaced along the circumferential direction and installed in the corresponding mounting grooves, whereby the torque can be transmitted more evenly, thus reducing the vibration and noise caused by the unbalanced force between the components of the torque limiting damper.

[0032] Next, reference will continue to be made to Figure 1 describe the components of the torque limiting part 20 in detail.

[0033] The cover plate 21 is anti-torque connected to the flywheel of the engine, for example, by bolts, so the power of the engine is transmitted to the torque limiting part 20 through this anti-torque connection. The surface of the cover plate 21 close to the friction lining 23 is a rough surface, so that a friction fit can be formed with the friction lining 23.

[0034] The friction lining 23 is not fixedly mounted relative to the cover plate 21, but abuts against an axial side surface of the cover plate 21 under the action of the axial preload of the first diaphragm spring 24. The axial side surface of the friction lining 23 is a rough surface, whereby a frictional fit can be formed between the cover plate 21 and the friction lining 23. This torque transmission through friction can limit the torque transmitted between the cover plate 21 and the friction lining 23 to a certain predetermined value, that is, when the torque transmitted between the cover plate 21 and the friction lining 23 exceeds the predetermined value, the cover plate 21 and the friction lining 23 slip relative to each other. In other words, a torque exceeding the predetermined value cannot be transmitted between the cover plate 21 and the friction lining 23, and the excessive torque exceeding the predetermined value can be dissipated by slipping. The predetermined value can be, for example, 300 N·m. However, it should be understood that different torque-limiting shock absorbers have different predetermined values, which are determined by relevant factors such as the friction coefficient of the friction lining 23 and the friction radius. Of course, those skilled in the art should understand that the predetermined value can fluctuate within the allowable error range.

[0035] Based on the application environment requirements and the slipping torque requirements of the torque-limiting shock absorber, the friction lining 23 can be made of a dry friction material or a wet friction material. And the friction lining 23 can well control the friction coefficient between different components of the torque-limiting shock absorber by adjusting its surface roughness and selecting a dry or wet friction material. Thus, the predetermined value of the transmitted torque can be precisely and controllably defined, so that when the predetermined value is exceeded, the cover plate 21 and the friction lining 23 slip relative to each other to prevent excessive torque.

[0036] The drive plate 22 and the friction lining 23 are fixedly connected to each other, for example, by round head rivets 29. Therefore, when the torque input by the engine exceeds the predetermined value, the drive plate 22 and the friction lining 23 can twist as a whole relative to the cover plate 21.

[0037] Preferably, the friction lining 23 includes a first friction lining and a second friction lining, which are respectively arranged on the two axial sides of the drive plate 22. Specifically, the first friction lining is fixedly connected to the right side in the axial direction of the drive plate 22 and forms a friction fit with the cover plate 21, and the second friction lining is fixedly connected to the left side in the axial direction of the drive plate 22 and forms a friction fit with the pressure plate 25 described later. That is to say, the friction lining 23 is not fixedly installed relative to the cover plate 21 and the pressure plate 25, but is clamped between the cover plate 21 and the pressure plate 25 under the action of the axial preload of the first diaphragm spring 24, and forms a friction fit with the cover plate 21 and the pressure plate 25 respectively. Therefore, when the torque limiting part 20 is impacted, both the first friction lining and the second friction lining can be twisted relative to the cover plate 21 and the pressure plate 25, and thus the excessive torque exceeding the predetermined value is dissipated by slipping, so that the torque not exceeding the predetermined value can be evenly transmitted to the disk hub 10 through the friction fit between the cover plate 21 and the first friction lining and the friction fit between the pressure plate 25 and the second friction lining, thereby reducing the vibration and noise caused by the unbalanced force between the components of the torque limiting part 20.

[0038] Here, the number of both the first friction lining and the second friction lining is one, but according to the actual needs of torque limiting, the number of the first friction lining and the second friction lining can be multiple respectively. The first friction lining and the second friction lining can be made of the same material or different materials.

[0039] The first diaphragm spring 24 is arranged on the side of the pressure plate 25 away from the friction lining 23, and can apply an axial preload to the drive plate 22 and the friction lining 23 via the pressure plate 25, so as to press the drive plate 22 and the friction lining 23 against the cover plate 21. By adjusting the size (such as the degree of deformation) of the first diaphragm spring 24, the axial preload applied by the pressure plate 25 to the friction lining 23 can be adjusted, so as to adjust the maximum static friction force received by these components (that is, during the working process of the torque limiting damper for transmitting torque, the static friction forces received by the drive plate 22 and the two sides of the friction lining 23 from the cover plate 21 and the pressure plate 25), and this static friction force corresponds to the predetermined value of the torque that the torque limiting damper can transmit.

[0040] The pressure plate 25 is annular and presses against the friction lining 23 under the axial preload applied by the first diaphragm spring 24. The surface of the pressure plate 25 facing the friction lining 23 is a rough surface, so as to form a friction fit with the friction lining 23.

[0041] As described above, since the friction lining 23 is clamped between the cover plate 21 and the pressure plate 25 under the action of the axial preload of the first diaphragm spring 24, and it is not fixedly installed relative to the cover plate 21 and the pressure plate 25, during the slipping of the friction lining 23 relative to the cover plate 21 and the pressure plate 25, the friction lining 23 is prone to a certain degree of radial eccentricity, and this radial eccentricity is likely to cause the phenomenon of eccentric knocking noise in the entire transmission device, and may even cause the early failure of the shock absorber. In order to eliminate this radial eccentricity phenomenon, the torque-limiting shock absorber of the present invention is further provided with a radial limiting member 26. Next, in combination with Figures 1 to 5 The specific structure of the radial limiting member 26 according to the embodiment of the present invention will be described.

[0042] The radial limiting member 26 is provided on the pressure plate 25, and the radial limiting member 26 protrudes from the pressure plate 25 along the axial direction D1 of the torque-limiting shock absorber, so as to abut against the inner peripheral edge and / or the outer peripheral edge of the friction lining 23, so as to limit the displacement of the friction lining 23 along the radial direction D2 of the torque-limiting shock absorber. Since the radial limiting member 26 extends along the axial direction D1 of the torque-limiting shock absorber and abuts against at least one of the inner peripheral edge and the outer peripheral edge of the friction lining 23, the radial limiting member 26 can limit the radial eccentricity of the friction lining 23 relative to the pressure plate 25, so that not only can the radial eccentricity of the torque-limiting shock absorber during impact sliding be prevented, but also the radial eccentricity caused by the torque-limiting shock absorber falling and hitting from a high place during transportation or handling can be prevented, thereby preventing NVH noise after the whole vehicle is impacted and prolonging the service life of the torque-limiting shock absorber.

[0043] In order to achieve a better radial limiting effect, both the inner peripheral edge and the outer peripheral edge of the friction lining 23 abut against the radial limiting member 26. Accordingly, the radial limiting member 26 includes a first limiting member 27 provided at the inner peripheral edge of the pressure plate 25 and a second limiting member 28 provided at the outer peripheral edge of the pressure plate 25.

[0044] The first limiting member 27 extends from the inner peripheral edge of the pressure plate 25 along the axial direction D1 of the torque-limiting shock absorber towards the friction lining 23, so that the inner peripheral edge of the friction lining 23 abuts against the first limiting member 27. That is to say, the first limiting member 27 is a bending structure formed on the inner peripheral edge of the pressure plate 25, and it abuts against the inner peripheral edge of the friction lining 23 to limit the radial displacement of the friction lining 23.

[0045] The second limiting member 28 extends from the outer peripheral edge of the pressure plate 25 along the axial direction D1 of the torque-limiting shock absorber towards the friction lining 23, so that the outer peripheral edge of the friction lining 23 abuts against the second limiting member 28. That is, the second limiting member 28 is a bending structure formed on the outer peripheral edge of the pressure plate 25, and it abuts against the outer peripheral edge of the friction lining 23 to limit the radial displacement of the friction lining 23.

[0046] Since the drive plate 22 is fixedly connected to the friction lining 23, the first limiting member 27 and the second limiting member 28 can radially limit the drive plate 22 while radially limiting the friction lining 23. As described above, the drive plate 22 is disposed between the first friction lining and the second friction lining. Therefore, the inner peripheral edge of the drive plate 22 can abut against the first limiting member 27, and preferably, the outer peripheral edge of the drive plate 22 can abut against the second limiting member 28.

[0047] In one example, as Figure 4 shown, the first limiting member 27 has an annular structure disposed around the inner peripheral edge of the pressure plate 25. That is to say, the first limiting member 27 is a ring disposed around the inner peripheral edge of the pressure plate 25.

[0048] In another example, as Figure 5 shown, the first limiting member 27 has a plurality of first limiting portions 271, and the plurality of first limiting portions 271 are spaced apart along the inner peripheral edge of the pressure plate 25. Figure 5 Six first limiting portions 271 are shown in

[0049] and these first limiting portions 271 are evenly and spaced apart along the inner peripheral edge of the pressure plate 25. This arrangement can further prevent the friction lining from radially eccentric when subjected to impact or collision, thereby reducing NVH noise and prolonging the service life of the torque-limiting damper.

[0050] Preferably, an arc transition is formed at the connection between the first limiting member 27 and the inner peripheral edge of the pressure plate 25, thereby eliminating cracks and other phenomena caused by stress concentration at the connection position between the first limiting member 27 and the pressure plate 25.

[0050] The second limiting member 28 has a plurality of second limiting portions 281, and the plurality of second limiting portions 281 are spaced apart along the outer peripheral edge of the pressure plate 25. Figure 5 Three second limiting portions 281 are shown in

[0051] and these second limiting portions 281 are evenly and spaced apart along the inner peripheral edge of the pressure plate 25. This arrangement can further prevent the friction lining from radially eccentric when subjected to impact or collision, thereby reducing NVH noise and prolonging the service life of the torque-limiting damper.

[0051] Each second limiting portion 281 includes an abutting portion 282 and a connecting portion 283 connected to the abutting portion 282. The abutting portion 282 is connected to the outer peripheral edge of the pressure plate 25 and extends from the pressure plate 25 along the axial direction D1 of the torque-limiting damper toward the friction lining 23. The outer peripheral edge of the friction lining 23 abuts against the abutting portion 282. The connecting portion 283 extends outward from the abutting portion 282 along the radial direction D2 of the torque-limiting damper. The connecting portion 283 is fixedly connected to the cover plate 21. For example, the connecting portion 283 is riveted to the cover plate 21 by a leaf spring, as Figure 2As shown. Thus, the second limiting member 28 not only functions to radially limit the friction lining 23, but also functions to connect the pressure plate 25 to the cover plate 21 to achieve circumferential positioning of the pressure plate 25 relative to the cover plate 21.

[0052] Preferably, an arc transition is formed at the connection between the second limiting member 28 and the outer peripheral edge of the pressure plate 25, whereby cracks and other phenomena caused by stress concentration at the connection position between the second limiting member 28 and the pressure plate 25 can be eliminated.

[0053] In addition, as Figure 4 shown, along the circumferential direction of the pressure plate 25, a plurality of second limiting portions 281 and a plurality of first limiting portions 271 are arranged alternately with each other. That is to say, the first limiting portion 271 and the second limiting portion 281 are not opposite to each other in the radial direction D2 of the pressure plate 25. This alternating arrangement can enable the radial limiting member to radially limit the friction lining 23 at multiple positions along the circumferential direction of the pressure plate 25, thereby further preventing the friction lining 23 from occurring radial eccentricity when being impacted or struck.

[0054] Preferably, the first limiting member 27 and the second limiting member 28 can be integrally formed with the pressure plate 25. Therefore, a stamping process can be used to form the pressure plate, whereby the cost of the entire pressure plate 25 is lower and the precision is higher.

[0055] Although the present invention has been described with reference to the preferred embodiments, various improvements can be made to it and elements thereof can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A torque-limiting shock absorber, which comprises a cover plate (21), a drive plate (22), a friction lining (23) and a pressure plate (25), and is characterized in that, the drive plate (22) and the friction lining (23) are arranged between the cover plate (21) and the pressure plate (25), the cover plate (21) is connected to the flywheel of the engine, the pressure plate (25) presses the drive plate (22) and the friction lining (23) against the cover plate (21), and when the transmitted torque exceeds a predetermined value, the friction lining (23) can twist relative to the cover plate (21) and the pressure plate (25), and, the torque-limiting shock absorber further comprises the radial limiting member (26), the radial limiting member (26) is arranged on the pressure plate (25), and the radial limiting member (26) protrudes from the pressure plate (25) along the axial direction (D1) of the torque-limiting shock absorber, so as to abut against the inner peripheral edge and / or the outer peripheral edge of the friction lining (23) to limit the radial displacement (D2) of the friction lining (23) along the torque-limiting shock absorber.

2. The torque-limiting shock absorber according to claim 1, characterized in that, the radial limiting member (26) comprises a first limiting member (27), which is arranged at the inner peripheral edge of the pressure plate (25), and the first limiting member (27) extends from the inner peripheral edge of the pressure plate (25) along the axial direction (D1) of the torque-limiting shock absorber towards the friction lining (23), so that the inner peripheral edge of the friction lining (23) abuts against the first limiting member (27).

3. The torque-limiting shock absorber according to claim 2, characterized in that, the first limiting member (27) has an annular structure arranged around the inner peripheral edge of the pressure plate (25).

4. The torque-limiting shock absorber according to claim 2, characterized in that, the first limiting member (27) has a plurality of first limiting portions (271), and the plurality of first limiting portions (271) are arranged at intervals along the inner peripheral edge of the pressure plate (25).

5. The torque-limiting shock absorber according to any one of claims 1 to 4, characterized in that, the radial limiting member (26) comprises a second limiting member (28), which is arranged at the outer peripheral edge of the pressure plate (25), and the second limiting member (28) extends from the outer peripheral edge of the pressure plate (25) along the axial direction (D1) of the torque-limiting shock absorber towards the friction lining (23), so that the outer peripheral edge of the friction lining (23) abuts against the second limiting member (28).

6. The torque-limiting shock absorber according to claim 5, characterized in that, the second limiting member (28) has a plurality of second limiting portions (281), and the plurality of second limiting portions (281) are arranged at intervals along the outer peripheral edge of the pressure plate (25).

7. The torque-limiting shock absorber according to claim 6, characterized in that, Each second limiting portion (281) includes an abutting portion (282) and a connecting portion (283) connected to the abutting portion (282). The abutting portion (282) extends along the axial direction (D1) of the torque-limiting shock absorber. The outer peripheral edge of the friction lining (23) abuts against the abutting portion (282). The connecting portion (283) extends outward from the abutting portion (282) along the radial direction (D2) of the torque-limiting shock absorber, and the connecting portion (283) is connected to the cover plate (21).

8. The torque-limiting shock absorber according to claim 1, wherein the friction lining (23) includes a first friction lining (23) and a second friction lining (23), which are respectively arranged on the two axial sides of the driving plate (22). The first friction lining (23) and the second friction lining (23) are respectively fixedly connected to the driving plate (22), and the inner peripheral edge and / or the outer peripheral edge of the driving plate (22) abuts against the radial limiting member (26).

9. The torque-limiting shock absorber according to claim 1, wherein the torque-limiting shock absorber further includes a first diaphragm spring (24), which is arranged on the side of the pressure plate (25) away from the friction lining (23), and axially preloads the driving plate (22) and the friction lining (23) toward the friction lining (23) and the driving plate (22) through the pressure plate (25), pressing the driving plate (22) and the friction lining (23) against the cover plate (21).

10. The torque-limiting shock absorber according to claim 1, wherein the torque-limiting shock absorber further includes a flange (31) arranged between the driving plate (22) and the cover plate (21) along the axial direction (D1) of the torque-limiting shock absorber, and damping members (33, 34) arranged on the opposite sides of the flange (31) along the axial direction (D1) of the torque-limiting shock absorber. A damping pair is formed between the flange (31) and the damping members (33, 34).

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