Damper device

Abstract

To reduce the number of components of a damper device.SOLUTION: A first rotating body has a flange part 12. A second rotating body has: a first plate 21 disposed at the first axial side relative to the flange part 12; and a second plate 22 which is disposed at the second axial side relative to the flange part 12. An elastic member 3 elastically connects the first rotating body with the second rotating body. A friction plate 4 is disposed between the flange part 12 and the second plate 22 in an axial direction. A biasing member 6 biases the friction plate 4 to the second axial side. A first bush 51 has: a body 511 disposed between the flange part 12 and the first plate 21 in the axial direction; an extension part 512 extending from the body 511 to the second axial side; and an engagement part 513 disposed at the second plate side relative to the friction plate 4 and extending from the extension part 512 to the radial inner side.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a damper device. [Background technology]

[0002] In order to damp vibrations caused by torque fluctuations from a drive source, a damper device as shown in Patent Document 1 is provided in a power transmission path of a vehicle. This damper device has a pair of third plates fixed to each other by rivets. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5964272 Summary of the Invention [Problem to be solved by the invention]

[0004] There is a demand for reducing the number of parts in a damper device. Therefore, an object of the present invention is to provide a damper device that can reduce the number of parts. [Means for solving the problem]

[0005] The damper device according to the first aspect includes a first rotating body, a second rotating body, an elastic member, a friction plate, an urging member, and a first bush. The first rotating body has a flange portion. The second rotating body has a first plate and a second plate. The first plate is disposed on a first axial side with respect to the flange portion. The second plate is disposed on a second axial side with respect to the flange portion. The elastic member elastically connects the first rotating body and the second rotating body. The friction plate is disposed between the flange portion and the second plate in the axial direction. The urging member urges the friction plate toward the second axial side. The first bush has a main body portion, an extension portion, and an engagement portion. The main body portion is disposed between the flange portion and the first plate in the axial direction. The extension portion extends from the main body portion toward the second axial side. The engagement portion is disposed on the second axial side with respect to the friction plate. The engagement portion extends radially inward from the extension portion.

[0006] According to this configuration, the engagement portion of the first bush is disposed on the second axial side with respect to the friction plate. Therefore, the friction plate is engaged with the engagement portion of the first bush. Therefore, it is not necessary to prepare a separate part for fixing the friction plate in the axial direction, and it is possible to reduce the number of parts.

[0007] The damper device according to the second aspect is the damper device according to the first aspect, and is configured as follows: The extension portion has a base portion and a protrusion portion. The base portion has an abutment surface that abuts against the friction plate. The base portion extends from the main body portion to a second axial side. The protrusion portion extends from the base portion to the second axial side.

[0008] A damper device according to a third aspect is the damper device according to the first or second aspect, and is configured as follows: The first bush has a through hole extending in the axial direction. The through hole overlaps with the engagement portion when viewed in the axial direction.

[0009] The damper device according to a fourth aspect is the damper device according to the third aspect, and is configured as follows: the through hole has a first through portion and a second through portion. The second through portion is disposed on a second axial side relative to the first through portion. The second through portion has a smaller area in the axial view than the first through portion.

[0010] The damper device according to the fifth aspect is the damper device according to the fourth aspect, and is configured as follows: the second through-hole has a rectangular shape when viewed in the axial direction, and the first through-hole has a shape that combines a rectangular shape and a semicircular shape when viewed in the axial direction.

[0011] A damper device according to a sixth aspect is a damper device according to any one of the second to fifth aspects, and is configured as follows. The protrusion has a first support portion and a second support portion. The first support portion extends from the base portion to the second axial side. The second support portion extends from the base portion to the second axial side. A surface of the first support portion facing the second axial side is disposed on the first axial side of a surface of the second support portion facing the second side.

[0012] The damper device according to the seventh aspect is the damper device according to the sixth aspect, and is configured as follows: A surface of the first support portion facing the second axial direction is disposed on the first axial side of a surface of the friction plate facing the second axial direction.

[0013] The damper device according to an eighth aspect is the damper device according to the sixth or seventh aspect, and is configured as follows. The damper device further includes a second bush. The second bush is disposed between the friction plate and the second plate in the axial direction. The second bush is configured to rotate integrally with the second plate. The second support portion has an avoidance surface facing radially inward. The avoidance surface is an arc shape centered on the rotation axis when viewed in the axial direction. The avoidance surface faces an outer circumferential surface of the second bush.

[0014] A damper device according to a ninth aspect is the damper device according to any one of the second to eighth aspects, and is configured as follows. The damper device further includes a second bush. The second bush is arranged between the friction plate and the second plate in the axial direction. The second bush is configured to rotate integrally with the second plate. The elastic member includes a plurality of elastic members arranged in the circumferential direction. The friction plate has a friction portion and a protruding portion. The friction portion is slidable against the second bush. The protruding portion is arranged between the plurality of elastic members in the circumferential direction. The friction portion has a recessed portion. The recessed portion is recessed radially inward from the outer circumferential surface of the friction portion. The protruding portion engages with the recessed portion.

[0015] A damper device according to a tenth aspect is the damper device according to the ninth aspect, and is configured as follows: the friction plate has a protruding portion. The protruding portion is disposed within the recessed portion and protrudes radially outward. The engaging portion engages with the protruding portion. Effect of the Invention

[0016] According to the present invention, the number of parts of the damper device can be reduced. [Brief description of the drawings]

[0017] [Figure 1] FIG. [Diagram 2] FIG. 4 is an exploded perspective view of the damper device. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] An enlarged view of the first bush. [Figure 6] An enlarged view of the first friction plate and first bush. [Figure 7] FIG. [Figure 8] Cross-sectional view taken along line VIII-VIII in Figure 7. [Figure 9] Cross-sectional view of line IX-IX in Figure 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] [Overall configuration] Fig. 1 is a plan view of a damper device 100 according to this embodiment, which is mounted on a vehicle. Fig. 2 is a perspective view of the damper device 100 in an exploded state. Fig. 3 is an enlarged cross-sectional view of the damper device 100. In Fig. 3, line O-O is the rotation axis of the damper device 100. In Fig. 3, an engine (not shown) is disposed on the left side of the damper device 100, and a drive unit (not shown) including an electric motor, a transmission, etc. is disposed on the right side.

[0019] In the following description, the "axial direction" refers to the direction in which the rotation axis O of the damper device 100 extends, with the left side of FIG. 3 being the "first axial side" and the right side of FIG. 3 being the "second axial side". The "circumferential direction" refers to the circumferential direction of a circle centered on the rotation axis O. The counterclockwise direction in FIG. 1 is the "R1 side", and the clockwise direction in FIG. 1 is the "R2 side". The "radial direction" refers to the radial direction of the circle centered on the rotation axis O. The circumferential direction does not need to completely coincide with the circumferential direction of the circle centered on the rotation axis O, and the radial direction does not need to completely coincide with the diameter direction of the circle centered on the rotation axis O.

[0020] As shown in Figs. 1 to 3, the damper device 100 is disposed rotatably about a rotation axis O. The damper device 100 is provided between an engine and an input shaft (not shown) of a drive unit. The damper device 100 is configured to damp rotation fluctuations. The damper device 100 has a first rotating body 1, a second rotating body 2, a plurality of elastic members 3, a first friction plate 41, a second friction plate 42, first to fourth bushes 51 to 54, a first biasing member 61, and a second biasing member 62. The first friction plate 41 corresponds to the friction plate of the present invention, and the first biasing member 61 corresponds to the biasing member of the present invention.

[0021] [First rotating body] The first rotating body 1 is arranged to be rotatable around a rotation axis O. The first rotating body 1 is arranged to be rotatable relative to the second rotating body 2. Note that FIG. 1 shows a neutral state in which there is no torsion between the first rotating body 1 and the second rotating body 2. The first rotating body 1 is configured to transmit torque from the second rotating body 2 to a device on the output side.

[0022] The first rotating body 1 has a hub portion 11 and a flange portion 12. The hub portion 11 and the flange portion 12 are integrally formed as a single member. Note that the hub portion 11 and the flange portion 12 may be formed as separate members.

[0023] The hub portion 11 is cylindrical. An axially extending spline hole is formed in the hub portion 11. An input shaft, which is an output side member, can be spline-engaged with this spline hole.

[0024] The flange portion 12 extends radially from the outer circumferential surface of the hub portion 11. The flange portion 12 has a plurality of accommodating holes 121. In this embodiment, the flange portion 12 has four accommodating holes 121. The accommodating holes 121 are arranged in the circumferential direction.

[0025] Each accommodating hole 121 has an elastic member accommodating portion 121a and a notch 121b. The elastic member accommodating portion 121a is formed outside the notch 121b in the radial direction. The elastic member 3 is accommodated in the elastic member accommodating portion 121a. The notch 121b has a predetermined width in the circumferential direction.

[0026] The flange portion 12 has a stopper portion 122. The stopper portion 122 protrudes in the radial direction from the outer circumferential surface of the flange portion 12. The stopper portion 122 is disposed outside each of the accommodating holes 121 in the radial direction.

[0027] The flange portion 12 has a locking hole 123. In this embodiment, the flange portion 12 has two locking holes 123. The locking holes 123 penetrate the flange portion 12 in the axial direction. The locking holes 123 are formed between adjacent accommodating holes 121 in the circumferential direction. The locking holes 123 are formed at positions overlapping with the cutouts 121b when viewed in the circumferential direction. The locking holes 123 have a predetermined width in the circumferential direction.

[0028] [Second rotating body] The second rotating body 2 has a first plate 21 and a second plate 22. The first plate 21 and the second plate 22 are both annular members having a central hole. The first plate 21 and the second plate 22 are arranged to be rotatable around a rotation axis O. The first plate 21 and the second plate 22 are fastened together by a plurality of fastening members 101. For this reason, the first plate 21 and the second plate 22 are unable to rotate relative to each other. The fastening members 101 are, for example, rivets.

[0029] The first plate 21 and the second plate 22 are disposed at an interval from each other in the axial direction. The first plate 21 and the second plate 22 are immovable relative to each other in the axial direction. The first plate 21 is disposed on a first axial side with respect to the flange portion 12 of the first rotating body 1. The second plate 22 is disposed on a second axial side with respect to the flange portion 12. In other words, the flange portion 12 is disposed between the first plate 21 and the second plate 22 in the axial direction.

[0030] The first plate 21 has a plurality of first windows 211. In this embodiment, the first plate 21 has four first windows 211. The first windows 211 are arranged in the circumferential direction. Each of the first windows 211 is disposed at a position overlapping with the elastic member accommodating portion 121a of the first rotating body 1 when viewed in the axial direction.

[0031] The first plate 21 has a restricting portion 212. The restricting portion 212 extends in the axial direction by bending the outer circumferential portion of the first plate 21 toward the second axial side. In this embodiment, the first plate 21 has four restricting portions 212. The stopper portion 122 is disposed between adjacent restricting portions 212 in the circumferential direction. The stopper portion 122 is disposed so as to be able to come into contact with the restricting portion 122 when the first rotating body 1 rotates relative to the second rotating body 2. That is, the first rotating body 1 is prohibited from rotating relative to the second rotating body 2 by the abutment of the stopper portion 22 with the restricting portion 122.

[0032] The first plate 21 has a fastening portion 213. The fastening portion 213 is formed by bending a tip of the restricting portion 212 radially outward. A fastening member 101 is disposed in the fastening portion 213. That is, the first plate 21 is fastened to the second plate 22 at the fastening portion 213.

[0033] The second plate 22 has a plurality of second window portions 221. In this embodiment, the second plate 22 has four second window portions 221. The second window portions 221 are arranged in the circumferential direction. The second window portions 221 are arranged at positions overlapping with the first window portions 211 when viewed in the axial direction. Also, the second window portions 221 are arranged at positions overlapping with the elastic member accommodating portions 121a of the first rotating body 1 when viewed in the axial direction.

[0034] The second plate 22 has a first engagement hole 222. The first engagement hole 222 penetrates the second plate 22 in the axial direction. The first engagement hole 222 is formed on the inner side of the second window portion 221 in the radial direction.

[0035] [Elastic member] The elastic members 3 are configured to elastically connect the first rotating body 1 and the second rotating body 2 in the rotational direction. The elastic members 3 are arranged in the circumferential direction. In this embodiment, the damper device 100 has four elastic members 3. The elastic members 3 are, for example, coil springs.

[0036] The elastic member 3 is accommodated in the elastic member accommodating portion 121a of the first rotating body 1. The elastic member 3 is accommodated in the first window portion 211 of the first plate 21 and also in the second window portion 221 of the second plate 22.

[0037] [First and second friction plates] The first friction plate 41 and the second friction plate 42 are both annular members having a central hole. The hub portion 11 of the first rotating body 1 extends through the central holes of the first friction plate 41 and the second friction plate 42.

[0038] The first friction plate 41 is disposed between the flange portion 12 of the first rotating body 1 and the second plate 22 in the axial direction. The first friction plate 41 is rotatable relative to the first rotating body 1, the second rotating body 2, and the second friction plate 42.

[0039] Fig. 4 is a plan view of the first friction plate 41. As shown in Fig. 4, the first friction plate 41 has a friction portion 411 and a protruding portion 412. The friction portion 411 is disposed between the first biasing member 61 and the second bush 52 in the axial direction. The friction portion 411 is disposed so as to be rotatable relative to the second bush 52. The friction portion 411 is slidable with respect to the second bush 52.

[0040] The friction portion 411 has recesses 411a. The recesses 411a are recessed radially inward from the outer circumferential surface of the friction portion 411. In this embodiment, the friction portion 411 has four recesses 411a.

[0041] The friction portion 411 has a protruding portion 411b. The protruding portion 411b is disposed within the recessed portion 411a. The protruding portion 411b protrudes radially outward from a surface that faces radially outward among the surfaces that define the recessed portion 411a. The protruding portion 411b is entirely housed within the recessed portion 411.

[0042] The protruding portion 412 extends radially outward from the friction portion 411. In this embodiment, the first friction plate 41 has two protruding portions 412. The protruding portion 412 is disposed between a pair of elastic members 3 adjacent in the circumferential direction. In a neutral state, a surface of the protruding portion 412 facing the R1 side abuts against an end face on the R2 side of the circumferentially adjacent elastic member 3. In a neutral state, a surface of the protruding portion 412 facing the R2 side abuts against an end face on the R1 side of the circumferentially adjacent elastic member 3.

[0043] The first friction plate 41 has second engagement holes 413. The second engagement holes 413 are recessed radially outward from the inner circumferential surface of the first friction plate 41. In this embodiment, the first friction plate 41 has four second engagement holes 413.

[0044] The second friction plate 42 is disposed between the third bush 53 and the fourth bush 54 in the axial direction. The second friction plate 42 is disposed so as to be rotatable relative to the third and fourth bushes 53, 54. The second friction plate 42 is slidable with respect to the third and fourth bushes 53, 54.

[0045] 2, the second friction plate 42 has a restricting protrusion 421. The restricting protrusion 421 extends in the axial direction by bending an outer circumferential portion of the second friction plate 42 toward the first axial side. The restricting protrusion 421 is disposed within the locking hole 123. The restricting protrusion 421 is disposed with a gap in the circumferential direction from a pair of surfaces of the inner wall surfaces that define the locking hole 123 and face in the circumferential direction.

[0046] When the first rotating body 1 is twisted toward the R1 side or the R2 side relative to the second rotating body 2, one of a pair of faces defining the locking hole 123 comes into contact with the restricting protrusion 421 in the circumferential direction. After the contact, the second friction plate 42 rotates integrally with the first rotating body 1.

[0047] [Bush] The first to fourth bushings 51 to 54 slide against the adjacent components to generate hysteresis torque.

[0048] The first bushing 51 is disposed so as to be rotatable relative to the first rotating body 1, the second rotating body 2, and the second friction plate 42. As shown in FIG. 3, the first bushing 51 has a main body portion 511, an extension portion 512, an engagement portion 513, a through hole 514, and a cylindrical portion 515.

[0049] The main body portion 511 has a central hole. The hub portion 11 extends through the central hole of the main body portion 511. The main body portion 511 is disposed between the flange portion 12 and the first plate 21 of the first rotating body 1 in the axial direction. The main body portion 511 is disposed so as to be rotatable relative to the flange portion 12 and the first plate 21. The main body portion 511 is slidable with respect to the first plate 21 and the flange portion 12.

[0050] The extension portion 512 extends from the main body portion 511 to the second axial side. Fig. 5 is an enlarged view of the extension portion 512 of the first bushing 51. As shown in Fig. 5, the extension portion 512 has a base portion 512a and a protrusion portion 512b. The base portion 512a extends from the main body portion 511 to the second axial side. The base portion 512a passes through the cutout 121b of the first rotating body 1 and extends to the second axial side.

[0051] The base portion 512a has a gap on the R1 side with respect to the surface of the notch 121b facing the R2 side. The gap between the base portion 512a and the surface of the notch 121b facing the R2 side is larger than the gap between the surface of the stopper portion 122 of the first rotating body 1 facing the R2 side and the surface of the restricting portion 122 of the first plate 21 facing the R1 side. Therefore, even if the first rotating body 1 is twisted toward the R2 side relative to the second rotating body 2, the base portion 512a does not come into contact with the surface of the notch 121b facing the R2 side.

[0052] On the other hand, the base portion 512a is in contact with the surface of the notch 121b facing the R1 side on the R2 side. Therefore, when the first rotating body 1 is twisted toward the R1 side relative to the second rotating body 2, the first bush 51 rotates integrally with the first rotating body 1. In addition, the second friction plate 42 rotates integrally with the first rotating body 1.

[0053] The base portion 512a has a contact surface 512a1. The contact surface 512a1 faces the second axial direction side. The contact surface 512a1 contacts the surface of the first friction plate 41 on the first axial direction side.

[0054] The protrusion 512b extends from the base portion 512a to the second axial side. In detail, the protrusion 512b extends from the tip surface of the base portion 512a to the second axial side. The tip surface of the base portion 512a is the end surface of the base portion 512a on the second axial side. The surface of the tip surface of the base portion 512a on which the protrusion 512b is not formed is the contact surface 512a1. The protrusion 512b engages with the recess 411a of the first friction plate 41.

[0055] The protrusion 512b has a first support portion 512b1 and a second support portion 512b2. The first support portion 512b1 and the second support portion 512b2 extend from the base portion 512a to a second side in the axial direction.

[0056] The surface of the first support portion 512b1 facing the R1 side abuts against the surface facing the R2 side of the inner wall surface that defines the recess 411a of the first friction plate 41. The surface of the first support portion 512b1 facing inward in the radial direction abuts against the surface facing outward in the radial direction of the inner wall surface that defines the recess 411a. The surface of the second support portion 512b2 facing the R2 side abuts against the surface facing the R1 side of the inner wall surface that defines the recess 411a. That is, the first bush 51 supports the first friction plate 41 by the protrusion portion 512b. Therefore, the first bush 51 rotates integrally with the first friction plate 41.

[0057] The surface of the first support portion 512b1 facing the second axial direction, i.e., the tip surface 512b5 of the first support portion 512b1, is positioned on the first axial side of the surface of the second support portion 512b2 facing the second side, i.e., the tip surface 512b6 of the second support portion 512b2.

[0058] The second support portion 512b2 has an avoidance surface 512b3 and an inward surface 512b4. The avoidance surface 512b3 faces inward in the radial direction. When viewed in the axial direction, the avoidance surface 512b3 has an arc shape centered on the rotation axis. The avoidance surface 512b3 faces the outer circumferential surface of a second bushing, which will be described later. The inward surface 512b4 faces the surface of the first support portion 512b1 facing the R2 side.

[0059] Fig. 6 is a partial enlarged view of the first friction plate 41 and the first bush 51. As shown in Fig. 6, a tip surface 512b5 of the first support portion 512b1 is disposed on the first axial side of the surface of the first friction plate 41 facing the second axial side.

[0060] The protruding portion 411b of the first friction plate 41 is disposed between the first support portion 512b1 and the inward surface 512b4 in the circumferential direction. The surface of the first support portion 512b1 facing the R2 side is disposed with a gap from the surface of the protruding portion 411b facing the R1 side. The inward surface 512b4 is disposed with a gap from the surface of the protruding portion 411b facing the R2 side.

[0061] As shown in FIG. 3, the engagement portion 513 is disposed on the second axial side with respect to the first friction plate 41. The engagement portion 513 extends radially inward from the extension portion 512. As shown in FIG. 5 and FIG. 6, the engagement portion 513 extends radially inward from the protrusion portion 512b, specifically, from the second support portion 512b2. The engagement portion 513 engages with the convex portion 411b. That is, the first bush 51 prohibits the first friction plate 41 from moving toward the second axial side by the engagement portion 513.

[0062] Fig. 7 is an enlarged cross-sectional view of the first bushing 51. As shown in Fig. 7, the through hole 514 extends in the axial direction through the first bushing 51. Specifically, the through hole 514 penetrates the main body portion 511 and the extension portion 512 in the axial direction. The through hole 514 overlaps with the engagement portion 513 when viewed in the axial direction. When viewed from the first axial side, the engagement portion 513 is exposed through the through hole 514.

[0063] The through hole 514 has a first through portion 514a and a second through portion 514b. The second through portion 514b is disposed on a second axial side relative to the first through portion 514a. The second through portion 514b has a smaller area in the axial direction than the first through portion 514a.

[0064] Fig. 8 is a cross-sectional view taken along line VIII-VIII in Fig. 7. As shown in Fig. 8, the first penetrating portion 514a has a shape that combines a rectangular shape and a semicircular shape when viewed in the axial direction. That is, the first penetrating portion 514a has a semicircular portion 514c that is semicircular when viewed in the axial direction, and a rectangular portion 514d that is rectangular when viewed in the axial direction. The semicircular portion 514c is disposed radially outward from the rectangular portion 514d.

[0065] Fig. 9 is a cross-sectional view taken along line IX-IX in Fig. 7. As shown in Fig. 9, the second penetrating portion 514b has a rectangular shape when viewed in the axial direction. The second penetrating portion 514b overlaps with the rectangular portion 514d when viewed in the axial direction.

[0066] 3, the cylindrical portion 515 extends from the main body portion 511 toward the second axial side. The hub portion 11 penetrates the inner periphery of the cylindrical portion 515. The cylindrical portion 515 penetrates the center hole of the first plate 21. That is, the cylindrical portion 515 is disposed between the hub portion 11 and the first plate 21 in the radial direction.

[0067] The second bush 52 is disposed between the second plate 22 of the second rotating body 2 and the first friction plate 41 in the axial direction. The second bush 52 has a central hole. The hub portion 11 extends through the central hole of the second bush 52.

[0068] The second bush 52 is disposed so as to be rotatable relative to the first rotating body 1, the first friction plate 41, and the second friction plate 42. The second bush 52 is slidable against the friction portion 411 of the first friction plate 41.

[0069] 2, the second bushing 52 has a first engagement protrusion 521. The first engagement protrusion 521 extends from the second bushing 52 toward the second axial side. The first engagement protrusion 521 engages with the first engagement hole 222 of the second plate 22. That is, the second bushing 52 rotates integrally with the second plate 22.

[0070] The third bush 53 is disposed axially between the flange portion 12 of the first rotating body 1 and the second friction plate 42. The third bush 53 has a central hole. The hub portion 11 extends through the central hole of the third bush 53.

[0071] The third bush 53 is disposed so as to be rotatable relative to the first rotating body 1, the second rotating body 2, and the second friction plate . The third bush 53 is slidable with the friction portion 411 and the second friction plate .

[0072] The third bushing 53 has a second engagement protrusion 531. The second engagement protrusion 531 passes through a central hole of the second friction plate 42 and engages with the second engagement hole 413 of the first friction plate 41. That is, the third bushing 53 rotates integrally with the first friction plate 41.

[0073] The fourth bush 54 is disposed axially between the second friction plate 42 and a first biasing member 61 (described later). The fourth bush 54 has a central hole. The hub portion 11 extends through the central hole of the fourth bush 54.

[0074] The fourth bush is disposed so as to be rotatable relative to the first rotating body 1, the second rotating body 2, and the second friction plate . The fourth bush is slidable relative to the second friction plate .

[0075] The fourth bush 54 has a third engagement hole 541. The third engagement hole 541 is recessed radially outward from the inner circumferential surface of the fourth bush 54. The third engagement hole 541 is engaged with the second engagement protrusion 531 of the third bush 53. That is, the fourth bush 54 rotates integrally with the third bush 53. In addition, the fourth bush 54 rotates integrally with the first friction plate 41.

[0076] [First and second biasing members] The first biasing member 61 is disposed between the first friction plate 41 and the fourth bush 54 in the axial direction. An inner peripheral end of the first biasing member 61 abuts against the first friction plate 41. An outer peripheral end of the first biasing member 61 abuts against the fourth bush 54. The first biasing member 61 biases the first friction plate 41 toward the second side in the axial direction. That is, the first biasing member 61 biases the first friction plate 41 toward the second bush 52. The first biasing member 61 is, for example, a disc spring.

[0077] The second biasing member 62 is disposed between the second plate 22 and the second bush 52 of the second rotating body 2 in the axial direction. An inner peripheral end of the second biasing member 62 abuts against the second plate 22. An outer peripheral end of the second biasing member 62 abuts against the second bush 52. The second biasing member 62 biases the second bush 52 toward the first side in the axial direction. That is, the second biasing member 62 biases the second bush 52 toward the first friction plate 41. The second biasing member 62 is, for example, a disc spring.

[0078] [Variations] The present invention is not limited to the above-described embodiments, and various modifications and alterations are possible without departing from the scope of the present invention.

[0079] (a) The damper device 100 does not have to have the second friction plate 42 and the fourth bush 54. In this case, the first biasing member 61 is disposed between the third bush 53 and the first friction plate 41.

[0080] (b) In the above embodiment, the extension portion 512 has the base portion 512a and the protrusion portion 512b, but the configuration of the extension portion 512 is not limited to this. For example, the extension portion 512 may have only the base portion 512a and not have the protrusion portion 512b. In this case, the engagement portion 513 extends radially inward from the base portion 512a. Also, the extension portion 512 may have only the protrusion portion 512b and not have the base portion 512a. In this case, the protrusion portion 512b extends from the main body portion 511 to the second axial side.

[0081] In the above embodiment, the first friction plate 41 has four recesses 411a, but the number of recesses 411a is not limited to this. Also, the first bush 51 has four extensions 512, but the number of extensions 512 is not limited to this. [Explanation of symbols]

[0082] 1: First rotating body 12: Flange part 2: Second rotating body 21: First plate 22: Second plate 3: Elastic material 41: First friction plate 411: Friction part 411a : Recess 412:Protrusion 51: First Bush 511: Main body 512: Extension part 512a: Base part 512a1: Contact surface 512b:Protrusion 512b1: 1st support part 512b2: Second support part 512b3: Evasion side 513: Engagement part 514:Through hole 514a: 1st penetration part 514b: 2nd penetration part 52: 2nd Bush 61: First biasing member 100: Damper device

Claims

1. a first rotating body having a flange portion; a second rotor having a first plate disposed on a first axial side of the flange portion and a second plate disposed on a second axial side of the flange portion; an elastic member that elastically connects the first rotating body and the second rotating body; a friction plate disposed between the flange portion and the second plate in the axial direction; a biasing member that biases the friction plate toward a second axial direction; a first bushing including: a main body portion disposed between the flange portion and the first plate in the axial direction; an extension portion extending from the main body portion to a second side in the axial direction; and an engagement portion disposed on the second side in the axial direction with respect to the friction plate and extending radially inward from the extension portion; A damper device comprising:

2. The extension portion is a base portion having an abutment surface that abuts against the friction plate and extending from the main body portion to a second axial direction; a protrusion extending from the base portion to a second axial direction; having The damper device according to claim 1 .

3. The first bushing has a through hole extending in the axial direction, The through hole overlaps with the engaging portion when viewed in the axial direction. The damper device according to claim 1 .

4. The through hole is A first penetration portion; A second through portion that is arranged on a second axial side relative to the first through portion and has a smaller area in the axial view than the first through portion; having The damper device according to claim 3 .

5. The second penetrating portion has a rectangular shape when viewed in the axial direction, The first through-hole has a shape that is a combination of a rectangular shape and a semicircular shape when viewed in the axial direction. The damper device according to claim 4.

6. The protrusion is a first support portion extending from the base portion toward a second side in the axial direction; a second support portion extending from the base portion to a second side in the axial direction, a surface of the first support portion facing the second axial direction is disposed closer to the first axial direction than a surface of the second support portion facing the second axial direction; The damper device according to claim 2 .

7. a surface of the first support portion facing the second axial direction is disposed on the first axial side relative to a surface of the friction plate facing the second axial direction; The damper device according to claim 6.

8. a second bushing that is disposed between the friction plate and the second plate in the axial direction and configured to rotate integrally with the second plate; the second support portion has an avoidance surface facing radially inward, The avoidance surface has an arc shape centered on the rotation axis when viewed in the axial direction, and faces an outer peripheral surface of the second bush. The damper device according to claim 6.

9. a second bushing that is disposed between the friction plate and the second plate in the axial direction and configured to rotate integrally with the second plate; the elastic member includes a plurality of elastic members arranged in a circumferential direction, The friction plate is a friction portion slidable with the second bush; a protrusion extending radially outward from the friction portion and disposed between the plurality of elastic members in the circumferential direction; and The friction portion has a recess recessed radially inward from an outer circumferential surface of the friction portion, The protrusion engages with the recess. The damper device according to claim 2 .

10. The friction portion has a protrusion that is disposed within the recess and protrudes radially outward, The engaging portion engages with the protruding portion. The damper device according to claim 9.

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