Power transmission device

Abstract

Reduces wear on the friction plates. [Solution] The power transmission device comprises a first rotating member, a second rotating member, an elastic member, a first friction plate, and a first regulating mechanism. The first rotating member has a first window portion extending in the circumferential direction. The second rotating member has a second window portion extending in the circumferential direction. The second rotating member is arranged to be rotatable relative to the first rotating member. The elastic member is arranged within the first and second window portions. The first friction plate is arranged between the first and second rotating members in the axial direction. The first friction plate is arranged to be rotatable relative to the first and second rotating members. The first regulating mechanism is arranged radially outward with respect to the inner circumferential edge of the first window portion. The first regulating mechanism is configured to restrict the range of relative rotation angles between the friction plate and the first rotating member.

Description

Technical Field

[0004] ,

[0006] , , , , , ,

[0005] , , , , ,

[0001] The present invention relates to a power transmission device.

Background Art

[0002] A damper device, which is an example of a power transmission device, is provided to absorb vibrations of a prime mover such as an internal combustion engine. The power transmission device of Patent Document 1 absorbs vibrations by a torsion spring and suppresses the occurrence of resonance by causing a friction plate to slide on a friction member.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0007] In this configuration, the first regulating mechanism, which restricts the range of relative rotation angles between the friction plate and the first rotating member, is positioned radially outward with respect to the inner periphery of the first window. Therefore, in the region radially inward with respect to the inner periphery of the first window, the friction plate does not need to form claws or notches for the first regulating mechanism. As a result, the friction plate can slide throughout the region radially inward with respect to the inner periphery of the first window, thereby reducing wear.

[0008] The power transmission device according to the second embodiment is configured as follows in the power transmission device according to the first embodiment. The first regulating mechanism has a stopper surface and a claw portion. The stopper surface is formed on the first rotating member. The stopper surface is positioned radially outward with respect to the inner peripheral edge of the first window portion. The claw portion is formed on the first friction plate. The claw portion faces the stopper surface with a gap in the circumferential direction.

[0009] The power transmission device according to the third embodiment is configured as follows in the power transmission device according to the second embodiment. The first friction plate has a plate body and a contact portion. The plate body is annular. The contact portion extends radially outward from the plate body. The contact portion contacts the elastic member in the circumferential direction. The claw portion extends axially from the contact portion toward the first rotating member.

[0010] The power transmission device according to the fourth embodiment is configured as follows in the power transmission device according to any of the first to third embodiments: The first regulating mechanism is arranged radially outward with respect to the outer edge of the first window portion.

[0011] The power transmission device according to the fifth embodiment further comprises a second friction plate and a fastening member in addition to the power transmission device according to any of the first to fourth embodiments. The fastening member fastens the second friction plate and the second rotating member. The first regulating mechanism is positioned radially outward from the fastening member.

[0012] The power transmission device according to the sixth embodiment is configured as follows in the power transmission device according to the fifth embodiment. The first regulating mechanism has a stopper surface and a claw portion. The stopper surface is formed on the first rotating member. The stopper surface is positioned radially outward with respect to the inner peripheral edge of the first window portion. The claw portion is formed on the first friction plate. The claw portion faces the stopper surface at a distance in the circumferential direction. The first friction plate has a plate body portion and a contact portion. The plate body portion is annular. The contact portion extends radially outward from the plate body portion. The contact portion contacts the end face of the elastic member in the circumferential direction. The claw portion extends axially from the contact portion toward the first rotating member. The contact portion has a notch. The fastening member is exposed through the notch in an axial view.

[0013] The power transmission device according to the seventh embodiment further comprises a second restricting mechanism in addition to the power transmission device according to any of the first to sixth embodiments. The second restricting mechanism is configured to restrict the range of the relative rotation angle between the first rotating member and the second rotating member. The first restricting mechanism is positioned radially inward from the second restricting mechanism.

[0014] The power transmission device according to the eighth embodiment further comprises a first friction member in addition to the power transmission device according to any of the first to seventh embodiments. The first friction member is configured to rotate integrally with the second rotating member. The first friction plate is positioned between the first rotating member and the first friction member in the axial direction.

[0015] The power transmission device according to the ninth embodiment further comprises a biasing member in addition to the power transmission device according to the eighth embodiment. The biasing member is positioned in the axial direction between the first friction member and the second rotating member. The biasing member biases the first friction member toward the first friction plate. [Effects of the Invention]

[0016] According to the present invention, the amount of wear on the friction plate can be reduced. [Brief explanation of the drawing]

[0017] [Figure 1] Front view of the power transmission device. [Figure 2] Cross-sectional view along line II-II in Figure 1. [Figure 3] Front view of the first friction plate. [Figure 4] Front view of the power transmission device with the first friction plate and output rotating body extracted. [Figure 5] Figure 4 shows a cross-sectional view along the VV line. [Figure 6] A graph showing torque characteristics. [Modes for carrying out the invention]

[0018] Hereinafter, the power transmission device 100 according to the present embodiment will be described with reference to the drawings. In the following description, the axial direction is the direction in which the rotation axis O of the power transmission device 100 extends. 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. The first axial side means the right side in FIG. 2, and the second axial side means the left side in FIG. 2.

[0019] FIG. 1 is a front view of the power transmission device 100, and FIG. 2 is a sectional view taken along line II-II of FIG. 1. As shown in FIGS. 1 and 2, the power transmission device 100 includes a torque limiter unit 3, a damper unit 4, and a first fastening member 5. The torque limiter unit 3 and the damper unit 4 basically rotate integrally with each other. The power transmission device 100 is provided between an internal combustion engine (not shown) and an output side member (not shown). The output side member is, for example, an electric motor or a transmission. The power transmission device 100 is attached to a flywheel (not shown). For example, in FIG. 2, the internal combustion engine is disposed on the left side of the power transmission device 100, and the output side member is disposed 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 member and to attenuate torque fluctuations.

[0020] [Damper Unit] The damper unit 4 is attached to the torque limiter unit 3 by the first fastening member 5. The damper unit 4 is configured to attenuate rotational fluctuations. The damper unit 4 includes an input rotating body 41 (an example of a second rotating member), an output rotating body 42 (an example of a first rotating member), a plurality of elastic members 43, a first friction plate 44, a plurality of first restricting mechanisms 45, a plurality of second restricting mechanisms 46, a first friction member 47, and a biasing member 48.

[0021] [Input Rotating Body] The input rotating body 41 rotates integrally with a second friction plate 33 of the torque limiter unit 3 described later. The input rotating body 41 is disposed so as to be relatively rotatable with respect to the output rotating body 42.

[0022] The input rotating body 41 has a pair of input plates 41a and 41b. More specifically, the input rotating body 41 has a first input plate 41a and a second input plate 41b. Both the first input plate 41a and the second input plate 41b are annular members having a central hole. The first input plate 41a and the second input plate 41b rotate integrally with each other. Furthermore, the first input plate 41a and the second input plate 41b are immovable relative to each other in the axial direction.

[0023] The first input plate 41a and the second input plate 41b are spaced apart from each other in the axial direction. The first input plate 41a is positioned on the first axial side relative to the second input plate 41b.

[0024] The first input plate 41a and the second input plate 41b each have a plurality of second window portions 411a and 411b. In this embodiment, the first input plate 41a and the second input plate 41b each have four second window portions 411a and 411b, but the number is not limited to this.

[0025] Each second window section 411a, 411b extends in the circumferential direction. Each second window section 411a, 411b is spaced apart from each other in the circumferential direction. Each second window section 411a, 411b is configured to accommodate an elastic member 43.

[0026] The input rotating body 41 further has a plurality of second fastening members 41c. The second fastening members 41c fasten the first input plate 41a and the second input plate 41b at their outer peripheries.

[0027] The second fastening member 41c is positioned on the first axial side of the first side plate 31, which will be described later. In an axial view, the second fastening member 41c overlaps with the first side plate 31. The second fastening member 41c is, for example, a rivet.

[0028] <Output Rotating Body> The output rotating body 42 is configured to transmit torque from the input rotating body 41 to the output side member. The output rotating body 42 is positioned axially between the first input plate 41a and the second input plate 41b. The output rotating body 42 is positioned to be rotatable relative to the first input plate 41a and the second input plate 41b.

[0029] The output rotating body 42 has a hub 421 and a flange plate 422. The hub 421 and the flange plate 422 are constructed as separate components, but they may also be formed integrally as a single component. The hub 421 and the flange plate 422 rotate together.

[0030] The hub 421 is cylindrical and is positioned within the central holes of the first input plate 41a and the second input plate 41b. A splined hole extending in the axial direction is formed on the inner circumference of the hub 421. The input shaft of the output-side member can be spline-fitted into this splined hole.

[0031] The flange plate 422 extends radially from the outer circumferential surface of the hub 421. The flange plate 422 is formed in an annular shape. The flange plate 422 is rotatably positioned relative to the first input plate 41a and the second input plate 41b. In the axial direction, the flange plate 422 is positioned between the first input plate 41a and the second input plate 41b.

[0032] The flange plate 422 has a plurality of first window portions 423. Each first window portion 423 extends in the circumferential direction. In this embodiment, the flange plate 422 has four first window portions 423, but this number is not limited to this. Each first window portion 423 is spaced apart from each other in the circumferential direction. Each first window portion 423 is configured to accommodate an elastic member 43. In an axial view, each first window portion 423 is positioned to overlap with each second window portion 411a, 411b.

[0033] <Elastic material> 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 coil spring 431 and a pair of spring seats 432. The coil spring 431 is sandwiched in the circumferential direction by the pair of spring seats 432.

[0034] The elastic member 43 is housed in the first window portion 423 of the output rotating body 42. The elastic member 43 is also housed in the second window portion 411a of the first input plate 41a, and also in the second window portion 411b of the second input plate 41b.

[0035] <First Friction Plate> The first friction plate 44 is positioned axially between the input rotor 41 and the output rotor 42. More specifically, the first friction plate 44 is positioned axially between the first input plate 41a and the flange plate 422. More specifically, the first friction plate 44 is positioned axially between the first friction member 47 and the flange plate 422. The first friction plate 44 is positioned to be rotatable relative to the input rotor 41 and the output rotor 42.

[0036] Figure 3 is a front view of the first friction plate 44. As shown in Figures 2 and 3, the first friction plate 44 has a plate body portion 441 and a plurality of contact portions 442. In this embodiment, the first friction plate 44 has a pair of contact portions 442.

[0037] The plate body portion 441 is substantially rectangular in an axial view. The plate body portion 441 is annular. That is, the plate body portion 441 has an opening 443 in the center. The hub 421 passes through the opening 443 of the plate body portion 441 in the axial direction. The plate body portion 441 is positioned radially inward relative to each first window portion 423 and each second window portion 411a, 411b.

[0038] The plate body portion 441 is flat. Preferably, the plate body portion 441 does not have an uneven surface. In particular, the surface of the plate body portion 441 that comes into contact with the first friction member 47 does not have any uneven surfaces.

[0039] Each contact portion 442 extends radially outward from the plate body portion 441. Each contact portion 442 is positioned diagonally opposite to each other. Each contact portion 442 is positioned on the second axial side relative to the plate body portion 441. As a result, a stepped portion is formed between each contact portion 442 and the plate body portion 441.

[0040] Each contact portion 442 is positioned between a pair of adjacent elastic members 43 in the circumferential direction. Each contact portion 442 is in contact with the adjacent pair of elastic members 43 in the circumferential direction. That is, each contact portion 442 is sandwiched between the pair of elastic members 43.

[0041] Each contact portion 442 has a notch 444. The notch 444 opens radially outward. The notch 444 may also be a through hole. The first fastening member 5 is exposed through the notch 444 in an axial view.

[0042] <First Regulatory Organization> Figure 4 is a front view of the power transmission device 100 with only the output rotating body 42 and the first friction plate 44 extracted, and Figure 5 is a cross-sectional view taken along line VV in Figure 4. As shown in Figures 4 and 5, the first regulating mechanism 45 is configured to restrict 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. In other words, the first friction plate 44 cannot rotate relative to the output rotating body 42 beyond a certain angular range. In this embodiment, the power transmission device 100 has a pair of first regulating mechanisms 45.

[0043] Each first restricting mechanism 45 is positioned radially outward with respect to the inner peripheral edge 424 of the first window portion 423. Furthermore, each first restricting mechanism 45 is positioned radially outward with respect to the outer peripheral edge 425 of the first window portion 423. Each first restricting mechanism 45 is positioned radially outward with respect to the first fastening member 5.

[0044] Each first regulating mechanism 45 has a first stopper surface 451a, a second stopper surface 451b, and a claw portion 452.

[0045] The first stopper surface 451a and the second stopper surface 451b are formed on the output rotating body 42. More specifically, the first stopper surface 451a and the second stopper surface 451b are formed on the flange plate 422. The first stopper surface 451a and the second stopper surface 451b are part of the flange plate 422. The first stopper surface 451a and the second stopper surface 451b are arranged on the same circumference.

[0046] The first stopper surface 451a and the second stopper surface 451b are positioned radially outward with respect to the inner peripheral edge 424 of the first window portion 423. Furthermore, the first stopper surface 451a and the second stopper surface 451b are positioned radially outward with respect to the outer peripheral edge 425 of the first window portion 423. The first stopper surface 451a and the second stopper surface 451b are positioned radially outward with respect to the first fastening member 5.

[0047] The first stopper surface 451a and the second stopper surface 451b are oriented in the circumferential direction. The first stopper surface 451a and the second stopper surface 451b are formed to face each other. The first stopper surface 451a contacts the claw portion 452 when the first friction plate 44 rotates relative to the output rotating body 42 in the forward rotation direction. The second stopper surface 451b contacts the claw portion 452 when the first friction plate 44 rotates relative to the output rotating body 42 in the reverse rotation direction. Note that the direction in which the power transmission device 100 rotates when a vehicle equipped with the power transmission device 100 moves forward is defined as the forward rotation direction, and the opposite direction of rotation is defined as the reverse rotation direction.

[0048] The claw portion 452 is formed on the first friction plate 44. The claw portion 452 is part of the first friction plate 44. The claw portion 452 extends axially from the contact 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 contact portion 442 toward the second axial side.

[0049] The claw portion 452 is positioned radially outward with respect to the inner peripheral edge 424 of the first window portion 423. Furthermore, the claw portion 452 is positioned radially outward with respect to the outer peripheral edge 425 of the first window portion 423. The claw portion 452 is also positioned radially outward with respect to the first fastening member 5.

[0050] The claw portion 452 is positioned between the first stopper surface 451a and the second stopper surface 451b in the circumferential direction. The claw portion 452 faces the first stopper surface 451a and the second stopper surface 451b with a gap between them in the circumferential direction. The claw portion 452 is positioned on the same circumference as the first stopper surface 451a and the second stopper surface 451b.

[0051] The distance between the claw portion 452 and the first stopper surface 451a is different from the distance between the claw portion 452 and the second stopper surface 451b. Specifically, the distance between the first friction plate 44 and the first stopper surface 451a is greater than the distance between the first friction plate 44 and the second stopper surface 451b.

[0052] <Second Regulatory Organization> As shown in Figures 1 and 2, each second regulating mechanism 46 is configured to restrict the range of relative rotation angles between the input rotating body 41 and the output rotating body 42. The range of relative rotation angles between the input rotating body 41 and the output rotating body 42 restricted by each second regulating mechanism 46 is greater than the range of relative rotation angles between the first friction plate 44 and the output rotating body 42 restricted by each first regulating mechanism 45.

[0053] Each second restricting mechanism 46 is positioned radially outward relative to each first restricting mechanism 45. That is, each first restricting mechanism 45 is positioned radially inward relative to each second restricting mechanism 46.

[0054] Each second regulating mechanism 46 has a pair of protrusions 461 and a stopper portion 462. The pair of protrusions 461 are formed on the output rotating body 42. The pair of protrusions 461 are part of the output rotating body 42. The pair of protrusions 461 project radially outward from the flange plate 422 of the output rotating body 42.

[0055] The stopper portion 462 is formed on the input rotating body 41. The stopper portion 462 is a part of the input rotating body 41. More specifically, the stopper portion 462 is a part of the second input plate 41b. The stopper portion 462 is the part of the second input plate 41b that extends axially from the main body. The stopper portion 462 is formed by bending a part of the second input plate 41b axially.

[0056] The stopper portion 462 is positioned between a pair of protrusions 461 in the circumferential direction. The stopper portion 462 faces each protrusion 461 at a distance in the circumferential direction. That is, the stopper portion 462 is positioned on the same circumference as each protrusion 461.

[0057] <First friction member> The first friction member 47 is configured to rotate integrally with the input rotating body 41. The first friction member 47 is positioned axially between the first friction plate 44 and the first input plate 41a. The first friction member 47 has an annular body portion 471 and an engaging portion 472 extending axially from the body portion 471.

[0058] The main body portion 471 is in contact with the first friction plate 44. Torque fluctuations are dampened by friction damping caused by sliding between the main body portion 471 and the first friction plate 44. The engaging portion 472 is engaged with the first input plate 41a of the input rotating body 41.

[0059] <Biasing member> The biasing member 48 is positioned in the axial direction between the first friction member 47 and the first input plate 41a. The biasing member 48 biases the first friction member 47 toward the first friction plate 44. The biasing member 48 is, for example, a disc spring.

[0060] <Second and third friction members> The second friction member 49a and the third friction member 49b are configured to rotate integrally with the output rotor 42. More specifically, the second friction member 49a and the third friction member 49b are attached to the flange plate 422. The second friction member 49a is positioned axially between the first friction plate 44 and the flange plate 422. The third friction member 49b is positioned between the second input plate 41b and the flange plate 422. The second friction member 49a may rotate integrally with the first friction plate 44, and the third friction member 49b may rotate integrally with the second input plate 41b. Furthermore, the second friction member 49a may be rotatable relative to both the first friction plate 44 and the flange plate 422. The third friction member 49b may be rotatable relative to both the second input plate 41b and the flange plate 422.

[0061] The frictional force generated between the second friction member 49a and the first friction plate 44 is smaller than the frictional force generated between the first friction member 47 and the first friction plate 44. Also, the frictional force generated between the third friction member 49b and the first friction plate 44 is smaller than the frictional force generated between the first friction member 47 and the first friction plate 44.

[0062] [torque limiter] As shown in Figure 2, the torque limiter unit 3 is rotatably positioned around the rotation axis O. The torque limiter unit 3 is positioned on the second axial side relative to the damper unit 4. The torque limiter unit 3 is annular in shape. The torque limiter unit 3 is attached to the flywheel or the like by multiple bolts.

[0063] The torque limiter unit 3 is configured to limit the torque transmitted between the flywheel and the damper unit 4. In other words, the torque limiter unit 3 is configured to restrict the transmission of torque exceeding a predetermined value in the power transmission device 100.

[0064] The torque limiter unit 3 includes a first side plate 31, 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.

[0065] <First side plate and second side plate> The first side plate 31 and the second side plate 32 are attached to the 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 in shape. The second side plate 32 is positioned axially apart from the first side plate 31. The second side plate 32 is positioned axially second to the first side plate 31. Between the first side plate 31 and the second side plate 32 are the second friction plate 33, the first friction material 34a, the second friction material 34b, the pressure plate 35, and the disc spring 36. The thickness of the second side plate 32 is thinner than the thickness of the first side plate 31.

[0066] <Second Friction Plate> The second friction plate 33 is an annular plate. The second friction plate 33 is rotatably positioned around the rotation axis O. In the axial direction, the second friction plate 33 is positioned between the first side plate 31 and the second side plate 32. The second friction plate 33 frictionally engages with the first side plate 31 via the first friction material 34a. The second friction plate 33 also frictionally engages with the pressure plate 35 via the second friction material 34b.

[0067] The second friction plate 33 is attached to the input rotating body 41. More specifically, the second friction plate 33 is attached to the second input plate 41b. The second friction plate 33 is attached to the second input plate 41b by the first fastening member 5. The second friction plate 33 rotates integrally with the input rotating body 41.

[0068] <Friction material> The first friction material 34a and the second friction material 34b are annular in shape and extend in the circumferential direction. The first friction material 34a is positioned on the first axial side relative to the second friction plate 33. The second friction material 34b is positioned on the second axial side relative to the second friction plate 33. The first friction material 34a and the second friction material 34b are attached to the second friction plate 33.

[0069] <Pressure Plate> The pressure plate 35 is annular in shape and extends in the circumferential direction. The pressure plate 35 is configured to press against the second friction plate 33. The pressure plate 35 presses against the second friction plate 33 via the second friction material 34b. In the axial direction, the pressure plate 35 is positioned between the second friction material 34b and the disc spring 36.

[0070] The pressure plate 35 is configured to rotate integrally with the first side plate 31. More specifically, the pressure plate 35 has a plurality of engaging claws 351 that engage with the first side plate 31.

[0071] <Disc spring> The disc spring 36 is positioned axially between the second side plate 32 and the pressure plate 35. The disc spring 36 biases the pressure plate 35 toward the second friction plate 33. That is, the disc spring 36 biases the pressure plate 35 toward the first axial direction. 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.

[0072] <First fastening member> The first fastening member 5 fastens the second friction plate 33 and the input rotating body 41. More specifically, the first fastening member 5 fastens the second friction plate 33 and the second input plate 41b.

[0073] <Operation> Figure 6 is a graph showing the relationship between torsional angle and torsional torque. In Figure 6, 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 applied to the damper unit 4.

[0074] As shown in Figure 6, the first regulating mechanism 45 is not operating when the twist angle changes from 0 to θ1, that is, the claw portion 452 is not in contact with the first stopper surface 451a. Therefore, the first friction plate 44 can rotate relative to the output rotating body 42 and rotates integrally with the input rotating body 41. As a result, frictional forces are generated between the second friction member 49a and the first friction plate 44, and between the third friction member 49b and the second input plate 41b.

[0075] When the torsional angle reaches θ1, the first regulating mechanism 45 is activated, meaning the claw portion 452 comes into contact with the first stopper surface 451a. Therefore, while the torsional angle is changing 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. As a result, frictional forces are generated between the first friction member 47 and the first friction plate 44, and between the third friction member 49b and the second input plate 41b. When the torsional angle reaches θ2, the second regulating mechanism 46 is activated, meaning the stopper portion 462 comes into contact with the protruding portion 461, so the input rotating body 41 cannot rotate relative to the output rotating body 42.

[0076] As the torsional angle changes from θ2 to θ3, the input rotating body 41 and the first friction plate 44 rotate together, generating frictional forces between the second friction member 49a and the first friction plate 44, and between the third friction member 49b and the second input plate 41b.

[0077] When the torsional angle reaches θ3, the contact portion 442 of the first friction plate 44 comes into contact with the elastic member 43. Therefore, the first friction plate 44 rotates relative to the input rotating body 41 until the torsional angle changes from θ3 to 0. As a result, frictional forces are generated between the first friction member 47 and the first friction plate 44, and between the third friction member 49b and the second input plate 41b.

[0078] When the torsional angle becomes 0, the other elastic member comes into contact with the contact portion 442 of the first friction plate 44, and the contact portion 442 is sandwiched between the pair of elastic members, and the power transmission device 100 returns to its initial state. While the torsional angle is changing from 0 to θ4, the first regulating mechanism 45 is not operating, that is, the claw portion 452 is not in contact with the second stopper surface 451b, so the first friction plate 44 can rotate relative to the output rotating body 42 and rotates integrally with the input rotating body 41. As a result, frictional forces are generated between the second friction member 49a and the first friction plate 44, and between the third friction member 49b and the second input plate 41b.

[0079] When the torsional angle reaches θ4, the first regulating mechanism 45 is activated, meaning the claw portion 452 comes into contact with the second stopper surface 451b. Therefore, while the torsional angle is changing 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. As a result, frictional forces are generated between the first friction member 47 and the first friction plate 44, and between the third friction member 49b and the second input plate 41b. When the torsional angle reaches θ5, the second regulating mechanism 46 is activated, meaning the stopper portion 462 comes into contact with the protruding portion 461, so the input rotating body 41 cannot rotate relative to the output rotating body 42.

[0080] As the twist angle changes from θ5 to θ6, the input rotating body 41 and the first friction plate 44 rotate together, generating frictional forces between the second friction member 49a and the first friction plate 44, and between the third friction member 49b and the second input plate 41b.

[0081] When the torsional angle reaches θ6, the contact portion 442 of the first friction plate 44 comes into contact with the elastic member 43. Therefore, the first friction plate 44 rotates relative to the input rotating body 41 until the torsional angle changes from θ6 to 0. As a result, frictional forces are generated between the first friction member 47 and the first friction plate 44, and between the third friction member 49b and the second input plate 41b.

[0082] When the torsional angle becomes 0, the other elastic member comes into contact with the contact portion 442 of the first friction plate 44, and the contact portion 442 returns to its initial state where it is sandwiched between the pair of elastic members.

[0083] [Differentiation] Although embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications are possible without departing from the spirit of the invention. Furthermore, the following modifications can basically be applied simultaneously.

[0084] (a) In the above embodiment, the first regulating mechanism 45 was positioned radially outward with respect to the outer peripheral edge 425 of the first window portion 423, but the position of the first regulating mechanism 45 is not limited thereto. For example, the first regulating mechanism 45 may be positioned radially outward with respect to the inner peripheral edge 424 of the first window portion 423 and radially inward with respect to the outer peripheral edge 425 of the first window portion 423.

[0085] (b) In the above embodiment, the claw portion 452 of the first regulating mechanism 45 is formed on the first friction plate 44, and the first stopper surface 451a and the second stopper surface 451b of the first regulating mechanism 45 are formed on the output rotating body 42, but the configuration of the first regulating mechanism 45 is not limited thereto. For example, the claw portion 452 may be formed on the output rotating body 42, and the first stopper surface 451a and the second stopper surface 451b may be formed on the first friction plate 44.

[0086] (c) In the above embodiment, the first stopper surface 451a and the second stopper surface 451b of the first regulating mechanism 45 are formed on the output rotating body 42, but the configuration of the first regulating mechanism 45 is not limited thereto. For example, the first stopper surface 451a and the second stopper surface 451b may be formed on the input rotating body 41. More specifically, the first stopper surface 451a and the second stopper surface 451b may be formed on the first input plate 41a. In this case, the claw portion 452 extends toward the first input plate 41a. The first friction member 47 and the disc spring 48 are arranged between the flange plate 422 and the first friction plate 44. The second friction member 49a is also arranged between the first input plate 41a and the first friction plate 44. [Explanation of Symbols]

[0087] 5: First fastening member 33: Second friction plate 41: Input Rotation Body 411a: Second window section 411b: Second Window Section 42: Output Rotating Body 421: Hub 423: First Window Section 424: Inner periphery 425: Outer edge 43: Elastic member 44: First friction plate 441: Plate body 442: Contact part 444: Notch 45: First Regulatory Organization 451a: First stopper surface 451b: Second stopper surface 452: Nail area 46: Second Regulatory Organization 47: First friction member 48: Biasing member 100: Power transmission device

Claims

1. A first rotating member having a first window portion extending in the circumferential direction, A second rotating member having a second window portion extending in the circumferential direction and arranged to be rotatable relative to the first rotating member, Elastic members disposed within the first window portion and the second window portion, A first friction plate is positioned between the first rotating member and the second rotating member in the axial direction and is rotatable relative to the first rotating member and the second rotating member, A first restricting mechanism is positioned radially outward with respect to the inner periphery of the first window portion and configured to restrict the range of the relative rotation angle between the first friction plate and the first rotating member, A power transmission device equipped with the following features.

2. The aforementioned first regulatory body, A stopper surface formed on the first rotating member and positioned radially outward with respect to the inner peripheral edge of the first window portion, The first friction plate has a claw portion formed thereon, which is spaced apart from the stopper surface in the circumferential direction and faces it, Having, The power transmission device according to claim 1.

3. The first friction plate is, The ring-shaped plate body, A contact portion extending radially outward from the plate body and in contact with the elastic member in the circumferential direction, It has, The claw portion extends axially from the contact portion toward the first rotating member, The power transmission device according to claim 2.

4. The first regulating mechanism is arranged radially outward with respect to the outer peripheral edge of the first window portion. The power transmission device according to claim 1.

5. The second friction plate and The device further comprises a fastening member for fastening the second friction plate and the second rotating member, The first regulating mechanism is positioned radially outward with respect to the fastening member, The power transmission device according to claim 1.

6. The aforementioned first regulatory body, A stopper surface formed on the first rotating member and positioned radially outward with respect to the inner peripheral edge of the first window portion, The first friction plate has a claw portion formed thereon, which is spaced apart from the stopper surface in the circumferential direction and faces it, It has, The first friction plate is, The ring-shaped plate body, A contact portion extending radially outward from the plate body and in contact with the end face of the elastic member in the circumferential direction, It has, The claw portion extends axially from the contact portion toward the first rotating member, The aforementioned contact portion has a notch, The fastening member is exposed through the notch in an axial view. The power transmission device according to claim 5.

7. The system further comprises a second restricting mechanism configured to restrict the range of relative rotation angles between the first rotating member and the second rotating member, The first regulating mechanism is positioned radially inward relative to the second regulating mechanism. The power transmission device according to claim 1.

8. The system further comprises a first friction member configured to rotate integrally with the second rotating member, The first friction plate is positioned between the first rotating member and the first friction member in the axial direction. The power transmission device according to claim 1.

9. The device further comprises a biasing member positioned in the axial direction between the first friction member and the second rotating member, which biases the first friction member toward the first friction plate. The power transmission device according to claim 8.

Images