Damper device and power transmission device

Abstract

To reduce an area where a first rotating member and a second rotating member are covered with a friction member.SOLUTION: The first friction member is disposed at an interval from the outer peripheral surface of the hub in the radial direction. The flange plate includes a plurality of support surfaces. Each support surface is a surface facing outward in the radial direction among the surfaces defining each accommodation hole. The first friction member includes a sliding portion and a plurality of protruding portions. The sliding portion is disposed between the first rotary member and the flange plate. The sliding portion has an annular shape extending in the circumferential direction. Each protruding portion protrudes from the sliding portion in the axial direction and is disposed in each accommodation hole. Each protrusion is supported by a respective support surface.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] The damper device includes a clutch plate, a flange plate, and a friction member. The friction member is disposed between the clutch plate and the flange plate. The friction member slides against the clutch plate or the flange plate to suppress resonance. The friction member is supported by the outer peripheral surface of the hub. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-55810 Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, since the friction member is supported by the outer peripheral surface of the hub, if the outer diameter of the friction member is increased, the area of ​​the first rotating member and the second rotating member covered by the friction member also increases. This makes it difficult to form a through hole that penetrates the damper device. Therefore, an object of the present invention is to reduce the area of ​​the first rotating member and the second rotating member covered by the friction member. [Means for solving the problem]

[0005] A damper device according to a first aspect includes a first rotating member, a second rotating member, multiple elastic members, and a first friction member. The first rotating member has multiple windows. The second rotating member is arranged to be rotatable relative to the first rotating member. The second rotating member has a flange plate and a hub. The flange plate includes multiple accommodating holes. The hub is cylindrical and extends axially. Each elastic member is arranged in each window and each accommodating hole. Each elastic member elastically connects the first rotating member and the second rotating member. The first friction member is arranged radially spaced apart from the outer circumferential surface of the hub. The flange plate includes multiple support surfaces. Each support surface is a surface that faces radially outward among the surfaces that define each accommodating hole. The first friction member has a sliding portion and multiple protruding portions. The sliding portion is arranged between the first rotating member and the flange plate. The sliding portion is annular and extends circumferentially. Each protruding portion protrudes axially from the sliding portion and is arranged in each accommodating hole. Each protrusion is supported by a respective support surface.

[0006] With this configuration, since the protrusion is supported by the support surface, the first friction member does not need to be supported by the hub. Therefore, the first friction member can be disposed with a gap between it and the outer peripheral surface of the hub. As a result, the area covered by the first friction member can be reduced.

[0007] A damper device according to a second aspect is the damper device according to the first aspect, and is configured as follows: The first rotating member has a plurality of first through holes. The first through holes are arranged in a circumferential direction. The second rotating member has a plurality of second through holes. Each second through hole overlaps with a corresponding first through hole in an axial view. The first friction members are arranged radially outward of each of the first through holes and each of the second through holes.

[0008] The damper device according to the third aspect is the damper device according to the first or second aspect, and is configured as follows: When viewed in the axial direction, each support surface has an arc shape centered on the rotation axis.

[0009] A damper device according to a fourth aspect is the damper device according to the third aspect, and is configured as follows: Each protrusion has an inner abutment surface that contacts each support surface, and each inner abutment surface has an arc shape centered on the rotation axis when viewed in the axial direction.

[0010] A damper device according to a fifth aspect is the damper device according to any one of the first to fourth aspects, and is configured as follows: The flange plate includes a plurality of stopper surfaces. Each stopper surface is a surface that faces in the circumferential direction among the surfaces that define each accommodating hole. Each protrusion has a plurality of abutment surfaces. Each abutment surface faces a corresponding stopper surface in the circumferential direction.

[0011] A damper device according to a sixth aspect is the damper device according to the fifth aspect, and is configured as follows: each protrusion has an inner abutment surface that contacts each support surface, and each abutment surface is spaced from the inner abutment surface.

[0012] A damper device according to a seventh aspect is the damper device according to any one of the first to sixth aspects, and is configured as follows: Each protrusion has a cavity therein.

[0013] A damper device according to an eighth aspect is the damper device according to the seventh aspect, and is configured as follows: Each cavity extends in the axial direction, and each cavity opens at the tip end of the protrusion and closes at the base end of the protrusion.

[0014] A damper device according to a ninth aspect is the damper device according to any one of the first to eighth aspects, further comprising an intermediate plate. The intermediate plate is arranged to be rotatable relative to the first rotating member and the second rotating member. The intermediate plate has housing portions that house the respective elastic members. The first friction member is configured to rotate integrally with the intermediate plate. The flange plate is arranged between the first friction member and the intermediate plate.

[0015] A damper device according to a tenth aspect is the damper device according to the ninth aspect, further comprising a second friction member. The second friction member is configured to rotate integrally with the first rotating member. The second friction member is configured to slide against the intermediate plate.

[0016] A damper device according to an eleventh aspect is the damper device according to the tenth aspect, and is configured as follows: the intermediate plate has an engaging recess; the first friction member has an engaging protrusion that engages with the engaging recess; and the second friction member has an annular recess that extends circumferentially on a surface facing the intermediate plate. The annular recess faces the engaging protrusion and the engaging recess.

[0017] A power transmission device according to a twelfth aspect is configured to be attached to a crankshaft. The power transmission device includes a torque limiter, the damper device according to the second aspect, and a fastening member. The torque limiter has a flywheel, a friction plate, a pressure plate, and an urging member. The flywheel has a base portion and a support portion. The support portion is disposed on a first axial side spaced apart from the base portion. The friction plate is disposed between the base portion and the support portion. The pressure plate presses the friction plate. The urging member urges the pressure plate toward the friction plate. The fastening member is configured to fasten the base member to the crankshaft. The fastening member is exposed in the axial direction through the first and second through holes. [Effects of the Invention]

[0018] According to the present invention, the area covered by the friction member can be reduced. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. [Figure 2] Cross-sectional view of line II-II in Figure 1. [Figure 3] FIG. 2 is a front view of the damper device with some components removed. [Figure 4] Enlarged view of Figure 3. [Figure 5] Enlarged view of Figure 2. [Figure 6] FIG. [Figure 7] FIG. 2 is a front view of the damper device with some components removed. [Figure 8] FIG. 2 is a front view of the damper device with some components removed. [Figure 9] FIG. 3 is a cross-sectional view of the power transmission device before assembly. [Figure 10] FIG. 10 is a cross-sectional view of the power transmission device in a state where the biasing force of the second disc spring is disabled. DETAILED DESCRIPTION OF THE INVENTION

[0020] The power transmission device 100 according to this embodiment will be described below with reference to the drawings. In the following description, the axial direction refers to the direction in which the rotation axis O of the power transmission device 100 extends. The circumferential direction refers to the circumferential direction of a circle centered on the rotation axis O, and the radial direction refers to the radial direction of a circle centered on the rotation axis O. The first axial side refers to the right side in FIG. 2, and the second axial side refers to the left side in FIG. 2.

[0021] FIG. 1 is a front view of a power transmission device 100, and FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. As shown in FIGS. 1 and 2, the power transmission device 100 includes a torque limiter 3, a damper device 4, a plurality of first fastening members 5 (an example of fastening members), and a plurality of second fastening members 6. The torque limiter 3 and the damper device 4 basically rotate integrally with each other. The power transmission device 100 is provided between an internal combustion engine (not shown) and an output member (not shown) in a torque transmission path. The output member may be, for example, an electric motor or a transmission. The power transmission device 100 is attached to a crankshaft 101. For example, in FIG. 2, the internal combustion engine is disposed on the left side of the power transmission device 100, and the output 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 member and to attenuate torque fluctuations.

[0022] [Damper device] The damper device 4 is attached to the torque limiter 3 by a second fastening member 6. The damper device 4 is configured to damp rotation fluctuations. The damper device 4 has an input rotating body 41 (an example of a first rotating member), an output rotating body 42 (an example of a second rotating member), multiple elastic members 43, a first friction member 44, an intermediate plate 45, a second friction member 46, and a first disc spring 47.

[0023] <Input rotor> The input rotor 41 rotates integrally with a friction plate 32 of the torque limiter 3, which will be described later. The input rotor 41 has a first plate 41a and a second plate 41b. The first plate 41a and the second plate 41b are both annular members having a center 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 are immovable relative to each other in the axial direction.

[0024] The first plate 41a and the second plate 41b are arranged at an interval in the axial direction, and the first plate 41a is arranged on a first side in the axial direction relative to the second plate 41b.

[0025] The first plate 41a and the second plate 41b each have a plurality of window portions 411a, 411b. In this embodiment, the first plate 41a and the second plate 41b each have four window portions 411a, 411b, but the number of window portions is not limited to four.

[0026] The windows 411a and 411b are spaced apart from each other in the circumferential direction. Each of the windows 411a and 411b is configured to accommodate an elastic member 43 therein.

[0027] The first plate 41a has a plurality of first through holes 412a. The first through holes 412a are arranged in the circumferential direction. The first through holes 412a are arranged on the same circumference centered on the rotation axis O. The first through holes 412a are arranged radially inward of the window portions 411a.

[0028] The second plate 41b has a plurality of first through holes 412b. The first through holes 412b are arranged in the circumferential direction. The first through holes 412b are arranged on the same circumference centered on the rotation axis O. The first through holes 412b are arranged radially inward with respect to the window portion 411b. The first through holes 412b of the second plate 41b are arranged in the same position as the first through holes 412a of the first plate 41a. In other words, the first through holes 412b of the second plate 41b are arranged so as to overlap the first through holes 412a of the first plate 41a when viewed in the axial direction.

[0029] The input rotor 41 further includes a plurality of third fastening members 41c. The third fastening members 41c fasten the first plate 41a and the second plate 41b together at the outer peripheries of the first plate 41a and the second plate 41b.

[0030] The third fastening member 41c is disposed on a first axial side of a support portion 312, which will be described later. The third fastening member 41c overlaps with the support portion 312 when viewed in the axial direction. The third fastening member 41c is, for example, a rivet.

[0031] <Output rotor> The output rotor 42 is configured to transmit torque from the input rotor 41 to the output side member. The output rotor 42 is disposed axially between the first plate 41a and the second plate 41b. The output rotor 42 is disposed so as to be rotatable relative to the first plate 41a and the second plate 41b.

[0032] The output rotor 42 has a hub 421 and a flange plate 422. The hub 421 and the flange plate 422 are configured as separate members, but may be integrally formed as a single member. The hub 421 and the flange plate 422 rotate integrally.

[0033] The hub 421 is cylindrical. The hub 421 extends in the axial direction. The hub 421 is disposed within the central holes of the first plate 41a and the second plate 41b. A spline hole extending in the axial direction is formed in the inner periphery of the hub 421. An input shaft of an output side member can be spline-fitted into this spline hole.

[0034] 3 is a front view of the damper device 4 with the first plate 41a, the intermediate plate 45, the second friction member 46, the first disc spring 47, etc. removed. As shown in FIGS. 2 and 3, 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 arranged to be rotatable relative to the first plate 41a and the second plate 41b. The flange plate 422 is arranged between the first plate 41a and the second plate 41b in the axial direction.

[0035] The flange plate 422 has a plurality of accommodating holes 423. In this embodiment, the flange plate 422 has four accommodating holes 423, but this number is not limited to this. The accommodating holes 423 are arranged at intervals from one another in the circumferential direction. Each accommodating hole 423 is configured to accommodate an elastic member 43. Each accommodating hole 423 is arranged at a position overlapping with each window portion 411a, 411b when viewed in the axial direction.

[0036] Fig. 4 is an enlarged view of Fig. 3. As shown in Fig. 4, the flange plate 422 has a plurality of support surfaces 425. The support surfaces 425 are surfaces that face radially outward among the surfaces that define the accommodating hole 423. When viewed in the axial direction, each support surface 425 has an arc shape centered on the rotation axis O. The support surfaces 425 are arranged on the same circumference centered on the rotation axis O.

[0037] The flange plate 422 has a plurality of stopper surfaces 426. The stopper surfaces 426 are surfaces that face in the circumferential direction among the surfaces that define the accommodating hole 423. The flange plate 422 has two stopper surfaces 426 for each accommodating hole 423.

[0038] As shown in FIGS. 2 and 3, the flange plate 422 has a plurality of second through holes 424. The second through holes 424 are arranged in the circumferential direction. The second through holes 424 are arranged on the same circumference centered on the rotation axis O. The second through holes 424 are arranged radially inward with respect to the accommodating hole 423. The second through holes 424 of the flange plate 422 are arranged in the same position as the corresponding first through holes 412a. In other words, the second through holes 424 of the flange plate 422 overlap with the corresponding first through holes 412a when viewed in the axial direction.

[0039] <Elastic material> The elastic member 43 is configured to elastically connect the input rotor 41 and the output rotor 42 in the rotational direction. The elastic member 43 is, for example, a coil spring.

[0040] The elastic member 43 is housed in a housing hole 423 of the output rotor 42. The elastic member 43 is housed in a window 411a of the first plate 41a, and also in a window 411b of the second plate 41b. The elastic member 43 is also housed in a housing portion 452 of the intermediate plate 45, which will be described later.

[0041] <First friction member> 5 is an enlarged cross-sectional view of the power transmission device 100. As shown in FIG. 5, the first friction member 44 is disposed radially apart from the outer circumferential surface of the hub 421. Specifically, the first friction member 44 is disposed radially outward of the first through holes 412a, 412b and the second through holes 424. In this manner, the first friction member 44 does not cover the first through holes 412a, 412b and the second through holes 424. In other words, the first friction member 44 does not overlap the first through holes 412a, 412b and the second through holes 424 when viewed in the axial direction.

[0042] The first friction member 44 is disposed so as to be rotatable relative to the input rotor 41. That is, the first friction member 44 is disposed so as to be rotatable relative to the second plate 41b. The first friction member 44 is also rotatable relative to the flange plate 422 within a predetermined angle range. The first friction member 44 is configured to rotate relative to the second plate 41b, thereby sliding against the second plate 41b and generating a friction force.

[0043] Fig. 6 is a perspective view of the first friction member 44. As shown in Figs. 5 and 6, the first friction member 44 has a sliding portion 441, a plurality of protruding portions 442, and a plurality of engaging convex portions 443. The sliding portion 441, the plurality of protruding portions 442, and the plurality of engaging convex portions 443 are integrally formed by a single member. The first friction member 44 can be made of, for example, PA66-GF30.

[0044] The sliding portion 441 is annular and extends in the circumferential direction. The sliding portion 441 is disposed between the input rotor 41 and the flange plate 422 in the axial direction. More specifically, the sliding portion 441 is disposed between the second plate 41b and the flange plate 422 in the axial direction. The sliding portion 441 is configured to slide with the input rotor 41. More specifically, when the sliding portion 441 rotates relative to the second plate 41b, the sliding portion 441 slides with the second plate 41b and generates a frictional force. The sliding portion 441 does not have a friction material, but may have a friction material on the surface that comes into contact with the second plate 41b.

[0045] Each protrusion 442 protrudes from the sliding portion 441 to a first side in the axial direction. Each protrusion 442 is disposed in each accommodation hole 423. The tip end (first side end in the axial direction) of each protrusion 442 extends beyond each accommodation hole 423 and is positioned in the space between the flange plate 422 and the first plate 41a.

[0046] As shown in FIGS. 4 and 6 , each protrusion 442 is supported by a corresponding support surface 425. Specifically, each protrusion 442 has an inner abutment surface 442a that contacts the corresponding support surface 425. When viewed in the axial direction, each inner abutment surface 442a has an arc shape centered on the rotation axis O. Each inner abutment surface 442a has a shape that conforms to the corresponding support surface 425. The curvature of each inner abutment surface 442a is substantially the same as the curvature of each support surface 425. The first friction member 44 is positioned in the radial direction by each protrusion 442 being supported by the corresponding support surface 425. When the first friction member 44 rotates relative to the flange plate 422, each protrusion 442 slides on the corresponding support surface 425.

[0047] Each protrusion 442 has a pair of abutment surfaces 442b, 442c. Each abutment surface 442b, 442c faces in the circumferential direction a corresponding stopper surface 426. When the first friction member 44 rotates relative to the flange plate 422, each abutment surface 442b, 442c abuts against each stopper surface 426.

[0048] In this way, the first friction member 44 is rotatable relative to the flange plate 422 within an angular range in which the contact surfaces 442b, 442c come into contact with the stopper surfaces 426. In other words, when the torsion angle between the input rotor 41 and the output rotor 42 is within a predetermined range, the contact surfaces 442b, 442c do not come into contact with the stopper surfaces 426. Therefore, while the first friction member 44 rotates relative to the flange plate 422, it rotates integrally with the second plate 41b, and no friction force is generated between the first friction member 44 and the second plate 41b.

[0049] On the other hand, when the torsion angle between the input rotor 41 and the output rotor 42 exceeds a predetermined range, the contact surfaces 442b, 442c come into contact with the stopper surfaces 426. Therefore, the first friction member 44 rotates integrally with the flange plate 422 while rotating relative to the second plate 41b, generating a frictional force between the first friction member 44 and the second plate 41b.

[0050] Each of the contact surfaces 442b, 442c is separated from the inner contact surface 442a, that is, each of the contact surfaces 442b, 442c is not continuously connected to the inner contact surface 442a.

[0051] Each protrusion 442 has a plurality of cavities 442d therein. Each cavity 442d extends in the axial direction. Each cavity 442d is open at the tip end (first axial end) of each protrusion 442. Each cavity 442d is closed at the base end (second axial end) of each protrusion 442.

[0052] Each engaging protrusion 443 protrudes to a first side in the axial direction from the tip end surface of each protrusion 442. Each engaging protrusion 443 is disposed on the first side in the axial direction with respect to the flange plate 422.

[0053] <Intermediate plate> As shown in Fig. 5, the intermediate plate 45 is disposed between the flange plate 422 and the first plate 41a in the axial direction. The intermediate plate 45 cooperates with the first friction member 44 to sandwich the flange plate 422 in the axial direction. That is, the flange plate 422 is disposed between the first friction member 44 and the intermediate plate 45 in the axial direction. More specifically, the flange plate 422 is disposed between the sliding portion 441 and the intermediate plate 45 in the axial direction. The intermediate plate 45 is disposed so as to be rotatable relative to the input rotor 41 and the output rotor 42. The intermediate plate 45 is configured to rotate integrally with the first friction member 44.

[0054] 7 is a front view of the damper device 4 with the first plate 41a, the second friction member 46, the first disc spring 47, etc. removed. As shown in FIG. 7, the intermediate plate 45 has a plurality of engaging recesses 451. The engaging protrusions 443 of the first friction member 44 engage with each of the engaging recesses 451. Therefore, the first friction member 44 and the intermediate plate 45 rotate integrally with each other.

[0055] The intermediate plate 45 has a plurality of accommodating portions 452. Each accommodating portion 452 overlaps with each of the window portions 411a, 411b and the accommodating holes 423 when viewed in the axial direction. Each of the accommodating portions 452 accommodates a corresponding elastic member 43. That is, the elastic member 43 is accommodated in each of the window portions 411a, 411b, the accommodating holes 423, and the accommodating portion 452.

[0056] The intermediate plate 45 has an annular shape extending in the circumferential direction. The intermediate plate 45 is disposed radially outward of the first through holes 412a, 412b and the second through holes 424. In this manner, the intermediate plate 45 does not cover the first through holes 412a, 412b and the second through holes 424. In other words, the intermediate plate 45 does not overlap the first through holes 412a, 412b and the second through holes 424 when viewed in the axial direction.

[0057] <Second friction member> As shown in FIG. 5, the second friction member 46 is disposed between the intermediate plate 45 and the first plate 41a in the axial direction. The second friction member 46 is annular and extends in the circumferential direction. The second friction member 46 is disposed so as to be rotatable relative to the intermediate plate 45. The second friction member 46 is configured to slide against the intermediate plate 45. The second friction member 46 is configured to generate a friction force by rotating relative to the intermediate plate 45. The second friction member 46 is configured to rotate integrally with the input rotor 41.

[0058] 8 is a front view of the damper device 4 with the first plate 41a removed. As shown in FIG. 8, the second friction member 46 has a plurality of claws 461. Each claw 461 engages with the first plate 41a (see FIG. 2). Therefore, the second friction member 46 rotates integrally with the first plate 41a.

[0059] 5 and 8, the second friction member 46 is disposed at a distance from the outer peripheral surface of the hub 421 in the radial direction. Specifically, the second friction member 46 is disposed radially outward of the first through holes 412a, 412b and the second through holes 424. In this manner, the second friction member 46 does not cover the first through holes 412a, 412b and the second through holes 424. In other words, the second friction member 46 does not overlap the first through holes 412a, 412b and the second through holes 424 when viewed in the axial direction.

[0060] The second friction member 46 has an annular recess 462 extending in the circumferential direction on the surface facing the intermediate plate 45. The annular recess 462 faces the engaging protrusion 443 and the engaging recess 451. In other words, the second friction member 46 does not slide on the engaging protrusion 443. In addition, the second friction member 46 does not slide on the periphery of each engaging recess 451 of the intermediate plate 45.

[0061] <First disc spring> The first disc spring 47 biases the second friction member 46 toward the intermediate plate 45. The first disc spring 47 is disposed between the second friction member 46 and the first plate 41a in the axial direction. The first disc spring 47 is configured to rotate integrally with the second friction member 46.

[0062] The first disc spring 47 has a plurality of slits 471. Each slit 471 opens radially outward. Each claw portion 461 of the second friction member 46 engages with each slit 471. Therefore, the first disc spring 47 rotates integrally with the second friction member 46.

[0063] The first disc springs 47 are disposed at a radial distance from the outer peripheral surface of the hub 421. Specifically, the first disc springs 47 are disposed radially outward from the first through holes 412a, 412b and the second through holes 424. In this manner, the first disc springs 47 do not cover the first through holes 412a, 412b and the second through holes 424. In other words, the first disc springs 47 do not overlap the first through holes 412a, 412b and the second through holes 424 when viewed in the axial direction.

[0064] [Torque limiter] As shown in FIG. 2, the torque limiter 3 is disposed rotatably about the rotation axis O. The torque limiter 3 is disposed on a second axial side relative to the damper device 4. The torque limiter 3 is annular. The torque limiter 3 is attached to the crankshaft 101 by a plurality of first fastening members 5. Each of the first fastening members 5 is exposed on a first axial side. That is, in an unused power transmission device 100, each of the first fastening members 5 overlaps with each of the first through holes 412a, 412b and each of the second through holes 424 when viewed in the axial direction. The first fastening members 5 are, for example, bolts.

[0065] The torque limiter 3 is configured to limit the torque transmitted between the crankshaft 101 and the damper device 4. In other words, the torque limiter 3 is configured to restrict the transmission of torque in the power transmission device 100 that is equal to or greater than a predetermined value.

[0066] The torque limiter 3 includes a flywheel 31, a friction plate 32, a first friction material 33a, a second friction material 33b, a pressure plate 34, and a second disc spring 35 (an example of a biasing member).

[0067] <Flywheel> The flywheel 31 is attached to the crankshaft 101 by a plurality of first fastening members 5. The flywheel 31 rotates integrally with the crankshaft 101.

[0068] The flywheel 31 has a base portion 311 and a support portion 312. The support portion 312 is attached to the base portion 311 by a plurality of bolts 102. The support portion 312 rotates integrally with the base portion 311.

[0069] The base portion 311 is a disc-shaped plate with an opening in the center. The base portion 311 is attached to the crankshaft 101 by the first fastening member 5. The base portion 311 has a plurality of through holes 311a and a plurality of engagement holes 311b. The through holes 311a are arranged at intervals in the circumferential direction. The through holes 311a pass through the base portion 311 in the axial direction.

[0070] The engagement holes 311b are arranged at intervals in the circumferential direction and penetrate the base portion 311 in the axial direction.

[0071] The support portion 312 is annular and extends in the circumferential direction. The support portion 312 is disposed on a first axial side relative to the base portion 311. The support portion 312 is disposed at a distance in the axial direction relative to the base portion 311. Specifically, the inner periphery of the support portion 312 is disposed at a distance in the axial direction relative to the base portion 311. The outer periphery of the support portion 312 is in contact with the base portion 311. The outer periphery of the support portion 312 is attached to the base portion 311.

[0072] The support portion 312 has a screw hole 312a. The screw hole 312a penetrates the inner periphery of the support portion 312 in the axial direction. The screw hole 312a opens into the space between the inner periphery of the support portion 312 and the base portion 311. A second disc spring 35, which will be described later, is exposed to the first axial side through the screw hole 312a. In other words, the screw hole 312a faces the second disc spring 35 in the axial direction.

[0073] The friction plate 32, the first friction material 33a, the second friction material 33b, the pressure plate 34, and the second disc spring 35 are arranged between the base portion 311 and the support portion 312. The plate thickness of the support portion 312 is thicker than the plate thickness of the base portion 311.

[0074] <Friction plate> The friction plate 32 is an annular plate. The friction plate 32 is disposed rotatably about a rotation axis O. The friction plate 32 is disposed between a base portion 311 and a support portion 312 in the axial direction. More specifically, the friction plate 32 is sandwiched between a pressure plate 34 and the support portion 312. The friction plate 32 is frictionally engaged with the support portion 312 via a first friction material 33a. The friction plate 32 is also frictionally engaged with the pressure plate 34 via a second friction material 33b.

[0075] The friction plate 32 is attached to the input rotor 41. More specifically, the friction plate 32 is attached to the second plate 41b. The friction plate 32 is attached to the second plate 41b by the second fastening member 6. The friction plate 32 rotates integrally with the input rotor 41.

[0076] <Friction material> The first friction material 33a has an annular shape extending in the circumferential direction. The first friction material 33a is disposed on a first axial side of the friction plate 32. That is, the first friction material 33a is disposed between the friction plate 32 and the support portion 312 in the axial direction. The first friction material 33a is attached to the friction plate 32. The first friction material 33a rotates integrally with the friction plate 32.

[0077] The second friction material 33b has an annular shape extending in the circumferential direction. The second friction material 33b is disposed on a second axial side with respect to the friction plate 32. That is, the second friction material 33b is disposed between the friction plate 32 and the base portion 311 in the axial direction. More specifically, the second friction material 33b is disposed between the friction plate 32 and the pressure plate 34. The second friction material 33b is attached to the friction plate 32. The second friction material 33b rotates integrally with the friction plate 32.

[0078] <Pressure plate> The pressure plate 34 is annular and extends in the circumferential direction. The pressure plate 34 is configured to press the friction plate 32. The pressure plate 34 presses the friction plate 32 via the second friction material 33b. The pressure plate 34 is disposed between the second friction material 33b and the second disc spring 35 in the axial direction.

[0079] The pressure plate 34 is configured to rotate integrally with the base portion 311. Specifically, the pressure plate 34 has a main body portion 341 and a plurality of engaging claws 342. The main body portion 341 is annular and extends in the circumferential direction. Each engaging claw 342 extends from the inner circumferential end of the main body portion 341 to a second side in the axial direction. Each engaging claw 342 engages with a corresponding engaging hole 311b. That is, each engaging claw 342 extends within each engaging hole 311b. Therefore, the pressure plate 34 rotates integrally with the base portion 311. The pressure plate 34 is movable in the axial direction relative to the base portion 311.

[0080] <Second disc spring> The second disc spring 35 is disposed between the base portion 311 and the pressure plate 34 in the axial direction. The second disc spring 35 urges the pressure plate 34 toward the friction plate 32. That is, the second disc spring 35 urges the pressure plate 34 toward the first side in the axial direction. As a result, the friction plate 32, the first friction material 33a, and the second friction material 33b are sandwiched between the pressure plate 34 and the support portion 312.

[0081] The second disc spring 35 is annular and extends in the circumferential direction. The second disc spring 35 has an outer peripheral end and an inner peripheral end. The second disc spring 35 abuts against the base portion 311 at its outer peripheral end and against the pressure plate 34 at its inner peripheral end. The outer diameter of the second disc spring 35 is larger than the outer diameter of the pressure plate 34. Therefore, the second disc spring 35 is exposed to the first axial side through the screw hole 312a of the support portion 312. In other words, the second disc spring 35 faces the screw hole 312a in the axial direction.

[0082] <Second fastening member> The second fastening member 6 fastens the friction plate 32 and the input rotor 41. More specifically, the second fastening member 6 fastens the friction plate 32 and the second plate 41b. The second fastening member 6 is disposed so as to be exposed to the second axial side through the through hole 311a. That is, the second fastening member 6 faces the through hole 311a in the axial direction. The through hole 311a is sized so that the entire second fastening member 6 is exposed when viewed in the axial direction. That is, the entire second fastening member 6 is exposed to the second axial side through the through hole 311a. The second fastening member 6 is also exposed to the first axial side. That is, each member constituting the damper device 4 has a through hole or a notch so as not to overlap with the second fastening member 6 when viewed in the axial direction. The second fastening member 6 is, for example, a rivet.

[0083] <Manufacturing method> Next, a method for manufacturing the power transmission device 100 configured as described above will be described. First, as shown in Fig. 9, the torque limiter 3 and the damper device 4 are assembled separately. Then, the assembled torque limiter 3 and damper device 4 are combined with each other.

[0084] In detail, the friction plate 32 of the torque limiter 3 and the input rotor 41 (particularly the second plate 41b) of the damper device 4 are fastened together by the second fastening member 6. At this time, the fastening operation using the second fastening member 6 (for example, the operation of crushing the head of the second fastening member 6) is performed via the through-hole 311a formed in the base portion 311. After assembling the power transmission device 100 in this manner, the power transmission device 100 is attached to the crankshaft 101 by the first fastening member 5. The operation of screwing the first fastening member 5 into the crankshaft 101 is performed via the first through-holes 412a, 412b and the second through-hole 424.

[0085] When the power transmission device 100 manufactured as described above is used, the torque limiter function of the torque limiter 3 is activated, causing relative rotation between the torque limiter 3 and the damper device 4, resulting in misalignment between the first fastening member 5 and the through holes 412a, 412b, and 424, and misalignment between the second fastening member 6 and the through hole 311a. That is, the first fastening member 5 may not be exposed to the first axial side through the through holes 412a, 412b, and 424, and the second fastening member 6 may not be exposed to the second axial side through the through hole 311a. For this reason, when disassembling the power transmission device 100 for maintenance or the like, it is necessary to align the first fastening member 5 with the through holes 412a, 412b, and 424 and the second fastening member 6 with the through hole 311a.

[0086] 10, first, the bolt 103 is screwed into the screw hole 312a of the support portion 312, and the tip surface of the bolt 103 presses the second disc spring 35 toward the second axial direction. That is, the bolt 103 presses the second disc spring 35 in a direction away from the pressure plate 34. This releases the biasing force of the second disc spring 35 against the pressure plate 34, and also releases the pressure plate 34 from clamping the friction plate 32. As a result, the damper device 4 can be easily rotated relative to the torque limiter 3, and thus the first fastening member 5 can be aligned with the through holes 412a, 412b, 424, and the second fastening member 6 can be aligned with the through hole 311a.

[0087] [Variations] Although the embodiments of the present invention have been described above, the present invention is not limited to these, and various modifications are possible without departing from the spirit of the present invention. Note that the following modifications can basically be applied simultaneously.

[0088] (a) In the above embodiment, the first friction member 44 is disposed between the second plate 41b and the flange plate 422, but it may be disposed between the first plate 41a and the flange plate 422.

[0089] (b) In the above embodiment, the damper device 4 has the second friction member 46 , but the damper device 4 does not necessarily have to have the second friction member 46 .

[0090] (c) In the above embodiment, the first friction member 44 is configured to rotate integrally with the intermediate plate 45, but the first friction member 44 may be rotatable relative to the intermediate plate 45. Furthermore, the damper device 4 does not necessarily have to have the intermediate plate 45. [Explanation of symbols]

[0091] 3: Torque limiter 31: Flywheel 311: Base part 312: Support Department 32: Friction plate 34: Pressure plate 35: Second disc spring 4: Damper device 41: Input rotor 411a: Window section 411b: Window section 412a: 1st through hole 42: Output rotor 421: Hub 422: Flange plate 423: Storage hole 424: Second through hole 425: Support surface 426: Stopper surface 43: Elastic member 44: First friction member 441: Sliding part 442:Protrusion 442a: Inner contact surface 442b: Contact surface 442c: Contact surface 442d: Cavity 443: Engagement convex part 45: Intermediate plate 451: Engagement recess 452: Storage unit 46: Second friction member 462: Annular recess 5: First fastening member 100: Power transmission device 101: Crankshaft

Claims

1. a first rotating member having a plurality of windows; a second rotating member having a flange plate including a plurality of receiving holes and a cylindrical hub extending in an axial direction, the second rotating member being arranged to be rotatable relative to the first rotating member; a plurality of elastic members disposed in the respective windows and the respective receiving holes, elastically connecting the first rotary member and the second rotary member; a first friction member disposed radially apart from an outer peripheral surface of the hub; Equipped with the flange plate includes a plurality of support surfaces that are surfaces that face radially outward among surfaces that define the respective accommodating holes, The first friction member is an annular sliding portion disposed between the first rotating member and the flange plate and extending in a circumferential direction; a plurality of protrusions that protrude from the sliding portion in the axial direction, are disposed in the respective accommodating holes, and are supported by the respective support surfaces; having Damper device.

2. the first rotary member has a plurality of first through holes arranged in a circumferential direction, the second rotary member has a plurality of second through holes that overlap with the corresponding first through holes when viewed in the axial direction, The first friction members are disposed radially outward from the first through holes and the second through holes. The damper device according to claim 1 .

3. Each of the support surfaces has an arc shape centered on the rotation axis when viewed in the axial direction. The damper device according to claim 1 .

4. Each of the protrusions has an inner abutment surface that contacts the respective support surface; Each of the inner abutment surfaces has an arc shape centered on the rotation axis when viewed in the axial direction. The damper device according to claim 3 .

5. the flange plate includes a plurality of stopper surfaces that are surfaces that face in a circumferential direction among surfaces that define the respective accommodating holes, Each of the protrusions has a plurality of abutment surfaces that face each of the stopper surfaces in the circumferential direction. The damper device according to claim 1 .

6. Each of the protrusions has an inner abutment surface that contacts the respective support surface; Each of the abutment surfaces is spaced apart from the inner abutment surface. The damper device according to claim 5 .

7. Each of the protrusions has a cavity therein. The damper device according to claim 1 .

8. Each of the cavities extends in the axial direction, opens at a tip end of the protrusion, and closes at a base end of the protrusion. The damper device according to claim 7.

9. an intermediate plate arranged to be rotatable relative to the first rotary member and the second rotary member; the intermediate plate has a housing portion that houses each of the elastic members, the first friction member is configured to rotate integrally with the intermediate plate, The flange plate is disposed between the first friction member and the intermediate plate. The damper device according to claim 1 .

10. a second friction member configured to rotate integrally with the first rotating member; The second friction member is configured to slide against the intermediate plate. The damper device according to claim 9.

11. the intermediate plate has an engagement recess; the first friction member has an engaging protrusion that engages with the engaging recess, the second friction member has an annular recess extending in a circumferential direction on a surface facing the intermediate plate, The annular recess faces the engaging protrusion and the engaging recess. The damper device according to claim 10.

12. A power transmission device configured to be attached to a crankshaft, comprising: A torque limiter; The damper device according to claim 2; A fastening member; Equipped with The torque limiter is a flywheel having a base portion and a support portion disposed on a first axial side with a gap between the base portion and the support portion; a friction plate disposed between the base portion and the support portion; a pressure plate that presses the friction plate; a biasing member that biases the pressure plate toward the friction plate; and the fastening member is configured to fasten the base member to the crankshaft and is exposed in the axial direction through the first and second through holes. Power transmission device.

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