Torque limiter and power transmission device

Abstract

To provide a torque limiter which can apply a load to a friction material evenly.SOLUTION: A torque limiter includes a support plate, a disc spring, and a first friction material. The support plate has an annular shape. The support plate has a plurality of recessed parts. Each recessed part extends from an outer peripheral surface to the radial inner side. The respective recessed parts are arranged at an interval in a circumferential direction. The disc spring has a base part and a plurality of protruding parts. The base part has an annular shape. The protruding parts protrude from the base part to the radial inner side. The first friction material is disposed between the support plate and the disc spring in an axial direction. The first friction material is overlapped with the protruding parts and the support plate in an axial view.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[0002] In order to prevent the transmission of excessive torque, a power transmission device having a torque limiter has been proposed. For example, the power transmission device disclosed in Patent Document 1 includes a damper unit and a torque limiter. The torque limiter has a clutch composed of a plurality of plates, and the clutch slips to prevent the transmission of excessive torque. The torque limiter has a support plate for supporting a friction material and a disc spring for pressing the clutch.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] From the viewpoint of cost reduction, it is preferable to take out the support plate and the disc spring from the same single plate, so-called co-taking. However, since both the support plate and the disc spring are annular, when the support plate and the disc spring are taken out from a single plate by co-taking, the support plate and the disc spring do not overlap each other in the axial direction view. For this reason, a uniform load cannot be applied to the friction material disposed between the support plate and the disc spring.

[0005] An object of the present invention is to provide a torque limiter capable of uniformly applying a load to a friction material.

Means for Solving the Problems

[0006] The torque limiter according to the first aspect includes a support plate, a disc spring, and a first friction material. The support plate is annular. The support plate has a plurality of recesses. Each recess extends radially inward from the outer peripheral surface. The recesses are arranged at intervals in the circumferential direction. The disc spring has a base portion and a plurality of convex portions. The base portion is annular. Each convex portion projects radially inward from the base portion. The first friction material is disposed axially between the support plate and the disc spring. The first friction material overlaps each convex portion and the support plate in an axial view.

[0007] According to this configuration, the convex portion of the disc spring and the support plate can sandwich the first friction material. As a result, a uniform load can be applied to the first friction material.

[0008] The torque limiter according to the second aspect is configured as follows in the torque limiter according to the first aspect. The tip of at least one recess is disposed radially inward with respect to the inner peripheral edge of the first friction material. According to this configuration, when water accumulates on the inner peripheral surface of the first friction material, it can be drained through the recesses.

[0009] The torque limiter according to the third aspect further includes a pressure plate in the torque limiter according to the first or second aspect. The pressure plate is disposed axially between the first friction material and the disc spring. Each convex portion has a contact portion that contacts the pressure plate. The contact portion is disposed radially outward with respect to the tip of the convex portion.

[0010] The torque limiter according to the fourth aspect is configured as follows in the torque limiter according to the third aspect. The contact portion is configured by bending the convex portion axially.

[0011] The torque limiter according to the fifth aspect is configured as follows in the torque limiter according to any one of the first to fourth aspects. The inner diameter of the base portion is equal to or greater than the outer diameter of the support plate.

[0012] The torque limiter according to the sixth aspect is the torque limiter according to any one of the first to fifth aspects, and further includes a first side plate, a second side plate, a pressure plate, and a second friction material. The first side plate is annular. A support plate, a disc spring, and a first friction material are arranged between the first side plate and the second side plate. The second side plate is annular. The pressure plate is arranged between the disc spring and the first friction material in the axial direction. The second friction material is arranged between the support plate and the second side plate in the axial direction.

[0013] The torque limiter according to the seventh aspect is the torque limiter according to any one of the first to sixth aspects, and further includes a first side plate, a second side plate, a pressure plate, and a second friction material. The first side plate is annular. A support plate, a disc spring, and a first friction material are arranged between the first side plate and the second side plate. The second side plate is annular. The pressure plate is arranged between the disc spring and the first friction material in the axial direction. The second friction material is arranged between the support plate and the second side plate in the axial direction. The first friction material has a first through hole penetrating in the axial direction. The second friction material has a second through hole penetrating in the axial direction. The support plate has a first protrusion, a second protrusion, a first region, and a second region. The first protrusion protrudes toward the first friction material side. The first protrusion engages with the first through hole. The second protrusion protrudes toward the second friction material side. The second protrusion engages with the second through hole. The first region is defined by a pair of adjacent recesses in the circumferential direction. The first protrusion is formed in the first region. The second region is defined by a pair of adjacent recesses in the circumferential direction. The second protrusion is formed in the second region. The first region extends linearly by being sandwiched between the pressure plate and the second side plate by what is bent toward the first friction material side. The second region extends linearly by being sandwiched between the pressure plate and the second side plate by what is bent toward the second friction material side.

[0014] The torque limiter according to the eighth aspect is configured as follows in the torque limiter according to any one of the first to seventh aspects. The disc spring has the same plate thickness as the support plate.

[0015] The torque limiter according to the ninth aspect is configured as follows in the torque limiter according to any one of the first to eighth aspects. Each convex portion is arranged radially inward with respect to the outer peripheral edge of the support plate.

[0016] The power transmission device according to the tenth aspect includes the torque limiter according to any one of the first to ninth aspects and a damper unit. The damper unit has an input rotating body, an output rotating body, and an elastic member. The input rotating body is configured to rotate integrally with the support plate. The elastic member elastically connects the input rotating body and the output rotating body.

Advantages of the Invention

[0017] According to the present invention, a load can be uniformly applied to the friction material.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0019] Hereinafter, the torque limiter 3 and 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 torque limiter 3 and 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 left side in FIG. 2, and the second axial side means the right side in FIG. 2.

[0020] FIG. 1 is a front view of the power transmission device 100, and FIG. 2 is a sectional view taken along line II-II in FIG. 1. As shown in FIGS. 1 and 2, the power transmission device 100 has a torque limiter 3 and a damper unit 4. The torque limiter 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.

[0021] [Damper Unit] The damper unit 4 is attached to the torque limiter 3. The damper unit 4 is configured to attenuate rotational fluctuations. The damper unit 4 has an input rotating body 41, an output rotating body 42, and an elastic member 43.

[0022] [Input Rotating Body] The input rotating body 41 rotates integrally with the support plate 33 of the torque limiter 3 described later. The input rotating body 41 has a first plate 41a and a second plate 41b. Both the first plate 41a and the second plate 41b are annular members having a central hole. The first plate 41a and the second plate 41b rotate integrally with each other. Also, the first plate 41a and the second plate 41b are immovable relative to each other in the axial direction.

[0023] The first plate 41a and the second plate 41b are arranged at intervals in the axial direction. The second plate 41b is arranged on the second side in the axial direction with respect to the first plate 41a.

[0024] 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 thereof is not limited thereto.

[0025] Each of the window portions 411a, 411b is arranged at intervals in the circumferential direction. Each of the window portions 411a, 411b is configured to accommodate the elastic member 43.

[0026] <Output rotating body> The output rotating body 42 is configured to transmit the torque from the input rotating body 41 to the output side member. The output rotating body 42 is arranged between the first plate 41a and the second plate 41b in the axial direction. The output rotating body 42 is arranged so as to be relatively rotatable with respect to the first plate 41a and the second plate 41b.

[0027] The output rotating body 42 has a hub 421 and a flange plate 422. The hub 421 and the flange plate 422 are integrally formed as one member, but may be configured as separate members.

[0028] The hub 421 is cylindrical and 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 peripheral portion of the hub 421. The input shaft of the output side member can be spline-fitted into this spline hole.

[0029] 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 disposed so as to be relatively rotatable with respect to the first plate 41a and the second plate 41b. The flange plate 422 is disposed axially between the first plate 41a and the second plate 41b.

[0030] The flange plate 422 has a plurality of accommodation holes 423. In this embodiment, the flange plate 422 has four accommodation holes 423, but the number is not limited thereto. The respective accommodation holes 423 are arranged at intervals in the circumferential direction. Each accommodation hole 423 is configured to accommodate the elastic member 43. Each accommodation hole 423 is disposed at a position overlapping the respective window portions 411a, 411b in an axial view.

[0031] <Elastic member> 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 is, for example, a coil spring.

[0032] The elastic member 43 is accommodated in the accommodation hole 423 of the output rotating body 42. Further, the elastic member 43 is accommodated in the window portion 411a of the first plate 41a and also in the window portion 411b of the second plate 41b.

[0033] [Torque limiter] As shown in FIG. 2, the torque limiter 3 is disposed so as to be rotatable about the rotation axis O. The torque limiter 3 is disposed on the second side in the axial direction with respect to the flywheel. The torque limiter 3 is annular. The torque limiter 3 is attached to the flywheel.

[0034] The torque limiter 3 is configured to limit the torque transmitted between the flywheel and the damper unit 4. That is, the torque limiter 3 is configured to regulate the transmission of torque equal to or greater than a predetermined value in the power transmission device 100.

[0035] The torque limiter 3 has a first side plate 31, a second side plate 32, a support plate 33, a first friction material 35a, a second friction material 35b, a pressure plate 36, and a disc spring 37.

[0036] <The first side plate and the 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. The second side plate 32 is arranged at an axial interval with respect to the first side plate 31. The second side plate 32 is arranged on the second axial side with respect to the first side plate 31. Between the first side plate 31 and the second side plate 32, a support plate 33, a first friction material 35a, a second friction material 35b, a pressure plate 36, and a disc spring 37 are arranged. The plate thickness of the second side plate 32 is thicker than the plate thickness of the first side plate 31.

[0037] <Support plate> The support plate 33 is an annular plate. The support plate 33 is arranged to be rotatable about the rotation axis O. The support plate 33 is arranged at an axial interval from the first side plate 31.

[0038] The support plate 33 is attached to the input rotating body 41. Specifically, the support plate 33 is attached to the first plate 41a. For example, the support plate 33 is attached to the first plate 41a by the fastening member 101. The support plate 33 rotates integrally with the input rotating body 41. Although the support plate 33 is a separate member from the first plate 41a, the support plate 33 may be integrally configured as one member with the first plate 41a.

[0039] FIG. 3 is a front view of the support plate 33. As shown in FIG. 3, the support plate 33 has a plurality of recesses 335. Each recess 335 extends radially inward from the outer peripheral surface of the support plate 33. Each recess 335 opens radially outward. The recesses 335 are formed in the outer peripheral portion of the support plate 33. The recesses 335 penetrate the support plate 33 in the axial direction. The recesses 335 are arranged at intervals in the circumferential direction.

[0040] As shown in FIGS. 2 and 3, the support plate 33 has a plurality of first protrusions 331 and a plurality of second protrusions 332. The first protrusions 331 and the second protrusions 332 are alternately arranged in the circumferential direction.

[0041] The first protrusion 331 protrudes toward the first friction material 35a. That is, the first protrusion 331 protrudes toward the first side in the axial direction. The first protrusion 331 engages with the first through hole 351a of the first friction material 35a described later.

[0042] The second protrusion 332 protrudes toward the second friction material 35b. That is, the second protrusion 332 protrudes toward the second side in the axial direction. The second protrusion 332 engages with the second through hole 351b of the second friction material 35b described later.

[0043] As shown in FIG. 3, the support plate 33 has a plurality of first regions 333 and a plurality of second regions 334. The first region 333 is defined by a pair of adjacent recesses 335 in the circumferential direction. A first protrusion 331 is formed in the first region 333. That is, among the regions between a pair of adjacent recesses 335 in the circumferential direction, the region where the first protrusion 331 is formed is the first region 333.

[0044] FIG. 4 is a cross-sectional view of the torque limiter 3 before assembly, and FIG. 5 is a cross-sectional view of the torque limiter 3 after assembly. As shown in FIG. 4, in the state before assembling the torque limiter 3, that is, before applying an axial load to the support plate 33, the first region 333 is bent toward the first friction material 35a side. That is, the first region 333 is bent toward the first side in the axial direction. For this reason, it becomes easier to fit the first protrusion 331 of the support plate 33 into the first through hole 351a of the first friction material 35a.

[0045] As shown in FIG. 5, when the torque limiter 3 is assembled, that is, when the first side plate 31 is fastened to the second side plate 32 by a plurality of rivets 102, the support plate 33 including the first region 333 is sandwiched between the second side plate 32 and the pressure plate 36. As a result, an axial load is applied to the support plate 33 including the first region 333, and the first region 333 that was bent in the axial direction extends linearly in the radial direction.

[0046] As shown in FIG. 3, the second region 334 is defined by a pair of adjacent recesses 335 in the circumferential direction. A second protrusion 332 is formed in the second region 334. That is, among the regions between a pair of adjacent recesses 335 in the circumferential direction, the region where the second protrusion 332 is formed is the second region 334.

[0047] The first region 333 and the second region 334 are alternately arranged in the circumferential direction. The first region 333 and the second region 334 are separated by the recess 335. In the region between a pair of recesses 335, only the first protrusion 331 or only the second protrusion 332 is formed. That is, both the first protrusion 331 and the second protrusion 332 are not formed in one region.

[0048] As shown in FIG. 4, in the state before assembling the torque limiter 3, that is, in the state before applying an axial load to the support plate 33, the second region 334 is bent toward the second friction material 35b side. That is, the second region 334 is bent toward the second side in the axial direction. For this reason, it becomes easy to fit the second protrusion 332 of the support plate 33 into the second through hole 351b of the second friction material 35b.

[0049] As shown in FIG. 5, when the torque limiter 3 is assembled, that is, when the first side plate 31 is fastened to the second side plate 32 by a plurality of rivets 102, the support plate 33 including the second region 334 is sandwiched between the second side plate 32 and the pressure plate 36. As a result, an axial load is applied to the support plate 33 including the second region 334, and the second region 334 that was bent in the axial direction extends linearly in the radial direction.

[0050] <Friction material> As shown in FIG. 2, the first friction material 35a is annular. The first friction material 35a is disposed between the support plate 33 and the disc spring 37 in the axial direction. Specifically, the first friction material 35a is disposed between the support plate 33 and the pressure plate 36 in the axial direction. The first friction material 35a is adjacent to the support plate 33 in the axial direction.

[0051] The first friction material 35a has a first through-hole 351a. The first through-hole 351a penetrates the first friction material 35a in the axial direction. The first friction material 35a is attached to the support plate 33. Specifically, the first friction material 35a is attached to the support plate 33 by the engagement of the first protrusion 331 of the support plate 33 with the first through-hole 351a of the first friction material 35a. The first friction material 35a rotates integrally with the support plate 33.

[0052] The second friction material 35b is annular. The second friction material 35b is disposed between the support plate 33 and the second side plate 32 in the axial direction. The second friction material 35b is adjacent to the support plate 33 in the axial direction.

[0053] The second friction material 35b has a second through-hole 351b. The second through-hole 351b penetrates the second friction material 35b in the axial direction. The second friction material 35b is attached to the support plate 33. Specifically, the second friction material 35b is attached to the support plate 33 by the engagement of the second protrusion 332 of the support plate 33 with the second through-hole 351b of the second friction material 35b. The second friction material 35b rotates integrally with the support plate 33.

[0054] FIG. 6 is a front view of the support plate 33 to which the first friction material 35a is attached. As shown in FIG. 6, the tip portions (radially inner ends) of the respective recesses 335 of the support plate 33 are disposed radially inward with respect to the inner peripheral edge of the first friction material 35a. Thereby, when water accumulates on the inner peripheral surface of the first friction material 35a, the water can be discharged to the outside through the respective recesses 335. Note that the same applies to the second friction material 35b. That is, the tip portions of the respective recesses 335 of the support plate 33 are disposed radially inward with respect to the inner peripheral edge of the second friction material 35b.

[0055] <Pressure plate> As shown in FIG. 2, the pressure plate 36 is annular. The pressure plate 36 is disposed axially between the first friction material 35a and the disc spring 37. The inner diameter of the pressure plate 36 is smaller than the inner diameter of the first friction material 35a. Also, the outer diameter of the pressure plate 36 is larger than the outer diameter of the first friction material 35a. That is, the pressure plate 36 can press the entire surface of the first friction material 35a.

[0056] The pressure plate 36 is configured to rotate integrally with the second side plate 32. Note that the pressure plate 36 is axially movable relative to the second side plate 32.

[0057] <Disc spring> The disc spring 37 is disposed axially between the first friction material 35a and the first side plate 31. Specifically, the disc spring 37 is disposed axially between the first side plate 31 and the pressure plate 36. The disc spring 37 biases the pressure plate 36 axially toward the second side. That is, the disc spring 37 biases the pressure plate 36 toward the support plate 33. Thereby, the support plate 33, the first friction material 35a, and the second friction material 35b are sandwiched by the pressure plate 36 and the second side plate 32.

[0058] The disc spring 37 is annular. The disc spring 37 abuts on the first side plate 31 at its outer peripheral end and abuts on the pressure plate 36 at its inner peripheral end.

[0059] FIG. 7 is a front view of the disc spring 37. As shown in FIG. 7, the disc spring 37 has a base portion 371 and a plurality of convex portions 372. The base portion 371 is annular. The inner diameter of the base portion 371 is equal to or larger than the outer diameter of the support plate 33. In the present embodiment, the inner diameter of the base portion 371 is substantially the same as the outer diameter of the support plate 33. Note that the inner diameter of the disc spring 37 means the inner diameter of the base portion 371. Also, the outer diameter of the disc spring 37 means the outer diameter of the base portion 371.

[0060] Each convex portion 372 protrudes radially inward from the base portion 371. Therefore, each convex portion 372 is disposed radially inward with respect to the outer peripheral edge of the support plate 33. Note that each convex portion 372 has substantially the same shape as each concave portion 335. The convex portions 372 are arranged at intervals in the circumferential direction.

[0061] FIG. 8 is a plan view showing a single plate from which the support plate 33 and the disc spring 37 are removed. As shown in FIG. 8, the disc spring 37 is removed together with the support plate 33 from a single plate. Therefore, the inner diameter of the disc spring 37 (the inner diameter of the base portion 371) is equal to or greater than the outer diameter of the support plate 33. In this embodiment, the inner diameter of the disc spring 37 is substantially the same as the outer diameter of the support plate 33. Also, the plate thickness of the disc spring 37 is the same as the plate thickness of the support plate 33. Each concave portion 335 is formed by forming each convex portion 372. Therefore, each concave portion 335 and each convex portion 372 have substantially the same shape.

[0062] FIG. 9 is an enlarged cross-sectional view of the torque limiter 3. As shown in FIG. 9, the convex portion 372 has a contact portion 373. The contact portion 373 is a portion that contacts the pressure plate 36. The contact portion 373 is disposed radially outward with respect to the tip portion 374 of the convex portion 372. The contact portion 373 is configured by bending the convex portion 372 in the axial direction. Specifically, the contact portion 373 is configured by bending the convex portion 372 in a direction away from the pressure plate 36. Note that the tip portion 374 of the convex portion 372 does not contact the pressure plate 36. That is, the tip portion 374 is disposed at an interval from the pressure plate 36 in the axial direction.

[0063] The first friction material 35a overlaps with each convex portion 372 and also overlaps with the support plate 33 when viewed in the axial direction. Each convex portion 372 is arranged so as to press the first friction material 35a radially inward with respect to the outer peripheral edge of the support plate 33. Therefore, even when the support plate 33 and the disc spring 37 are taken together, the first friction material 35a is firmly sandwiched between the support plate 33 and the disc spring 37, and the disc spring 37 can uniformly apply a load to the first friction material 35a. Note that each convex portion 372 presses the first friction material 35a via the pressure plate 36.

[0064] [Modification Example] As described above, the embodiments of the present invention have been described. However, 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 modification examples can basically be applied simultaneously.

[0065] (a) In the above embodiment, the torque limiter 3 is used together with the damper unit 4, but the torque limiter 3 can also be used alone.

[0066] (b) The first friction material 35a may be attached to the pressure plate 36 instead of the support plate 33. Similarly, the second friction material 35b may be attached to the second side plate 32 instead of the support plate 33.

[0067] (c) The tip portion 374 of the disc spring 37 may be in contact with the pressure plate 36.

[0068] (d) The tip portion of each recess 335 does not have to be arranged radially inward with respect to the inner peripheral edge of the first friction material 35a. That is, the tip portion of each recess 335 may be arranged radially outward with respect to the inner peripheral edge of the first friction material 35a. In this case, the tip portion 374 of the disc spring 37 may be in contact with the pressure plate 36.

Description of Reference Numerals

[0069] 3: Torque limiter 31: First side plate 32: Second side plate 33: Support plate 331: First protrusion 332: Second protrusion 333: First region 334: Second region 335: Recess 35a: First friction material 351a: First through hole 35b: Second friction material 351b: Second through hole 36: Pressure plate 37: Disc spring 371: Base portion 372: Protrusion 373: Contact portion 374: Tip portion 4: Damper unit 41: Input rotating body 42: Output rotating body 43: Elastic member 100: Power transmission device

Claims

1. An annular support plate having a plurality of recesses extending radially inward from an outer peripheral surface and spaced apart from each other in a circumferential direction, a disc spring having an annular base portion and a plurality of convex portions protruding radially inward from the base portion, a first friction material disposed axially between the support plate and the disc spring, comprising: the first friction material overlapping the respective convex portions and the support plate in an axial view, a torque limiter.

2. The tip of at least one of the recesses is disposed radially inward of an inner peripheral edge of the first friction material, The torque limiter according to claim 1.

3. further comprising a pressure plate disposed axially between the first friction material and the disc spring, each of the convex portions having a contact portion that contacts the pressure plate, the contact portion being disposed radially outward of a tip of the convex portion, The torque limiter according to claim 1.

4. The contact portion is configured by bending the convex portion axially, The torque limiter according to claim 3.

5. The inner diameter of the base portion is equal to or greater than the outer diameter of the support plate, The torque limiter according to claim 1.

6. an annular first side plate, an annular second side plate disposed such that the support plate, the disc spring, and the first friction material are disposed therebetween and the first side plate, a pressure plate disposed axially between the disc spring and the first friction material, a second friction material disposed axially between the support plate and the second side plate, further comprising: The torque limiter according to claim 1.

7. an annular first side plate, an annular second side plate disposed such that the support plate, the disc spring, and the first friction material are disposed therebetween and the first side plate, a pressure plate disposed axially between the disc spring and the first friction material, a second friction material disposed axially between the support plate and the second side plate, further comprising: the first friction material having a first through hole penetrating axially, the second friction material having a second through hole penetrating axially, The support plate has a first protruding portion that protrudes toward the first friction material side and engages with the first through hole, a second protruding portion that protrudes toward the second friction material side and engages with the second through hole, a first region defined by a pair of adjacent recesses in the circumferential direction where the first protruding portion is formed, and a second region defined by a pair of adjacent recesses in the circumferential direction where the second protruding portion is formed. The first region extends linearly by being sandwiched between the pressure plate and the second side plate with a portion bent toward the first friction material side. The second region extends linearly by being sandwiched between the pressure plate and the second side plate with a portion bent toward the second friction material side. The torque limiter according to claim 1.

8. The disc spring has the same plate thickness as the support plate. The torque limiter according to claim 1.

9. Each of the convex portions is disposed radially inward with respect to the outer peripheral edge of the support plate. The torque limiter according to claim 1.

10. A torque limiter according to any one of claims 1 to 8, An input rotating body configured to rotate integrally with the support plate, an output rotating body, and an elastic member that elastically connects the input rotating body and the output rotating body. A power transmission device comprising the same.

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