Friction disc and damping device

Abstract

The invention relates to a friction disc and a damper device, and provides a friction disc capable of realizing low cost. The supporting plate is provided with a first clamping convex part, a first concave part, a second clamping convex part and a second concave part. The first engagement protrusion protrudes from the first side surface toward a first side in the axial direction. The first recess is disposed at a position overlapping the first engagement protrusion when viewed in the axial direction. The first recess is recessed from the second side toward the first side in the axial direction. The second engagement protrusion protrudes from the second side surface toward a second side in the axial direction. The second recessed portion is disposed at a position overlapping the second engaging protruding portion when viewed in the axial direction. The second recess is recessed from the first side toward a second side in the axial direction. The first friction material has a first engagement recess that engages with the first engagement protrusion. The second friction material has a second engagement recess that engages with the second engagement protrusion.

Description

Technical Field

[0001] The present invention relates to a friction disk and a vibration damping device. Background Art

[0002] A vibration damping device or the like has a friction disk for frictional engagement. The friction disk has a support plate and a pair of friction materials. The pair of friction materials are fixed to the support plate by rivets so as to rotate integrally with the support plate.

[0003] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2020-169683 Summary of the Invention

[0004] Cost reduction of the friction disk is desired. Therefore, the technical problem of the present invention is to provide a friction disk capable of achieving cost reduction.

[0005] The friction disk according to the first aspect includes a support plate, a first friction material, and a second friction material. The support plate has a first side surface and a second side surface. 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 first friction material is mounted on the first side surface of the support plate. The second friction material is mounted on the second side surface of the support plate. The support plate has a first engaging convex portion, a first concave portion, a second engaging convex portion, and a second concave portion. The first engaging convex portion protrudes from the first side surface toward the first side in the axial direction. The first concave portion is disposed at a position overlapping the first engaging convex portion when viewed in the axial direction. The first concave portion recesses from the second side surface toward the first side in the axial direction. The second engaging convex portion protrudes from the second side surface toward the second side in the axial direction. The second concave portion is disposed at a position overlapping the second engaging convex portion when viewed in the axial direction. The second concave portion recesses from the first side surface toward the second side in the axial direction. The first friction material has a first engaging concave portion that engages with the first engaging convex portion. The second friction material has a second engaging concave portion that engages with the second engaging convex portion.

[0006] According to this structure, the first engaging convex portion engages with the first engaging concave portion, whereby the first friction material can rotate integrally with the support plate. Similarly, the second engaging convex portion engages with the second engaging concave portion, whereby the second friction material can rotate integrally with the support plate. As a result, it is possible to omit the rivets for rotating the first and second friction materials integrally with the support plate, and cost reduction can be achieved. In addition, it is not necessary to form holes for riveting in the first and second friction materials. Therefore, the widths of the first and second friction materials can be reduced, and cost reduction can also be achieved.

[0007] Based on the friction disk according to the first aspect, the friction disk according to the second aspect is configured as follows. When viewed in the axial direction, at least one of the first engaging convex portion and the second engaging convex portion has an elliptical shape.

[0008] Based on the friction disks involved in the first or second mode, the friction disk involved in the third mode is configured as follows. The support plate has a slit and an anchoring portion. The slit extends from the outer peripheral surface radially inward. The anchoring portion projects from the edge of the slit toward the first side in the axial direction or the second side in the axial direction. The anchoring portion bites into the first friction material or the second friction material.

[0009] Based on the friction disks involved in any one of the first to third modes, the friction disk involved in the fourth mode is configured as follows. The support plate has a plurality of first slits, a plurality of second slits, a plurality of first anchoring portions, and a plurality of second anchoring portions. Each first slit extends from the outer peripheral surface radially inward. The first slits are arranged at intervals in the circumferential direction. Each second slit extends from the outer peripheral surface radially inward. The second slits are arranged at intervals in the circumferential direction. Each first anchoring portion projects from the edge of each first slit toward the first side in the axial direction. Each first anchoring portion bites into the first friction material. Each second anchoring portion projects from the edge of each second slit toward the second side in the axial direction. Each second anchoring portion bites into the second friction material.

[0010] Based on the friction disk involved in the fourth mode, the friction disk involved in the fifth mode is configured as follows. The first slits and the second slits are alternately arranged in the circumferential direction.

[0011] Based on the friction disk involved in the fourth or fifth mode, the friction disk involved in the sixth mode is configured as follows. At least one of the first and second engaging convex portions is arranged between the first slit and the second slit in the circumferential direction.

[0012] Based on the friction disks involved in any one of the first to sixth modes, the friction disk involved in the seventh mode is configured as follows. The first engaging concave portion has a large-diameter portion and a small-diameter portion. The large-diameter portion opens toward the support plate in the axial direction. The large-diameter portion houses the first engaging convex portion. The small-diameter portion communicates with the large-diameter portion in the axial direction. The small-diameter portion opens toward the opposite side of the support plate. When observed in the axial direction, the small-diameter portion is smaller than the large-diameter portion. When observed in the axial direction, the small-diameter portion is smaller than the first engaging convex portion.

[0013] Based on the friction disks involved in any one of the first to seventh modes, the friction disk involved in the eighth mode is configured as follows. The support plate has a plurality of first engaging convex portions and a plurality of second engaging convex portions. The plurality of first engaging convex portions and the plurality of second engaging convex portions are alternately arranged in the circumferential direction.

[0014] Based on the friction disks involved in any one of the first to eighth modes, the friction disk involved in the ninth mode is configured as follows. The first friction material has a first sliding surface and a first mounting surface. The first sliding surface faces the first side in the axial direction. The first mounting surface faces the second side in the axial direction. The first mounting surface abuts against the support plate. The surface roughness of the first mounting surface is larger than that of the first sliding surface.

[0015] The vibration damping device according to the tenth aspect includes a vibration damping unit and a torque limiting unit. The vibration damping unit has an input rotating body, an output rotating body, an elastic member, and a friction disk according to any one of the first to ninth aspects. The elastic member is configured to elastically connect the input rotating body and the output rotating body. The friction disk is mounted on the input rotating body or the output rotating body. The torque limiting unit is configured to frictionally engage with the friction disk. The torque limiting unit axially clamps the friction disk.

[0016] Based on the vibration damping device according to the tenth aspect, the vibration damping device according to the eleventh aspect is configured as follows. The torque limiting unit has a pressing plate and a biasing member. The biasing member biases the pressing plate toward the friction disk. The biasing member has a contact portion that contacts the pressing plate. When viewed axially, the contact portion overlaps with the first engaging convex portion.

[0017] According to the present invention, cost reduction can be achieved. Description of the Drawings

[0018] Figure 1 is a front view of the vibration damping device.

[0019] Figure 2 is Figure 1 a sectional view taken along line II-II of

[0020] Figure 3 is a sectional view of the friction disk.

[0021] Figure 4 is a perspective view of the support plate.

[0022] Figure 5 is a sectional view of the friction disk.

[0023] Figure 6 is a sectional view of the friction disk.

[0024] Figure 7 is Figure 3 a sectional view taken along line VII-VII of

[0025] Figure 8 is a view showing the first or second engaging convex portion when viewed axially.

[0026] Figure 9 is a sectional view of the torque limiting unit and the friction disk.

[0027] Figure 10 is a front view of the friction disk according to the modified example.

[0028] Figure 11 is Figure 10 a sectional view taken along line XI-XI of

[0029] Description of Reference Numerals

[0030] 3: Torque limiting unit; 4: Vibration damping unit; 41: Input rotating body; 42: Output rotating body; 43: Elastic member; 5: Friction disk; 51: Support plate; 511: First side; 512: Second side; 513: Slit; 513a: First slit; 513b: Second slit; 514: Anchoring portion; 514a: First anchoring portion; 514b: Second anchoring portion; 515: First engaging convex portion; 516: First concave portion; 517: Second engaging convex portion; 518: Second concave portion; 52: First friction material; 521: First engaging concave portion; 522: Large diameter portion; 523: Small diameter portion; 53: Second friction material; 531: Second engaging concave portion; 100: Vibration damping device. Detailed implementation manner

[0031] Hereinafter, the friction disk 5 and the vibration 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 friction disk 5 and the vibration damping device 100 extends. In addition, 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, and the second side in the axial direction refers to Figure 2 the right side.

[0032] Figure 1 is the front view of the vibration 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 and

[0033] [Vibration damping unit]

[0034] The vibration damping unit 4 is mounted on the torque limiting unit 3. The vibration damping unit 4 is configured to attenuate rotational fluctuations. The vibration damping unit 4 includes an input rotating body 41, an output rotating body 42, an elastic member 43, and a friction disk 5.

[0035] <Input rotating body>

[0036] The input rotating body 41 has a first disk 41a and a second disk 41b. Both the first disk 41a and the second disk 41b are annular members having a central hole. The first disk 41a and the second disk 41b rotate integrally with each other. In addition, the first disk 41a and the second disk 41b cannot move relative to each other in the axial direction.

[0037] The first disk 41a and the second disk 41b are arranged at intervals in the axial direction. The second disk 41b is arranged on the second side in the axial direction with respect to the first disk 41a.

[0038] The first disk 41a and the second disk 41b each have a plurality of window portions 411a, 411b. In addition, in the present embodiment, the first disk 41a and the second disk 41b each have 4 window portions 411a, 411b, but their numbers are not limited to this.

[0039] The respective window portions 411a, 411b are arranged at intervals in the circumferential direction. Each window portion 411 is configured to house the elastic member 43.

[0040] <Output rotating body>

[0041] The output rotating body 42 is configured to transmit the torque from the input rotating body 41 to the output-side member. The output rotating body 42 is arranged between the first disk 41a and the second disk 41b in the axial direction. The output rotating body 42 is arranged so as to be able to rotate relative to the first disk 41a and the second disk 41b.

[0042] The output rotating body 42 has a hub 421 and a flange plate 422. The hub 421 and the flange plate 422 are integrally formed as one member, but may also be configured as separate and independent members.

[0043] The hub 421 is tubular and is arranged in the central holes of the first disk 41a and the second disk 41b. A spline hole extending in the axial direction is formed in the inner peripheral portion of the hub 421. The input shaft of the output-side member can be spline-fitted into the spline hole.

[0044] The flange plate 422 extends radially from the outer peripheral surface of the hub 421. The flange plate 422 is formed in an annular shape. The flange plate 422 is arranged so as to be able to rotate relative to the first disk 41a and the second disk 41b. The flange plate 422 is arranged between the first disk 41a and the second disk 41b in the axial direction.

[0045] The flange plate 422 has a plurality of receiving holes 423. In addition, in the present embodiment, the flange plate 422 has 4 receiving holes 423, but the number is not limited to this. The respective receiving holes 423 are arranged at intervals in the circumferential direction. Each receiving hole 423 is configured to house the elastic member 43. Each receiving hole 423 is arranged at a position overlapping the respective window portions 411a, 411b when viewed in the axial direction.

[0046] <Elastic member>

[0047] The elastic member 43 is configured to elastically connect the input rotating body 41 and the output rotating body 42 in the rotational direction. The elastic member 43 is, for example, a helical spring.

[0048] The elastic member 43 is received in the receiving hole 423 of the output rotating body 42. In addition, the elastic member 43 is received in the window portion 411a of the first disk 41a and is also received in the window portion 411b of the second disk 41b.

[0049] <Friction disk>

[0050] The friction disk 5 is mounted on the outer peripheral end portion of the input rotating body 41. Specifically, the friction disk 5 is mounted on the first disk 41a by the fastening member 37. In addition, the friction disk 5 may be mounted on the second disk 41b. The friction disk 5 rotates integrally with the input rotating body 41. In addition, as the fastening member 37, a rivet can be exemplified.

[0051] Figure 3 is an enlarged cross-sectional view of the friction disk 5. As Figure 2 and Figure 3 shown, the friction disk 5 can rotate about the rotation axis O. The friction disk 5 is annular. The friction disk 5 has a support plate 51, a first friction material 52, and a second friction material 53. The support plate 51, the first friction material 52, and the second friction material 53 rotate integrally with each other.

[0052] <Support plate>

[0053] Figure 4 is a perspective view of the support plate 51, Figure 5 and Figure 6 is an enlarged cross-sectional view of the friction disk 5 for showing the engaging portion, Figure 7 is Figure 3 a sectional view taken along line VII-VII of Figures 3 to 7 shown, the support plate 51 is an annular disk. The support plate 51 is arranged to be rotatable about the rotation axis O.

[0054] The support plate 51 is mounted on the first disk 41a. For example, the support plate 51 is mounted on the first disk 41a by the fastening member 37. In addition, although the support plate 51 is a member separate from the first disk 41a, the support plate 51 may be integrally formed as one member with the first disk 41a.

[0055] The support plate 51 has a first side surface 511, a second side surface 512, a plurality of slits 513, a plurality of anchoring portions 514, a plurality of first engaging convex portions 515, a plurality of first concave portions 516, a plurality of second engaging convex portions 517, and a plurality of second concave portions 518. In addition, the support plate 51 has a plurality of insertion holes 519 for inserting a positioning jig.

[0056] The first side surface 511 is the surface of the two side surfaces of the support plate 51 facing the first side in the axial direction. When observed in the axial direction, the first side surface 511 is annular. The first side surface 511 has no step difference and the axial position is constant. That is, the first side surface 511 is located on the same plane as a whole.

[0057] The second side surface 512 is the surface of the two side surfaces of the support plate 51 facing the second side in the axial direction. The second side in the axial direction is the opposite side of the first side in the axial direction. When observed in the axial direction, the second side surface 512 is annular. The second side surface 512 has no step difference and the axial position is constant. That is, the second side surface 512 is located on the same plane as a whole.

[0058] Each slit 513 extends from the outer peripheral surface of the support plate 51 radially inward. The slits 513 are arranged at intervals in the circumferential direction. Each slit 513 penetrates the support plate 51 in the thickness direction.

[0059] As Figure 7 shown, the anchoring portion 514 projects from the edge of the slit 513 toward the first side or the second side in the axial direction. In addition, in the present embodiment, the anchoring portion 514 projects toward the first side in the axial direction, but the anchoring portion 514 may also project toward the second side in the axial direction. The protruding amount of the anchoring portion 514 is not particularly limited, but is, for example, about 0.1 to 0.5 mm.

[0060] The anchoring portion 514 is formed along the edge of the slit 513. In addition, the anchoring portion 514 may be formed continuously or intermittently along the edge of the slit 513. The anchoring portion 514 projects from the first side surface 511 of the support plate 51 toward the first side in the axial direction. The anchoring portion 514 bites into the first friction material 52. In addition, the anchoring portion 514 may be formed at the edges of all the slits 513 or at the edges of a part of the slits 513. When the anchoring portion 514 projects toward the second side in the axial direction, the anchoring portion 514 bites into the second friction material 53. Through this anchoring portion 514, the support plate 51 and the first friction material 52 or the second friction material 53 can be made to rotate integrally more reliably.

[0061] As Figure 4 and Figure 5As shown, the first engaging convex portion 515 protrudes from the first side surface 511 toward the first side in the axial direction. The first engaging convex portion 515 is disposed between a pair of circumferentially adjacent slits 513. The first engaging convex portion 515 has a solid cylindrical shape. When viewed in the axial direction, the first engaging convex portion 515 has a circular shape. Alternatively, the first engaging convex portion 515 can be formed in an elliptical shape (see Figure 8 ).

[0062] The first concave portion 516 is formed in the second side surface 512 of the support plate 51. The first concave portion 516 is recessed from the second side surface 512 toward the first side in the axial direction. That is, the first concave portion 516 opens toward the second side in the axial direction.

[0063] When viewed in the axial direction, the first concave portion 516 has a circular shape. When viewed in the axial direction, the first concave portion 516 overlaps with the first engaging convex portion 515. When viewed in the axial direction, the first concave portion 516 is larger than the first engaging convex portion 515. The first engaging convex portion 515 and the first concave portion 516 can be formed by, for example, embossing.

[0064] As Figure 6 shown, the second engaging convex portion 517 protrudes from the second side surface 512 toward the second side in the axial direction. The second engaging convex portion 517 has a solid cylindrical shape. When viewed in the axial direction, the second engaging convex portion 517 has a circular shape. Alternatively, the second engaging convex portion 517 can be formed in an elliptical shape (see Figure 8 ).

[0065] The second engaging convex portion 517 is disposed between a pair of circumferentially adjacent slits 513. Each second engaging convex portion 517 and each first engaging convex portion 515 are alternately arranged in the circumferential direction. That is, on the second side surface 512, the second engaging convex portion 517 and the first concave portion 516 are alternately arranged in the circumferential direction.

[0066] The second concave portion 518 is formed in the first side surface 511 of the support plate 51. The second concave portion 518 is recessed from the first side surface 511 toward the second side in the axial direction. That is, the second concave portion 518 opens toward the first side in the axial direction.

[0067] When viewed in the axial direction, the second concave portion 518 has a circular shape. When viewed in the axial direction, the second concave portion 518 overlaps with the second engaging convex portion 517. When viewed in the axial direction, the second concave portion 518 is larger than the second engaging convex portion 517. The second engaging convex portion 517 and the second concave portion 518 can be formed by, for example, embossing.

[0068] The second concave portion 518 and the first concave portion 516 are alternately arranged in the circumferential direction. That is, on the first side surface 511, the second concave portion 518 and the first engaging convex portion 515 are alternately arranged in the circumferential direction.

[0069] <First and Second Friction Materials>

[0070] As Figure 2 , 3 As shown in FIGS. 5 to 7, the first friction material 52 is annular. The first friction material 52 is mounted on the first side surface 511 of the support plate 51. The first friction material 52 rotates integrally with the support plate 51. Accordingly, the friction disk 5 is configured to be frictionally engaged with the side plate 31 via the first friction material 52.

[0071] The first friction material 52 has a first sliding surface 524 and a first mounting surface 525. The first sliding surface 524 is a surface facing the opposite side of the support plate 51 in the axial direction. That is, the first sliding surface 524 faces the first side in the axial direction. The first sliding surface 524 abuts against the side plate 31. When the friction disk 5 slides relative to the torque limiting unit 3, the first sliding surface 524 slides relative to the side plate 31.

[0072] The first mounting surface 525 is a surface facing the support plate 51 side in the axial direction. That is, the first mounting surface 525 faces the second side in the axial direction. The first mounting surface 525 abuts against the support plate 51.

[0073] The first mounting surface 525 has a surface roughness different from that of the first sliding surface 524. For example, the surface roughness (arithmetic mean roughness) of the first mounting surface 525 is larger than that of the first sliding surface 524. For example, the first sliding surface 524 is polished, but on the other hand, the first mounting surface 525 is not polished, whereby the surface roughness of the first mounting surface 525 can be made relatively large.

[0074] The second friction material 53 is annular. The second friction material 53 is mounted on the second side surface 512 of the support plate 51. The second friction material 53 rotates integrally with the support plate 51. Accordingly, the friction disk 5 is configured to be frictionally engaged with the pressing plate 33 via the second friction material 53.

[0075] The second friction material 53 has a second sliding surface 534 and a second mounting surface 535. The second sliding surface 534 is a surface facing the opposite side of the support plate 51 in the axial direction. That is, the second sliding surface 534 faces the second side in the axial direction. The second sliding surface 534 abuts against the pressing plate 33. When the friction disk 5 slides relative to the torque limiting unit 3, the second sliding surface 534 slides relative to the pressing plate 33.

[0076] The second mounting surface 535 is a surface facing the support plate 51 side in the axial direction. That is, the second mounting surface 535 faces the first side in the axial direction. The second mounting surface 535 abuts against the support plate 51.

[0077] The second mounting surface 535 has a surface roughness different from that of the second sliding surface 534. For example, the surface roughness (arithmetic mean roughness) of the second mounting surface 535 is larger than that of the second sliding surface 534. For example, the second sliding surface 534 is polished, while on the other hand, the second mounting surface 535 is not polished, whereby the surface roughness of the second mounting surface 535 can be made relatively large.

[0078] As Figure 5 shown, the first friction material 52 has a plurality of first engaging recesses 521. The respective first engaging recesses 521 are arranged at intervals in the circumferential direction. When viewed in the axial direction, the respective first engaging recesses 521 overlap with the respective first engaging protrusions 515. The respective first engaging recesses 521 are formed on the surface of the first friction material 52 on the side of the support plate 51. The first engaging recesses 521 are recessed toward the first side in the axial direction. In addition, in the present embodiment, the first engaging recesses 521 penetrate the first friction material 52 in the axial direction.

[0079] The first engaging recess 521 engages with the first engaging protrusion 515 of the support plate 51. That is, the first engaging protrusion 515 is disposed within the first engaging recess 521. In addition, the gap between the first engaging protrusion 515 and the first engaging recess 521 is about 0.05 to 0.60 mm on one side. Thus, since the first engaging protrusion 515 engages with the first engaging recess 521, the first friction material 52 and the support plate 51 rotate integrally. In addition, when viewed in the axial direction, the first engaging recess 521 is circular in shape.

[0080] Specifically, the first engaging recess 521 has a large-diameter portion 522 and a small-diameter portion 523. The small-diameter portion 523 is disposed on the first side in the axial direction with respect to the large-diameter portion 522. The large-diameter portion 522 and the small-diameter portion 523 communicate with each other.

[0081] The large-diameter portion 522 opens toward the support plate 51. That is, the large-diameter portion 522 opens toward the second side in the axial direction. The large-diameter portion 522 houses the first engaging protrusion 515.

[0082] The small-diameter portion 523 opens to the side opposite to the support plate 51. That is, the small-diameter portion 523 opens toward the first side in the axial direction. When viewed in the axial direction, the small-diameter portion 523 is smaller than the large-diameter portion 522. That is, the diameter of the small-diameter portion 523 is smaller than the diameter of the large-diameter portion 522. In addition, when viewed in the axial direction, the small-diameter portion 523 is smaller than the first engaging protrusion 515.

[0083] According to this structure, when the surfaces of the first friction material 52 are different between the front and the back, the first friction material 52 can be mounted on the support plate 51 without misidentifying the front and the back of the first friction material 52.

[0084] As Figure 6As shown, the second friction material 53 has a plurality of second engaging recesses 531. The second engaging recesses 531 are arranged at intervals from each other in the circumferential direction. When viewed in the axial direction, each second engaging recess 531 overlaps with each second engaging protrusion 517. Each second engaging recess 531 is formed on the surface of the second friction material 53 on the side of the support plate 51. The second engaging recess 531 is recessed toward the second side in the axial direction. Further, in the present embodiment, the second engaging recess 531 penetrates the second friction material 53 in the axial direction.

[0085] The second engaging recess 531 engages with the second engaging protrusion 517 of the support plate 51. That is, the second engaging protrusion 517 is disposed within the second engaging recess 531. Further, the gap between the second engaging protrusion 517 and the second engaging recess 531 is about 0.05 to 0.60 mm on one side. Thus, since the second engaging protrusion 517 engages with the second engaging recess 531, the second friction material 53 rotates integrally with the support plate 51. Further, when viewed in the axial direction, the second engaging recess 531 is circular.

[0086] Specifically, the second engaging recess 531 has a large-diameter portion 532 and a small-diameter portion 533. The small-diameter portion 533 is disposed on the second side in the axial direction with respect to the large-diameter portion 532. The large-diameter portion 532 and the small-diameter portion 533 communicate with each other.

[0087] The large-diameter portion 532 opens toward the support plate 51. That is, the large-diameter portion 532 opens toward the first side in the axial direction. The large-diameter portion 532 houses the second engaging protrusion 517.

[0088] The small-diameter portion 533 opens toward the side opposite to the support plate 51. That is, the small-diameter portion 533 opens toward the second side in the axial direction. When viewed in the axial direction, the small-diameter portion 533 is smaller than the large-diameter portion 532. That is, the diameter of the small-diameter portion 533 is smaller than the diameter of the large-diameter portion 532. Further, when viewed in the axial direction, the small-diameter portion 533 is smaller than the second engaging protrusion 517.

[0089] According to this structure, when the front and back surfaces of the second friction material 53 are different, the second friction material 53 can be mounted on the support plate 51 without misidentifying the front and back of the second friction material 53.

[0090] If a torque equal to or greater than a predetermined value is input to the vibration damping device 100, the friction disk 5 slides relative to the side plate 31 and the pressure plate 33 via the first and second friction materials 52 and 53 and rotates relative to the side plate 31 and the pressure plate 33. On the other hand, if a torque less than the predetermined value is input, the friction disk 5 rotates integrally with the side plate 31 and the pressure plate 33.

[0091] [Torque Limiting Unit]

[0092] As Figure 2As shown, the torque limiting unit 3 is configured to be rotatable about the rotation axis O. The torque limiting unit 3 is disposed on the second axial side with respect to the flywheel. The torque limiting unit 3 is annular. The torque limiting unit 3 is mounted on the flywheel.

[0093] The torque limiting unit 3 is configured to limit the torque transmitted between the flywheel and the vibration damping unit 4. That is, the torque limiting unit 3 is configured to limit the transmission of torque above a predetermined value of the vibration damping device 100. The torque limiting unit 3 is configured to frictionally engage with the friction disk 5. In addition, the torque limiting unit 3 axially sandwiches the friction disk 5.

[0094] The torque limiting unit 3 includes a side plate 31, a cover plate 32, a pressing plate 33, and a disc spring 34 (an example of a biasing member).

[0095] The side plate 31 and the cover plate 32 are mounted on the flywheel. The side plate 31 and the cover plate 32 rotate integrally with the flywheel. The side plate 31 and the cover plate 32 are annular. The cover plate 32 is disposed on the second axial side with respect to the side plate 31. The thickness of the cover plate 32 is thinner than that of the side plate 31.

[0096] The pressing plate 33 is annular. The pressing plate 33 is axially disposed between the side plate 31 and the cover plate 32. Specifically, the pressing plate 33 is axially disposed between the second friction material 53 and the disc spring 34. The pressing plate 33 is configured to rotate integrally with the side plate 31. In addition, the pressing plate 33 is axially movable relative to the side plate 31.

[0097] The disc spring 34 is axially disposed between the cover plate 32 and the pressing plate 33. The disc spring 34 biases the pressing plate 33 toward the first axial side. That is, the disc spring 34 biases the pressing plate 33 toward the friction disk 5. Thereby, the friction disk 5 is sandwiched by the pressing plate 33 and the side plate 31.

[0098] Figure 9 is a cross-sectional view showing the arrangement relationship between the friction disk 5 and the torque limiting unit 3. As Figure 9 shown, the disc spring 34 has an abutting portion 341. The abutting portion 341 abuts against the pressing plate 33. The abutting portion 341 is an inner peripheral end portion or an outer peripheral end portion of the disc spring 34. In addition, in the present embodiment, the inner peripheral end portion of the disc spring 34 becomes the abutting portion 341. When viewed axially, the abutting portion 341 overlaps with each first engaging convex portion 515. That is, the abutting portion 341 and each first engaging convex portion 515 are in the same radial position. In addition, when viewed axially, the abutting portion 341 of the disc spring 34 also overlaps with the second engaging convex portion 517.

[0099] [Modification Example]

[0100] The present invention is not limited to the above-described embodiment, and various deformations or corrections can be made without departing from the scope of the present invention. In addition, the following modification examples can be applied simultaneously.

[0101] (a) In the above-described embodiment, the support plate 51 has the anchoring portions 514 that protrude only toward the first side in the axial direction or only toward the second side in the axial direction, but the structure of the support plate 51 is not limited thereto.

[0102] Figure 10 is the front view of the friction disk 5, Figure 11 is Figure 10 the sectional view taken along line XI-XI of Figure 10 and Figure 11 As shown in

[0103] the support plate 51 may also have a plurality of first slits 513a, a plurality of second slits 513b, a plurality of first anchoring portions 514a, and a plurality of second anchoring portions 514b. The plurality of first slits 513a and the plurality of second slits 513b are alternately arranged in the circumferential direction. The plurality of first slits 513a and the plurality of second slits 513b are arranged at intervals from each other in the circumferential direction.

[0104] The first anchoring portion 514a protrudes from the edge portion of the first slit 513a toward the first side in the axial direction. The first anchoring portion 514a bites into the first friction material 52.

[0105] The second anchoring portion 514b protrudes from the edge portion of the second slit 513b toward the second side in the axial direction. That is, the second anchoring portion 514b protrudes toward the opposite side of the first anchoring portion 514a. The second anchoring portion 514b bites into the second friction material 53. The first anchoring portion 514a and the second anchoring portion 514b are alternately arranged in the circumferential direction.

[0106] The first engaging convex portion 515 is arranged between the first slit 513a and the second slit 513b in the circumferential direction. That is, the first engaging convex portion 515 is arranged between the first anchoring portion 514a and the second anchoring portion 514b in the circumferential direction. In addition, the second engaging convex portion 517 is also arranged between the first slit 513a and the second slit 513b in the circumferential direction.

[0107] (b) In the above-described embodiment, the support plate 51 has the anchoring portions 514, but it may not have the anchoring portions 514.

[0108] (c) In the above-described embodiment, when viewed in the axial direction, the first engaging convex portion 515 and the second engaging convex portion 517 are formed in a circular shape or an elliptical shape, but the shapes of the first engaging convex portion 515 and the second engaging convex portion 517 are not limited thereto. For example, when viewed in the axial direction, the first engaging convex portion 515 and the second engaging convex portion 517 may also be rectangular, or may be other shapes.

[0109] (d) In the above-described embodiment, the side plate 31 is disposed on the first side in the axial direction with respect to the friction disk 5, and the pressing plate 33 is disposed on the second side in the axial direction, but the structure is not limited thereto. For example, it may also be that the side plate 31 is disposed on the second side in the axial direction with respect to the friction disk 5, and the pressing plate 33 is disposed on the first side in the axial direction.

[0110] (e) In the above-described embodiment, the internal combustion engine is disposed on the first side in the axial direction with respect to the vibration damping device 100, and the output side member is disposed on the second side in the axial direction, but the arrangement of the vibration damping device 100 is not limited thereto. For example, it may also be that the internal combustion engine is disposed on the second side in the axial direction with respect to the vibration damping device 100, and the output side member is disposed on the first side in the axial direction.

Claims

1. A friction disc, characterized in that: have: A support plate having a first side surface facing the first axial side and a second side surface facing the second axial side; a first friction material, mounted on the first side surface of the support plate; as well as a second friction material, mounted on the second side surface of the support plate, The support plate has: A first engaging protrusion protrudes from the first side surface toward a first side in the axial direction; A first recessed portion is arranged at a position overlapping with the first engaging protrusion when viewed in the axial direction, and is recessed from the second side surface toward the first side in the axial direction; A second engaging protrusion protrudes from the second side surface toward a second side in the axial direction; as well as The second recessed portion is arranged at a position overlapping with the second engaging protruding portion when viewed in the axial direction, and is recessed from the first side surface toward the second side in the axial direction. The first friction material has a first engaging recessed portion engaged with the first engaging convex portion, The second friction material has a second engagement recessed portion that engages with the second engagement protruding portion.

2. The friction disc according to claim 1, wherein: At least one of the first engaging protrusion and the second engaging protrusion has an elliptical shape when viewed in the axial direction.

3. The friction disc according to claim 1, wherein: The support plate has: A slit extending radially inward from the outer peripheral surface; as well as The anchor portion protrudes from the edge of the slit toward the first side in the axial direction or the second side in the axial direction and bites into the first friction material or the second friction material.

4. The friction disc according to claim 1, wherein: The support plate has: A plurality of first slits extend radially inward from the outer peripheral surface and are arranged at intervals from each other in the circumferential direction; A plurality of second slits extend radially inward from the outer peripheral surface and are arranged at intervals from each other in the circumferential direction; a plurality of first anchoring portions, projecting from the edge of each of the first slits toward a first side in the axial direction and biting into the first friction material; as well as A plurality of second anchor portions protrude from the edge of each of the second slits toward the second side in the axial direction and bite into the second friction material.

5. The friction disc according to claim 4, wherein: The first slits and the second slits are alternately arranged in the circumferential direction.

6. The friction disc according to claim 4, wherein: At least one of the first engaging protrusion and the second engaging protrusion is disposed between the first slit and the second slit in the circumferential direction.

7. The friction disc according to claim 1, wherein: The first engaging recess has: a large diameter portion, which opens toward the support plate in the axial direction and accommodates the first engaging protrusion; and The small diameter portion is connected to the large diameter portion in the axial direction and is open toward the opposite side of the support plate. The small diameter portion is smaller than the large diameter portion when viewed in the axial direction and is smaller than the first engaging protrusion when viewed in the axial direction.

8. The friction disc according to claim 1, wherein: The support plate has a plurality of the first engaging protrusions and a plurality of the second engaging protrusions. The plurality of first engaging protrusions and the plurality of second engaging protrusions are alternately arranged in the circumferential direction.

9. The friction disc according to claim 1, wherein: The first friction material has a first sliding surface facing a first side in the axial direction and a first mounting surface facing a second side in the axial direction and abutting against the support plate. The surface roughness of the first mounting surface is greater than that of the first sliding surface.

10. A vibration reduction device, characterized in that: have: A vibration reduction unit comprising an input rotating body, an output rotating body, an elastic member configured to elastically connect the input rotating body and the output rotating body, and a friction disk as described in any one of claims 1 to 9 mounted on the input rotating body or the output rotating body; as well as The torque limiting unit is configured to frictionally engage with the friction disk and sandwich the friction disk in the axial direction.

11. The vibration reduction device according to claim 10, wherein: The torque limiting unit includes a pressure plate and a biasing member for biasing the pressure plate toward the friction disk. The urging member has a contact portion that contacts the pressure plate. When viewed in the axial direction, the abutment portion overlaps with the first engaging protrusion.

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