Damper device

Abstract

The invention relates to a damping device. The damping device comprises a first rotating part, a second rotating part and an output hub which can rotate around a common rotating axis respectively, and the first rotating part and the second rotating part are in friction contact with each other to transmit limited torque through friction force. The output hub is used for being connected with a second rotating component in an anti-torque mode to serve as the input end or the output end of the damping device to transmit torque. And in the assembly state, the output hub and the second rotating component are in torsion-resistant connection through the key teeth, and the key teeth allow the output hub to axially move relative to the second rotating component so as to assemble or separate the output hub and the second rotating component. The damping device is provided with the torque limiter which is convenient to mount and dismount.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology. In particular, the present invention relates to a vibration damping device for a transmission system of a motor vehicle. Background Art

[0002] A vibration damping device is provided in the transmission system of a motor vehicle, which is usually arranged between the engine and the transmission to absorb and buffer torque vibrations. In order to avoid excessive torque from damaging components in the transmission, a torque limiter is sometimes provided in the vibration damping device to limit the maximum torque that can be transmitted through the vibration damping device. The torque limiter usually uses friction to provide a torque transmission function with an upper limit. One of the friction pairs of the torque limiter is sometimes provided on the output hub, and the output hub is provided with through holes distributed along the circumference. When the flywheel of the vibration damping device is fixed to the engine crankshaft or removed from the engine crankshaft, the bolts or rivets connecting the two can pass through the output hub through these through holes. However, when the input torque of the vibration damping device exceeds the limit, the friction pair of the torque limiter will slip, resulting in the misalignment of the through holes on the output hub and the bolts or rivets on the flywheel, thereby hindering disassembly. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to provide a vibration reduction device with a torque limiter that is easy to install and disassemble.

[0004] The above technical problems are solved by a vibration reduction device according to the present invention. The vibration reduction device includes a first rotating component, a second rotating component and an output hub which can rotate around a common rotation axis respectively. The first rotating component and the second rotating component are in frictional contact with each other to transmit limited torque through friction force. The output hub is used to be torsionally connected with the second rotating component to transmit torque as the input end or output end of the vibration reduction device. In the assembled state, the output hub and the second rotating component are torsionally connected by key teeth, and the key teeth allow the output hub and the second rotating component to be assembled or separated by axial movement of the output hub relative to the second rotating component. The first rotating component and the second rotating component in frictional contact constitute a torque limiter of the vibration reduction device. As a provider of a friction surface in the friction pair of the torque limiter, the second rotating component and the output hub are torsionally connected by key teeth, which facilitates the assembly and separation of the second rotating component and the output hub, so that the torque limiter can also be disassembled more conveniently.

[0005] According to a preferred embodiment of the present invention, the second rotating component may include a stopper, and the vibration reduction device may further include an elastic pressing member. In the assembled state, the elastic pressing member applies an elastic force toward the stopper to the output hub, so that the output hub is axially constrained between the stopper and the elastic pressing member. The stopper of the second rotating component and the elastic pressing member jointly define the axial position of the output hub in the assembled state, and the elastic pressing member facilitates the disassembly and assembly of the output hub.

[0006] According to another preferred embodiment of the present invention, the vibration reduction device may further include a flywheel capable of rotating around a rotation axis and one or more vibration reduction springs distributed circumferentially around the rotation axis, the flywheel and the first rotating component can transmit torque to each other through the vibration reduction springs, the first rotating component, the second rotating component and the output hub are axially located on the same side of the flywheel, and the stopper is axially located between the flywheel and the elastic clamping member. The elastic clamping member is thus located on a side away from the flywheel relative to the stopper, which facilitates installation and removal of the output hub.

[0007] According to another preferred embodiment of the present invention, the second rotating component includes a first clamping plate and a second clamping plate fixedly connected to each other, the first rotating component is axially pressed between the first clamping plate and the second clamping plate, the first clamping plate is axially closer to the flywheel than the second clamping plate, the stopper is provided by the first clamping plate, the second clamping plate is axially located between the elastic clamping member and the first clamping plate, and in the assembled state, the output hub and the second clamping plate are torsionally connected via key teeth. Thus, the two clamping plates of the second rotating component can respectively provide the functions of constraining the output hub and torsionally connecting with the output hub.

[0008] According to another preferred embodiment of the present invention, the vibration reduction device may further include a support plate fixed on the second rotating component, the support plate is axially located on a side of the second clamping plate away from the first clamping plate, and the elastic clamping member elastically abuts between the support plate and the output hub. The support plate fixed on the second rotating component provides an axial support point for the elastic clamping member.

[0009] According to another preferred embodiment of the present invention, the elastic clamping piece can be fixed to a side of the second clamping plate away from the first clamping plate and include an elastic foot extending toward the first clamping plate, and in the assembled state, the output hub is clamped between the elastic foot and the stopper. Since the elastic clamping piece is directly fixed to the second clamping plate, there is no need to provide an axial support point through an additional component.

[0010] According to another preferred embodiment of the present invention, the vibration reduction device may further include a pressure plate and an elastic diaphragm, wherein the pressure plate is axially located between the second clamping plate and the first rotating component, and the elastic diaphragm elastically abuts between the second clamping plate and the pressure plate, so that the first rotating component is clamped between the pressure plate and the first clamping plate. Since the axial support point of the elastic diaphragm is provided by the second clamping plate, it is not necessary to establish axial contact between the second rotating component and the flywheel or the cover plate of the flywheel.

[0011] According to another preferred embodiment of the present invention, the vibration reduction device may further include a cover plate and two friction washers, the cover plate is fixed to the side of the flywheel facing the first rotating component, the first rotating component is axially located between the cover plate and the flywheel, and the two friction washers are axially abutted between the flywheel and the first rotating component and between the cover plate and the first rotating component. The friction washers define the axial position of the first rotating component relative to the flywheel and the cover plate. The friction washers have no contact with the second rotating component and will not affect the heat dissipation of the friction pair of the torque limiter.

[0012] According to another preferred embodiment of the present invention, the output hub can be located radially inside the second rotating component, and the cover plate and the two friction washers can be located radially outside the second rotating component. The output hub is thus located radially closest to the axial center, and this design facilitates the layout of the vibration damping device and can provide a larger torque transmission capacity.

[0013] According to another preferred embodiment of the present invention, the output hub may include one or more through holes extending axially therethrough, and the through holes are used to allow a fixing member for fixing the vibration damping device to pass through the output hub. Such a fixing member may be, for example, a bolt or a rivet used to fix the flywheel to the engine crankshaft. The torque limiter and the output hub are easy to install and remove, which helps to adjust the torque limiter and the output hub when the through hole slips due to torque overload and is not aligned with the fixing member. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described below in conjunction with the accompanying drawings. The same reference numerals in the drawings represent elements with the same functions.

[0015] Figure 1a and Figure 1b A cross-sectional view showing a vibration damping device according to an exemplary embodiment of the present invention;

[0016] Figure 2 Show Figure 1a and Figure 1b A front view of the vibration reduction device shown;

[0017] Figure 3 Show Figure 1a and Figure 1b A schematic diagram of a torque limiter of a vibration reduction device is shown;

[0018] Figures 4a to 4e Show Figure 1a and Figure 1b A schematic diagram of components of the vibration reduction device shown;

[0019] Figure 5 A cross-sectional view showing a vibration damping device according to another exemplary embodiment of the present invention;

[0020] Figure 6 Show Figure 5A front view of the vibration reduction device shown;

[0021] Figure 7 Show Figure 5 A schematic diagram of a torque limiter of a vibration damping device shown; and

[0022] Figure 8 Show Figure 5 Schematic diagram of the elastic pressure piece of the vibration damping device shown. DETAILED DESCRIPTION

[0023] The following detailed description and drawings are used to illustrate the principle of the present invention. The present invention is not limited to the preferred embodiments described. The protection scope of the present invention is defined by the claims.

[0024] According to an embodiment of the present invention, a vibration damping device for a powertrain of a motor vehicle is provided. Such a vibration damping device is usually arranged between an engine and a transmission in the powertrain, so as to transmit torque between the two and absorb and buffer torque vibration.

[0025] Figures 1a to 4e An exemplary embodiment of a vibration reduction device according to the present invention is shown. Figure 1a , Figure 1b and Figure 2 As shown, the vibration damping device includes a plurality of rotating parts that can rotate around a common rotation axis respectively, and these rotating parts can transmit torque to each other along a predetermined transmission path. The vibration damping device is generally disc-shaped, and the common rotation axis of these rotating parts is the central axis of the vibration damping device. The vibration damping device includes a torque limiter, which is composed of two rotating parts in friction contact among the rotating parts. The two rotating parts constituting the torque limiter can be respectively referred to as a first rotating part and a second rotating part.

[0026] In this embodiment, in addition to the two rotating parts constituting the torque limiter, the multiple rotating parts of the vibration damping device also include a flywheel 1 and an output hub 2, and the torque limiter is connected between the flywheel 1 and the output hub 2 on the torque transmission path. The flywheel 1 and the output hub 2 are respectively connected to the external transmission parts as the relative input end and output end of the vibration damping device to input torque to the vibration damping device or output torque from the vibration damping device. For example, the flywheel 1 can usually be connected to the engine crankshaft (not shown) in a torsion-proof manner (for example, by bolts or rivets and other fixings), and the output hub 2 can usually be connected to the transmission input shaft (not shown) in a torsion-proof manner (for example, by splines, etc.). The flywheel 1 is a roughly disc-shaped component, and its central axis is arranged to substantially coincide with the common rotation axis of each rotating component. The flywheel 1 has a large moment of inertia, so that torque vibration can be buffered by its own rotational inertia. Other rotating parts in the vibration damping device (including the output hub 2 and the rotating parts constituting the torque limiter, etc.) are located on the same side of the flywheel 1 in the axial direction.

[0027] In this embodiment, the first rotating component is a flange 3 having a substantially annular plate structure, which has a central axis substantially coinciding with the rotation axis and extends substantially in a plane perpendicular to the central axis. The vibration reduction device further includes one or more vibration reduction springs 4 distributed circumferentially around the rotation axis (preferably evenly spaced). Each vibration reduction spring 4 abuts between the flywheel 1 and the flange 3 in the relative rotation direction, so that torque can be transmitted between the two and torque vibration can be buffered and absorbed by its own elastic deformation. The vibration reduction spring 4 can be, for example, a coil spring or a spring of other forms.

[0028] In order to hold the damping spring 4, the damping device may also preferably include a cover plate 5. The cover plate 5 is a roughly annular plate having a central axis substantially coinciding with the rotation axis and extending roughly in a plane perpendicular to the central axis. The cover plate 5 is fixed to the side of the flywheel 1 facing the flange 3 and is axially spaced apart from the flywheel 1. The connection between the cover plate 5 and the flywheel 1 can be achieved, for example, by a fixing member such as a rivet or bolt extending axially therebetween. The cover plate 5 and the flywheel 1 can jointly form a spring window for holding the damping spring 4. The flange 3 is axially located between the cover plate 5 and the flywheel 1.

[0029] like Figure 1a As shown, preferably, the vibration reduction device may further include two friction washers 12. The two friction washers 12 are respectively axially abutted between the flywheel 1 and the flange 3 and between the cover plate 5 and the flange 3, thereby limiting the axial position of the flange 3 relative to the flywheel 1 and the cover plate 5. Preferably, the output hub 2 is located radially inside the second rotating component, and the cover plate 5 and the two friction washers 12 are located radially outside the second rotating component. The friction washers 12 have no contact with the second rotating component and will not affect the heat dissipation of the friction pair of the torque limiter. In addition, as Figure 1bAs shown, the vibration damping device may further include an additional friction control plate 13 , and the friction washer 12 between the cover plate 5 and the flange 3 may abut against the cover plate 5 or the flange 3 via the friction control plate 13 .

[0030] The flange 3 as the first rotating component and the second rotating component are in frictional contact with each other to transmit limited torque by friction, thereby forming a torque limiter. The output hub 2 is torsionally connected to the second rotating component to transmit torque as the input end or output end of the vibration reduction device. In the assembled state, the output hub 2 and the second rotating component are torsionally connected by key teeth. The key teeth allow the output hub 2 to be assembled or separated from the second rotating component by axial movement of the output hub 2 relative to the second rotating component.

[0031] In order to limit the axial position of the second rotating component relative to the output hub 2 in the assembled state and prevent the two from separating, preferably, the vibration reduction device may also include an elastic pressing member 8, and the second rotating component includes a corresponding stop portion. In the assembled state, the elastic pressing member 8 applies an elastic force toward the stop portion to the output hub 2, so that the output hub 2 is axially constrained between the stop portion of the second rotating component and the elastic pressing member 8. When the torque limiter needs to be disassembled, the elastic pressing member 8 can be removed first, and then the output hub 2 can be easily separated from the second rotating component. In order to facilitate disassembly, the stop portion of the second rotating component is preferably located axially between the elastic pressing member 8 and the flywheel 1, so that the elastic pressing member 8 is axially located on the side of the stop portion away from the flywheel 1.

[0032] Figure 3 FIG. 2 is a schematic diagram showing a torque limiter of a vibration damping device according to this embodiment. Figure 3 As shown, in order to provide stable friction contact, in this embodiment, the second rotating component is composed of multiple components fixedly connected together. Specifically, the second rotating component may include a first clamping plate 6 and a second clamping plate 7 fixed together. Figure 4a and Figure 4bAs shown, the first clamping plate 6 and the second clamping plate 7 are respectively substantially annular plates and have a central axis substantially coinciding with the rotation axis. The first clamping plate 6 is axially closer to the flywheel 1 than the second clamping plate 7. The first clamping plate 6 and the second clamping plate 7 are both located radially inside the cover plate 5. The radial inner regions of the first clamping plate 6 and the second clamping plate 7 abut against each other in the axial direction and are fixedly connected together (for example, by fixing members such as bolts or rivets), and the radial inner regions are offset away from each other in the axial direction, thereby being spaced apart by a certain axial distance. This forms an annular gap open to the radial outside between the first clamping plate 6 and the second clamping plate 7. The radial inner region of the flange 3 radially crosses the cover plate 5 and extends into the annular gap between the first clamping plate 6 and the second clamping plate 7. Through certain pre-tightening measures, the flange 3 is axially pressed between the first clamping plate 6 and the second clamping plate 7, thereby forming a friction fit relationship with the second rotating component. As a result, torque can be transmitted between the flange and the second rotating component through friction. For example, the vibration damping device may also include an annular pressure plate 10 and an elastic diaphragm 11, wherein the pressure plate 10 is axially located between the second clamping plate 7 and the flange 3, and the elastic diaphragm 11 elastically abuts between the second clamping plate 7 and the pressure plate 10, so that the flange 3 is clamped between the pressure plate 10 and the first clamping plate 6.

[0033] Preferably, the stopper can be provided by the first clamping plate 6. In particular, the radially inner region of the first clamping plate 6 can be used as a stopper to abut the radially outer region of the output hub 2 in the axial direction. At the same time, the key teeth of the second rotating component can be provided by the second clamping plate 7. Figure 4b As shown, the second clamping plate 7 is formed with one or more key teeth 7a distributed along the circumferential direction on the radial inner periphery; Figure 4e As shown, the output hub 2 is formed with one or more key teeth 2a distributed circumferentially on the radial outer periphery. In the assembled state, the key teeth 7a of the second clamping plate 7 and the key teeth 2a of the output hub 2 are mutually engaged in a complementary manner, so that the output hub 2 and the second clamping plate 7 are connected torsionally through these key teeth.

[0034] In this case, the elastic pressing member 8 can be installed on the side of the second clamping plate 7 away from the first clamping plate 6, so that the second clamping plate 7 is axially located between the elastic pressing member 8 and the first clamping plate 6. The elastic pressing member 8 can be installed in a variety of ways. Figures 1a to 4e The embodiment of FIG. 1 shows a specific installation method of the elastic pressing member 8. Specifically, the vibration reduction device may further include a support plate 9 fixed on the second rotating member. Figure 3 As shown, the support plate 9 is located on the side of the second clamping plate 7 away from the first clamping plate 6 in the axial direction, and the elastic pressing member 8 elastically abuts between the support plate 9 and the output hub 2. Figure 4cAs shown, the support plate 9 is a roughly annular plate and has a central axis that substantially coincides with the axis of rotation. The support plate 9 has one or more connecting pieces 9a extending radially inward. Each connecting piece 9a is offset axially in a direction close to the second clamping plate 7 relative to the annular portion of the support plate 9. The connecting piece 9a abuts against the second clamping plate 7 axially and is fixedly connected to the second clamping plate 7. The connecting piece 9a and the second clamping plate 7 can be connected to each other, for example, by fasteners such as bolts or rivets. Preferably, the fastener can simultaneously pass through the axially aligned through holes on the first clamping plate 6, the second clamping plate 7 and the connecting piece 9a, thereby fixing the three components together. An axial gap is formed between the annular portion of the support plate 9 and the second clamping plate 7 and the output hub 2, and the elastic clamping piece 8 can be installed in the gap and abut between the annular portion of the support plate 9 and the output hub 2 in an elastically compressed manner. For example, as Figure 4d As shown, the elastic pressing member 8 may include an annular ring body 8a and one or more elastic legs 8b extending obliquely from the ring body 8a toward the radial inner side. The ring body 8a extends roughly in a plane perpendicular to the central axis. The ring body 8a is used to abut the annular portion of the support plate 9, and the elastic legs 8b are used to abut the output hub 2.

[0035] Figures 5 to 8 Another exemplary embodiment of the vibration damping device according to the present invention is shown. Figures 1a to 4e The difference between the vibration reduction devices is the installation method of the elastic pressing member 8. Figures 5 to 7 As shown, the vibration damping device does not include the support plate 9. Alternatively, the elastic pressing member 8 is directly fixed to the side of the second clamping plate 7 away from the first clamping plate 6. Figure 8 As shown, the elastic clamping member 8 also includes an annular ring body 8a and one or more elastic legs 8b extending obliquely from the ring body 8a toward the radial inner side, but the ring body 8a is formed into a wavy structure with protrusion sections and recessed sections arranged alternately in the circumferential direction. The recessed section of the ring body 8a is used to abut and fix the second clamping plate 7, while the protrusion section is axially away from the second clamping plate 7. Each elastic leg 8b extends from the corresponding protrusion section toward the first clamping plate 6. In the assembled state, the output hub 2 is clamped between the elastic legs 8b and the stopper of the first clamping plate 6. Similarly, the ring body 8a can be connected to the second clamping plate 7 by, for example, bolts or rivets. Preferably, the fixing member can simultaneously pass through the axially aligned through holes on the first clamping plate 6, the second clamping plate 7 and the ring body 8a, thereby fixing the three components together.

[0036] In various embodiments according to the present invention, the output hub 2 may include one or more through holes 2b extending axially therethrough, and the through holes 2b are used to allow a fixing member for fixing the vibration damping device to pass through the output hub 2. The fixing member is, for example, a bolt or a rivet. After the fixing member passes through the output hub 2, the flywheel 1 can be fixedly connected to, for example, an engine crankshaft. When the through hole slips due to torque overload and is not aligned with the fixing member, the output hub 2 according to the present invention can be conveniently separated from the torque limiter by the key teeth, thereby facilitating the re-adjustment of the torque limiter.

[0037] According to the vibration damping device of the invention, the output hub and the torque limiter are connected torsionally by key teeth, which facilitates the installation and removal of the torque limiter. This is conducive to simplifying the installation and maintenance procedures of the vibration damping device. At the same time, the matching relationship between the torque limiter and other friction pads in the vibration damping device is simplified, and the heat dissipation effect of the friction surface is optimized.

[0038] Although possible embodiments are described by way of example in the above description, it should be understood that there are still a large number of variations of embodiments through the combination of all known and other technical features and embodiments that are easily conceivable to the skilled person. It should also be understood that the exemplary embodiment is only an example and that such an embodiment in no way limits the scope of protection, application and configuration of the present invention. The above description is more to provide the skilled person with a technical guide for converting at least one exemplary embodiment, wherein various changes can be made, especially changes in the functions and structures of the components, as long as they do not depart from the scope of protection of the claims.

[0039] Reference numerals list

[0040] 1 Flywheel

[0041] 2 Output hub

[0042] 2a Key teeth

[0043] 2b Through hole

[0044] 3 Flange

[0045] 4. Damping spring

[0046] 5 Cover

[0047] 6 First splint

[0048] 7 Second splint

[0049] 7a Key teeth

[0050] 8 Elastic clamp

[0051] 8a Circle

[0052] 8b Elastic feet

[0053] 9 Support plate

[0054] 9a Connecting piece

[0055] 10 Pressure plate

[0056] 11 Elastic diaphragm

[0057] 12 Friction washer

[0058] 13 Friction control plate

Claims

1. A vibration damping device, comprising a first rotating component, a second rotating component and an output hub (2) which can respectively rotate around a common rotation axis, wherein the first rotating component and the second rotating component are in frictional contact with each other to transmit a limited torque by friction, and the output hub (2) is used to be torsionally connected to the second rotating component to serve as an input end or an output end of the vibration damping device to transmit torque, It is characterized in that In the assembled state, the output hub (2) and the second rotating component are torsionally connected via key teeth, and the key teeth allow the output hub (2) to be assembled or separated from the second rotating component by axially moving the output hub (2) relative to the second rotating component.

2. The vibration reduction device according to claim 1, characterized in that: The second rotating component includes a stop portion, and the vibration reduction device also includes an elastic pressing member (8). In the assembled state, the elastic pressing member (8) applies an elastic force toward the stop portion to the output hub (2), so that the output hub (2) is axially constrained between the stop portion and the elastic pressing member (8).

3. The vibration reduction device according to claim 2, characterized in that: The vibration damping device further comprises a flywheel (1) capable of rotating about the rotation axis and one or more vibration damping springs (4) distributed circumferentially about the rotation axis; the flywheel (1) and the first rotating component can transmit torque to each other through the vibration damping springs (4); the first rotating component, the second rotating component and the output hub (2) are axially located on the same side of the flywheel (1); and the stopper is axially located between the flywheel (1) and the elastic pressing member (8).

4. The vibration reduction device according to claim 3, characterized in that: The second rotating component comprises a first clamping plate (6) and a second clamping plate (7) which are fixedly connected to each other. The first rotating component is axially pressed between the first clamping plate (6) and the second clamping plate (7). The first clamping plate (6) is axially closer to the flywheel (1) than the second clamping plate (7). The stopper is provided by the first clamping plate (6). The second clamping plate (7) is axially located between the elastic clamping member (8) and the first clamping plate (6). In the assembled state, the output hub (2) and the second clamping plate (7) are torsionally connected via the key teeth.

5. The vibration reduction device according to claim 4, characterized in that: The vibration reduction device also includes a support plate (9) fixed on the second rotating component, the support plate (9) is axially located on the side of the second clamping plate (7) away from the first clamping plate (6), and the elastic pressing member (8) elastically abuts between the support plate (9) and the output hub (2).

6. The vibration reduction device according to claim 4, characterized in that: The elastic pressing member (8) is fixed to a side of the second clamping plate (7) away from the first clamping plate (6) and comprises an elastic support foot (8b) extending toward the first clamping plate (6). In the assembled state, the output hub (2) is clamped between the elastic support foot (8b) and the stop portion.

7. The vibration reduction device according to claim 4, characterized in that: The vibration reduction device also includes a pressure plate (10) and an elastic diaphragm (11), wherein the pressure plate (10) is axially located between the second clamping plate (7) and the first rotating component, and the elastic diaphragm (11) elastically abuts between the second clamping plate (7) and the pressure plate (10), so that the first rotating component is clamped between the pressure plate (10) and the first clamping plate (6).

8. The vibration reduction device according to claim 4, characterized in that: The vibration reduction device further comprises a cover plate (5) and two friction washers (12); the cover plate (5) is fixed on a side of the flywheel (1) facing the first rotating component; the first rotating component is axially located between the cover plate (5) and the flywheel (1); and the two friction washers (12) are axially abutted between the flywheel (1) and the first rotating component and between the cover plate (5) and the first rotating component, respectively.

9. The vibration reduction device according to claim 8, characterized in that: The output hub (2) is located on the radial inner side of the second rotating component, and the cover plate (5) and the two friction washers (12) are located on the radial outer side of the second rotating component.

10. The vibration damping device according to any one of claims 1 to 9, characterized in that: The output hub (2) comprises one or more through holes (2b) extending axially therethrough, wherein the through holes (2b) are used to allow a fixing member for fixing the vibration damping device to pass through the output hub (2).

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