Damper device and power transmission device

Abstract

To provide a damper device which can be made compact.SOLUTION: The damper device includes a first rotary member, a second rotary member, an elastic member and a first friction member. The first rotary member includes a plurality of first through holes arranged in the circumferential direction. The second rotary member has a plurality of second through holes. Each second through-hole overlaps the corresponding first through-hole in the axial view. The second rotary member is disposed to be rotatable relative to the first rotary member. The elastic member elastically couples the first rotary member and the second rotary member. The first friction member is disposed between the first rotary member and the second rotary member. The first friction member is configured to slide with the first rotary member on a radially inner side of each of the first through holes and each of the second through holes. The first friction member is configured to unitarily rotate with the second rotary member.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] The power transmission device is configured to absorb torque fluctuations of the engine. This power transmission device has a flywheel, a torque limiter, and a damper device (see, for example, Patent Document 1). The damper device is attached to the flywheel via the torque limiter. The torque limiter is configured to restrict transmission of torque above a predetermined value between the flywheel and the damper device. [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] In the damper device as described above, there is a demand for a more compact size in the radial direction. Therefore, an object of the present invention is to provide a damper device that can be made compact. [Means for solving the problem]

[0005] A damper device according to a first aspect includes a first rotating member, a second rotating member, an elastic member, and a first friction member. The first rotating member has a plurality of first through holes arranged in the circumferential direction. The second rotating member has a plurality of second through holes. Each second through hole overlaps a corresponding first through hole when viewed in the axial direction. The second rotating member is arranged to be rotatable relative to the first rotating member. The elastic member elastically connects the first rotating member and the second rotating member. The first friction member is arranged between the first rotating member and the second rotating member. The first friction member is configured to slide with the first rotating member radially inward of each of the first through holes and each of the second through holes. The first friction member is configured to rotate integrally with the second rotating member.

[0006] The inventors have devised a method of manufacturing a power transmission device by assembling a damper device, a torque limiter, and a flywheel, and then attaching the assembled power transmission device to a crankshaft. To attach the power transmission device to the crankshaft, the flywheel is fastened to the crankshaft with bolts. To pass the bolts through, it is necessary to form through holes in the first and second rotating members of the damper device. When through holes are formed in the first and second rotating members, the damper device must be made larger in the radial direction to prevent interference between the friction member and the through holes.

[0007] In contrast, in the damper device according to the first aspect, the first friction material is configured to slide radially inward relative to each of the first through holes and each of the second through holes, which allows the damper device to be made more compact in the radial direction.

[0008] A damper device according to a second aspect is the damper device according to the first aspect, and is configured as follows: The first friction member is attached to the second rotating member radially outward from the center of the second through hole.

[0009] A damper device according to a third aspect is the damper device according to the first or second aspect, and is configured as follows: The first friction member has a sliding portion and a plurality of arm portions. The sliding portion is annular. The sliding portion is arranged radially inward with respect to each of the first through holes and each of the second through holes. The sliding portion is configured to slide with the first rotating member. Each arm portion extends radially outward from the sliding portion. The arm portions are arranged at intervals from each other in the circumferential direction. Each arm portion is attached at its tip to the second rotating member.

[0010] A damper device according to a fourth aspect is the damper device according to the third aspect, and is configured as follows: The second rotating member has a plurality of engagement holes. Each engagement hole is disposed radially outward from the center of each second through hole. Each arm portion has an engagement protrusion at its tip. Each engagement protrusion protrudes in the axial direction so as to engage with the corresponding engagement hole.

[0011] A damper device according to a fifth aspect is the damper device according to the third or fourth aspect, and is configured as follows: Each arm portion extends in the radial direction between adjacent second through holes.

[0012] A damper device according to a sixth aspect is the damper device according to any one of the first to fifth aspects, and is configured as follows: The first rotating member has a first plate and a second plate spaced apart in the axial direction. The second rotating member has a hub and a flange plate. The hub extends in the axial direction. The flange plate extends radially outward from the hub. The flange plate is arranged between the first plate and the second plate in the axial direction. The first friction member is arranged between the first plate and the flange plate. The first friction member slides against the first plate. The first friction member rotates integrally with the flange plate.

[0013] A damper device according to a seventh aspect is the damper device according to the sixth aspect, further comprising a second friction member. The second friction member is disposed between the second plate and the flange plate. The second friction member slides against the second plate. The second friction member rotates integrally with the flange plate.

[0014] A damper device according to an eighth aspect is the damper device according to the sixth or seventh aspect, further comprising a disc spring. The disc spring biases the first friction member toward the first plate. The hub has a hub body portion, an annular protrusion, and a plurality of teeth. The hub body portion is cylindrical. The annular protrusion protrudes radially outward from the hub body portion. The annular protrusion extends in the circumferential direction. Each tooth protrudes radially outward from the annular protrusion. The flange plate has a plurality of tooth grooves. Each tooth engages with a corresponding tooth groove. The disc spring abuts against the annular protrusion and the first friction member.

[0015] A power transmission device according to a ninth aspect is configured to be attached to a crankshaft. The power transmission device includes a torque limiter, a damper device according to any one of the first to eighth aspects, and a fastening member. The torque limiter has a flywheel, a friction plate, a pressure plate, and a biasing 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 biasing member biases 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]

[0016] According to the present invention, the damper device can be made compact. [Brief explanation of the drawings]

[0017] [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] FIG. [Figure 5]FIG. [Figure 6] FIG. 2 is a front view of the damper device with some components removed. [Figure 7] FIG. 3 is a cross-sectional view of the power transmission device before assembly. [Figure 8] 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

[0018] 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.

[0019] 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.

[0020] [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, a first disc spring 45 (an example of a disc spring), and a second friction member 46.

[0021] <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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] <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.

[0030] 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.

[0031] 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.

[0032] Fig. 3 is a front view of the damper device 4 with the first plate 41a, the first friction member 44, etc. removed. As shown in Figs. 2 and 3, the hub 421 has a hub main body 421a, an annular protrusion 421b, and a plurality of teeth 421c. The hub main body 421a, the annular protrusion 421b, and the plurality of teeth 421c are integrally formed by a single member.

[0033] Hub main body 421a is cylindrical. Hub main body 421a extends in the axial direction. Annular protrusion 421b protrudes radially outward from the outer circumferential surface of hub main body 421a. Annular protrusion 421b is annular and extends circumferentially.

[0034] The teeth 421c are spaced apart from one another in the circumferential direction. The teeth 421c are formed on the annular protrusion 421b. Specifically, the teeth 421c protrude radially outward from the outer circumferential surface of the annular protrusion 421b. The annular protrusion 421b is thicker than the teeth 421c. Here, the thickness of the annular protrusion 421b and the teeth 421c refers to the axial dimension.

[0035] The flange plate 422 extends radially from the outer peripheral surface of the hub 421. The flange plate 422 is formed in an annular shape. The flange plate 422 is arranged 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.

[0036] 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.

[0037] 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.

[0038] The flange plate 422 has a plurality of tooth grooves 422a. Each tooth 421c is configured to engage with each tooth groove 422a.

[0039] The flange plate 422 has a plurality of engagement holes 422b. Each engagement hole 422b is disposed radially outward with respect to the center of each second through hole 424. Each engagement hole 422b is disposed between a pair of second through holes 424 adjacent to each other in the circumferential direction. When viewed in the radial direction, each engagement hole 422b is disposed so as not to overlap with a corresponding second through hole 424. When viewed in the radial direction, each engagement hole 422b is disposed so as to overlap with a corresponding tooth 421c.

[0040] <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.

[0041] The elastic member 43 is housed in the housing hole 423 of the output rotor 42. The elastic member 43 is housed in the window 411a of the first plate 41a and also in the window 411b of the second plate 41b.

[0042] <First friction member> Fig. 4 is an enlarged cross-sectional view of the power transmission device 100. As shown in Fig. 4, the first friction member 44 is disposed axially between the input rotor 41 and the output rotor 42. In detail, the first friction member 44 is disposed axially between the first plate 41a and the flange plate 422.

[0043] The first friction member 44 slides against the first plate 41a on the radially inner side of each of the first through holes 412a and each of the second through holes 424. The first friction member 44 is configured to rotate integrally with the output rotor 42. More specifically, the first friction member 44 rotates integrally with the flange plate 422.

[0044] Fig. 5 is a perspective view of the first friction member 44, and Fig. 6 is a front view of the damper device 4 with the first plate 41a and the like removed. As shown in Figs. 5 and 6, the first friction member 44 has a sliding portion 441 and a plurality of arm portions 442. In this embodiment, the first friction member 44 has three arm portions 442.

[0045] The sliding portion 441 has an annular shape extending in the circumferential direction. The sliding portion 441 is disposed radially inward relative to each of the first through holes 412a and each of the second through holes 424. The sliding portion 441 is not exposed to the first axial side from each of the first through holes 412a. The sliding portion 441 is configured to slide against the first plate 41a. The sliding portion 441 has a friction material 443 (see FIG. 4) on the surface that slides against the first plate 41a. Note that the sliding portion 441 does not necessarily have to have the friction material 443. The inner circumferential surface of the sliding portion 441 faces the outer circumferential surface of the hub main body 421a. The sliding portion 441 is disposed radially spaced apart from the outer circumferential surface of the hub main body 421a, but may abut against the outer circumferential surface of the hub main body 421a.

[0046] Sliding portion 441 has a step portion 444. More specifically, the outer periphery of sliding portion 441 is thicker than other portions, and the difference in thickness forms step portion 444. Note that the thickness of sliding portion 441 refers to the dimension in the axial direction.

[0047] Each arm portion 442 extends radially outward from the sliding portion 441. Each arm portion 442 is thinner than the sliding portion 441, but may have the same thickness as the sliding portion 441. The arm portions 442 are arranged at intervals in the circumferential direction. Each arm portion 442 extends radially between a pair of second through holes 424 adjacent to each other in the circumferential direction.

[0048] The tip of each arm 442 is attached to the flange plate 422. Each arm 442 has an engaging protrusion 442a at its tip. Each engaging protrusion 442a protrudes toward the second axial side. Each engaging protrusion 442a engages with a corresponding engaging hole 422b. In other words, the first friction member 44 is attached to the flange plate 422 radially outward from the center of the second through hole 424.

[0049] <First disc spring> 4, the first disc spring 45 biases the first friction member 44 toward the first plate 41a. The first disc spring 45 is disposed axially between the annular protrusion 421b of the hub 421 and the first friction member 44. Specifically, an inner peripheral end of the first disc spring 45 abuts against the annular protrusion 421b of the hub 421. An outer peripheral end of the first disc spring 45 abuts against the first friction member 44.

[0050] The outer peripheral surface of the first disc spring 45 abuts against the step portion 444 of the first friction member 44. That is, the first disc spring 45 abuts against the step portion 444, thereby being positioned in the radial direction.

[0051] <Second friction member> The second friction member 46 is disposed between the second plate 41b and the flange plate 422 in the axial direction. The second friction member 46 slides against the second plate 41b on the radially inner side of each of the first through holes 412b and each of the second through holes 424. The second friction member 46 has a friction material 461 on the surface that slides against the second plate 41b. Note that the sliding portion 441 does not necessarily have to have the friction material 461.

[0052] The second friction member 46 is configured to rotate integrally with the output rotor 42. More specifically, the second friction member 46 rotates integrally with the flange plate 422. The second friction member 46 abuts against the annular protrusion 421b. That is, the second friction member 46 is sandwiched between the second plate 41b and the annular protrusion 421b in the axial direction.

[0053] The second friction member 46 has the same shape as the first friction member 44. That is, the second friction member 46 has an annular sliding portion and a plurality of arm portions. Unlike the first friction member 44, the second friction member 46 does not have a stepped portion. That is, the outer peripheral end of the second friction member 46 has the same thickness as the other portions. Engagement protrusions formed at the tip of each arm portion of the second friction member 46 protrude toward the first side in the axial direction.

[0054] The arms of the second friction member 46 are arranged so as not to overlap with the arms 442 of the first friction member 44 when viewed in the axial direction. That is, the arms 442 of the first friction member 44 and the arms of the second friction member 46 are arranged alternately in the circumferential direction. In addition, in the flange plate 422, the engagement holes 422b for the first friction member 44 and the engagement holes 422b for the second friction member 46 are arranged alternately in the circumferential direction.

[0055] [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.

[0056] 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.

[0057] 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).

[0058] <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.

[0059] 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.

[0060] 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.

[0061] The engagement holes 311b are arranged at intervals in the circumferential direction and penetrate the base portion 311 in the axial direction.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] <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.

[0066] 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.

[0067] <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.

[0068] 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.

[0069] <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.

[0070] 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.

[0071] <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.

[0072] 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.

[0073] <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.

[0074] <Manufacturing method> Next, a method for manufacturing the power transmission device 100 configured as described above will be described. First, as shown in Fig. 7, 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.

[0075] 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.

[0076] 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.

[0077] 8, 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 sandwiching 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.

[0078] [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.

[0079] (a) In the above embodiment, the first friction member 44 is attached to the output rotor 42, but it may also be attached to the input rotor 41. That is, the first friction member 44 may slide against the output rotor 42. In this case, the output rotor 42 is an example of a first rotor, and the input rotor 41 is an example of a second rotor. In this case, the hub 421 and the flange plate 422 are preferably integrally formed by a single member.

[0080] (b) In the above embodiment, the first friction member 44 is disposed between the first plate 41a and the flange plate 422, but the first friction member 44 may also be disposed between the second plate 41b and the flange plate 422. [Explanation of symbols]

[0081] 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 41a: First plate 412a: 1st through hole 41b: Second plate 412b: 1st through hole 42: Output rotor 421: Hub 421a: Hub body 421b: Annular protrusion 421c: teeth 422: Flange plate 422a: Tooth groove 422b: Engagement hole 424: Second through hole 43: Elastic member 44: First friction member 441: Sliding part 442: Arm 442a: Engagement convex part 45: First disc spring 46: Second friction member 5: First fastening member 100: Power transmission device 101: Crankshaft

Claims

1. a first rotating member having a plurality of first through holes arranged in a circumferential direction; a second rotary member having a plurality of second through holes that overlap with the corresponding first through holes in an axial view, the second rotary member being arranged to be rotatable relative to the first rotary member; an elastic member that elastically connects the first rotary member and the second rotary member; a first friction member disposed between the first rotary member and the second rotary member, sliding on the first rotary member at a radially inner side relative to each of the first through holes and each of the second through holes, and configured to rotate integrally with the second rotary member; A damper device comprising:

2. The first friction member is attached to the second rotating member radially outward from the center of the second through hole. The damper device according to claim 1 .

3. The first friction member is an annular sliding portion disposed radially inward with respect to each of the first through holes and each of the second through holes and configured to slide against the first rotating member; a plurality of arm portions extending radially outward from the sliding portion, arranged at intervals in the circumferential direction, and attached at their tip ends to the second rotating member; having The damper device according to claim 1 .

4. the second rotary member has a plurality of engagement holes arranged radially outward from the centers of the second through holes, Each arm portion has an engaging protrusion at its tip end that protrudes in the axial direction so as to engage with each engaging hole. The damper device according to claim 3 .

5. Each arm portion extends radially between adjacent second through holes. The damper device according to claim 3 .

6. the first rotating member has a first plate and a second plate spaced apart in the axial direction; the second rotating member has a hub extending in the axial direction, and a flange plate extending radially outward from the hub and disposed axially between the first plate and the second plate, the first friction member is disposed between the first plate and the flange plate, slides on the first plate, and rotates integrally with the flange plate; The damper device according to claim 1 .

7. a second friction member disposed between the second plate and the flange plate; the second friction member slides against the second plate and rotates integrally with the flange plate; The damper device according to claim 6.

8. a disc spring that biases the first friction member toward the first plate; The hub includes: a cylindrical hub body; an annular protrusion protruding radially outward from the hub body and extending circumferentially; a plurality of teeth projecting radially outward from the annular projection; and The flange plate has a plurality of tooth grooves into which the teeth engage, the disc spring abuts against the annular protrusion and the first friction member; The damper device according to claim 6.

9. A power transmission device configured to be attached to a crankshaft, comprising: A torque limiter; The damper device according to any one of claims 1 to 8, 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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