Power transmission device and torque limiter

Abstract

Provided is a power transmission device and a torque limiter that can be made less expensive. The power transmission device includes a drive plate and a torque limiter. The torque limiter includes a first side plate, an inertial member, a friction plate, a pressure plate, and an urging member. The first side plate is disposed on a first side in an axial direction with respect to the drive plate. The first side plate is configured to rotate integrally with the drive plate. The inertial member is disposed on the first side in the axial direction with respect to the first side plate. The inertial member is configured to rotate integrally with the first side plate. The friction plate is configured to be able to rotate in opposition to the first side plate. The pressure plate cooperates with the first side plate to sandwich the friction plate. The urging member urges the pressure plate in the axial direction toward the first side plate.

Description

Technical Field

[0001] This invention relates to power transmission devices and torque limiters. Background Technology

[0002] The power transmission device disclosed in Patent Document 1 includes a flywheel, a torque limiter, and a vibration damping unit. The flywheel has an inertia ring. The torque limiter is mounted on the inertia ring.

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2024-030506 Summary of the Invention

[0004] The technical problem that the invention aims to solve The technical problem of the present invention is to provide a power transmission device that can achieve low cost.

[0005] Solutions for solving technical problems The power transmission device according to the first embodiment includes a drive plate and a torque limiter. The drive plate is configured to receive torque from a prime mover. The torque limiter is configured to be mounted on the drive plate. The torque limiter includes a first side plate, an inertial member, a friction plate, a pressure plate, and a force-applying member. The first side plate is disposed on a first side in the axial direction relative to the drive plate. The first side plate is configured to rotate integrally with the drive plate. The inertial member is disposed on a first side in the axial direction relative to the first side plate. The inertial member is configured to rotate integrally with the first side plate. The friction plate is configured to rotate relative to the first side plate. The pressure plate cooperates with the first side plate to clamp the friction plate. The force-applying member applies axial force to the pressure plate toward the first side plate.

[0006] According to this structure, the inertial member is disposed on the first side of the axial direction relative to the first side plate. That is, the inertial member is not disposed between the drive plate and the first side plate, but is disposed at a position offset from the torque transmission path from the drive plate to the first side plate. Therefore, it is not necessary to firmly fix the inertial member to the first side plate, and cost reduction can be achieved compared to the case where the inertial member is disposed within the torque transmission path.

[0007] The power transmission device according to the second embodiment is configured in the same manner as the power transmission device according to the first embodiment. The torque limiter has a second side plate. The second side plate is disposed on a first side in the axial direction relative to the first side plate. A friction plate, a pressure plate, and a force-applying member are disposed axially between the first and second side plates. An inertial member is clamped axially by the first and second side plates.

[0008] The power transmission device according to the third embodiment is configured in the same manner as the power transmission device according to the first or second embodiment. A first side plate has an annular portion and a cylindrical portion. The annular portion extends circumferentially. The cylindrical portion extends axially from the outer peripheral end of the annular portion to a first side. An inertial member is configured to overlap with the cylindrical portion when viewed radially. The inertial member is configured to overlap with the annular portion when viewed axially.

[0009] The power transmission device according to the fourth embodiment is configured as follows, in contrast to the power transmission device according to the third embodiment: The torque limiter has a second side plate. The second side plate is disposed on a first side in the axial direction relative to the first side plate. The second side plate has an outer peripheral surface that abuts against the inner peripheral surface of the cylindrical portion.

[0010] The power transmission device according to the fifth embodiment is configured as follows, in contrast to the power transmission device according to the fourth embodiment: The outer peripheral surface of the second side plate has an abutting portion and a non-abutting portion. The abutting portion extends in an arc shape when viewed axially. The abutting portion abuts against the inner peripheral surface of the cylindrical portion. The non-abutting portion extends in a straight line when viewed axially. The non-abutting portion does not abut against the inner peripheral surface of the cylindrical portion.

[0011] The power transmission device involved in the sixth embodiment is configured as follows, in any of the power transmission devices involved in the first to fifth embodiments: A first side plate has a first bulge. The first bulge protrudes axially to a first side. An inertial member is disposed radially outward relative to the first bulge.

[0012] The power transmission device according to the seventh embodiment is configured in the same manner as the power transmission device according to the sixth embodiment. The torque limiter has a second side plate. The second side plate is disposed on a first side in the axial direction relative to the first side plate. The second side plate has a second bulge. The second bulge protrudes towards a second side in the axial direction. The second bulge abuts against the first bulge in the axial direction. An inertial member is disposed radially outward relative to the first and second bulges.

[0013] The power transmission device involved in the eighth embodiment is configured as follows, in any of the power transmission devices involved in the first to seventh embodiments: The inertial member has a threaded hole extending axially.

[0014] The power transmission device involved in the ninth embodiment is configured as follows, in any of the power transmission devices involved in the first to eighth embodiments: The inertial member is an annular shape extending circumferentially. The thickness of the inertial member plate is greater than the thickness of the first side plate.

[0015] The power transmission device involved in the tenth embodiment is configured as follows, in any of the power transmission devices involved in the first to ninth embodiments: the inertial member is a nut that is thicker than the thickness of the first side plate.

[0016] The power transmission device according to the eleventh embodiment, in addition to the power transmission devices according to any one of the first to tenth embodiments, includes a vibration damping unit. The vibration damping unit has a first rotating member, a second rotating member, and an elastic member. The first rotating member is configured to rotate integrally with the friction plate. The second rotating member is configured to rotate relative to the first rotating member. The elastic member elastically connects the first rotating member and the second rotating member.

[0017] The torque limiter involved in the twelfth embodiment is configured to be mounted on a drive plate, which is configured to receive torque from a prime mover. The torque limiter includes a first side plate, an inertial member, a friction plate, a pressure plate, and a force-applying member. The first side plate is disposed on a first side in the axial direction relative to the drive plate. The first side plate is configured to rotate integrally with the drive plate. The inertial member is disposed on a first side in the axial direction relative to the first side plate. The inertial member is configured to rotate integrally with the first side plate. The friction plate is configured to rotate relative to the first side plate. The pressure plate cooperates with the first side plate to clamp the friction plate. The force-applying member applies axial force to the pressure plate toward the first side plate.

[0018] Invention Effects According to the present invention, a power transmission device that can achieve low cost can be provided. Attached Figure Description

[0019] Figure 1 This is the front view of the power transmission device.

[0020] Figure 2 yes Figure 1 Sectional view along line II-II.

[0021] Figure 3 This is an enlarged sectional view of the power transmission device.

[0022] Figure 4 This is the front view of the power transmission device in the modified example.

[0023] Figure 5 yes Figure 4 VV-line sectional view.

[0024] Figure 6 This is a cross-sectional view of the power transmission device involved in the modified example. Detailed Implementation

[0025] Hereinafter, the torque limiter 3 and the power transmission device 100 of this embodiment will be described with reference to the accompanying drawings. It should be noted that, in the following description, axial direction refers to the direction in which the rotation axis O of the torque limiter 3 and the power transmission device 100 extends. Furthermore, circumferential direction refers to the circumferential direction of the circle centered on the rotation axis O, and radial direction refers to the radial direction of the circle centered on the rotation axis O. Additionally, axial direction first side refers to... Figure 2 The right side, the second side of the axis refers to Figure 2 On the left side.

[0026] Figure 1 This is the front view of the power transmission device 100. Figure 2 yes Figure 1 Sectional view along line II-II. (See also...) Figure 1 as well as Figure 2 As shown, the power transmission device 100 includes a drive plate 110, a torque limiter 3, and a vibration damping unit 4. The drive plate 110 and the torque limiter 3 are configured to rotate integrally with each other. The torque limiter 3 and the vibration damping unit 4 can rotate relative to each other, but they rotate substantially integrally with each other. When the torque transmitted to the power transmission device 100 exceeds a predetermined value, the torque limiter 3 and the vibration damping unit 4 rotate relative to each other.

[0027] The power transmission device 100 is disposed between the prime mover (not shown) and the output-side component (not shown). The prime mover, for example, refers to an internal combustion engine. The output-side component, for example, refers to an electric motor or a transmission. The internal combustion engine is positioned on the second axial side relative to the power transmission device 100. Figure 2 (on the left side), the output side component is arranged on the first side of the axial direction relative to the power transmission device 100 ( Figure 2 (Right side). The power transmission device 100 is configured to limit the torque transmitted between the internal combustion engine and the output-side component, and to attenuate torque fluctuations.

[0028] [Driver Board] The drive plate 110 is configured to receive torque from the prime mover. Specifically, the drive plate 110 is mounted to the crankshaft (not shown) for example by a plurality of bolts 111. The drive plate 110 has a plurality of through holes 110a. The through holes 110a are arranged at intervals in the circumferential direction. The drive plate 110 is in the shape of a circular plate.

[0029] [Vibration Damping Unit] The vibration damping unit 4 is mounted on the torque limiter 3. The vibration damping unit 4 is configured to attenuate rotational fluctuations. The vibration damping unit 4 has a first rotating member 41, a second rotating member 42, and a plurality of elastic members 43.

[0030] <First Rotating Component> The first rotating member 41 rotates integrally with the friction plate 33 of the torque limiter 3 (described later). The first rotating member 41 has a first plate 41a and a second plate 41b. Both the first plate 41a and the second plate 41b are annular members with a central hole. The first plate 41a and the second plate 41b rotate integrally with each other. In addition, the first plate 41a and the second plate 41b cannot move relative to each other in the axial direction.

[0031] The first plate 41a and the second plate 41b are arranged axially spaced apart from each other. The second plate 41b is arranged on a second side axially relative to the first plate 41a.

[0032] The first plate 41a and the second plate 41b each have a plurality of windows 411a and 411b. In addition, in this embodiment, the first plate 41a and the second plate 41b each have four windows 411a and 411b, but their number is not limited to this.

[0033] The windows 411a and 411b are arranged at intervals in the circumferential direction. Each window 411a and 411b is configured to accommodate an elastic member 43.

[0034] The outer peripheral surface 412 of the first rotating member 41 abuts against the inner peripheral surface of the cylindrical portion 312, which will be described later. Furthermore, the outer peripheral surface 412 of the first rotating member 41 is formed by the outer peripheral surface of at least one of the first plate 41a and the second plate 41b. The outer peripheral surface 412 of the first rotating member 41 has a plurality of abutting portions 412a and a plurality of non-abutting portions 412b. In this embodiment, the outer peripheral surface 412 of the first rotating member 41 has four abutting portions 412a and four non-abutting portions 412b.

[0035] The abutting portion 412a extends in an arc shape when viewed axially. The abutting portion 412a abuts against the inner circumferential surface of the cylindrical portion 312. The non-abutting portion 412b extends in a straight line when viewed axially. The non-abutting portion 412b does not abut against the inner circumferential surface of the cylindrical portion 312.

[0036] The outer periphery of the first rotating member 41 is disposed radially outward relative to the outer periphery of the friction plate 33. When viewed axially, the outer periphery of the first rotating member 41 overlaps with the fastening member 37 (described later). Furthermore, when viewed axially, the outer periphery of the first rotating member 41 overlaps with the inertial member 36 (described later). The outer periphery of the first rotating member 41 is disposed on a first axial side relative to the torque limiter 3.

[0037] <Second Rotating Component> The second rotating member 42 is configured to transmit torque from the first rotating member 41 to the output-side member. The second rotating member 42 is axially disposed between the first plate 41a and the second plate 41b. The second rotating member 42 is configured to be able to rotate relative to the first plate 41a and the second plate 41b.

[0038] The second rotating member 42 has a hub 421 and a flange plate 422. The hub 421 and the flange plate 422 are configured as different members, but they can also be integrally formed as a single member.

[0039] The hub 421 is cylindrical and extends axially. The hub 421 is disposed within the central holes of the first plate 41a and the second plate 41b. An axially extending spline hole is formed on the inner circumference of the hub 421. The input shaft of the output-side component can engage with this spline hole.

[0040] A 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 configured to rotate relative to the first plate 41a and the second plate 41b. The flange plate 422 is axially disposed between the first plate 41a and the second plate 41b.

[0041] The flange plate 422 has a plurality of receiving holes 423. Furthermore, in this embodiment, the flange plate 422 has four receiving holes 423, but the number is not limited to this. The receiving holes 423 are arranged at intervals from each other in the circumferential direction. Each receiving hole 423 is configured to receive an elastic member 43. Each receiving hole 423 is positioned to overlap with each window portion 411a, 411b when viewed axially.

[0042] <Elastic Components> The elastic member 43 is configured to elastically connect the first rotating member 41 and the second rotating member 42 in the rotational direction. The elastic member 43 is, for example, a helical spring.

[0043] The elastic member 43 is housed in the receiving hole 423 of the second rotating member 42. In addition, the elastic member 43 is housed in the window portion 411a of the first plate 41a and also in the window portion 411b of the second plate 41b.

[0044] [Torque Limiter] The torque limiter 3 is configured to rotate about the rotation axis O. The torque limiter 3 is positioned on the first axial side relative to the drive plate 110. The torque limiter 3 is annular. The torque limiter 3 is configured to be mounted on the drive plate 110.

[0045] The torque limiter 3 is configured to limit the torque transmitted between the drive plate 110 and the damping unit 4. That is, the torque limiter 3 is configured to limit the transmission of torque exceeding a predetermined value in the power transmission device 100.

[0046] The torque limiter 3 has a first side plate 31, a second side plate 32, a friction plate 33, a pressure plate 34, a force-applying member 35, and an inertial member 36.

[0047] <First Side Panel> The first side plate 31 is disposed on a first side in the axial direction relative to the drive plate 110. The first side plate 31 is mounted on the drive plate 110. Specifically, the first side plate 31 has a plurality of through holes 310. The through holes 310 are arranged at intervals in the circumferential direction. The through holes 310 open on a second side in the axial direction. Each through hole 310 is configured to communicate with a corresponding through hole 110a of the drive plate 110.

[0048] Multiple bolts 112 fasten the drive plate 110, the first side plate 31, and the inertial member 36. The bolts 112 pass through the through holes 110a in the drive plate 110 and 310 in the first side plate 31. The first side plate 31 rotates integrally with the drive plate 110. The first side plate 31 is annular. The thickness of the first side plate 31 is greater than that of the drive plate 110.

[0049] Figure 3 This is an enlarged sectional view of the power transmission device 100. (For example...) Figure 3 As shown, the first side plate 31 has an annular portion 311 and a cylindrical portion 312. The annular portion 311 and the cylindrical portion 312 are integrally formed from a single component.

[0050] The annular portion 311 is annular in shape, extending circumferentially. The annular portion 311 has a first bulge 311a, a first inner circumferential portion 311b, and a first outer circumferential portion 311c. The first bulge 311a bulges axially. The first bulge 311a bulges in the same direction as the cylindrical portion 312. That is, the first bulge 311a bulges towards a first axial direction. Compared to other portions of the annular portion 311, the first bulge 311a bulges towards a first axial direction. The first bulge 311a extends circumferentially.

[0051] The first inner peripheral portion 311b is disposed radially inward relative to the first bulge portion 311a. The first inner peripheral portion 311b is in contact with the friction plate 33.

[0052] The first outer peripheral portion 311c is disposed radially outward relative to the first bulge 311a. The first outer peripheral portion 311c abuts against the inertial member 36. In addition, the first outer peripheral portion 311c abuts against the drive plate 110. That is, the first outer peripheral portion 311c is held between the drive plate 110 and the inertial member 36.

[0053] The cylindrical portion 312 extends axially from the outer peripheral end of the annular portion 311. More specifically, the cylindrical portion 312 extends axially towards a first side from the outer peripheral end of the annular portion 311. That is, the cylindrical portion 312 extends axially from the outer peripheral end of the annular portion 311 away from the drive plate 110. Furthermore, the cylindrical portion 312 can be formed by bending the outer peripheral portion of the first side plate 31 axially. The first side plate 31 can be formed by sheet metal processing or stamping.

[0054] <Second Side Panel> The second side plate 32 is disposed on the first side of the axial direction relative to the first side plate 31. A friction plate 33, a pressure plate 34, and a force-applying member 35 are disposed between the first side plate 31 and the second side plate 32 in the axial direction. The thickness of the second side plate 32 is thinner than that of the first side plate 31.

[0055] The second side plate 32 is configured to rotate integrally with the first side plate 31. The second side plate 32 is fastened to the first side plate 31 by a plurality of fastening members 37. The fastening members 37 are arranged at intervals in the circumferential direction. The fastening members 37 are, for example, rivets.

[0056] The second side plate 32 has a second bulge 321, a second inner peripheral portion 322, and a second outer peripheral portion 323. The second bulge 321 bulges out axially. The second bulge 321 bulges in the opposite direction to the first bulge 311a. That is, the second bulge 321 bulges out to a second side axially. That is, the second bulge 321 bulges toward the first bulge 311a.

[0057] The second bulge 321 extends circumferentially. The second bulge 321 abuts against the first bulge 311a in the axial direction. The fastening member 37 fastens the first bulge 311a and the second bulge 321.

[0058] The second inner circumferential portion 322 is disposed radially inward relative to the second bulge portion 321. The second inner circumferential portion 322 supports the force-applying member 35. The second inner circumferential portion 322 is disposed axially spaced from the first inner circumferential portion 311b. A friction plate 33, a pressure plate 34, and a force-applying member 35 are disposed axially between the first inner circumferential portion 311b and the second inner circumferential portion 322.

[0059] The second outer peripheral portion 323 is disposed radially outward relative to the second bulge 321. The second outer peripheral portion 323 is disposed axially spaced from the first outer peripheral portion 311c. An inertial member 36 is disposed between the first outer peripheral portion 311c and the second outer peripheral portion 323 in the axial direction. The second outer peripheral portion 323 abuts against the inertial member 36.

[0060] The outer peripheral surface 324 of the second side plate 32 abuts against the inner peripheral surface of the cylindrical portion 312. For example... Figure 1 As shown, the outer peripheral surface 324 of the second side plate 32 has a plurality of abutting portions 324a and a plurality of non-abutting portions 324b. Furthermore, in this embodiment, the outer peripheral surface 324 of the second side plate 32 has four abutting portions 324a and four non-abutting portions 324b.

[0061] The abutting portion 324a extends in an arc shape when viewed axially. The abutting portion 324a abuts against the inner circumferential surface of the cylindrical portion 312. The non-abutting portion 324b extends in a straight line when viewed axially. The non-abutting portion 324b does not abut against the inner circumferential surface of the cylindrical portion 312.

[0062] <Friction Plate> like Figure 2 and Figure 3 As shown, the friction plate 33 is an annular plate extending circumferentially. The friction plate 33 is configured to rotate about the rotation axis O. The friction plate 33 is configured to rotate relative to the first side plate 31.

[0063] The friction plate 33 abuts against the first side plate 31 in the axial direction. More specifically, the friction plate 33 abuts against the first inner peripheral portion 311b of the annular portion 311 in the axial direction. The friction plate 33 is configured to engage with the first side plate 31 through friction.

[0064] Friction plate 33 is mounted on the first rotating member 41. More specifically, friction plate 33 is mounted on the second plate 41b. For example, friction plate 33 is mounted on the second plate 41b by fastening member 113. Friction plate 33 rotates integrally with the first rotating member 41. Furthermore, friction plate 33 is a different member from the second plate 41b, but friction plate 33 may also be integrally formed with the second plate 41b as a single member.

[0065] The friction plate 33 has a main body portion 331, a first friction member 332, and a second friction member 333. The main body portion 331 is annular, extending circumferentially. The first friction member 332 is mounted on a first axial side surface of the main body portion 331. The second friction member 333 is mounted on a second axial side surface of the main body portion 331. The first friction member 332 and the second friction member 333 rotate integrally with the main body portion 331. The first friction member 332 and the second friction member 333 are annular. The first friction member 332 and the second friction member 333 are mounted on the outer periphery of the main body portion 331.

[0066] <Pressure plate> The pressure plate 34 is annular. The pressure plate 34 is axially positioned between the force-applying member 35 and the friction plate 33. The pressure plate 34 cooperates with the first side plate 31 to clamp the friction plate 33. The first side plate 31 and the pressure plate 34 abut against the first friction member 332 and the second friction member 333.

[0067] The pressure plate 34 is configured to rotate integrally with the first side plate 31. Furthermore, the pressure plate 34 is axially movable relative to the first side plate 31. Specifically, the pressure plate 34 has a plurality of protrusions 341 projecting radially outward (see reference). Figure 2 The pressure plate 34 engages with the engagement hole 313 formed on the first side plate 31 through the protrusion 341, and rotates integrally with the first side plate 31 in a state in which it can move axially relative to the first side plate 31.

[0068] <Force-applying component> The force-applying member 35 is axially positioned between the second side plate 32 and the pressure plate 34. The force-applying member 35 applies force to the pressure plate 34 towards the second axial direction. That is, the force-applying member 35 applies force to the pressure plate 34 towards the first side plate 31. As a result, the friction plate 33 is clamped between the pressure plate 34 and the first side plate 31. The force-applying member 35 is annular, extending circumferentially. The force-applying member 35 is, for example, a disc spring. The force-applying member 35 abuts against the second inner circumferential portion 322 at its outer circumferential end and against the pressure plate 34 at its inner circumferential end.

[0069] <Inertial Components> The inertial member 36 is annular, extending circumferentially. The thickness of the inertial member 36 is greater than that of the first side plate 31. Furthermore, the thickness of the inertial member 36 refers to its axial dimension. The inertial member 36 is disposed on a first axial side relative to the first side plate 31. The inertial member 36 has a plurality of threaded holes 361. The threaded holes 361 open towards a second axial side. In this embodiment, the threaded holes 361 extend axially through the inertial member 36, and therefore also open towards the first axial side. Each threaded hole 361 communicates with a corresponding through hole 310. A bolt 112 engages with the threaded hole 361 of the inertial member 36. Thus, the torque limiter 3 is mounted on the drive plate 110.

[0070] The inertial member 36 is configured to rotate integrally with the first side plate 31. Specifically, the inertial member 36 is mounted to the first side plate 31 by a plurality of pins 38. In addition, the inertial member 36 is also mounted to the first side plate 31 by a plurality of bolts 112.

[0071] The inertial member 36 overlaps with the cylindrical portion 312 when viewed radially. Specifically, the outer peripheral surface of the inertial member 36 faces the inner peripheral surface of the cylindrical portion 312. The inertial member 36 overlaps with the annular portion 311 when viewed axially. Specifically, the inertial member 36 overlaps with the first outer peripheral portion 311c when viewed axially. The inertial member 36 is opposite to the annular portion 311. Alternatively, other members may be sandwiched between the inertial member 36 and the annular portion 311.

[0072] The inertial member 36 overlaps with the second side plate 32 when viewed axially. More specifically, the inertial member 36 overlaps with the second outer periphery 323 when viewed axially. The inertial member 36 and the second outer periphery 323 are opposite each other. It should be noted that other members may also be sandwiched between the inertial member 36 and the second outer periphery 323.

[0073] The inertial member 36 is held axially by the annular portion 311 of the first side plate 31 and the second side plate 32. More specifically, the inertial member 36 is held axially by the first outer peripheral portion 311c and the second outer peripheral portion 323.

[0074] The inertial member 36 is disposed radially outward relative to the first bulge 311a. The inertial member 36 is also disposed radially outward relative to the second bulge 321. The inertial member 36 is radially disposed between the cylindrical portion 312 and the first bulge 311a. Furthermore, the inertial member 36 is radially disposed between the cylindrical portion 312 and the second bulge 321. Thus, the inertial member 36 is disposed within the space defined by the cylindrical portion 312, the first outer peripheral portion 311c, the first bulge 311a, the second outer peripheral portion 323, and the second bulge 321.

[0075] [Variation Example] The embodiments of the present invention have been described above, but the present invention is not limited thereto, and various modifications can be made without departing from the spirit of the present invention. In addition, the following variations can be applied simultaneously.

[0076] (a) The inertial member 36 may also not be ring-shaped. For example, such as Figure 4 and Figure 5 As shown, the inertial member 36 can also be composed of multiple nuts. The nuts 36 are spaced apart circumferentially. Each nut 36 can be fixed to the first side plate 31 by welding or the like. The nut 36 is thicker than the first side plate 31. Furthermore, Figure 4 This is the front view of the power transmission device in this modified example. Figure 5 yes Figure 4 VV-line sectional view.

[0077] like Figure 6 As shown, in this modified example, the second side plate 32 may also have multiple protrusions 325. Each protrusion 325 protrudes axially to a second side. Each protrusion 325 engages with the threaded hole of the corresponding nut 36. Thus, before the torque limiter 3 is mounted to the drive plate 110 using bolts 112, movement of the nuts 36 held by the first side plate 31 and the second side plate 32 in the circumferential direction can be prevented. In this way, movement of the nuts 36 can be prevented without welding them to the first side plate 31.

[0078] (b) The first side plate 31 may also not have a cylindrical portion 312.

[0079] Explanation of reference numerals in the attached figures 3. Torque limiter; 31. First side plate; 311. Annular portion; 311a. First bulge portion; 312. Cylindrical portion; 32. Second side plate; 321. Second bulge portion; 324. Outer peripheral surface; 324a. Abutting portion; 324b. Non-abutting portion; 33. Friction plate; 34. Pressure plate; 35. Force-applying component; 36. Inertial component; 361. Threaded hole; 4. Vibration damping unit; 41. First rotating component; 42. Second rotating component; 43. Elastic component; 100. Power transmission device; 110. Drive plate.

Claims

1. A power transmission device, comprising: The drive plate is configured to receive torque from the prime mover; and A torque limiter is configured to be mounted on the drive plate. The torque limiter has: A first side plate is disposed on a first side in the axial direction relative to the drive plate and is configured to rotate integrally with the drive plate; An inertial member is disposed on a first side in the axial direction relative to the first side plate and is configured to rotate integrally with the first side plate; The friction plate is configured to rotate relative to the first side plate; A pressure plate, in cooperation with the first side plate, clamps the friction plate; as well as The force-applying component applies axial force to the pressure plate toward the first side plate.

2. The power transmission device according to claim 1, wherein, The torque limiter has a second side plate, which is disposed on a first side in the axial direction relative to the first side plate. The friction plate, the pressure plate, and the force-applying component are axially positioned between the first side plate and the second side plate. The inertial member is held axially by the first side plate and the second side plate.

3. The power transmission device according to claim 1, wherein, The first side plate has: The annular portion extends circumferentially; and The cylindrical portion extends axially from the outer peripheral end of the annular portion towards a first side. The inertial member is configured to overlap with the cylindrical portion when viewed radially and with the annular portion when viewed axially.

4. The power transmission device according to claim 3, wherein, The torque limiter has a second side plate, which is disposed on a first side in the axial direction relative to the first side plate. The second side plate has an outer peripheral surface that abuts against the inner peripheral surface of the cylindrical portion.

5. The power transmission device according to claim 4, wherein, The outer peripheral surface of the second side plate has: The abutting portion extends in an arc shape when viewed axially and abuts against the inner circumferential surface of the cylindrical portion; and The non-abutting portion extends in a straight line when viewed axially and does not abut against the inner circumferential surface of the cylindrical portion.

6. The power transmission device according to claim 1, wherein, The first side plate has a first bulge that bulges out in a first direction axially. The inertial member is positioned radially outward relative to the first bulge.

7. The power transmission device according to claim 6, wherein, The torque limiter has a second side plate, which is disposed on a first side in the axial direction relative to the first side plate. The second side plate has a second bulge that bulges out toward a second side in the axial direction. The second bulge abuts against the first bulge in the axial direction. The inertial member is arranged radially outward relative to the first bulge and the second bulge.

8. The power transmission device according to claim 1, wherein, The inertial member has a threaded hole extending axially.

9. The power transmission device according to claim 1, wherein, The inertial component is a ring extending circumferentially. The thickness of the inertial component is greater than that of the first side plate.

10. The power transmission device according to claim 1, wherein, The inertial component is a nut that is thicker than the thickness of the first side plate.

11. The power transmission device according to claim 1, wherein, The power transmission device also includes a vibration damping unit. The vibration damping unit has: The first rotating component is configured to rotate integrally with the friction plate; The second rotating member is configured to rotate relative to the first rotating member; as well as An elastic member elastically connects the first rotating member and the second rotating member.

12. A torque limiter configured to be mounted on a drive plate, the drive plate being configured to receive torque from a prime mover, wherein, The torque limiter has the following features: A first side plate is disposed on a first side in the axial direction relative to the drive plate and is configured to rotate integrally with the drive plate; An inertial member is disposed on a first side in the axial direction relative to the first side plate and is configured to rotate integrally with the first side plate; The friction plate is configured to rotate relative to the first side plate; A pressure plate, in cooperation with the first side plate, clamps the friction plate; as well as The force-applying component applies axial force to the pressure plate toward the first side plate.

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