Torque limiter and power transmission device

Abstract

To apply a load on a friction material evenly.SOLUTION: A first side plate has an annular shape. A support plate is disposed spaced apart from the first side plate in an axial direction. The support plate has an annular shape. Each auxiliary plate is attached to the support plate. Each auxiliary plate is disposed at the radial outer side relative to the support plate. The respective auxiliary plates are arranged in an annular shape. A disc spring is disposed between the support plate and the first side plate in the axial direction. A first friction material is disposed between the support plate and the disc spring in the axial direction. The first friction material is located adjacent to the support plate and the auxiliary plates. The inner peripheral edge of the disc spring is disposed at the radial outer side relative to the outer peripheral edge of the support plate and the radial inner side relative to the outer peripheral edge of the auxiliary plate.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 first side plate, a support plate, a plurality of auxiliary plates, a disc spring, and a first friction material. The first side plate is annular. The support plate is arranged at an interval from the first side plate in the axial direction. The support plate is annular. Each auxiliary plate is attached to the support plate. Each auxiliary plate is arranged radially outside the support plate. Each auxiliary plate is arranged in an annular array. The disc spring is arranged between the support plate and the first side plate in the axial direction. The first friction material is arranged between the support plate and the disc spring in the axial direction. The first friction material is adjacent to the support plate and each auxiliary plate. The inner peripheral edge of the disc spring is arranged radially outside the outer peripheral edge of the support plate and radially inside the outer peripheral edge of each auxiliary plate.

[0007] According to this configuration, since the auxiliary plate is attached to the support plate, the first friction material can be sandwiched by the disc spring and the auxiliary plate. 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 support plate has a plurality of engagement recesses. Each engagement recess extends radially inward from the outer peripheral surface of the support plate. Each auxiliary plate has a plate main body portion and an engagement convex portion. The engagement convex portion extends radially inward from the plate main body portion. The engagement convex portion engages with the engagement recess.

[0009] The torque limiter according to the third aspect is configured as follows in the torque limiter according to the second aspect. The engagement recess and the engagement convex portion extend so as to be inclined with respect to the line connecting the center of gravity of the auxiliary plate and the rotation axis.

[0010] The torque limiter according to the fourth aspect is configured as follows in the torque limiter according to the second or third aspect. Each auxiliary plate has at least two engaging convex portions. Each engaging convex portion is arranged so as to sandwich the center of gravity of the auxiliary plate in the circumferential direction. Each engaging convex portion and each engaging concave portion extend toward the rotation axis.

[0011] The torque limiter according to the fifth aspect is configured as follows in the torque limiter according to any one of the second to fourth aspects. The first friction material has a groove portion. The groove portion is formed on the surface that contacts the support plate and the auxiliary plate. The groove portion opens radially outward. The groove portion overlaps with the boundary between the engaging concave portion and the engaging convex portion in the axial direction view.

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

[0013] The torque limiter according to the seventh aspect is the torque limiter according to any one of the second to fifth aspects, and further includes a second side plate, a pressure plate, and a second friction material. The second side plate is arranged such that a support plate, an auxiliary plate, a disc spring, and a first friction material are disposed between the second side plate and the first side plate. The second side plate is annular. The pressure plate is disposed between the disc spring and the first friction material in the axial direction. The second friction material is disposed 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 and engages with the first through hole. The second protrusion protrudes toward the second friction material side and engages with the second through hole. The first region is defined by a pair of adjacent engaging recesses in the circumferential direction and is a region where the first protrusion is formed. The second region is defined by a pair of adjacent engaging recesses in the circumferential direction and is a region where the second protrusion is formed. The first region extends linearly by being sandwiched between the pressure plate and the second side plate by 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 by a portion 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 power transmission device according to the ninth aspect includes the torque limiter according to any one of the first to eighth 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

[0016] According to the present invention, a load can be uniformly applied to the friction material.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0018] 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.

[0019] FIG. 1 is a front view of the power transmission device 100, and FIG. 2 is a sectional view taken along line II-II of FIG. 1. As shown in FIGS. 1 and 2, the power transmission device 100 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 arranged on the left side of the power transmission device 100, and the output side member is arranged on the right side of the power transmission device 100. The power transmission device 100 is configured to limit the torque transmitted between the internal combustion engine and the output side member and to attenuate torque fluctuations.

[0020] [Damper unit] The damper unit 4 is attached to the torque limiter 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.

[0021] [Input rotating body] The input rotating body 41 rotates integrally with a 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 axially immovable relative to each other.

[0022] The first plate 41a and the second plate 41b are arranged axially spaced apart from each other. The second plate 41b is arranged on the second side in the axial direction with respect to the first plate 41a.

[0023] The first plate 41a and the second plate 41b each have a plurality of window portions 411a, 411b. In the present embodiment, the first plate 41a and the second plate 41b each have four window portions 411a, 411b, but the number thereof is not limited to this.

[0024] 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.

[0025] <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.

[0026] 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.

[0027] The hub 421 is cylindrical and is arranged in 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.

[0028] 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 so as to be relatively rotatable with respect 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.

[0029] 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 to this. The 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 arranged at a position overlapping with each of the window portions 411a and 411b in the axial direction view.

[0030] <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.

[0031] 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.

[0032] [Torque limiter] As shown in FIG. 2, the torque limiter 3 is rotatably arranged about the rotation axis O. The torque limiter 3 is arranged 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.

[0033] 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 of a predetermined value or more in the power transmission device 100.

[0034] The torque limiter 3 has a first side plate 31, a second side plate 32, a support plate 33, a plurality of auxiliary plates 34, a first friction material 35a, a second friction material 35b, a pressure plate 36, and a disc spring 37.

[0035] <First side plate and second side plate> The first side plate 31 and the second side plate 32 are attached to the flywheel. The first side plate 31 and the second side plate 32 rotate integrally with the flywheel. The first side plate 31 and the second side plate 32 are annular. 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. A support plate 33, each auxiliary plate 34, a first friction material 35a, a second friction material 35b, a pressure plate 36, and a disc spring 37 are arranged between the first side plate 31 and the second side plate 32. The plate thickness of the second side plate 32 is thicker than the plate thickness of the first side plate 31.

[0036] <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.

[0037] 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 a 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.

[0038] FIG. 3 is a front view of the support plate 33. As shown in FIG. 3, the support plate 33 has a plurality of engagement recesses 335. Each engagement recess 335 extends radially inward from the outer peripheral surface of the support plate 33. The tip of each engagement recess 335 is disposed radially inward of the inner peripheral edge of the first friction material 35a (see FIG. 10). Each engagement recess 335 opens radially outward. The engagement recess 335 is formed in the outer peripheral portion of the support plate 33. The engagement recess 335 penetrates the support plate 33 in the axial direction. The engagement recesses 335 are arranged at intervals in the circumferential direction.

[0039] 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.

[0040] The first protrusion 331 protrudes toward the first friction material 35a side. That is, the first protrusion 331 protrudes toward the first side in the axial direction. The first protrusion 331 engages with a first through hole 351a of the first friction material 35a described later.

[0041] The second protrusion 332 protrudes toward the second friction material 35b side. That is, the second protrusion 332 protrudes toward the second side in the axial direction. The second protrusion 332 engages with a second through hole 351b of the second friction material 35b described later.

[0042] 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 engagement recesses 335 in the circumferential direction. The first protrusion 331 is formed in the first region 333. That is, among the regions between a pair of adjacent engagement recesses 335 in the circumferential direction, the region in which the first protrusion 331 is formed is the first region 333.

[0043] 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.

[0044] 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.

[0045] As shown in FIG. 3, the second region 334 is defined by a pair of engaging recesses 335 adjacent to each other in the circumferential direction. A second protrusion 332 is formed in the second region 334. That is, among the regions between a pair of engaging recesses 335 adjacent to each other in the circumferential direction, the region in which the second protrusion 332 is formed is the second region 334.

[0046] 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 engaging recess 335. Only the first protrusion 331 or only the second protrusion 332 is formed in the region between the pair of engaging recesses 335. That is, both the first protrusion 331 and the second protrusion 332 are not formed in one region.

[0047] 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 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 easier to fit the second protrusion 332 of the support plate 33 into the second through hole 351b of the second friction material 35b.

[0048] 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.

[0049] <Auxiliary plate> Fig. 6 is a front view showing each auxiliary plate 34 attached to the support plate 33. As shown in Fig. 6, each auxiliary plate 34 is arranged radially outside the support plate 33. Each auxiliary plate 34 is attached to the support plate 33. Each auxiliary plate 34 rotates integrally with the support plate 33.

[0050] In the present embodiment, the torque limiter 3 has six auxiliary plates 34. Each auxiliary plate 34 is arranged in an annular shape. That is, each auxiliary plate 34 is arranged in the circumferential direction. Each auxiliary plate 34 is arranged at intervals in the circumferential direction. Note that each auxiliary plate 34 may be in contact with each other.

[0051] Figure 7 is a front view of the auxiliary plate 34. As shown in Figure 7, the auxiliary plate 34 has a plate main body portion 342 and a plurality of engaging convex portions 343. In this embodiment, the auxiliary plate 34 has four engaging convex portions 343. The plate main body portion 342 extends in the circumferential direction. The plate main body portion 342 is in an arc shape centered on the rotation axis O.

[0052] The engaging convex portion 343 extends radially inward from the plate main body portion 342. The engaging convex portions 343 are arranged at intervals in the circumferential direction. The engaging convex portion 343 engages with the engaging concave portion 335. The directions in which the engaging convex portion 343 and the engaging concave portion 335 extend are the same. The shape of the engaging convex portion 343 is substantially the same as the shape of the engaging concave portion 335. By the engaging convex portion 343 engaging with the engaging concave portion 335, the auxiliary plate 34 is attached to the support plate 33.

[0053] The engaging convex portion 343 extends so as to be inclined with respect to the line L connecting the center of gravity G of the auxiliary plate 34 and the rotation axis O. The engaging concave portion 335 also extends in the same way. Therefore, even when the power transmission device 100 rotates and a centrifugal force acts on the auxiliary plate 34, the engaging convex portion 343 is caught by the inner wall surface of the engaging concave portion 335, and it is possible to prevent the auxiliary plate 34 from moving radially outward and coming off the support plate 33.

[0054] Each engaging convex portion 343 extends toward the rotation axis O. The engaging concave portion 335 also extends in the same way. The plurality of engaging convex portions 343 are arranged so as to sandwich the center of gravity G of the auxiliary plate 34 in the circumferential direction. In this embodiment, two engaging convex portions 343 are arranged on the right side with respect to the center of gravity G, and the remaining two engaging convex portions 343 are arranged on the left side with respect to the center of gravity G. Thereby, it is possible to more reliably prevent the auxiliary plate 34 from moving radially outward and coming off the support plate 33.

[0055] <Friction material> As shown in FIG. 2, the first friction material 35a is disposed axially between the support plate 33 and the pressure plate 36. The first friction material 35a is axially adjacent to the support plate 33 and the auxiliary plate 34.

[0056] The first friction material 35a has a first through hole 351a. The first through hole 351a axially penetrates the first friction material 35a. 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.

[0057] The first friction material 35a is annular. The first friction material 35a extends across the support plate 33 and the auxiliary plate 34. That is, in the axial view, it overlaps both the support plate 33 and the auxiliary plate 34. The inner diameter of the first friction material 35a is smaller than the outer diameter of the support plate 33. The outer diameter of the first friction material 35a is larger than the outer diameter of the support plate 33. Also, the outer diameter of the first friction material 35a is equal to or less than the outer diameter of the auxiliary plate 34. In this embodiment, the outer diameter of the first friction material 35a is substantially the same as the outer diameter of the auxiliary plate 34. Also, the outer diameter of the auxiliary plate 34 means the length from the rotation axis O to the outer peripheral edge of the auxiliary plate 34.

[0058] FIG. 8 is a front view of the first friction material 35a viewed from the second side in the axial direction, and FIG. 9 is a view taken along the line IX-IX in FIG. 8. As shown in FIGS. 8 and 9, the first friction material 35a has a plurality of groove portions 352a. Each groove portion 352a is arranged at intervals in the circumferential direction. Each groove portion 352a is arranged at the same pitch as each engaging convex portion 343. The width of the groove portion 352a is larger than the width of the engaging convex portion 343. Here, the widths of the groove portion 352a and the engaging convex portion 343 mean the dimensions in the circumferential direction. Each groove portion 352a extends in the radial direction. Each groove portion 352a opens radially outward.

[0059] Each groove portion 352a is formed on the surface of the first friction material 35a that contacts the support plate 33 and the auxiliary plate 34 among the two surfaces of the first friction material 35a. That is, each groove portion 352a is formed on the surface of the first friction material 35a that faces the second side in the axial direction among the two surfaces of the first friction material 35a. Each groove portion 352a does not penetrate the first friction material 35a in the axial direction.

[0060] FIG. 10 is a front view of the torque limiter 3. As shown in FIG. 10, in the axial view, the groove portion 352a overlaps with the boundary between the engagement recess 335 and the engagement protrusion 343. Thereby, when water accumulates in the gap between the engagement recess 335 and the engagement protrusion 343, the water can be discharged to the outside through the groove portion 352a. Preferably, in the axial view, the groove portion 352a overlaps with the root portion of the engagement protrusion 343.

[0061] As shown in FIG. 2, 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 and the auxiliary plate 34 in the axial direction.

[0062] 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 second protrusion 332 of the support plate 33 engaging with the second through hole 351b of the second friction material 35b. The second friction material 35b rotates integrally with the support plate 33.

[0063] The second friction material 35b is annular. The second friction material 35b extends across the support plate 33 and the auxiliary plate 34. That is, in the axial direction view, it overlaps both the support plate 33 and the auxiliary plate 34. The inner diameter of the second friction material 35b is smaller than the outer diameter of the support plate 33. The outer diameter of the second friction material 35b is larger than the outer diameter of the support plate 33. Also, the outer diameter of the second friction material 35b is equal to or less than the outer diameter of the auxiliary plate 34. In this embodiment, the outer diameter of the second friction material 35b is substantially the same as the outer diameter of the auxiliary plate 34.

[0064] <Pressure plate> The pressure plate 36 is annular. The pressure plate 36 is disposed axially between the disc spring 37 and the support plate 33. Specifically, 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.

[0065] 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.

[0066] <Disc spring> The disc spring 37 is disposed axially between the support plate 33 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.

[0067] The disc spring 37 is annular. As shown in Fig. 11, the disc spring 37 is taken together with the support plate 33 from a single plate. Therefore, the inner diameter of the disc spring 37 is equal to or greater than the outer diameter of the support plate 33. Also, the plate thickness of the disc spring 37 is the same as that of the support plate 33.

[0068] In addition to the disc spring 37 and the support plate 33, a plurality of auxiliary plates 34 are also taken together. The plurality of auxiliary plates 34 are taken out from the area surrounded by the support plate 33. Fig. 11 is a plan view showing a single plate from which the support plate 33, the disc spring 37, and the plurality of auxiliary plates 34 are taken out.

[0069] As shown in Fig. 2, the disc spring 37 abuts against the first side plate 31 at its outer peripheral end and abuts against the pressure plate 36 at its inner peripheral end. The inner peripheral edge of the disc spring 37 is arranged radially outside the outer peripheral edge of the support plate 33. Also, the inner peripheral edge of the disc spring 37 is arranged radially inside the outer peripheral edge of the auxiliary plate 34. That is, the disc spring 37 overlaps with the auxiliary plate 34 in the axial view. Therefore, a uniform load can be applied to the first friction material 35a.

[0070] [Modification Example] As described above, the embodiments of the present invention have been explained, but 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.

[0071] For example, the first friction material 35a and the second friction material 35b may be attached to the auxiliary plate 34 instead of the support plate 33. Also, the first friction material 35a and the second friction material 35b may be attached to the support plate 33 or the auxiliary plate 34 by other means such as an adhesive.

Explanation of Reference Numerals

[0072] 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: Engaging recess 34: Auxiliary plate 342: Plate main body 343: Engaging protrusion 35a: First friction material 351a: First through hole 352a: Groove portion 35b: Second friction material 351b: Second through hole 36: Pressure plate 37: Disc spring 4: Damper unit 41: Input rotating body 42: Output rotating body 43: Elastic member 100: Power transmission device

Claims

1. An annular first side plate, An annular support plate arranged at an axial distance from the first side plate, A plurality of auxiliary plates attached to the support plate, arranged radially outside the support plate, and arranged in an annular array, A disc spring arranged axially between the support plate and the first side plate, A first friction material arranged axially between the support plate and the disc spring and adjacent to the support plate and each auxiliary plate, Comprising, The inner peripheral edge of the disc spring is arranged radially outside the outer peripheral edge of the support plate and radially inside the outer peripheral edge of each auxiliary plate, A torque limiter.

2. The support plate has a plurality of engaging recesses extending radially inward from the outer peripheral surface, Each auxiliary plate has a plate main body portion and an engaging convex portion extending radially inward from the plate main body portion and engaging with the engaging recess, The torque limiter according to Claim 2.

3. The engaging recess and the engaging convex portion extend so as to be inclined with respect to the line connecting the center of gravity of the auxiliary plate and the rotation axis, The torque limiter according to Claim 2.

4. Each auxiliary plate has at least two engaging convex portions arranged so as to sandwich the center of gravity of each auxiliary plate in the circumferential direction, Each engaging convex portion and each engaging recess extend toward the rotation axis, The torque limiter according to Claim 2.

5. The first friction material has a groove portion opening radially outward on the surface in contact with the support plate and each auxiliary plate, The groove portion overlaps with the boundary between the engaging recess and the engaging convex portion in the axial view, The torque limiter according to Claim 2.

6. An annular second side plate arranged such that the support plate, each auxiliary plate, the disc spring, and the first friction material are arranged between the first side plate, A pressure plate arranged axially between the disc spring and the first friction material, A second friction material arranged axially between the support plate and the second side plate, Further comprising, The torque limiter according to Claim 1.

7. An annular second side plate arranged such that the support plate, each auxiliary plate, the disc spring, and the first friction material are arranged between the first side plate, A pressure plate disposed between the disc spring and the first friction material in the axial direction; A second friction material disposed between the support plate and the second side plate in the axial direction; further comprising; 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 protruding toward the first friction material side and engaging with the first through-hole, a second protrusion protruding toward the second friction material side and engaging with the second through-hole, a first region defined by a pair of adjacent engaging recesses in the circumferential direction and in which the first protrusion is formed, and a second region defined by a pair of adjacent engaging recesses in the circumferential direction and in which the second protrusion is formed; In the first region, a portion bent toward the first friction material side is sandwiched between the pressure plate and the second side plate and extends linearly; In the second region, a portion bent toward the second friction material side is sandwiched between the pressure plate and the second side plate and extends linearly; The torque limiter according to claim 2.

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

9. The 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 damper unit having; A power transmission device comprising.

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