Power transmission device

Abstract

A power transmission device capable of suppressing imbalance of a first rotating member is disclosed. The power transmission device includes a torque limiter and a damping unit. The torque limiter includes a first side plate, a second side plate, and a friction plate. The damping unit includes the 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 side plate includes a ring portion and a cylindrical portion. The ring portion extends in a circumferential direction. The cylindrical portion extends from an outer peripheral end portion of the ring portion toward a first side in an axial direction. The first rotating member includes an outer peripheral surface that abuts against an inner peripheral surface of the cylindrical portion.

Description

Technical Field

[0001] This invention relates to a power transmission device. Background Technology

[0002] The power transmission device disclosed in Patent Document 1 includes a torque limiter and a vibration damping unit. The vibration damping unit includes a first rotating member, a second rotating member, and an elastic member. The first rotating member is capable of rotating relative to the second rotating member. The elastic member elastically connects the first rotating member and the second rotating member.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2021-196012 Summary of the Invention

[0006] The technical problem that the invention aims to solve

[0007] If an attempt is made to increase the inertia of the first rotating member, it becomes important to suppress the imbalance of the first rotating member. Therefore, the technical problem of the present invention is to suppress the imbalance of the first rotating member.

[0008] Solutions for solving technical problems

[0009] The power transmission device according to the first method includes a torque limiter and a vibration damping unit. The torque limiter has: a first side plate; a second side plate disposed on a first side in the axial direction relative to the first side plate, and the thickness of the second side plate is thinner than that of the first side plate; and a friction plate disposed in the axial direction between the first side plate and the second side plate, and configured to be rotatable relative to the first side plate and the second side plate. The vibration damping unit has: a first rotating member configured to rotate integrally with the friction plate; a second rotating member configured to rotate relative to the first rotating member; and an elastic member elastically connecting the first rotating member and the second rotating member. The second side plate has: an annular portion extending circumferentially; and a cylindrical portion extending from the outer peripheral end of the annular portion toward the first side in the axial direction. The first rotating member has an outer peripheral surface that abuts against the inner peripheral surface of the cylindrical portion.

[0010] According to this configuration, the outer peripheral surface of the first rotating member is supported by the cylindrical portion of the second side plate, thus suppressing the imbalance of the first rotating member.

[0011] The power transmission device according to the second embodiment is configured in the power transmission device according to the first embodiment as follows: The outer peripheral surface of the first rotating member has: an abutment portion that extends in an arc shape when viewed axially and abuts against the inner peripheral surface of the cylindrical portion; and a non-abutment portion that extends in a straight line when viewed axially and does not abut against the inner peripheral surface of the cylindrical portion.

[0012] The power transmission device involved in the third approach is configured in the power transmission device involved in the first or second approach as follows: The outer periphery of the first rotating member is arranged radially outward relative to the outer periphery of the friction plate.

[0013] The power transmission device involved in the fourth embodiment is configured as follows, in any of the power transmission devices involved in the first to third embodiments: the torque limiter has a fastening member for fastening the first side plate and the second side plate, and the cylindrical portion is arranged radially outward relative to the fastening member.

[0014] The power transmission device involved in the fifth embodiment is configured as follows, in any of the power transmission devices involved in the first to fourth embodiments: The torque limiter has an inertial member configured to rotate integrally with the first side plate.

[0015] The power transmission device according to the sixth embodiment is configured in the same manner as the power transmission device according to the fifth embodiment. The torque limiter has a fastening member for fastening the first side plate to the inertial member, and the cylindrical portion is disposed radially outward relative to the fastening member.

[0016] The power transmission device according to the seventh embodiment is configured in the same way as the power transmission device according to the fifth or sixth embodiment. The inertial member has a threaded hole extending axially.

[0017] The power transmission device involved in the eighth embodiment is configured in the following manner as in the power transmission devices involved in any of the fifth to seventh embodiments: the inertial member is in the form of a ring extending circumferentially, and the thickness of the inertial member is greater than the thickness of the first side plate.

[0018] The power transmission device involved in the ninth embodiment is configured in the following manner as in the power transmission devices involved in any of the fifth to seventh embodiments: The inertial member is a nut that is thicker than the thickness of the first side plate.

[0019] The power transmission device according to the tenth embodiment, in any of the power transmission devices according to the fifth to ninth embodiments, further includes: a drive plate disposed on a second side in the axial direction relative to the first side plate, the first side plate being configured to rotate integrally with the drive plate, and the inertial member being disposed in the axial direction between the drive plate and the first side plate.

[0020] The power transmission device according to the eleventh embodiment is configured as follows, in any of the power transmission devices according to the first to tenth embodiments: the first side plate has: an annular portion extending circumferentially; and a cylindrical portion extending axially from the outer peripheral end of the annular portion to a second side.

[0021] The effects of the invention

[0022] According to the present invention, the imbalance of the first rotating member can be suppressed. Attached Figure Description

[0023] Figure 1 This is the front view of the power transmission device.

[0024] Figure 2 yes Figure 1 Sectional view along line II-II.

[0025] Figure 3 This is an enlarged cross-sectional view of the power transmission device.

[0026] Figure 4 This is a cross-sectional view of the power transmission device involved in the modified example.

[0027] Explanation of reference numerals in the attached figures

[0028] 3: Torque limiter; 31: First side plate; 311: First annular portion; 312: First cylindrical portion; 32: Second side plate; 321: Second annular portion; 322: Second cylindrical portion; 33: Friction plate; 36: Inertial component; 361: Threaded hole; 37: First fastening component; 38: Second fastening component; 4: Vibration damping unit; 41: First rotating component; 412: Outer peripheral surface; 412a: Abutting portion; 412b: Non-abutting portion; 42: Second rotating component; 43: Elastic component; 100: Power transmission device; 110: Drive plate. Detailed Implementation

[0029] Hereinafter, the power transmission device 100 according to 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 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, the first side of the axial direction refers to... Figure 2 The right side, the second side of the axis refers to Figure 2 On the left side.

[0030] Figure 1 This is the front view of the power transmission device 100. Figure 2 yes Figure 1 The cross-sectional view along line II-II. (See figure) Figure 1 and Figure 2As 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 essentially as a unit. When the torque input 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.

[0031] The power transmission device 100 is disposed between the prime mover (not shown) and the output-side component (not shown). It should be noted that the prime mover refers to, for example, an internal combustion engine. The output-side component refers to, for example, 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.

[0032] [Driver Board]

[0033] 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.

[0034] [Vibration Damping Unit]

[0035] 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.

[0036] <First Rotating Component>

[0037] 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.

[0038] 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.

[0039] The first plate 41a and the second plate 41b each have a plurality of windows 411a and 411b. It should be noted that, 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.

[0040] 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.

[0041] Figure 3 This is an enlarged cross-sectional view of the power transmission device 100. (See attached image.) Figure 3 As shown, the outer peripheral surface 412 of the first rotating member 41 abuts against the inner peripheral surface of the second cylindrical portion 322 of the second side plate 32, which will be described later. It should be noted that 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.

[0042] like Figure 1 As shown, 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. It should be noted that, 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.

[0043] The abutting portion 412a extends in an arc shape when viewed axially. The abutting portion 412a abuts against the inner circumferential surface of the second cylindrical portion 322. 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 second cylindrical portion 322.

[0044] like Figure 2 and Figure 3 As shown, the outer periphery of the first rotating member 41 is arranged 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 first 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 arranged on a first side relative to the torque limiter 3 in the axial direction.

[0045] <Second Rotating Component>

[0046] 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.

[0047] The second rotating member 42 has a hub 421 and a flange plate 422. The hub 421 and the flange plate 422 are constructed independently, but they can also be integrally formed as a single member.

[0048] 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.

[0049] 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.

[0050] The flange plate 422 has a plurality of receiving holes 423. It should be noted that 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 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.

[0051] <Elastic Components>

[0052] 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.

[0053] The elastic member 43 is received in the receiving hole 423 of the second rotating member 42. In addition, the elastic member 43 is received in the window portion 411a of the first plate 41a and also in the window portion 411b of the second plate 41b.

[0054] [Torque Limiter]

[0055] 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.

[0056] 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.

[0057] 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, an inertia member 36, a first fastening member 37, and a second fastening member 38.

[0058] <First Side Panel>

[0059] The first side plate 31 is disposed on a first side in the axial direction relative to the drive plate 110. That is, the drive plate 110 is disposed on a second side in the axial direction relative to the first side plate 31. The first side plate 31 is mounted on the drive plate 110. Specifically, the first side plate 31 is mounted on the drive plate 110 via an inertial member 36.

[0060] 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.

[0061] The first side plate 31 has a first annular portion 311 and a first cylindrical portion 312. The first annular portion 311 and the first cylindrical portion 312 are integrally formed from a single component.

[0062] The first annular portion 311 is annular in shape extending circumferentially. The first annular portion 311 has a middle portion 311a, a first inner peripheral portion 311b, and a first outer peripheral portion 311c. The middle portion 311a is radially disposed between the first inner peripheral portion 311b and the first outer peripheral portion 311c. The middle portion 311a is disposed on a second side in the axial direction relative to the first outer peripheral portion 311c.

[0063] The first inner peripheral portion 311b is disposed radially inward relative to the middle portion 311a. The first inner peripheral portion 311b contacts the friction plate 33. The first inner peripheral portion 311b is disposed on the second side in the axial direction relative to the middle portion 311a.

[0064] The first outer peripheral portion 311c is positioned radially outward relative to the middle portion 311a. The first outer peripheral portion 311c abuts against the inertial member 36.

[0065] The first cylindrical portion 312 extends axially from the outer peripheral end of the first annular portion 311. More specifically, the first cylindrical portion 312 extends axially to a second side from the outer peripheral end of the first annular portion 311. That is, the first cylindrical portion 312 extends axially from the outer peripheral end of the first annular portion 311 toward the drive plate 110. It should be noted that the first 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.

[0066] The first cylindrical portion 312 overlaps with the drive plate 110 when viewed radially. Specifically, the front end (the second side end in the axial direction) of the first cylindrical portion 312 overlaps with the drive plate 110 when viewed radially. The outer peripheral surface of the drive plate 110 abuts against the inner peripheral surface of the first cylindrical portion 312.

[0067] <Second Side Panel>

[0068] 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.

[0069] 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 first fastening members 37. The first fastening members 37 are arranged at intervals in the circumferential direction. The first fastening members 37 are, for example, rivets.

[0070] The second side plate 32 has a second annular portion 321 and a second cylindrical portion 322. The second annular portion 321 and the second cylindrical portion 322 are integrally formed from a single component.

[0071] The second annular portion 321 is annular, extending circumferentially. The outer diameter of the second annular portion 321 is approximately the same as the outer diameter of the first annular portion 311. The second annular portion 321 overlaps with the second fastening member 38 in an axial view. The inner diameter of the second annular portion 321 is larger than the inner diameter of the first annular portion 311. The second annular portion 321 has a bulge 321a, a second inner peripheral portion 321b, and a second outer peripheral portion 321c.

[0072] A bulge 321a is radially disposed between the second inner peripheral portion 321b and the second outer peripheral portion 321c. The bulge 321a bulges axially. The bulge 321a bulges toward the first side plate 31. That is, the bulge 321a bulges toward a second axial side. The bulge 321a is disposed on a second axial side relative to the second inner peripheral portion 321b and the second outer peripheral portion 321c.

[0073] The bulge 321a extends circumferentially. The bulge 321a abuts against the intermediate portion 311a in the axial direction. The first fastening member 37 fastens the intermediate portion 311a and the bulge 321a.

[0074] The second inner circumferential portion 321b is disposed radially inward relative to the bulge portion 321a. The second inner circumferential portion 321b supports the force-applying member 35. The second inner circumferential portion 321b 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 321b.

[0075] The second outer peripheral portion 321c is positioned radially outward relative to the bulge portion 321a. The second outer peripheral portion 321c abuts against the first outer peripheral portion 311c in the axial direction. When viewed axially, the second outer peripheral portion 321c overlaps with the first outer peripheral portion 311c and the inertial member 36.

[0076] The second cylindrical portion 322 extends axially from the outer peripheral end of the second annular portion 321 along a first side. That is, the second cylindrical portion 322 extends axially from the outer peripheral end of the second annular portion 321 away from the first side plate 31. The second cylindrical portion 322 extends axially in the opposite direction to the first cylindrical portion 312. It should be noted that the second cylindrical portion 322 can be formed by bending the outer peripheral portion of the second side plate 32 axially. The second side plate 32 can be formed by sheet metal processing or stamping.

[0077] The second cylindrical portion 322 is disposed radially outward relative to the first fastening member 37. Furthermore, the second cylindrical portion 322 is disposed radially outward relative to the second fastening member 38. The second cylindrical portion 322 overlaps with the first rotating member 41 when viewed radially. The outer peripheral surface 412 of the first rotating member 41 abuts against the inner peripheral surface of the second cylindrical portion 322.

[0078] <Friction Plate>

[0079] Friction plate 33 is an annular plate extending circumferentially. Friction plate 33 is configured to rotate about rotation axis O. Friction plate 33 is configured to rotate relative to the first side plate 31 and the second side plate 32.

[0080] 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 first annular portion 311 in the axial direction. The friction plate 33 is configured to engage with the first side plate 31 through friction.

[0081] 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 via 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.

[0082] The friction plate 33 has a plate body portion 331, a first friction member 332, and a second friction member 333. The plate body portion 331 is annular, extending circumferentially. The first friction member 332 is mounted on a surface of the plate body portion 331 on a first axial side. The second friction member 333 is mounted on a surface of the plate body portion 331 on a second axial side. The first friction member 332 and the second friction member 333 rotate integrally with the plate 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 plate body portion 331.

[0083] <Pressure plate>

[0084] 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.

[0085] The pressure plate 34 is configured to rotate integrally with the first side plate 31. It should be noted that the pressure plate 34 is capable of axial movement 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.

[0086] <Force-applying component>

[0087] 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 321b at its outer circumferential end and against the pressure plate 34 at its inner circumferential end.

[0088] <Inertial Components>

[0089] The inertial member 36 is annular, extending circumferentially. The thickness of the inertial member 36 is greater than the thickness of the first side plate 31. It should be noted that the thickness of the inertial member 36 refers to the axial dimension. The inertial member 36 is disposed on the second side of the axial direction relative to the first side plate 31. The inertial member 36 is axially clamped between the first side plate 31 and the drive plate 110. It should be noted that other components may also be clamped between the inertial member 36 and the first side plate 31, or between the inertial member 36 and the drive plate 110.

[0090] The inertial member 36 is configured to rotate integrally with the first side plate 31. Specifically, the inertial member 36 is fastened to the first side plate 31 by a plurality of second fastening members 38. The second fastening members 38 are, for example, rivets.

[0091] The inertial member 36 is configured to be fixed to the drive plate 110. Specifically, the inertial member 36 has a plurality of threaded holes 361. The threaded holes 361 open towards a second axial direction. It should be noted that, in this embodiment, the threaded holes 361 axially penetrate the inertial member 36, and therefore also open towards a first axial direction. A bolt 112 penetrates the through hole 110a of the drive plate 110 and engages with the threaded hole 361 of the inertial member 36. That is, the bolt 112 fastens the drive plate 110 to the inertial member 36. Thus, the torque limiter 3 is mounted on the drive plate 110.

[0092] When viewed radially, the inertial member 36 overlaps with the first cylindrical portion 312. Specifically, the outer circumferential surface of the inertial member 36 faces the inner circumferential surface of the first cylindrical portion 312. When viewed axially, the inertial member 36 overlaps with the first annular portion 311. Specifically, when viewed axially, the inertial member 36 overlaps with the first outer circumferential portion 311c. The inertial member 36 is opposed to the first annular portion 311. It should be noted that other members may also be sandwiched between the inertial member 36 and the first annular portion 311.

[0093] The inertial member 36 is disposed radially outward relative to the intermediate portion 311a. The inertial member 36 is disposed radially between the first cylindrical portion 312 and the intermediate portion 311a. Thus, the inertial member 36 is disposed within the space defined by the first cylindrical portion 312, the first outer peripheral portion 311c, the intermediate portion 311a, and the drive plate 110.

[0094] [Variation Example]

[0095] The embodiments of the present invention have been described above, but the present invention is not limited thereto, and various modifications can be made as long as they do not depart from the spirit of the present invention. It should be noted that the following variations can be applied simultaneously.

[0096] (a) In the above embodiment, the inertial member 36 is in the form of a ring extending circumferentially, but the configuration of the inertial member 36 is not limited to this. For example, the inertial member 36 may also be composed of multiple nuts. The nuts 36 are arranged at intervals in the circumferential direction. The nuts 36 are thicker than the thickness of the first side plate 31. The nuts 36 may be fixed to the first side plate 31, for example, by welding. Alternatively, the torque limiter 3 may not have the inertial member 36.

[0097] (b) In the above embodiment, the first cylindrical portion 312 extends from the first annular portion 311 toward a second axial side, but the configuration of the first side plate 31 is not limited thereto. For example, the first cylindrical portion 312 may also extend from the outer peripheral end of the first annular portion 311 toward a first axial side. In this case, the inertial member 36 can be disposed on the first axial side relative to the first annular portion 311 in a manner that overlaps with the first cylindrical portion 312 when viewed radially. Alternatively, the first side plate 31 may not have the first cylindrical portion 312.

[0098] (c) In the above embodiment, the outer diameter of the second side plate 32 is approximately the same as that of the first side plate 31, but the configuration of the second side plate 32 is not limited thereto. For example, as Figure 4 As shown, the outer diameter of the second side plate 32 may also be smaller than that of the first side plate 31. The second cylindrical portion 322 is disposed radially inward relative to the inertial member 36. Specifically, the second cylindrical portion 322 is disposed radially inward relative to the bolt 114 that fastens the first side plate 31 to the inertial member 36. According to this configuration, the first side plate 31 and the inertial member 36 can be fastened from the first side in the axial direction by the bolt 114.

Claims

1. A power transmission device, comprising: Torque limiter and vibration damping unit, The torque limiter has: First side panel; The second side plate is disposed on the first side of the axial direction relative to the first side plate, and the thickness of the second side plate is thinner than that of the first side plate. as well as A friction plate is axially disposed between the first side plate and the second side plate, and is configured to rotate relative to the first side plate and the second side plate. 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. The second side plate has: The annular portion extends circumferentially; as well as The cylindrical portion extends axially from the outer peripheral end of the annular portion towards a first side. The first rotating member has an outer peripheral surface that abuts against the inner peripheral surface of the cylindrical portion.

2. The power transmission device according to claim 1, wherein, The outer peripheral surface of the first rotating member 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.

3. The power transmission device according to claim 1, wherein, The outer periphery of the first rotating member is arranged radially outward relative to the outer periphery of the friction plate.

4. The power transmission device according to claim 1, wherein, The torque limiter has a fastening member that secures the first side plate to the second side plate. The cylindrical portion is positioned radially outward relative to the fastening member.

5. The power transmission device according to claim 1, wherein, The torque limiter has an inertial member configured to rotate integrally with the first side plate.

6. The power transmission device according to claim 5, wherein, The torque limiter has a fastening member for securing the first side plate to the inertial member. The cylindrical portion is positioned radially outward relative to the fastening member.

7. The power transmission device according to claim 5, wherein, The inertial member has a threaded hole extending axially.

8. The power transmission device according to claim 5, wherein, The inertial component is in the form of a ring extending circumferentially. The thickness of the inertial component is greater than that of the first side plate.

9. The power transmission device according to claim 5, wherein, The inertial component is a nut that is thicker than the thickness of the first side plate.

10. The power transmission device according to claim 5, further comprising: The drive plate is disposed on the second side in the axial direction relative to the first side plate. The first side plate is configured to rotate integrally with the drive plate. The inertial member is axially positioned between the drive plate and the first side plate.

11. 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 to a second side from the outer peripheral end of the annular portion.

Images