Damping device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SCHAEFFLER TECHNOLOGIES AG & CO KG
- Filing Date
- 2020-12-01
- Publication Date
- 2026-06-26
Smart Images
Figure CN114576308B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of vehicle technology. Specifically, this invention relates to a vibration damping device with a torque limiter. 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 a first friction disc anti-torsionally connected to the side plate assembly and a 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 first side plate has an axially extending axial section, the torque limiter is radially located between the axial section and the output hub, and the first friction disc is anti-torsionally connected to the axial section. In the torque limiter of this vibration damping device, the first side plate in the side plate assembly is directly anti-torsionally connected to the first friction disc via the axial section, thereby reducing intermediate torque transmission components. In this design, the torque limiter of the vibration damping device is highly integrated, which reduces the number of components and lowers production costs.
[0007] According to a preferred embodiment of the invention, the first side plate may further include a radially extending radial segment, and an axial segment extending from the edge of one radial side of the radial segment toward the second side plate. A damping spring abuts between the radial segment and the damping flange. The first friction disc and the radial segment are located radially on opposite sides of 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 first and second friction discs may not extend axially to the outside 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.
[0008] According to another preferred embodiment of the present invention, the first friction disc can be torsionally connected to the first side plate with axial relative movement, and the second friction disc can be torsionally connected to the output hub with axial relative movement. The vibration damping device may further include a first limiting structure and a second limiting structure, which can be at least axially fixedly connected to the axial section or the output hub. The first and second friction discs, which abut against each other, can be axially constrained between the first and second limiting structures. This torsionally connected method with axial relative movement can be achieved, for example, by a spline. This connection method facilitates the assembly of the various friction discs and makes it easier for the friction discs to abut together tightly under axial clamping force.
[0009] According to another preferred embodiment of the present invention, the second limiting structure may be axially closer to the second side plate than the first limiting structure and is at least axially fixedly connected to the output hub. The vibration damping device may further include a third limiting structure at least axially fixedly connected to the output hub. The second limiting structure may be axially located between the first limiting structure and the third limiting structure, and the second side plate may be axially constrained between the second limiting structure and the third limiting structure. Through the cooperation of the first limiting structure, the second limiting structure, and the third limiting structure, axial positioning of each friction disc and the side plate assembly is simultaneously achieved.
[0010] 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 the first friction disc or the 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.
[0011] According to another preferred embodiment of the present invention, the first limiting structure may be a first retaining ring mounted on the output hub, the second limiting structure may be a flange fixed on the output hub, and the third limiting structure may be a second retaining ring mounted on the output hub.
[0012] According to another preferred embodiment of the invention, the vibration damping device may include a plurality of first friction discs and a plurality of second friction discs, which may be arranged alternately in the axial direction to form a friction plate assembly. The axial section of the first side plate can provide space for anti-torsional connection with the plurality of axially arranged first friction discs. This improves the torque transmission capacity of the torque limiter.
[0013] According to another preferred embodiment of the present invention, the output hub may be located radially inside the axial section, and the damping spring may be located radially outside the axial section.
[0014] According to another preferred embodiment of the invention, the vibration damping device may further include a centrifugal pendulum mass, which may be oscillatingly mounted on the second side plate radially outward of the damping spring. The centrifugal pendulum mass can further buffer torque vibrations through its own oscillating motion relative to the second side plate. 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 4, a vibration damping spring 7, an output hub 15, and a torque limiter.
[0022] The damping flange 4 is a generally disc-shaped component that is torsionally connected to components such as the engine crankshaft or possibly the flywheel via bolts 5. When the engine outputs torque to the transmission through the damping device, the damping flange 4 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 4 is arranged coaxially with the side plate assembly and is capable of rotating relative to it about a common longitudinal central axis. The damping flange 4 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 7 arranged circumferentially spaced. The damping springs 7 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 4, respectively. Each damping spring 7 is mounted in a set of axially aligned spring windows and abuts against the side plate assembly and the damping flange 4 in the direction of rotation, thereby transmitting torque between the side plate assembly and the damping flange 4 while absorbing torque vibrations through its own elastic deformation.
[0025] According to a preferred embodiment, the vibration damping device may further include a centrifugal pendulum flange 3 and one or more centrifugal pendulum mass members 6. The centrifugal pendulum flange 3 may be an arc-shaped or annular component, fixedly connected to the second side plate 2 and spaced axially. Preferably, the centrifugal pendulum flange 3 may be located on opposite sides of the second side plate 2 in the axial direction to the damping flange 4. Preferably, these centrifugal pendulum mass members 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 7. Each centrifugal pendulum mass member 6 may swing approximately circumferentially relative to the second side plate 2 along a pendulum track on the second side plate 2 and the centrifugal pendulum flange 3, thereby further absorbing torque vibrations.
[0026] The output hub 15 is a generally cylindrical component that is coaxially arranged with the side plate assembly and the damping flange 4, and is preferably located radially inside the side plate assembly and the damping flange 4. When the engine outputs torque to the transmission through the damping device, the output hub 15 can serve 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 15. Figure 3 It shows Figure 2 Details of the cross-section of the vibration damping device at the torque limiter. (See image for example.) Figure 3As shown, the torque limiter includes at least one first friction disc 11 and at least one second friction disc 12. Both the first friction disc 11 and the second friction disc 12 are generally annular plates. The first friction disc 11 is torsionally connected to the first side plate 1, while the second friction disc 12 is torsionally connected to the output hub 15. The first friction disc 11 and the second friction disc 12 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 15 through friction. Since the magnitude of the friction is finite, the torque limiter can limit the maximum torque transmitted through friction. To increase the contact area and friction, multiple first friction discs 11 and corresponding multiple second friction discs 12 can be provided, arranged axially such that the first friction discs 11 and the second friction discs 12 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 from that edge toward the second side plate 2. 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 discs 11. The respective friction discs of the torque limiter (and the output hub 15) are located radially opposite to the radial section of the first side plate 1 on the axial side. A damping spring 7 is mounted on the radial section of the first side plate 1. In this embodiment, since the output hub 15 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 7 are located radially outside the axial section. The axial section provides a joint portion for these first friction discs 11 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] To facilitate the installation of the friction discs in the friction plate assembly and to facilitate the control of the clamping force between the friction discs, preferably, each first friction disc 11 is axially movable relative to the first side plate 1, and each second friction disc 12 is axially movable relative to the output hub 15. This axially movable torsional connection can be achieved, for example, via a spline. In this case, each friction disc requires a limiting structure on both axial sides for constraint. Therefore, the vibration damping device may include a first limiting structure and a second limiting structure arranged axially at intervals. These two limiting structures are at least axially fixedly connected to the first side plate 1 or the output hub 15. Each friction disc is axially constrained between the first limiting structure and the second limiting structure. The second limiting structure is axially closer to the second side plate 2 than the first limiting structure. The first limiting structure is, for example, a first retaining ring 14 installed in an annular groove on the axial section of the first side plate 1 or the output hub 15, and the second limiting structure is, for example, a flange 18 fixed to the axial section of the first side plate 1 or the output hub 15. Preferably, the flange 18 can be integrally formed with the output hub 15. An elastic preload 13 can be provided between the first limiting structure and a friction disc that is axially furthest from the second side plate 2. The first limiting structure abuts against this friction disc axially via the elastic preload 13, thereby pressing all the first friction discs 11 and the second friction discs 12 together from both ends together with the second limiting structure.
[0031] like Figure 2 As shown, the periphery of the radial side of the second side plate 2 extends radially beyond the axial section of the first side plate 1, thereby having at least a 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 radially inner edge of the second side plate 2 extends inward beyond the axial section.
[0032] To constrain the axial relative position between the side plate assembly and the output hub 15, preferably, a third limiting structure can be provided on the output hub 15, the third limiting structure being at least axially fixedly connected to the output hub 15. Simultaneously, a second limiting structure is also connected to the output hub 15, and the second side plate 2 is axially constrained between the second and third limiting structures. Therefore, the axial position of the side plate assembly relative to the output hub 15 is defined by the second and third limiting structures. Figure 3 As shown, the third limiting structure is, for example, a second retaining ring 17 installed in an annular groove on the output hub 15. However, in other embodiments, the third limiting structure may also be a flange or other similar component. Furthermore, preferably, an annular friction bushing 16 may be provided between the flange 18 and the second side plate 2, and between the second retaining ring 17 and the second side plate 2, respectively, to prevent wear between the two and to provide corresponding frictional damping when they rotate relative to each other.
[0033] like Figure 3 As shown, in the axially alternating arrangement of friction discs, the one closest to the second side plate 2 and the one furthest from the second side plate 2 can both be second friction discs 12 that are torsionally connected to the output hub 15. These two second friction discs 12 can directly abut against the flange 18 and the elastic preload 13, respectively, along the axial direction. Since the flange 18, which is integral with the output hub 15, is usually made of metal, the second friction disc 12 that is torsionally connected to the output hub 15 is also preferably made of metal, while the first friction disc 11 that is torsionally connected to the first side plate 1 is preferably made of friction material, such as various known polymer composite materials. In this case, the friction disc furthest from the second side plate 2 that is directly compressed by the elastic preload 13 is also preferably the second friction disc 12 made of metal, thereby being able to withstand greater compressive force.
[0034] In the vibration damping device according to the invention, the first friction disc 11 is directly and torsionalally connected to the first side plate 1, thus reducing the number of components used for the torque limiter. Simultaneously, multiple friction discs can be axially located in the space between the two side plates, thus not increasing the axial dimension of the vibration damping device.
[0035] 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.
[0036] Appendix Label Table
[0037] 1 First side plate
[0038] 2 Second side plate
[0039] 3 Centrifugal swing flange
[0040] 4 Vibration damping flange
[0041] 5 bolts
[0042] 6 Centrifugal pendulum mass component
[0043] 7. Vibration damping springs
[0044] 8 Friction Bushing
[0045] 9 Friction Bushing
[0046] 10 Diaphragm Springs
[0047] 11 First friction disc
[0048] 12 Second friction disc
[0049] 13. Elastic preload
[0050] 14 First retaining ring
[0051] 15 Output Hub
[0052] 16 Friction Bushing
[0053] 17 Second retaining ring
[0054] 18 Flanges
[0055] F Friction Plate Assembly
[0056] H output hub
[0057] O outer hub
Claims
1. A vibration damping device, comprising: A side panel assembly comprising a first side panel (1) and a second side panel (2) that are coaxially fixedly connected and spaced apart along the axial direction; A vibration damping flange (4) is arranged coaxially with the side plate assembly in a manner that allows it to rotate relative to the side plate assembly, and is located axially between the first side plate (1) and the second side plate (2). A damping spring (7) abuts against the damping flange (4) and the side plate assembly in the direction of rotation; Output hub (15), which is arranged coaxially with the vibration damping flange (4) and is rotatably relative to it; and A torque limiter includes a first friction disc (11) anti-torsionally connected to the side plate assembly and a second friction disc (12) anti-torsionally connected to the output hub (15), the first friction disc (11) and the second friction disc (12) being able to abut against each other axially to transmit torque through friction. Its features are, The first side plate (1) has an axially extending axial section, and the first friction disc (11) is torsionally connected to the axial section.
2. The vibration damping device according to claim 1, characterized in that, The first side plate (1) further includes a radially extending radial section, the axial section extending from the edge of the radial side of the radial section toward the second side plate (2), the damping spring (7) abutting between the radial section and the damping flange (4), and the first friction disc (11) and the radial section being located on opposite sides of the axial section in the radial direction.
3. The vibration damping device according to claim 2, characterized in that, The first friction disc (11) and the second friction disc (12) do not extend axially to the outside of the radial section and the second side plate (2).
4. The vibration damping device according to claim 1, characterized in that, The first friction disc (11) is axially movable relative to the first side plate (1) in a torsion-resistant connection, and the second friction disc (12) is axially movable relative to the output hub (15) in a torsion-resistant connection. The vibration damping device further includes a first limiting structure and a second limiting structure. The first limiting structure and the second limiting structure are at least axially fixedly connected to the axial section or the output hub (15). The first friction disc (11) and the second friction disc (12) abut against each other are axially constrained between the first limiting structure and the second limiting structure.
5. The vibration damping device according to claim 4, characterized in that, The second limiting structure is closer to the second side plate (2) in the axial direction than the first limiting structure and is at least axially fixedly connected to the output hub (15). The vibration damping device also includes a third limiting structure that is at least axially fixedly connected to the output hub (15). The second limiting structure is located in the axial direction between the first limiting structure and the third limiting structure. The second side plate (2) is constrained in the axial direction between the second limiting structure and the third limiting structure.
6. The vibration damping device according to claim 5, characterized in that, The vibration damping device further includes an elastic preload (13), and the first limiting structure abuts against the first friction disc (11) or the second friction disc (12) axially through the elastic preload (13).
7. The vibration damping device according to claim 6, characterized in that, The first limiting structure is a first retaining ring (14) mounted on the output hub (15), and / or the second limiting structure is a flange (18) fixed on the output hub (15), and / or the third limiting structure is a second retaining ring (17) mounted on the output hub (15).
8. The vibration damping device according to claim 4, characterized in that, The vibration damping device includes a plurality of first friction discs (11) and a plurality of second friction discs (12), which are arranged alternately in the axial direction to form a friction plate group.
9. The vibration damping device according to any one of claims 1 to 8, characterized in that, The output hub (15) is located radially inside the axial section, and the damping spring (7) is located radially outside the axial section.
10. The vibration damping device according to claim 9, characterized in that, The vibration damping device also includes a centrifugal pendulum mass component (6), which is oscillatingly mounted on the second side plate (2) on the radially outer side of the vibration damping spring (7).