Damping device

Abstract

The present application relates to a kind of damping devices.The damping device includes: side plate assembly, including coaxially fixedly connected and axially spaced apart first side plate and second side plate;Damping flange is axially between first side plate and second side plate;Damping spring is abutted between damping flange and side plate assembly along the direction of rotation;Output hub is coaxially arranged relatively rotatable with damping flange;And torque limiter, including at least one first friction disc with torsion connection of side plate assembly and at least one second friction disc with torsion connection of output hub, first friction disc and second friction disc can be mutually abutted in axial direction, to transmit torque by friction force;Wherein, first friction disc and second friction disc are axially on the side of second side plate towards first side plate, and second side plate can be mutually abutted with second friction disc on at least one axial side of its radial inner end.The damping device of the present application is simple in structure and low in cost.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology. Specifically, this invention relates to a vibration damping device for the transmission system of a motor vehicle. Background Technology

[0002] For the foreseeable future, motor vehicles will continue to be powered by internal combustion engines. Regardless of the type of transmission chosen, the fundamental requirement for torque transmission between the engine and transmission remains the same: to reduce torsional vibrations and rotational unevenness while starting and transmitting average torque. Therefore, vibration damping devices are typically installed between the engine and transmission to absorb and buffer vibrations from the torque output from the engine.

[0003] To prevent excessive torque from being transmitted to the transmission through the damping device, a torque limiter is sometimes required in the damping device. Figure 1 The structure of a torque limiter in the prior art is shown. As shown, this torque limiter includes an outer hub O and a friction plate assembly F. The outer hub O is torsionally connected to a flange or side plate of the damping device, and supports the flange or side plate radially outward. The friction plate assembly F is similar to the friction plate assembly of a friction clutch, comprising a set of friction discs torsionally connected to the outer hub O via splines and another set of friction discs torsionally connected to the output hub H of the damping device via splines. The two sets of friction discs are arranged alternately in the axial direction and are constrained at both ends of the axial direction by a radially extending section of the outer hub O and a retaining ring mounted on the outer hub O, respectively. These friction discs abut against each other by an axial compressive force applied by a diaphragm spring abutting between the retaining ring and the end friction discs, thereby enabling the transmission of a limited torque between the outer hub O and the output hub H through friction.

[0004] In this type of vibration damping device, the torque limiter has an integrated structure, which is located in the radial space between the side plate and flange and the output hub, thus saving axial space. However, this type of vibration damping device has a large number of torque limiter components, so the structure is relatively complex and the cost is high. Summary of the Invention

[0005] Therefore, the technical problem that this invention needs to solve is to provide a vibration damping device that is simple in structure and low in cost.

[0006] The aforementioned technical problem is solved by a vibration damping device according to the present invention. The vibration damping device includes: a side plate assembly comprising a first side plate and a second side plate coaxially fixedly connected and axially spaced apart; a vibration damping flange coaxially arranged with respect to the side plate assembly and axially located between the first and second side plates; a vibration damping spring abutting against the vibration damping flange and the side plate assembly in the direction of rotation; an output hub coaxially arranged with respect to the vibration damping flange; and a torque limiter comprising at least one first friction disc anti-torsionally connected to the side plate assembly and at least one second friction disc anti-torsionally connected to the output hub, the first and second friction discs being axially abutting against each other to transmit torque through friction; wherein the at least one first friction disc and the at least one second friction disc are axially located on the side of the second side plate facing the first side plate, and the at least one second friction disc axially closest to the second side plate is axially abutting against the second side plate. In the torque limiter of this vibration damping device, the first side plate of the side plate assembly is directly anti-torsionally connected to the first friction disc, thereby reducing intermediate torque transmission components. The second side plate directly abuts against a second friction disc, allowing for axial positioning of each friction disc, and the second side plate itself can also form frictional contact with the second friction disc, thus constituting part of the friction plate assembly. In this design, the torque limiter of the vibration damping device is highly integrated, reducing the number of components and lowering production costs. The at least one first friction disc may include multiple first friction discs, and the at least one second friction disc may include multiple second friction discs, which are arranged alternately in the axial direction to form a friction plate assembly. This improves the torque transmission capacity of the torque limiter.

[0007] According to a preferred embodiment of the invention, the first side plate may have an axially extending axial section, and a torque limiter may be located radially between the axial section and the output hub. The at least one first friction disc may be torsionally connected to the axial section. The axial section may provide space for the first side plate to be torsionally connected to the first friction disc, particularly a plurality of axially arranged first friction discs.

[0008] According to another preferred embodiment of the invention, the first side plate may further include a radially extending radial segment, and an axial segment may extend from the edge of the radial side of the radial segment toward the second side plate. A damping spring abuts between the radial segment and the damping flange. The at least one first friction disc and the radial segment are located radially opposite to each other on the axial segment. Therefore, the axial segment of the first side plate for connection with the first friction disc is formed in the axial space between the two side plates. Preferably, the at least one first friction disc and the at least one second friction disc may not extend axially to the outer sides of the radial segment and the second side plate. Therefore, each friction disc can also be disposed in the space between the two side plates without increasing the axial dimension of the damping device. In this case, preferably, the output hub can be located radially inner to the axial segment, and the damping spring can be located radially outer to the axial segment.

[0009] According to another preferred embodiment of the present invention, the at least one first friction disc can be axially movable and torsionally connected to the first side plate, and the at least one second friction disc can be axially movable and torsionally connected to the output hub. The vibration damping device may further include a first limiting structure at least axially fixedly connected to the first side plate or the output hub, and the at least one first friction disc and at least one second friction disc abutting each other are axially constrained between the first limiting structure and the second side plate. This axially movable torsionally connected method can be achieved, for example, by a spline. The first limiting structure can be, for example, a retaining ring. This connection method facilitates the assembly of the friction discs and makes it easy for the friction discs to be tightly abutted together under axial clamping force.

[0010] According to another preferred embodiment of the present invention, the vibration damping device may further include a second limiting structure at least axially fixedly connected to the output hub. The first limiting structure may be connected to the output hub, and the second side plate may be axially located between the first and second limiting structures. The second side plate is axially constrained between the axially closest of at least one second friction disc and the second limiting structure. Through the cooperation of the first and second limiting structures, axial positioning of each friction disc and the side plate assembly is simultaneously achieved.

[0011] According to another preferred embodiment of the invention, the vibration damping device may further include an elastic preload member, through which the first limiting structure axially abuts against at least one of a first friction disc and at least one of a second friction disc. The elastic preload member can provide axial clamping force to each friction disc, causing them to abut tightly together, thereby enabling the transmission of torque through friction.

[0012] According to another preferred embodiment of the present invention, the first limiting structure may be a retaining ring mounted on the output hub, and / or the second limiting structure may be a flange fixed on the output hub. Preferably, the flange is integrally formed with the output hub.

[0013] According to another preferred embodiment of the invention, the vibration damping device may further include a friction pad disposed between the second limiting structure and the second side plate. The second limiting structure may be fixedly connected to the output hub and may abut against the second side plate axially via the friction pad. This allows the second limiting structure to transmit torque through friction, similar to the second friction disc.

[0014] According to another preferred embodiment of the present invention, the vibration damping device may further include a friction pad disposed between the second limiting structure and the second side plate, the friction pad being torsionally connected to the output hub in a manner that allows relative movement in the axial direction, the second limiting structure being fixedly connected to the output hub, and the second side plate, the friction pad, and the second limiting structure being able to be pressed together in the axial direction. Attached Figure Description

[0015] The invention is further described below with reference to the accompanying drawings. In the drawings, the same reference numerals represent elements with the same function. Wherein:

[0016] Figure 1 A schematic diagram of a torque limiter for a vibration damping device according to the prior art is shown;

[0017] Figure 2 A schematic diagram of a vibration damping device according to an embodiment of the present invention is shown; and

[0018] Figure 3 A partially enlarged view of a vibration damping device according to an embodiment of the present invention is shown. Detailed Implementation

[0019] The following describes specific embodiments of the vibration damping device according to the present invention in conjunction with the accompanying drawings. The detailed description and drawings below are provided to exemplify the principles of the invention; however, the invention is not limited to the described preferred embodiments, and the scope of protection of the invention is defined by the claims.

[0020] According to embodiments of the present invention, a vibration damping device with a torque limiter is provided, particularly a disc damper. This vibration damping device can be applied in the drivetrain of a motor vehicle, typically positioned between the engine and transmission, to absorb and buffer vibrations and shocks from the torque originating from the engine.

[0021] Figure 2 A schematic diagram of a vibration damping device according to an embodiment of the present invention is shown. Figure 2 In the diagram, the vibration damping device is shown in a longitudinal section passing through the central axis. (See diagram for example.) Figure 2 As shown, the vibration damping device includes a side plate assembly, a vibration damping flange 3, a vibration damping spring 4, an output hub 5, and a torque limiter.

[0022] The damping flange 3 is a generally disc-shaped component that is torsionally connected to components such as the engine crankshaft or possibly the flywheel, for example, by means of rivets. When the engine outputs torque to the transmission through the damping device, the damping flange 3 can serve as the torque input end of the damping device, inputting the torque from the engine into the damping device.

[0023] The side panel assembly includes two side panels, namely a first side panel 1 and a second side panel 2. The two side panels are two generally disc-shaped components arranged coaxially. The first side panel 1 and the second side panel 2 are axially spaced apart and fixedly connected to each other. For example, the first side panel 1 and the second side panel 2 can be connected together by rivets or other components extending axially through the two side panels. Therefore, the first side panel 1 and the second side panel 2 can move synchronously as a whole.

[0024] The damping flange 3 is arranged coaxially with the side plate assembly and is capable of rotating relative to it about a common central axis. The damping flange 3 is axially mounted between the first side plate 1 and the second side plate 2. The damping device may have at least one, preferably multiple, damping springs 4 arranged circumferentially spaced. The damping springs 4 are, for example, helical springs. One or more spring windows are formed on the first side plate 1, the second side plate 2, and the damping flange 3, respectively. Each damping spring 4 is mounted in a set of axially aligned spring windows and abuts against the side plate assembly and the damping flange 3 in the direction of rotation, thereby transmitting torque between the side plate assembly and the damping flange 3 while absorbing torque vibrations through its own elastic deformation.

[0025] According to a preferred embodiment, the vibration damping device may further include one or more centrifugal pendulum masses 6 mounted on the second side plate 2. Preferably, these centrifugal pendulum masses 6 may be arranged circumferentially at intervals in a region near the radial outer edge of the second side plate 2, thereby being located radially outside the damping spring 4. Each centrifugal pendulum mass 6 may oscillate approximately circumferentially relative to the second side plate 2 along a pendulum track on the second side plate 2, thereby further absorbing torque vibrations.

[0026] The output hub 5 is a generally cylindrical component that is coaxially arranged with the side plate assembly and the damping flange 3, and is preferably located radially inside the side plate assembly and the damping flange 3. When the engine outputs torque to the transmission through the damper, the output hub 5 can act as the torque output end of the damping device to input the torque from the engine into the transmission.

[0027] The torque limiter is mounted radially between the first side plate 1 and the output hub 5. Figure 3 It shows Figure 2 The cross-section of the vibration damping device shows details at the torque limiter, with components such as the vibration damping flange 3 omitted for clarity. Figure 3As shown, the torque limiter includes at least one first friction disc 7 and at least one second friction disc 8. Both the first friction disc 7 and the second friction disc 8 are generally annular plates. The first friction disc 7 is torsionally connected to the first side plate 1, while the second friction disc 8 is torsionally connected to the output hub 5. The first friction disc 7 and the second friction disc 8 can abut against each other axially and generate friction on their contact surfaces when there is relative rotation or a tendency to relative rotation, thereby transmitting torque between the side plate assembly and the output hub 5 through friction. Since the magnitude of the friction force is finite and preset, the torque limiter can limit the maximum torque transmitted through friction. To increase the contact area and friction force, multiple first friction discs 7 and corresponding multiple second friction discs 8 can be provided, arranged axially such that the first friction discs 7 and the second friction discs 8 are alternately distributed axially. In this case, these friction discs form a friction plate assembly similar to a friction clutch.

[0028] like Figure 3 As shown, the first side plate 1 may have an axial section extending generally in the axial direction and a radial section extending generally in the radial direction. The axial section connects to the edge of the radial side of the radial section and extends towards the second side plate 2 from that edge. Therefore, viewed in a cross-section through the central axis, the first side plate 1 has a generally L-shaped profile. The axial section of the first side plate 1 is used for a torsional connection with the first friction disc 7. The respective friction discs of the torque limiter (and the output hub 5) are located radially opposite to the radial section of the first side plate 1 on the axial section. A damping spring 4 is mounted on the radial section of the first side plate 1. In this embodiment, since the output hub 5 is located radially inside the side plate assembly, each friction disc is located radially inside the axial section, while the radial section and the damping spring 4 are located radially outside the axial section. The axial section provides a joint portion for the first friction disc to connect with the side plate assembly.

[0029] To avoid increasing the axial space of the damping device, preferably, each friction disc does not extend axially beyond the radial section of the first side plate 1 and the area beyond the second side plate 2. That is, the axial range of the torque limiter is approximately between the two side plates, and in particular, it can approximately coincide with the axial range of the axial section of the first side plate 1.

[0030] like Figure 2As shown, the periphery of the radial side of the second side plate 2 extends radially beyond the axial section of the first side plate, thus having at least partial overlap with each friction disc in the radial direction. In this embodiment, since each friction disc is located radially inside the axial section, the radial inner edge of the second side plate 2 extends inward beyond the axial section. The friction disc closest to the second side plate 2 in the axially alternating arrangement is a second friction disc 8 that is torsionally connected to the output hub 5, and this second friction disc 8 can directly abut against the second side plate 2 in the axial direction. In this case, the second friction disc 8 located at the outermost end can not only rub against the first friction disc 7 on one side, but also against the second side plate 2 on the other side, thereby obtaining greater friction to transmit torque. In other words, the second side plate 2 performs the same function as the first friction disc 7. This allows for a reduction in the number of components in the torque limiter, and thus reduces production costs.

[0031] To facilitate the installation of the individual friction discs in the friction disc assembly and to facilitate the control of the clamping force between the friction discs, preferably, each of the first friction discs 7 can move axially relative to the first side plate 1, and each of the second friction discs 8 can move axially relative to the output hub 5. This axially movable torsional connection can be achieved, for example, by a spline. In this case, the friction discs are limited on one axial side by the second side plate 2, and on the other axial side near the radial section of the first side plate 1 by a first limiting structure. The first limiting structure is at least axially fixedly connected to the first side plate 1 or the output hub 5. Each friction disc is axially constrained between the first limiting structure and the second side plate 2. The first limiting structure is, for example, a retaining ring 9 installed in an annular groove on the axial section of the first side plate 1 or the output hub 5. An elastic preload 10 can be provided between the first limiting structure and the friction disc furthest from the second side plate 2 axially. The first limiting structure abuts against this friction disc axially via the elastic preload 10, thereby pressing all the first friction discs 7 and second friction discs 8 together with the second side plate 2 from both ends.

[0032] To constrain the axial relative position between the side plate assembly and the output hub 5, preferably, a second limiting structure can be provided on the output hub 5, the second limiting structure being at least axially fixedly connected to the output hub 5. Simultaneously, a first limiting structure is also connected to the output hub 5, and the second side plate 2 is axially located between the two limiting structures. The second side plate 2 is axially constrained between the second friction disc 8 closest to the second side plate 2 and the second limiting structure, and when the elastic preload 10 applies an axial clamping force, the two can abut together axially. Therefore, the axial position of each friction disc and side plate assembly relative to the output hub 5 is defined by the two limiting structures. Figure 3As shown, the second limiting structure is, for example, a flange 11 fixed to the output hub 5. Preferably, the flange 11 can be integrally formed with the output hub 5. However, in other embodiments, the second limiting structure can also be a retaining ring or other similar component.

[0033] When the second limiting structure is a component completely fixed relative to the output hub 5 (e.g., flange 11), preferably, a friction pad 12 can also be provided between the second limiting structure and the second side plate 2. The second limiting structure can abut against the second side plate 2 axially via the friction pad 12. Therefore, the second limiting structure can also transmit torque through friction. Alternatively, the friction pad 12 can also be torsionally connected to the output hub 5 via teeth / splines and can move axially relative to the output hub 5. In this configuration, a friction structure is not necessarily provided between the friction pad 12 and the second limiting structure. In this case, the second side plate 2 and the friction pad 12 are pressed against the second limiting structure under axial pressure, thereby generating friction between the second side plate 2 and the friction pad 12.

[0034] Since the second side plate 2 is typically made of metal, the first friction disc 7, which is torsionally connected to the side plate assembly, is also preferably made of metal, while the second friction disc 8, which is torsionally connected to the output hub 5, is preferably made of a friction material, such as various known fiber-reinforced composite materials. In this case, the friction disc furthest from the second side plate, which is directly compressed by the elastic preload 10, is preferably the first friction disc 7, made of metal, thus enabling it to withstand greater compressive forces. The friction pad 12 can also be made of the same material as the second friction disc 8.

[0035] In the vibration damping device according to the present invention, the first friction disc 7 is directly and torsionalally connected to the first side plate 1, while the second side plate 2 serves to both constrain the various friction discs and transmit torque through friction. Therefore, not only can the number of components used to mount the friction discs be reduced, but the number of friction discs themselves can also be reduced. This reduces the overall number of components in the vibration damping device and lowers production costs.

[0036] While possible embodiments have been described exemplarily in the foregoing description, it should be understood that numerous variations of embodiments exist through combinations of all known and readily conceived technical features and implementation methods. Furthermore, it should be understood that the exemplary embodiments are merely examples and do not in any way limit the scope, application, or construction of the invention. The foregoing description is more intended to provide those skilled in the art with technical guidance for transforming at least one exemplary embodiment, wherein various changes, particularly regarding the function and structure of the components, can be made without departing from the scope of the claims.

[0037] Appendix Label Table

[0038] 1 First side plate

[0039] 2 Second side plate

[0040] 3 Vibration damping flange

[0041] 4. Vibration damping springs

[0042] 5 Output Hub

[0043] 6 Centrifugal pendulum mass component

[0044] 7 First friction disc

[0045] 8 Second friction disc

[0046] 9 retaining rings

[0047] 10. Elastic preload

[0048] 11 Flange

[0049] 12 Friction Pads

Claims

1. A vibration damping device, comprising: a side plate assembly comprising a first side plate (1) and a second side plate (2) fixedly connected coaxially and spaced apart in the axial direction; a damping flange (3) arranged coaxially and rotatably relative to the side plate assembly and axially between the first side plate (1) and the second side plate (2); a damping spring (4) abutting in the rotational direction between the damping flange (3) and the side plate assembly; an output hub (5) arranged coaxially and rotatably relative to the damping flange (3); and a torque limiter comprising at least one first friction disc (7) torsionally connected to the side plate assembly and at least one second friction disc (8) torsionally connected to the output hub (5), the first friction disc (7) and the second friction disc (8) being axially abuttable against each other to transmit torque by friction; characterized in that the at least one first friction disc (7) and the at least one second friction disc (8) are axially located on a side of the second side plate (2) facing the first side plate (1), and the second side plate (2) is abuttable against the second friction disc (8) on at least one axial side of a radially inner end thereof. the first side plate (1) has an axially extending axial section, the torque limiter is located radially between the axial section and the output hub (5), and the at least one first friction disc (7) is torsionally connected to the axial section.

2. The vibration damping device according to claim 1, characterized by the first side plate (1) further comprises a radially extending radial section, the axial section extends from an edge of a radial side of the radial section towards the second side plate (2), the damping spring (4) abuts between the radial section and the damping flange (3), and the at least one first friction disc (7) is located radially on opposite sides of the axial section with respect to the radial section.

3. The vibration damping device according to claim 2, characterized by the at least one first friction disc (7) and the at least one second friction disc (8) do not axially extend beyond the radial section and the second side plate (2) radially outward.

4. The vibration damping device according to claim 3, characterized by the at least one first friction disc (7) is axially movably torsionally connected to the first side plate (1), the at least one second friction disc (8) is axially movably torsionally connected to the output hub (5), the vibration damping device further comprises a first stop structure axially fixedly connected to the first side plate (1) or the output hub (5), and the at least one first friction disc (7) and the at least one second friction disc (8) abutting against each other are axially constrained between the first stop structure and the second side plate (2).

5. The vibration damping device according to any one of claims 1 to 4, characterized by the vibration damping device further comprises a second stop structure axially fixedly connected to the output hub (5), the first stop structure is connected to the output hub (5), the second side plate (2) is axially located between the first stop structure and the second stop structure, and the second side plate (2) is axially constrained between one of the at least one second friction disc (8) and the second stop structure.

6. The vibration damping device according to claim 5, characterized by ​ 7. The vibration damping device according to claim 6, characterized by The damping device further comprises a friction pad (12) arranged between the second limiting structure and the second side plate (2), the second limiting structure being fixedly connected with the output hub (5) and being capable of abutting against the second side plate (2) in the axial direction through the friction pad (12).

8. The vibration damping device according to claim 6, characterized by The damping device further comprises a friction pad (12) arranged between the second limiting structure and the second side plate (2), the friction pad (12) being torsionally connected with the output hub (5) in a manner capable of relative movement in the axial direction, the second limiting structure being fixedly connected with the output hub (5), and the second side plate (2), the friction pad (12) and the second limiting structure being capable of being pressed together in the axial direction.

9. The vibration damping device according to any one of claims 6 to 8, characterized by The damping device further comprises an elastic pre-tightening member (10), the first limiting structure abutting against one of the at least one first friction disc (7) and the at least one second friction disc (8) in the axial direction through the elastic pre-tightening member (10).

10. The vibration damping device according to claim 9, characterized by The first limiting structure is a stop ring (9) mounted on the output hub (5), and / or the second limiting structure is a flange (11) fixed on the output hub (5).

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