Damping device

Abstract

The invention provides a damper device which can operate smoothly. The flange plate has a first side surface, a second side surface, and an opening. The hub is provided with a main body part and an annular convex part. The annular convex portion extends on an outer peripheral surface of the main body portion in a circumferential direction. The annular projection is press-fitted into the opening of the flange plate. The hub is configured to rotate integrally with the flange plate. The intermediate member is disposed between the flange plate and the first plate in the axial direction. The intermediate member has a first inner wall surface and a second inner wall surface. The first inner wall surface and the first side surface face each other with a gap therebetween. The second inner wall surface and the outer peripheral surface of the annular protrusion face each other with a gap therebetween. The first inner wall surface, the second inner wall surface, the first side surface, and the outer peripheral surface of the annular protrusion define an annular housing space.

Description

Technical Field

[0001] The present invention relates to a damping device. Background Art

[0002] The damping device is configured to absorb and attenuate torque fluctuations from an internal combustion engine. For example, the damping device disclosed in Patent Document 1 includes a first plate, a second plate, a hub flange, and an elastic member. The elastic member elastically connects the first plate and the second plate to the hub flange.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2021-196013 Summary of the Invention

[0006] Technical Problem to be Solved by the Invention

[0007] It is desirable to form the hub flange with a component separate from the hub and the flange plate. In such a case where the hub flange is formed with a component separate from the hub and the flange plate, it may prevent the damping device from operating smoothly.

[0008] The technical problem of the present invention is to provide a damping device that can operate smoothly.

[0009] Technical Solution for Solving the Technical Problem

[0010] The damping device according to the first aspect includes a flange plate, a hub, a first plate, an elastic member, and an intermediate member. The flange plate has a first side surface, a second side surface, and an opening. The first side surface faces the first side in the axial direction. The second side surface faces the second side in the axial direction. The opening is formed at the center of the flange plate. The hub has a main body portion and an annular convex portion. The main body portion extends in the axial direction. The annular convex portion extends in the circumferential direction on the outer peripheral surface of the main body portion. The annular convex portion is press-fitted into the opening of the flange plate. The hub is configured to rotate integrally with the flange plate. The first plate is disposed at an interval from the flange plate. The first plate is disposed on the first side in the axial direction with respect to the flange plate. The elastic member elastically connects the flange plate and the first plate. The intermediate member is disposed between the flange plate and the first plate in the axial direction. The annular convex portion has a third side surface facing the first side in the axial direction. The third side surface is located on the first side in the axial direction with respect to the first side surface of the flange plate. The intermediate member has a first inner wall surface and a second inner wall surface. The first inner wall surface faces the first side surface at an interval. The second inner wall surface faces the outer peripheral surface of the annular convex portion at an interval. The first inner wall surface, the second inner wall surface, the first side surface, and the outer peripheral surface of the annular convex portion define an annular accommodation space.

[0011] When forming a hub flange with components separated by a hub and a flange plate, in order to make the hub and the flange plate rotate integrally, there is a method of press-fitting the hub into the flange plate to integrate the hub and the flange plate. If the hub flange plate is formed in this way, chips generated due to the hub being dug out sometimes adhere to the hub when the hub is press-fitted into the flange plate. If a part of the chips adhering to the hub detaches from the hub during the rotation of the damping device, it may enter between the components of the damping device, causing the damping device to malfunction smoothly.

[0012] In contrast, in the damping device according to the first aspect, the accommodation space is defined by the first inner wall surface, the second inner wall surface, the first side surface, and the outer peripheral surface of the annular protrusion. Therefore, even when the chips adhering to the hub detach from the hub, the chips are enclosed within the accommodation space. As a result, the damping device can operate smoothly.

[0013] The damping device according to the second aspect is configured as follows in the damping device according to the first aspect. The third side surface is arranged at an interval from the first inner wall surface in the axial direction.

[0014] The damping device according to the third aspect is configured as follows in the damping device according to the first or second aspect. The annular protrusion has chips accommodated within the accommodation space.

[0015] Advantages of the Invention

[0016] According to the present invention, the damping device can operate smoothly. Description of the Drawings

[0017] Figure 1 is the front view of the damping device.

[0018] Figure 2 is Figure 1 the cross-sectional view taken along the line II-II of

[0019] Figure 3 is the enlarged cross-sectional view of the damping device.

[0020] Figure 4 is the enlarged cross-sectional view showing the periphery of the accommodation space. Detailed Description of the Embodiment

[0021] Hereinafter, the damping device 100 according to the present embodiment will be described with reference to the drawings. In addition, in the following description, the axial direction is the direction in which the rotation axis O of the damping device 100 extends. Further, the circumferential direction is the circumferential direction of a circle centered on the rotation axis O, and the radial direction is the radial direction of a circle centered on the rotation axis O. In addition, the first side in the axial direction refers to Figure 2 the left side of Figure 2 and the second side in the axial direction refers to

[0022] Figure 1is the front view of the damping device, Figure 2 is Figure 1 the sectional view taken along the line II-II of Figure 1 and Figure 2 As shown in Figure 2 , the damping device 100 has a damper unit 11 and a torque limiter unit 12. The damper unit 11 and the torque limiter unit 12 rotate substantially integrally with each other. The damping device 100 is disposed between an internal combustion engine (not shown) and an output side component (not shown). Further, the output side component is, for example, an electric motor or a transmission. The damping device 100 is mounted on a flywheel (not shown). For example, in

[0023] [Damper Unit]

[0024] The damper unit 11 is mounted on the torque limiter unit 12. The damper unit 11 is configured to attenuate rotational fluctuations. The damper unit 11 has an output rotating member 2, an input rotating member 3, an elastic member 4, a first intermediate member 5 (an example of an intermediate member), a second intermediate member 6, and a friction disk 7.

[0025] <Output Rotating Member>

[0026] The output rotating member 2 is configured to transmit the torque from the input rotating member 3 to the output side component. The output rotating member 2 is configured to be rotatable about the rotation axis O.

[0027] The output rotating member 2 has a flange plate 21 and a hub 22. The flange plate 21 and the hub 22 are configured to rotate integrally.

[0028] Figure 3 is an enlarged sectional view of the damping device 100. As shown in Figure 3 , the flange plate 21 has a first side surface 211 and a second side surface 212. The first side surface 211 is the surface of the two side surfaces of the flange plate 21 that faces the first side in the axial direction. The second side surface 212 is the surface of the two side surfaces of the flange plate 21 that faces the second side in the axial direction.

[0029] The flange plate 21 has an opening 213 at the central portion. That is, the flange plate 21 is annular. Further, the flange plate 21 has a plurality of receiving holes 214. Each of the receiving holes 214 is arranged at intervals in the circumferential direction. Each of the receiving holes 214 is configured to receive the elastic member 4.

[0030] The hub 22 has a main body portion 221 and an annular convex portion 222. The main body portion 221 is cylindrical. The main body portion 221 extends along the axial direction. The main body portion 221 axially penetrates through the opening portions of the following-described first plate 31 and second plate 32. The main body portion 221 has a spline hole 224 extending along the axial direction. The input shaft of the output-side component can be spline-fitted with the spline hole 224.

[0031] The annular convex portion 222 is formed on the outer peripheral surface of the main body portion 221. The annular convex portion 222 extends along the circumferential direction. The dimension of the annular convex portion 222 in the axial direction is larger than the thickness of the flange plate 21. For example, the dimension L3 of the mounting portion on the annular convex portion 222 is about 1.5 to 3 times the thickness of the flange plate 21.

[0032] The annular convex portion 222 is press-fitted into the opening portion 213 of the flange plate 21. Therefore, the hub 22 rotates integrally with the flange plate 21. That is, the hub 22 does not rotate relative to the flange plate 21.

[0033] The annular convex portion 222 is press-fitted into the opening portion 213 of the flange plate 21 from the first side in the axial direction. In addition, the outer diameter of the annular convex portion 222 before press-fitting is slightly larger than the inner diameter of the opening portion 213 of the flange plate 21. Further, a plurality of teeth extending in the axial direction are formed on the inner peripheral surface of the opening portion 213 of the flange plate 21. Therefore, the annular convex portion 222 is cut by the flange plate 21, and chips 225 are generated from the annular convex portion 222. The chips 225 are in a state of adhering to the annular convex portion 222. The chips 225 are generated on the first side in the axial direction with respect to the flange plate 21. That is, the chips 225 face the first side surface 211 of the flange plate 21. In addition, the chips 225 face the outer peripheral surface of the annular convex portion 222.

[0034] The annular convex portion 222 has a restricting protrusion 226. The restricting protrusion 226 protrudes radially outward from the outer peripheral surface of the annular convex portion 222. The restricting protrusion 226 extends along the circumferential direction. The restricting protrusion 226 is disposed on the second side in the axial direction with respect to the flange plate 21. The movement of the flange plate 21 toward the second side in the axial direction is restricted by the restricting protrusion 226. The restricting protrusion 226 is formed after the annular convex portion 222 is press-fitted into the opening portion 213 of the flange plate 21. The restricting protrusion 226 is formed, for example, by riveting or the like.

[0035] The annular convex portion 222 has a third side surface 223. The third side surface 223 faces the first side in the axial direction. The flange plate 21 is disposed at the axial center portion of the annular convex portion 222. Therefore, the third side surface 223 of the annular convex portion 222 is located on the first side in the axial direction with respect to the first side surface 211 of the flange plate 21. In addition, the chips 225 of the annular convex portion 222 are generated between the first side surface 211 of the flange plate 21 and the third side surface 223 of the annular convex portion 222 on the outer peripheral surface of the annular convex portion 222.

[0036] <Input rotating member>

[0037] As shown Figure 2 in FIG. Figure 2 , the input rotating member 3 is configured to be rotatable relative to the output rotating member 2. The input rotating member 3 has a first plate 31 and a second plate 32. Both the first plate 31 and the second plate 32 are annular members having an opening at the center. The main body portion 221 of the hub 22 extends through the openings of the first plate 31 and the second plate 32. The inner peripheral surfaces of the first plate 31 and the second plate 32 are configured to be radially spaced apart from the outer peripheral surface of the main body portion 221.

[0038] The first plate 31 and the second plate 32 rotate integrally with each other. In addition, the first plate 31 and the second plate 32 cannot move relative to each other in the axial direction.

[0039] The first plate 31 and the second plate 32 are axially spaced apart from each other. The second plate 32 is disposed on the second axial side with respect to the first plate 31. Axially, a flange plate 21 is disposed between the first plate 31 and the second plate 32. The first plate 31 and the second plate 32 are configured to be rotatable relative to the flange plate 21.

[0040] The first plate 31 is disposed on the first axial side with respect to the flange plate 21. The first plate 31 and the flange plate 21 are axially spaced apart. In addition, the second plate 32 is disposed on the second axial side with respect to the flange plate 21. The second plate 32 and the flange plate 21 are axially spaced apart.

[0041] The first plate 31 and the second plate 32 each have a plurality of window portions 311, 321. The respective window portions 311, 321 are circumferentially spaced apart from each other. Each of the window portions 311, 321 is configured to receive an elastic member 4. Each of the window portions 311, 321 is disposed at a position overlapping with each of the receiving holes 214 when viewed axially.

[0042] <Elastic member>

[0043] The elastic member 4 is configured to elastically connect the input rotating member 3 and the output rotating member 2 in the rotational direction. That is, the elastic member 4 elastically connects the flange plate 21 and the first plate 31 in the rotational direction. In addition, the elastic member 4 elastically connects the flange plate 21 and the second plate 32 in the rotational direction. The elastic member 4 is, for example, a helical spring.

[0044] The elastic member 4 is received in the receiving hole 214 of the flange plate 21. In addition, the elastic member 4 is received in the window portion 311 of the first plate 31 and also in the window portion 321 of the second plate 32.

[0045] <First intermediate member>

[0046] The first intermediate member 5 is axially disposed between the flange plate 21 and the first plate 31. The first intermediate member 5 is annular and extends circumferentially. The first intermediate member 5 is configured to rotate integrally with the flange plate 21. In addition, the first intermediate member 5 may rotate relative to the flange plate 21 within a predetermined range.

[0047] The first intermediate member 5 is configured to be rotatable relative to the first plate 31. By rotating the first intermediate member 5 relative to the first plate 31, frictional force is generated.

[0048] Figure 4 is an enlarged cross-sectional view showing the periphery of the accommodation space S formed by the first intermediate member 5. As Figure 4 shown, the first intermediate member 5 has a first inner wall surface 51 and a second inner wall surface 52. The first inner wall surface 51 faces the first side surface 211 of the flange plate 21. That is, the first inner wall surface 51 faces the second side in the axial direction.

[0049] The first inner wall surface 51 and the first side surface 211 are axially spaced apart. The distance L1 between the first inner wall surface 51 and the first side surface 211 is, for example, about 1.5 mm or more and 4.0 mm or less. In addition, the first inner wall surface 51 and the third side surface 223 are axially spaced apart. The interval between the first inner wall surface 51 and the third side surface 223 is, for example, about 0.05 mm or more and 1.0 mm or less.

[0050] The first inner wall surface 51 extends circumferentially. In addition, the first inner wall surface 51 is disposed on the first side in the axial direction with respect to the third side surface 223 of the annular convex portion 222, or is disposed at a position overlapping the third side surface 223 when viewed from the axial direction.

[0051] The second inner wall surface 52 faces the outer peripheral surface of the annular convex portion 222. That is, the second inner wall surface 52 faces radially inward. The second inner wall surface 52 is spaced apart from the outer peripheral surface of the annular convex portion 222. The distance L2 between the second inner wall surface 52 and the outer peripheral surface of the annular convex portion 222 is, for example, about 1.5 mm or more and 3.5 mm or less. The second inner wall surface 52 extends from the first inner wall surface 51 to the first side surface 211. The second inner wall surface 52 extends circumferentially.

[0052] The first inner wall surface 51, the second inner wall surface 52, the first side surface 211, and the outer peripheral surface of the annular convex portion 222 define an annular accommodation space S. The accommodation space S is configured to accommodate the chips 225 generated by press-fitting. In this way, the chips 225 are enclosed in the accommodation space S. Therefore, even if a part of the chips 225 detaches from the annular convex portion 222, they will not be caught between the components of the damping device 100. Therefore, it is possible to prevent the chips 225 from hindering the smooth operation of the damping device 100.

[0053] As Figure 3As shown, the first intermediate member 5 has a cylindrical portion 53, a disk portion 54, and a protruding portion 55. The cylindrical portion 53 extends in the axial direction. The cylindrical portion 53 is disposed on the outer peripheral surface of the main body portion 221 of the hub 22. That is, the inner peripheral surface of the cylindrical portion 53 abuts against the outer peripheral surface of the main body portion 221. In addition, a part of the inner peripheral surface of the cylindrical portion 53 is disposed at an interval from the outer peripheral surface of the main body portion 221. Figure 3 This is a cross section of the portion that separates this interval.

[0054] The cylindrical portion 53 is disposed between the first plate 31 and the main body portion 221 in the radial direction. The cylindrical portion 53 extends through the opening of the first plate 31. The side surface of the cylindrical portion 53 facing the second side in the axial direction constitutes the first inner wall surface 51.

[0055] The disk portion 54 extends radially outward from the end portion of the cylindrical portion 53 on the second side in the axial direction. The disk portion 54 is disposed between the first plate 31 and the flange plate 21 in the axial direction. The side surface of the disk portion 54 facing the first side in the axial direction abuts against the first plate 31.

[0056] The protruding portion 55 protrudes axially from the disk portion 54 toward the flange plate 21. That is, the protruding portion 55 protrudes toward the second side in the axial direction from the disk portion 54. The protruding portion 55 abuts against the flange plate 21. The protruding portion 55 is annular and extends in the circumferential direction. The protruding portion 55 is disposed radially outside the cylindrical portion 53. The inner peripheral surface of the protruding portion 55 constitutes the second inner wall surface 52.

[0057] The second intermediate member 6 is disposed between the flange plate 21 and the second plate 32 in the axial direction. The second intermediate member 6 is annular and extends in the circumferential direction. The second intermediate member 6 is configured to rotate integrally with the second plate 32.

[0058] The second intermediate member 6 is configured to be rotatable relative to the flange plate 21. A first disc spring 61 is disposed between the second intermediate member 6 and the second plate 32. The first disc spring 61 biases the second intermediate member 6 toward the flange plate 21 in the axial direction. By the relative rotation of the second intermediate member 6 and the flange plate 21, frictional force is generated.

[0059] <Friction Disk>

[0060] As Figure 2 shown, the friction disk 7 is mounted on the outer peripheral end portion of the input rotating member 3. Specifically, the friction disk 7 is mounted on the first plate 31 by a fastening member 37. In addition, the friction disk 7 may also be mounted on the second plate 32. The friction disk 7 rotates integrally with the input rotating member 3. In addition, as the fastening member 37, a rivet can be exemplified.

[0061] The friction disk 7 is annular. The friction disk 7 has a support plate 71, a first friction member 72, and a second friction member 73. The support plate 71, the first friction member 72, and the second friction member 73 rotate integrally with each other.

[0062] The support plate 71 is mounted on the first plate 31. For example, the support plate 71 is mounted on the first plate 31 by the fastening member 37. In addition, the support plate 71 is a member separate from the first plate 31, but the support plate 71 may also be integrally formed as one member with the first plate 31.

[0063] The first friction member 72 and the second friction member 73 are annular. The first friction member 72 is mounted on one side surface of the support plate 71, and the second friction member 73 is mounted on the other side surface of the support plate 71. The first friction member 72 and the second friction member 73 rotate integrally with the support plate 71.

[0064] When a torque equal to or greater than a predetermined value is input to the damper device 100, the friction disk 7 slides on the side plate 81 and the pressure plate 83 via the first friction member 72 and the second friction member 73 and rotates relative to the side plate 81 and the pressure plate 83. On the other hand, when a torque less than the predetermined value is input, the friction disk 7 rotates integrally with the side plate 81 and the pressure plate 83.

[0065] [Torque limiter unit]

[0066] As Figure 2 shown, the torque limiter unit 12 is configured to be rotatable about the rotation axis O. The torque limiter unit 12 is disposed on the second axial side with respect to the flywheel. The torque limiter unit 12 is annular. The torque limiter unit 12 is mounted on the flywheel.

[0067] The torque limiter unit 12 is configured to limit the torque transmitted between the flywheel and the damper unit 11. That is, the torque limiter unit 12 is configured to limit the transmission of a torque equal to or greater than a predetermined value in the damper device 100. The torque limiter unit 12 is configured to frictionally engage with the friction disk 7. In addition, the torque limiter unit 12 clamps the friction disk 7 in the axial direction.

[0068] The torque limiter unit 12 includes a side plate 81, a cover plate 82, a pressure plate 83, and a second disc spring 84.

[0069] The side plate 81 and the cover plate 82 are mounted on the flywheel. The side plate 81 and the cover plate 82 rotate integrally with the flywheel. The side plate 81 and the cover plate 82 are annular. The cover plate 82 is disposed on the second axial side with respect to the side plate 81. The plate thickness of the cover plate 82 is thinner than that of the side plate 81.

[0070] The pressure plate 83 is annular. The pressure plate 83 is disposed axially between the side plate 81 and the cover plate 82. Specifically, the pressure plate 83 is disposed axially between the second friction member 73 and the second disc spring 84. The pressure plate 83 is configured to rotate integrally with the side plate 81. In addition, the pressure plate 83 is capable of moving axially relative to the side plate 81.

[0071] The second disc spring 84 is axially disposed between the cover plate 82 and the pressure plate 83. The second disc spring 84 applies a force to the pressure plate 83 toward the first axial side. That is, the second disc spring 84 applies a force to the pressure plate 83 toward the friction disc 7. Thereby, the friction disc 7 is clamped between the pressure plate 83 and the side plate 81.

[0072] [Modified Example]

[0073] The present invention is not limited to the above-described embodiments, and various deformations or modifications can be made without departing from the scope of the present invention. In addition, the following modified examples can be applied simultaneously.

[0074] (a) In the above embodiment, the damping device 100 has the torque limiter unit 12, but the structure of the damping device 100 is not limited thereto. For example, the damping device 100 may not have the torque limiter unit 12.

[0075] (b) In the above embodiment, the damping device 100 has the first plate 31 and the second plate 32 as the input rotating member 3, but the structure of the input rotating member 3 is not limited thereto. For example, the input rotating member 3 may not have the second plate 32. In this case, the damping device 100 may not have the second intermediate member 6.

[0076] (c) In the above embodiment, the first plate 31 constitutes the input rotating member 3, and the flange plate 21 and the hub 22 constitute the output rotating member 2, but the structure of the damping device 100 is not limited thereto. For example, it may also be that the first plate 31 constitutes the output rotating member, and the flange plate 21 and the hub 22 constitute the input rotating member. That is, torque may be input from the flange plate 21 and the hub 22 and output via the first plate 31.

[0077] (d) In the above embodiment, an internal combustion engine is disposed on the first axial side with respect to the damping device 100, and an output side component is disposed on the second axial side, but the arrangement of the damping device 100 is not limited thereto. For example, an internal combustion engine may also be disposed on the second axial side with respect to the damping device 100, and an output side component may be disposed on the first axial side.

[0078] Explanation of Reference Numerals

[0079] 4: Elastic member; 5: First intermediate member; 51: First inner wall surface; 52: Second inner wall surface; 21: Flange plate; 211: First side surface; 212: Second side surface; 213: Opening; 22: Hub; 221: Main body portion; 222: Circular ring convex portion; 223: Third side surface; 31: First plate; 100: Damping device; S: Accommodation space.

Claims

1. A damping device comprising: A flange plate having a first side surface facing a first side in an axial direction, a second side surface facing a second side in an axial direction, and an opening formed in the center; A hub having a main body and an annular convex portion, and configured to rotate integrally with the flange plate, wherein the main body extends in the axial direction, and the annular convex portion extends in the circumferential direction on the outer peripheral surface of the main body and is pressed into the opening of the flange plate; A first plate is arranged at a first side in the axial direction at a distance from the flange plate; an elastic member elastically connecting the flange plate to the first plate; and an intermediate member, arranged between the flange plate and the first plate in the axial direction, The annular protrusion has a third side surface facing the first side in the axial direction, The third side surface is located at a first side in the axial direction relative to the first side surface of the flange plate. The intermediate member has a first inner wall surface and a second inner wall surface, the first inner wall surface is opposed to the first side surface with a gap, and the second inner wall surface is opposed to the outer peripheral surface of the annular convex portion with a gap, The first inner wall surface, the second inner wall surface, the first side surface, and the outer peripheral surface of the annular convex portion define an annular storage space.

2. The damping device according to claim 1, wherein: The third side surface is arranged spaced apart from the first inner wall surface in the axial direction.

3. The damping device according to claim 1, wherein: The annular convex portion has chips stored in the storage space.

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