Power transmission device

Abstract

The invention relates to a power transmission device. The power transmission device stably generates friction force. The first friction plate is disposed between the first rotating body and the second rotating body in the axial direction. The first friction plate has an outer sliding portion and an inner sliding portion. The outer sliding portion is disposed radially outward of the elastic member. The outer sliding portion generates a frictional force when rotating relative to the second rotating body. The inner sliding portion is disposed radially inward of the elastic member. The inner sliding part generates friction force when rotating relative to the first rotating body.

Description

Technical Field

[0001] This invention relates to a power transmission device. Background Technology

[0002] Vibration damping devices, as an example of power transmission devices, are designed to absorb vibrations from prime movers such as internal combustion engines. The power transmission device in Patent Document 1 absorbs vibrations via a torsion spring and suppresses resonance through friction generated by the sliding of a friction plate against a friction component.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2019-203580 Summary of the Invention

[0004] The technical problem of the present invention is to provide a power transmission device capable of stably generating frictional force.

[0005] The power transmission device according to the first aspect includes a first rotating body, a second rotating body, an elastic member, and a first friction plate. The second rotating body is configured to rotate relative to the first rotating body. The elastic member elastically connects the first rotating body and the second rotating body. The first friction plate is axially disposed between the first rotating body and the second rotating body. The first friction plate has an outer sliding portion and an inner sliding portion. The outer sliding portion is disposed radially outward relative to the elastic member. The outer sliding portion generates friction when rotating relative to the second rotating body. The inner sliding portion is disposed radially inward relative to the elastic member. The inner sliding portion generates friction when rotating relative to the first rotating body.

[0006] According to this configuration, when the first friction plate rotates relative to the first rotating body, friction is generated through the inner sliding portion; on the other hand, when the first friction plate rotates relative to the second rotating body, friction is generated through the outer sliding portion. The outer sliding portion is positioned radially outward relative to the elastic member, thus increasing the friction surface used to generate this friction force and enabling stable generation of friction.

[0007] The power transmission device according to the second aspect is configured in the power transmission device according to the first aspect as described below. The second rotating body has a first plate and a second plate. The first plate is disposed on a first side in the axial direction relative to the first rotating body. The second plate is disposed on a second side in the axial direction relative to the first rotating body. The second plate is configured to rotate integrally with the first plate. A first friction plate is disposed axially between the first plate and the first rotating body.

[0008] The power transmission device involved in the third aspect further includes a side plate, a pressure plate, and a second friction plate in the power transmission device involved in the second aspect. The second friction plate is mounted on the second plate. The second friction plate is clamped in the axial direction by the side plate and the pressure plate.

[0009] The power transmission device according to the fourth aspect also includes a force-applying component in the power transmission device according to the second or third aspect. The force-applying component is axially disposed between the first rotating body and the second plate. The force-applying component applies force in a manner that causes the first rotating body and the second plate to separate from each other axially.

[0010] The power transmission device according to the fifth aspect further includes a friction component in the power transmission device according to the fourth aspect. The friction component is axially disposed between the first rotating body and the force-applying component. The friction component is configured to rotate integrally with the second plate.

[0011] The power transmission device according to the sixth aspect further includes a friction component in the power transmission device according to any one of the first to fifth aspects. The friction component is disposed between the inner sliding portion of the first friction plate and the first rotating body.

[0012] The power transmission device according to the seventh aspect further includes a first constraint mechanism in the power transmission device according to any one of the first to sixth aspects. The first constraint mechanism is configured to constrain the range of the relative rotation angle between the first friction plate and the first rotating body.

[0013] The power transmission device according to the eighth aspect is configured as described in the power transmission device according to the seventh aspect as follows: A first rotating body has a first window extending in the circumferential direction. A second rotating body has a second window extending in the circumferential direction. An elastic member is disposed within the first and second windows. A first restraint mechanism is disposed radially outward relative to the inner periphery of the first window.

[0014] The power transmission device according to the ninth aspect is configured as described in the power transmission devices according to any one of the first to eighth aspects. A first rotating body has a hub and a flange plate. The hub extends axially. The flange plate is a separate component from the hub. The flange plate is configured to rotate integrally with the hub.

[0015] Invention Effects

[0016] According to the present invention, frictional force can be generated stably. Attached Figure Description

[0017] Figure 1 This is the front view of the power transmission device.

[0018] Figure 2 yes Figure 1 Sectional view of line II-II.

[0019] Figure 3 This is the front view of the first friction plate.

[0020] Figure 4 This is a front view of the power transmission device that extracts the first friction plate and the output rotating body.

[0021] Figure 5 yes Figure 4 VV-line cross-sectional diagram.

[0022] Figure 6 This is a graph showing the torque characteristics. Detailed Implementation

[0023] The power transmission device 100 according to this embodiment will now be described with reference to the accompanying drawings. It should be noted that in the following description, axial direction refers to the direction in which the rotation axis O of the power transmission device 100 extends. Furthermore, circumferential direction refers to the circumferential direction of the circle centered on the rotation axis O, and radial direction refers to the radial direction of the circle centered on the rotation axis O. Additionally, axial first side means... Figure 2 The right side, the second side of the axis, means Figure 2 On the left side.

[0024] Figure 1 This is the front view of the power transmission device 100. Figure 2 yes Figure 1 The cross-sectional view along line II-II. (See diagram below.) Figure 1 and Figure 2 As shown, the power transmission device 100 includes a torque limiter unit 3, a vibration damping unit 4, and a first fastening member 5. The torque limiter unit 3 and the vibration damping unit 4 rotate substantially integrally with each other. The power transmission device 100 is disposed between an internal combustion engine (not shown) and an output-side component (not shown). It should be noted that the output-side component is, for example, an electric motor or a transmission. The power transmission device 100 is mounted on a flywheel (not shown). For example, in... Figure 2 In this configuration, the internal combustion engine is located on the left side of the power transmission device 100, and the output-side components are located on the right side of the power transmission device 100. The power transmission device 100 is configured to limit the torque transmitted between the internal combustion engine and the output-side components, and to attenuate torque fluctuations.

[0025] [Vibration Damping Unit]

[0026] The vibration damping unit 4 is mounted to the torque limiter unit 3 via the first fastening member 5. The vibration damping unit 4 is configured to attenuate rotational fluctuations. The vibration damping unit 4 has an input rotating body 41 (an example of a second rotating body), an output rotating body 42 (an example of a first rotating body), a plurality of elastic members 43, a first friction plate 44, a plurality of first constraint mechanisms 45, a plurality of second constraint mechanisms 46, a first friction member 47, a force-applying member 48, and a second friction member 49.

[0027] <Input Rotation Solid>

[0028] The input rotating body 41 rotates integrally with the second friction plate 33 of the torque limiter unit 3, which will be described later. The input rotating body 41 is configured to rotate relative to the output rotating body 42.

[0029] The input rotating body 41 has a first plate 41a and a second plate 41b. Both the first plate 41a and the second plate 41b are annular components with a central hole. The first plate 41a and the second plate 41b rotate integrally with each other. Furthermore, the first plate 41a and the second plate 41b cannot move relative to each other in the axial direction.

[0030] The first plate 41a and the second plate 41b are arranged axially spaced apart from each other. The first plate 41a is arranged on the first side of the axial direction relative to the second plate 41b.

[0031] The first plate 41a and the second plate 41b each have a plurality of second windows 411a and 411b. It should be noted that, in this embodiment, the first plate 41a and the second plate 41b each have four second windows 411a and 411b, but their number is not limited to this.

[0032] Each of the second windows 411a and 411b extends in the circumferential direction. Each of the second windows 411a and 411b is arranged spaced apart from each other in the circumferential direction. Each of the second windows 411a and 411b is configured to accommodate the elastic member 43.

[0033] The input rotating body 41 also has a plurality of second fastening components 41c. The second fastening components 41c fasten the first plate 41a and the second plate 41b to the outer periphery of the first plate 41a and the second plate 41b.

[0034] The second fastening member 41c is disposed on a first side in the axial direction relative to the first side plate 31, which will be described later. When viewed in the axial direction, the second fastening member 41c overlaps with the first side plate 31. The second fastening member 41c is, for example, a rivet.

[0035] <Output Rotational Body>

[0036] The output rotating body 42 is configured to transmit torque from the input rotating body 41 to the output side component. The output rotating body 42 is axially disposed between the first plate 41a and the second plate 41b. The output rotating body 42 is configured to be rotatable relative to the first plate 41a and the second plate 41b.

[0037] The output rotating body 42 has a hub 421 and a flange plate 422. The hub 421 and the flange plate 422 are configured as separate components, but they can also be formed as a single integral component. The hub 421 and the flange plate 422 rotate integrally.

[0038] The hub 421 is cylindrical and is disposed within the central holes of the first plate 41a and the second plate 41b. The hub 421 extends axially. An axially extending spline hole is formed on the inner circumference of the hub 421. The input shaft of the output-side component can engage with the spline hole spline.

[0039] Flange plate 422 extends radially from the outer peripheral surface of hub 421. Flange plate 422 is formed in an annular shape.

[0040] The flange plate 422 is configured to rotate relative to the first plate 41a and the second plate 41b. The flange plate 422 is axially disposed between the first plate 41a and the second plate 41b. The first plate 41a is disposed on a first side of the axial direction relative to the flange plate 422. The second plate 41b is disposed on a second side of the axial direction relative to the flange plate 422.

[0041] The flange plate 422 has a plurality of first windows 423. Each first window 423 extends in the circumferential direction. It should be noted that in this embodiment, the flange plate 422 has four first windows 423, but the number is not limited to this. The first windows 423 are arranged spaced apart from each other in the circumferential direction. Each first window 423 is configured to accommodate the elastic member 43. When viewed in the axial direction, each first window 423 is arranged to overlap with each second window 411a, 411b.

[0042] <Elastic Components>

[0043] 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 has, for example, a helical spring 431 and a pair of spring seats 432. The helical spring 431 is clamped between the pair of spring seats 432 in the circumferential direction.

[0044] The elastic member 43 is housed in the first window 423 of the output rotator 42. In addition, the elastic member 43 is housed in the second window 411a of the first plate 41a, and also in the second window 411b of the second plate 41b.

[0045] <First Friction Plate>

[0046] A first friction plate 44 is axially disposed between an input rotating body 41 and an output rotating body 42. More specifically, the first friction plate 44 is axially disposed between a first plate 41a and a flange plate 422. The first friction plate 44 is configured to rotate relative to both the input rotating body 41 and the output rotating body 42.

[0047] Figure 3 This is the front view of the first friction plate 44. (See image below.) Figure 2 and Figure 3 As shown, the first friction plate 44 has multiple receiving holes 441, an outer sliding part 442, and an inner sliding part 443.

[0048] The first friction plate 44 is annular. That is, the first friction plate 44 has an opening 444 in the center. The hub 421 passes through the opening 444 of the first friction plate 44 in the axial direction.

[0049] Each receiving hole 441 extends in the circumferential direction. It should be noted that in this embodiment, the first friction plate 44 has four receiving holes 441, but the number is not limited to this. The receiving holes 441 are spaced apart from each other in the circumferential direction. Each receiving hole 441 is configured to receive an elastic member 43. When viewed in the axial direction, each receiving hole 441 is configured to overlap with each first window portion 423 and each second window portion 411a, 411b.

[0050] The outer sliding portion 442 is formed by the outer periphery of the first friction plate 44. The outer sliding portion 442 is annular in shape extending in the circumferential direction. The outer sliding portion 442 is located on a first side that is more axially closer than the other parts of the first friction plate 44.

[0051] The outer sliding portion 442 abuts against the first plate 41a. The portion of the first friction plate 44 other than the outer sliding portion 442 is axially spaced from the first plate 41a. It should be noted that the portion of the first friction plate 44 other than the outer sliding portion 442 may also abut against the first plate 41a. The outer sliding portion 442 does not abut against the flange plate 422. That is, the outer sliding portion 442 is axially spaced from the flange plate 422.

[0052] The outer sliding portion 442 is disposed radially outward relative to the elastic member 43. The outer sliding portion 442 is disposed radially outward relative to each receiving hole 441. The outer sliding portion 442 generates frictional force when the first friction plate 44 rotates relative to the input rotating body 41. Specifically, when the first friction plate 44 rotates relative to the first plate 41a, the outer sliding portion 442 generates frictional force by sliding with the first plate 41a.

[0053] The inner sliding portion 443 is formed by the inner periphery of the first friction plate 44. The inner sliding portion 443 is annular in shape extending in the circumferential direction. The inner sliding portion 443 does not abut against the first plate 41a. That is, the inner sliding portion 443 is spaced apart from the first plate 41a in the axial direction. The inner sliding portion 443 is also spaced apart from the flange plate 422 in the axial direction. The inner sliding portion 443 does not directly abut against the flange plate 422, but indirectly abuts against it. Specifically, the inner sliding portion 443 abuts against the flange plate 422 through the second friction member 49.

[0054] The inner sliding portion 443 is disposed radially inward relative to the elastic member 43. The inner sliding portion 443 is disposed radially inward relative to each receiving hole 441. The inner sliding portion 443 generates frictional force when the first friction plate 44 rotates relative to the output rotating body 42. Specifically, when the first friction plate 44 rotates relative to the flange plate 422, frictional force is generated by the inner sliding portion 443 sliding with the second friction member 49, or by the inner sliding portion 443 rotating integrally with the second friction member 49 while the second friction member 49 slides with the flange plate 422.

[0055] The first friction plate 44 has a plurality of abutment portions 445. Each abutment portion 445 is radially disposed between the outer sliding portion 442 and the inner sliding portion 443. Each abutment portion 445 is circumferentially disposed between an adjacent pair of receiving holes 441.

[0056] Each abutting portion 445 is disposed circumferentially between an adjacent pair of elastic members 43. Each abutting portion 445 abuts against the adjacent pair of elastic members 43 in the circumferential direction. That is, each abutting portion 445 is sandwiched between a pair of elastic members 43.

[0057] <First Restraint Mechanism>

[0058] Figure 4 This is a front view of the power transmission device 100, which only extracts the output rotating body 42 and the first friction plate 44. Figure 5 yes Figure 4 A cross-sectional diagram of the VV line. (See diagram below.) Figure 4 and Figure 5 As shown, the first constraint mechanism 45 is configured to constrain the range of the relative rotation angle between the first friction plate 44 and the output rotating body 42. Therefore, the first friction plate 44 can only rotate relative to the output rotating body 42 within a certain angular range. That is, the first friction plate 44 cannot rotate relative to the output rotating body 42 beyond a certain angular range.

[0059] When the first constraint mechanism 45 is not activated, that is, when the torsion angle between the input rotating body 41 and the output rotating body 42 is within the angle range constrained by the first constraint mechanism 45, the first friction plate 44 rotates integrally with the input rotating body 41 and rotates relative to the output rotating body 42. Furthermore, when the first constraint mechanism 45 is activated, that is, when the torsion angle between the input rotating body 41 and the output rotating body 42 reaches the upper or lower limit of the angle range constrained by the first constraint mechanism 45, the first friction plate 44 rotates integrally with the output rotating body 42 and rotates relative to the input rotating body 41. It should be noted that in this embodiment, the power transmission device 100 has four first constraint mechanisms 45, but the number is not limited to this.

[0060] Each first restraint mechanism 45 is arranged radially outward relative to the inner periphery 424 of the first window portion 423. Furthermore, each first restraint mechanism 45 is arranged radially outward relative to the outer periphery 425 of the first window portion 423. Each first restraint mechanism 45 is arranged radially outward relative to the first fastening member 5.

[0061] Each first restraint mechanism 45 has a first stop surface 451a, a second stop surface 451b, and a claw portion 452.

[0062] A first stop surface 451a and a second stop surface 451b are formed on the output rotating body 42. More specifically, the first stop surface 451a and the second stop surface 451b are formed on the flange plate 422. The first stop surface 451a and the second stop surface 451b are part of the flange plate 422. The first stop surface 451a and the second stop surface 451b are arranged on the same circumference.

[0063] The first stop surface 451a and the second stop surface 451b are arranged radially outward relative to the inner periphery 424 of the first window portion 423. Furthermore, the first stop surface 451a and the second stop surface 451b are arranged radially outward relative to the outer periphery 425 of the first window portion 423. The first stop surface 451a and the second stop surface 451b are arranged radially outward relative to the first fastening member 5.

[0064] The first stop surface 451a and the second stop surface 451b face circumferentially. The first stop surface 451a and the second stop surface 451b are formed opposite to each other. When the first friction plate 44 rotates relative to the output rotating body 42 in the forward rotation direction R, the first stop surface 451a abuts against the claw portion 452. When the first friction plate 44 rotates relative to the output rotating body 42 in the reverse rotation direction, the second stop surface 451b abuts against the claw portion 452. It should be noted that the direction in which the power transmission device 100 rotates when the vehicle equipped with the power transmission device 100 moves forward is defined as the forward rotation direction R, and its opposite rotation direction is defined as the reverse rotation direction.

[0065] A claw portion 452 is formed on the first friction plate 44. The claw portion 452 is a part of the first friction plate 44. The claw portion 452 extends axially from the outer sliding portion 442 of the first friction plate 44 toward the flange plate 422. The claw portion 452 is formed by bending a part of the first friction plate 44 toward a second axial side. It should be noted that a plurality of notches 446 are formed on the outer sliding portion 442 such that the claw portion 452 is sandwiched between the plurality of notches 446 in the circumferential direction.

[0066] The claw portion 452 is disposed radially outward relative to the inner peripheral edge 424 of the first window portion 423. Furthermore, the claw portion 452 is disposed radially outward relative to the outer peripheral edge 425 of the first window portion 423. The claw portion 452 is disposed radially outward relative to the first fastening member 5.

[0067] The claw portion 452 is circumferentially disposed between the first stop surface 451a and the second stop surface 451b. The claw portion 452 is circumferentially spaced from and opposite the first stop surface 451a and the second stop surface 451b. The claw portion 452 is disposed on the same circumference as the first stop surface 451a and the second stop surface 451b.

[0068] The distance between the claw portion 452 and the first stop surface 451a is different from the distance between the claw portion 452 and the second stop surface 451b. Specifically, the distance between the first friction plate 44 and the first stop surface 451a is greater than the distance between the first friction plate 44 and the second stop surface 451b.

[0069] <Second Restraint Mechanism>

[0070] like Figure 1 and Figure 2 As shown, each of the second constraint mechanisms 46 is configured to constrain the range of relative rotation angles between the input rotating body 41 and the output rotating body 42. It should be noted that the range of relative rotation angles between the input rotating body 41 and the output rotating body 42 constrained by each of the second constraint mechanisms 46 is greater than the range of relative rotation angles between the first friction plate 44 and the output rotating body 42 constrained by each of the first constraint mechanisms 45.

[0071] Each second constraint mechanism 46 is arranged radially outward relative to each first constraint mechanism 45. That is, each first constraint mechanism 45 is arranged radially inward relative to each second constraint mechanism 46.

[0072] Each second restraint mechanism 46 has multiple protrusions 461 and multiple stops 462. The protrusions 461 are formed on the output rotating body 42. The protrusions 461 are part of the output rotating body 42. The protrusions 461 protrude radially outward from the flange plate 422 of the output rotating body 42.

[0073] A stop portion 462 is formed on the input rotating body 41. The stop portion 462 is a part of the input rotating body 41. More specifically, the stop portion 462 is a part of the second plate 41b. The stop portion 462 is a portion of the second plate 41b that extends axially from the main body. The stop portion 462 is formed by bending a part of the second plate 41b axially.

[0074] In the circumferential direction, the stop portion 462 is disposed between a pair of adjacent protrusions 461 in the circumferential direction. The stop portion 462 and each protrusion 461 are spaced apart and opposite each other in the circumferential direction. That is, the stop portion 462 and each protrusion 461 are disposed on the same circumference.

[0075] <First Friction Component>

[0076] The first friction member 47 is configured to rotate integrally with the input rotating body 41. The first friction member 47 is axially disposed between the second plate 41b and the flange plate 422. More specifically, the first friction member 47 is axially disposed between the force-applying member 48 and the flange plate 422. The first friction member 47 is annular in shape extending circumferentially. The first friction member 47 has an annular main body portion 471 and an engaging portion 472 extending axially from the main body portion 471.

[0077] The main body 471 abuts against the flange plate 422. The main body 471 is axially positioned between the force-applying member 48 and the flange plate 422. Torque variation is reduced due to frictional attenuation caused by the sliding of the main body 471 and the flange plate 422. The engaging portion 472 engages with the second plate 41b of the input rotating body 41. Therefore, the first friction member 47 and the second plate 41b rotate integrally.

[0078] <Force-applying components>

[0079] The force-applying component 48 is axially disposed between the flange plate 422 and the second plate 41b. More specifically, the force-applying component 48 is axially disposed between the first friction component 47 and the second plate 41b. The force-applying component 48 applies force in a manner that axially separates the flange plate 422 and the second plate 41b from each other. The force-applying component 48 applies force to the first friction component 47 towards the flange plate 422. The force-applying component 48 is, for example, a disc spring.

[0080] <Second Friction Component>

[0081] The second friction member 49 is annular, extending circumferentially. The second friction member 49 is axially disposed between the inner sliding portion 443 of the first friction plate 44 and the flange plate 422. The second friction member 49 abuts against both the first friction plate 44 and the flange plate 422. The second friction member 49 is disposed radially inward relative to the elastic member 43. The second friction member 49 abuts against the inner sliding portion 443 of the first friction plate 44.

[0082] The second friction component 49 is capable of rotating relative to both the first friction plate 44 and the flange plate 422. When the input rotating body 41 and the output rotating body 42 rotate relative to each other, the component with the greater frictional resistance to the second friction component 49, the first friction plate 44, and the flange plate 422 rotates integrally. It should be noted that in this embodiment, the second friction component 49 rotates integrally with the flange plate 422, generating friction between the second friction component 49 and the first friction plate 44. The second friction component 49 can be configured to rotate integrally with the first friction plate 44 or integrally with the flange plate 422.

[0083] The frictional force generated between the second friction component 49 and the inner sliding portion 443 of the first friction plate 44, or the frictional force generated between the second friction component 49 and the flange plate 422, is less than the frictional force generated between the outer sliding portion 442 of the first friction plate 44 and the first plate 41a.

[0084] [Torque Limiter]

[0085] like Figure 2 As shown, the torque limiter unit 3 is configured to rotate about the rotation axis O. The torque limiter unit 3 is positioned on the second axial side relative to the vibration damping unit 4. The torque limiter unit 3 is annular. The torque limiter unit 3 is mounted to a flywheel, etc., by multiple bolts.

[0086] The torque limiter unit 3 is configured to limit the torque transmitted between the flywheel and the damping unit 4. That is, the torque limiter unit 3 is configured to restrict the transmission of torque exceeding a specified value in the power transmission device 100.

[0087] The torque limiter unit 3 has a first side plate 31 (an example of a side plate), a second side plate 32, a second friction plate 33, a first friction material 34a, a second friction material 34b, a pressure plate 35, and a disc spring 36.

[0088] <First side panel and second side panel>

[0089] A first side plate 31 and a second side plate 32 are mounted on a flywheel. The first side plate 31 and the second side plate 32 rotate integrally with the flywheel. The first side plate 31 and the second side plate 32 are annular. The second side plate 32 is axially spaced from the first side plate 31. The second side plate 32 is positioned on the second axial side relative to the first side plate 31. A second friction plate 33, a first friction material 34a, a second friction material 34b, a pressure plate 35, and a disc spring 36 are disposed between the first side plate 31 and the second side plate 32. The thickness of the second side plate 32 is thinner than that of the first side plate 31.

[0090] <Second Friction Plate>

[0091] The second friction plate 33 is an annular plate. The second friction plate 33 is configured to rotate about the rotation axis O. The second friction plate 33 is axially held by the first side plate 31 and the pressure plate 35. The second friction plate 33 is frictionally engaged with the first side plate 31 via the first friction material 34a. Furthermore, the second friction plate 33 is frictionally engaged with the pressure plate 35 via the second friction material 34b.

[0092] The second friction plate 33 is mounted on the input rotating body 41. Specifically, the second friction plate 33 is mounted on the second plate 41b. The second friction plate 33 is mounted on the second plate 41b by the first fastening member 5. The second friction plate 33 rotates integrally with the input rotating body 41.

[0093] <Friction Materials>

[0094] The first friction material 34a and the second friction material 34b are annular, extending in the circumferential direction. The first friction material 34a is disposed on a first side in the axial direction relative to the second friction plate 33. The second friction material 34b is disposed on a second side in the axial direction relative to the second friction plate 33. The first friction material 34a and the second friction material 34b are mounted on the second friction plate 33.

[0095] <Pressure plate>

[0096] The pressure plate 35 is annular, extending circumferentially. The pressure plate 35 is configured to press the second friction plate 33. The pressure plate 35 presses the second friction plate 33 via the second friction material 34b. The pressure plate 35 is axially positioned between the second friction material 34b and the disc spring 36.

[0097] The pressure plate 35 is configured to rotate integrally with the first side plate 31. Specifically, the pressure plate 35 has a plurality of engaging claws 351 that engage with the first side plate 31.

[0098] <Disc Spring>

[0099] A disc spring 36 is axially positioned between the second side plate 32 and the pressure plate 35. The disc spring 36 exerts a force on the pressure plate 35 towards the second friction plate 33. That is, the disc spring 36 exerts a force on the pressure plate 35 towards the first axial side. As a result, the second friction plate 33, the first friction material 34a, and the second friction material 34b are sandwiched between the pressure plate 35 and the first side plate 31.

[0100] <First Fastening Component>

[0101] The first fastening component 5 fastens the second friction plate 33 and the input rotating body 41. Specifically, the first fastening component 5 fastens the second friction plate 33 and the second plate 41b.

[0102] <Action>

[0103] Figure 6This is a graph showing the relationship between the torsional angle and the torsional torque. It should be noted that... Figure 6 In the diagram, the horizontal axis represents the torsional angle between the input rotating body 41 and the output rotating body 42, and the vertical axis represents the torsional torque loaded by the vibration damping unit 4.

[0104] like Figure 6 As shown, during the period when the torsion angle changes from 0 to θ1, the first constraint mechanism 45 is not in operation, that is, the claw 452 is not in contact with the first stop surface 451a. Therefore, the first friction plate 44 can rotate relative to the output rotating body 42 and rotate integrally with the input rotating body 41. Thus, frictional force is generated between the second friction member 49 and the inner sliding portion 443 of the first friction plate 44, and frictional force is generated between the first friction member 47 and the flange plate 422.

[0105] When the torsion angle becomes θ1, the first constraint mechanism 45 operates, that is, the claw portion 452 abuts against the first stop surface 451a. Therefore, during the period when the torsion angle changes from θ1 to θ2, the first friction plate 44 cannot rotate relative to the output rotating body 42, but rotates relative to the input rotating body 41. This generates friction between the first plate 41a and the outer sliding portion 442 of the first friction plate 44, as well as friction between the first friction component 47 and the flange plate 422. It should be noted that when the torsion angle becomes θ2, the second constraint mechanism 46 operates, that is, the stop portion 462 abuts against the protrusion 461, therefore, the input rotating body 41 cannot rotate relative to the output rotating body 42.

[0106] During the period when the torsion angle changes from θ2 to θ3, the input rotating body 41 rotates integrally with the first friction plate 44, thus generating friction between the second friction component 49 and the inner sliding portion 443 of the first friction plate 44, as well as friction between the first friction component 47 and the flange plate 422.

[0107] When the torsion angle becomes θ3, the abutting portion 445 of the first friction plate 44 abuts against the elastic member 43. Therefore, during the period when the torsion angle changes from θ3 to 0, the first friction plate 44 rotates relative to the input rotating body 41. As a result, frictional force is generated between the outer sliding portion 442 of the first friction plate 44 and the first plate 41a, as well as frictional force between the first friction member 47 and the flange plate 422.

[0108] When the torsion angle becomes 0, another elastic member 43 abuts against the abutment portion 445 of the first friction plate 44, and the abutment portion 445 is sandwiched between the pair of elastic members 43, and the power transmission device 100 returns to its initial state. During the period when the torsion angle changes from 0 to θ4, the first constraint mechanism 45 does not work, that is, the claw portion 452 does not abut against the second stop surface 451b. Therefore, the first friction plate 44 can rotate relative to the output rotating body 42 and rotate integrally with the input rotating body 41. Thus, frictional force is generated between the second friction member 49 and the inner sliding portion 443 of the first friction plate 44, and frictional force is generated between the first friction member 47 and the flange plate 422.

[0109] When the torsion angle becomes θ4, the first constraint mechanism 45 operates, that is, the claw portion 452 abuts against the second stop surface 451b. Therefore, during the period when the torsion angle changes from θ4 to θ5, the first friction plate 44 cannot rotate relative to the output rotating body 42, but rotates relative to the input rotating body 41. This generates friction between the outer sliding portion 442 of the first friction plate 44 and the first plate 41a, as well as friction between the first friction component 47 and the flange plate 422. It should be noted that when the torsion angle becomes θ5, the second constraint mechanism 46 operates, that is, the stop portion 462 abuts against the protrusion 461, therefore, the input rotating body 41 cannot rotate relative to the output rotating body 42.

[0110] During the period when the torsion angle changes from θ5 to θ6, the input rotating body 41 rotates integrally with the first friction plate 44, thus generating friction between the second friction component 49 and the inner sliding portion 443 of the first friction plate 44, as well as friction between the first friction component 47 and the flange plate 422.

[0111] When the torsion angle becomes θ6, the abutting portion 445 of the first friction plate 44 abuts against the elastic member 43. Therefore, during the period when the torsion angle changes from θ6 to 0, the first friction plate 44 rotates relative to the input rotating body 41. As a result, frictional force is generated between the outer sliding portion 442 of the first friction plate 44 and the first plate 41a, as well as frictional force between the first friction member 47 and the flange plate 422.

[0112] When the torsion angle becomes 0, another elastic member 43 comes into contact with the abutment portion 445 of the first friction plate 44, and the abutment portion 445 returns to the initial state of being sandwiched between a pair of elastic members 43.

[0113] [Variation Example]

[0114] The embodiments of the present invention have been described above, but the present invention is not limited thereto, and various modifications can be made without departing from the spirit of the present invention. It should be noted that the following modifications can be applied simultaneously.

[0115] (a) In the above embodiment, the output rotating body 42 is an example of a first rotating body, and the input rotating body 41 is an example of a second rotating body, but the configuration of the power transmission device 100 is not limited to this. For example, the output rotating body 42 may be an example of a second rotating body, and the input rotating body 41 may be an example of a first rotating body. That is, friction may be generated between the outer sliding portion 442 of the first friction plate 44 and the flange plate 422 of the output rotating body 42, and friction may be generated between the inner sliding portion 443 of the first friction plate 44 and the first plate 41a of the input rotating body 41.

[0116] (b) In the above embodiment, the first friction plate 44 is in direct contact with the first plate 41a, but other components may be located between the first friction plate 44 and the first plate 41a.

[0117] (c) In the above embodiment, the inner sliding portion 443 of the first friction plate 44 abuts against the flange plate 422 through the second friction member 49, but the inner sliding portion 443 can also directly contact the flange plate 422.

[0118] (d) In the above embodiment, the second friction plate 33 is mounted on the second plate 41b, but it can also be mounted on the first plate 41a.

[0119] (e) In the above embodiment, the first constraint mechanism 45 is arranged radially outward relative to the inner periphery 424 of the first window portion 423, but the first constraint mechanism 45 may also be arranged radially inward relative to the inner periphery 424 of the first window portion 423.

[0120] Explanation of reference numerals in the attached figures

[0121] 31: First side plate

[0122] 33: Second friction plate

[0123] 35: Pressure plate

[0124] 41: Input solid of revolution

[0125] 41a: First board

[0126] 411a: Second window

[0127] 41b: Second board

[0128] 411b: Second Window

[0129] 42: Output rotating body

[0130] 421: Wheel hub

[0131] 422: Flange plate

[0132] 423: First Window Section

[0133] 424: Inner perimeter

[0134] 43: Elastic component

[0135] 44: First friction plate

[0136] 442: Outer sliding part

[0137] 443: Inner sliding part

[0138] 45: First constraint mechanism

[0139] 47: First friction component

[0140] 48: Force-applying components

[0141] 100: Power transmission device.

Claims

1. A power transmission device, comprising: First body of revolution; The second rotating body is configured to rotate relative to the first rotating body; An elastic component elastically connects the first rotating body and the second rotating body; and A first friction plate is axially positioned between the first rotating body and the second rotating body. The first friction plate has: An outer sliding portion, disposed radially outward relative to the elastic member, generates frictional force when rotating relative to the second rotating body; and The inner sliding portion is disposed radially inside the elastic component and generates frictional force when rotating relative to the first rotating body.

2. The power transmission device according to claim 1, wherein, The second rotating body has: A first plate is disposed on a first side of the axial direction relative to the first rotating body; and The second plate is disposed on a second side of the axial direction relative to the first rotating body and is configured to rotate integrally with the first plate. The first friction plate is axially positioned between the first plate and the first rotating body.

3. The power transmission device according to claim 2, wherein, The power transmission device also includes: Side panels; Pressure plate; and The second friction plate is mounted on the second plate and is held axially by the side plate and the pressure plate.

4. The power transmission device according to claim 2, wherein, The power transmission device also includes a force-applying component, which is axially disposed between the first rotating body and the second plate. The force-applying component applies force in a manner that causes the first rotating body and the second plate to separate from each other axially.

5. The power transmission device according to claim 4, wherein, The power transmission device also includes a friction component, which is axially disposed between the first rotating body and the force-applying component and is configured to rotate integrally with the second plate.

6. The power transmission device according to claim 1, wherein, The power transmission device also includes a friction component, which is disposed between the inner sliding portion of the first friction plate and the first rotating body.

7. The power transmission device according to claim 1, wherein, The power transmission device also includes a first constraint mechanism, which is configured to constrain the range of the relative rotation angle between the first friction plate and the first rotating body.

8. The power transmission device according to claim 7, wherein, The first rotating body has a first window portion extending in the circumferential direction. The second rotating body has a second window extending in the circumferential direction. The elastic component is disposed within the first window portion and the second window portion. The first constraint mechanism is arranged radially outward relative to the inner periphery of the first window portion.

9. The power transmission device according to claim 1, wherein, The first rotating body has: The hub extends axially; and The flange plate is a separate component from the hub and is configured to rotate integrally with the hub.

Images