Power transmission device

Abstract

To provide a power transmission device that can be made low-cost. [Solution] The power transmission device comprises a drive plate and a torque fluctuation suppression device. The drive plate is configured to receive torque from the prime mover. The torque fluctuation suppression device is positioned on the first axial side of the drive plate. The torque fluctuation suppression device is configured to be attached to the drive plate. The drive plate has a disc portion and a first cylindrical portion. The first cylindrical portion extends from the outer peripheral end of the disc portion to the first axial side.

Description

Technical Field

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

Background Art

[0002] The power transmission device disclosed in Patent Document 1 has a flywheel, a torque limiter, and a damper unit. The flywheel has a flexible plate and an inertia ring. The torque limiter is attached to the inertia ring.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to provide a power transmission device capable of cost reduction.

Means for Solving the Problems

[0005] The power transmission device according to the first aspect includes a drive plate and a torque fluctuation suppressing device. The drive plate is configured to receive torque from a prime mover. The torque fluctuation suppressing device is disposed on the first axial side with respect to the drive plate. The torque fluctuation suppressing device is configured to be attached to the drive plate. The drive plate has a disk portion and a first cylindrical portion. The first cylindrical portion extends from the outer peripheral end of the disk portion to the first axial side.

[0006] With this configuration, since the drive plate has a first cylindrical portion, this first cylindrical portion can function as at least part of the inertial ring. Therefore, at least part of the inertial ring can be omitted. Inertial rings are generally formed by casting, and drive plates are generally formed by sheet metal processing or press working of a metal plate. Here, a drive plate formed by sheet metal processing or press working is cheaper than an inertial ring formed by casting. Therefore, the power transmission device can be made less expensive.

[0007] The power transmission device according to the second embodiment is configured as follows in the power transmission device according to the first embodiment. The torque fluctuation suppression device has a contact surface facing radially outward. The contact surface contacts the inner circumferential surface of the first cylindrical portion. With this configuration, the torque fluctuation suppression device can be positioned by the first cylindrical portion.

[0008] The power transmission device according to the third embodiment is configured as follows in the power transmission device according to the first or second embodiment: The torque fluctuation suppression device has an annular portion and a second cylindrical portion. The annular portion extends in the circumferential direction. The second cylindrical portion extends axially from the outer peripheral end of the annular portion. The first cylindrical portion overlaps with the second cylindrical portion in radial view.

[0009] The power transmission device according to the fourth embodiment is configured as follows in the power transmission device according to the third embodiment: The first cylindrical portion is arranged radially outward relative to the second cylindrical portion.

[0010] The power transmission device according to the fifth embodiment is configured as follows in the power transmission device according to the fourth embodiment: The inner surface of the first cylindrical portion is in contact with the outer surface of the second cylindrical portion.

[0011] The power transmission device according to the sixth embodiment is configured as follows in the power transmission device according to the third to fifth embodiments: The second cylindrical portion extends from the outer peripheral end of the annular portion to the first axial side.

[0012] The power transmission device according to the seventh embodiment is configured as follows in the power transmission device according to the sixth embodiment: The torque fluctuation suppression device has a connecting portion and a third cylindrical portion. The connecting portion extends radially outward from the tip of the second cylindrical portion. The third cylindrical portion extends axially to the second side from the outer peripheral end of the connecting portion. The first cylindrical portion is arranged radially between the second cylindrical portion and the third cylindrical portion.

[0013] The power transmission device according to the eighth embodiment further comprises a vibration absorbing member in the power transmission device according to the seventh embodiment. The vibration absorbing member is arranged in the axial direction between the connecting portion and the first cylindrical portion.

[0014] The power transmission device according to the ninth embodiment further comprises an inertia member in the power transmission device according to any of the first to eighth embodiments. The inertia member is configured to rotate integrally with the drive plate.

[0015] The power transmission device according to the tenth embodiment is configured as follows in the power transmission device according to the ninth embodiment: The inertia member is positioned axially between the drive plate and the torque fluctuation suppression device.

[0016] The power transmission device according to the 11th embodiment is configured as follows in the power transmission device according to the 9th or 10th embodiment: The inertia member is arranged to overlap with the first cylindrical portion in a radial view.

[0017] The power transmission device according to the 12th embodiment is configured as follows in the power transmission device according to any of the 9th to 11th embodiments: The inertia member has a screw hole extending in the axial direction.

[0018] The power transmission device according to the 13th embodiment is configured as follows in the power transmission device according to any of the 9th to 12th embodiments: The inertia member is a nut that is thicker than the thickness of the drive plate.

[0019] The power transmission device according to the 14th embodiment is configured as follows in the power transmission device according to any of the 9th to 12th embodiments: The inertia member is annular in shape extending in the circumferential direction. The thickness of the inertia member is greater than the thickness of the drive plate.

[0020] A power transmission device according to the 15th embodiment is configured as follows in a power transmission device according to any of the 1st to 14th embodiments. The torque fluctuation suppression device has at least one of a torque limiter and a damper unit. The torque limiter has a first side plate, a friction plate, a pressure plate, and a biasing member. The first side plate is configured to rotate integrally with the drive plate. The friction plate is arranged to be rotatable relative to the first side plate. The pressure plate cooperates with the first side plate to clamp the friction plate. The biasing member biases the pressure plate axially toward the first side plate. The damper unit has a first rotating member, a second rotating member, and an elastic member. The second rotating member is arranged to be rotatable relative to the first rotating member. The elastic member elastically connects the first rotating member and the second rotating member.

[0021] The power transmission device according to the 16th embodiment is configured as follows in the power transmission device according to the 15th embodiment: The torque limiter has a second side plate. The friction plate, pressure plate, and biasing member are arranged in the axial direction between the first side plate and the second side plate.

[0022] The power transmission device according to the 17th embodiment is configured as follows in the power transmission device according to the 16th embodiment: The second side plate is positioned in the axial direction between the drive plate and the first side plate.

[0023] The power transmission device according to the 18th embodiment is configured as follows in the power transmission device according to any of the 15th to 17th embodiments: The elastic member is positioned radially inward with respect to the torque limiter.

[0024] The power transmission device according to the 19th aspect is configured as follows in the power transmission device according to any one of the 1st to 18th aspects. The torque fluctuation suppression device has an annular portion extending in the circumferential direction. The inner peripheral surface of the first cylindrical portion abuts on the outer peripheral surface of the annular portion.

Effect of the Invention

[0025] According to the present invention, the cost of the power transmission device can be reduced.

Brief Description of the Drawings

[0026] [Figure 1] Plan view of the power transmission device. [Figure 2] Cross-sectional view taken along line II-II of FIG. 1. [Figure 3] Enlarged cross-sectional view of the power transmission device. [Figure 4] Enlarged cross-sectional view of the power transmission device according to the modification. [Figure 5] Enlarged cross-sectional view of the power transmission device according to the modification. [Figure 6] Plan view of the power transmission device according to the modification. [Figure 7] Cross-sectional view taken along line VII-VII of FIG. 6. [Figure 8] Plan view of the power transmission device according to the modification. [Figure 9] Cross-sectional view of the power transmission device according to the modification. [Figure 10] Enlarged cross-sectional view of the power transmission device according to the modification.

Mode for Carrying Out the Invention

[0027] Hereinafter, 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 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 right side in FIG. 2, and the second axial side means the left side in FIG. 2.

[0028] Figure 1 is a front view of the power transmission device 100, and Figure 2 is a cross-sectional view taken along line II-II in Figure 1. As shown in Figures 1 and 2, the power transmission device 100 includes a drive plate 2, a vibration absorbing member 5, a plurality of inertia members 6, and a torque fluctuation suppression device 110. The torque fluctuation suppression device 110 includes a torque limiter 3 and a damper unit 4. The drive plate 2 and the torque limiter 3 are configured to rotate integrally with each other. The torque limiter 3 and the damper unit 4 are rotatable relative to each other, but basically rotate integrally with each other. When the torque transmitted to the power transmission device 100 exceeds a predetermined value, the torque limiter 3 and the damper unit 4 rotate relative to each other.

[0029] The power transmission device 100 is installed between the prime mover (not shown) and the output side member (not shown). The prime mover is, for example, an internal combustion engine. The output side member is, for example, an electric motor or a transmission. The internal combustion engine is positioned on the second axial side (left side in Figure 2) relative to the power transmission device 100, and the output side member is positioned on the first axial side (right side in Figure 2) relative to 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.

[0030] [Drive Plate] The drive plate 2 is configured to receive torque from the prime mover. Specifically, the drive plate 2 is attached to the crankshaft 102 by a number of bolts 101. The drive plate 2 is disc-shaped.

[0031] The drive plate 2 has a disc portion 21 and a first cylindrical portion 22. The disc portion 21 is configured to be attached to the crankshaft 102. Specifically, the disc portion 21 has a plurality of through holes 211. Through these through holes 211, bolts 101 fasten the drive plate 2 to the crankshaft 102.

[0032] The first cylindrical portion 22 extends from the outer peripheral end of the disc portion 21 toward the first axial direction. The first cylindrical portion 22 is formed by bending the outer peripheral portion of the drive plate 2. The drive plate 2 can be made of steel sheet or the like, specifically SPCC (cold-rolled steel sheet), SPHC (hot-rolled steel sheet), or SAPH (hot-rolled steel sheet for automotive structural use). The drive plate 2 can be formed by sheet metal processing or press processing of the steel sheet. Specifically, the drive plate 2 can be formed by a single-stroke press, a progressive press, or a transfer press. Therefore, the first cylindrical portion 22 has substantially the same thickness as the disc portion 21. The thickness of the drive plate 2 can be, for example, about 2.0 to 8.0 mm.

[0033] [Torque fluctuation suppression device] The torque fluctuation suppression device 110 includes a torque limiter 3 and a damper unit 4. The torque fluctuation suppression device 110 is configured to suppress torque fluctuations. The torque fluctuation suppression device 110 is positioned on the first axial side relative to the drive plate 2. The torque fluctuation suppression device 110 is configured to be attached to the drive plate 2.

[0034] [torque limiter] The torque limiter 3 is rotatably positioned around the rotation axis O. The torque limiter 3 is positioned on the first axial side relative to the drive plate 2. The torque limiter 3 is annular in shape. The torque limiter 3 is configured to be mounted on the drive plate 2.

[0035] The torque limiter 3 is configured to limit the torque transmitted between the drive plate 2 and the damper unit 4. In other words, the torque limiter 3 is configured to restrict the transmission of torque exceeding a predetermined value in the power transmission device 100. The torque limiter 3 is positioned radially outward relative to the damper unit 4.

[0036] The torque limiter 3 includes a first side plate 31, a second side plate 32, a friction plate 33, a pressure plate 34, and a biasing member 35.

[0037] <First side plate> The first side plate 31 is positioned on the first axial side relative to the drive plate 2. The first side plate 31 is attached to the drive plate 2. Specifically, the first side plate 31 is attached to the drive plate 2 via an inertia member 6 fixed to the drive plate 2.

[0038] The first side plate 31 and the second side plate 32 are fixed to the inertia member 6 by screwing the bolt 103 into the threaded hole 61 of the inertia member 6. The first side plate 31 is annular in shape.

[0039] Figure 3 is an enlarged cross-sectional view of the power transmission device 100. As shown in Figure 3, the first side plate 31 has an annular portion 311, a second cylindrical portion 312, a connecting portion 313, and a third cylindrical portion 314. The annular portion 311, the second cylindrical portion 312, the connecting portion 313, and the third cylindrical portion 314 are integrally formed from a single component.

[0040] The annular portion 311 is an annular shape extending in the circumferential direction. The annular portion 311 has a first inner circumferential portion 311a and a first outer circumferential portion 311b. The first inner circumferential portion 311a is in contact with the friction plate 33. The first inner circumferential portion 311a is positioned on the first axial side relative to the first outer circumferential portion 311b. The first outer circumferential portion 311b is positioned radially outward relative to the first inner circumferential portion 311a. In an axial view, the first outer circumferential portion 311b overlaps with the inertia member 6.

[0041] The second cylindrical portion 312 extends axially from the outer peripheral end of the annular portion 311. More specifically, the second cylindrical portion 312 extends axially from the outer peripheral end of the annular portion 311 toward the first side. That is, the second cylindrical portion 312 extends axially from the outer peripheral end of the annular portion 311 toward the drive plate 2. The second cylindrical portion 312 extends in the same direction as the first cylindrical portion 22. The second cylindrical portion 312 is positioned radially inward relative to the first cylindrical portion 22. In a radial view, the first cylindrical portion 22 overlaps with the second cylindrical portion 312. More specifically, the tip of the first cylindrical portion 22 overlaps with the second cylindrical portion 312 in a radial view.

[0042] The connecting portion 313 extends radially outward from the tip of the second cylindrical portion 312. More specifically, the connecting portion 313 extends radially outward from the first axial end of the second cylindrical portion 312. The connecting portion 313 is an annular shape extending in the circumferential direction. The connecting portion 313 connects the second cylindrical portion 312 and the third cylindrical portion 314. In an axial view, the connecting portion 313 overlaps with the first cylindrical portion 22. The connecting portion 313 and the first cylindrical portion 22 are spaced apart in the axial direction.

[0043] The third cylindrical portion 314 extends from the outer peripheral end of the connecting portion 313 to the second axial direction. That is, the outer peripheral portion of the first side plate 31 is bent to the first axial direction to form the second cylindrical portion 312, and then that outer peripheral portion is further bent back to the second axial direction to form the third cylindrical portion 314. For this reason, the third cylindrical portion 314 has substantially the same plate thickness as the annular portion 311, the second cylindrical portion 312, and the connecting portion 313. The plate thickness of the first side plate 31 can be, for example, about 2.0 to 8.0 mm.

[0044] The third cylindrical portion 314 is positioned radially outward relative to the second cylindrical portion 312. The third cylindrical portion 314 is spaced apart from the second cylindrical portion 312 in the radial direction. The first cylindrical portion 22 is positioned radially between the second cylindrical portion 312 and the third cylindrical portion 314. More specifically, the tip of the first cylindrical portion 22 is positioned radially between the second cylindrical portion 312 and the third cylindrical portion 314. The first cylindrical portion 22, the second cylindrical portion 312, and the third cylindrical portion 314 overlap in a radial view. The third cylindrical portion 314 is longer than the first cylindrical portion 22. The third cylindrical portion 314 covers the entire outer circumferential surface of the first cylindrical portion 22.

[0045] The inner circumferential surface of the first cylindrical portion 22 is in contact with the outer circumferential surface of the second cylindrical portion 312. In this case, the outer circumferential surface of the second cylindrical portion 312 corresponds to the contact surface of the present invention. The outer circumferential surface of the first cylindrical portion 22 is spaced apart from the inner circumferential surface of the third cylindrical portion 314, but it may be in contact with the inner circumferential surface of the third cylindrical portion 314. If the outer circumferential surface of the first cylindrical portion 22 is in contact with the inner circumferential surface of the third cylindrical portion 314, the inner circumferential surface of the first cylindrical portion 22 may be spaced apart from the outer circumferential surface of the second cylindrical portion 312.

[0046] The first side plate 31 can be formed from a steel sheet, specifically from SPCC (cold-rolled steel sheet), SPHC (hot-rolled steel sheet), or SAPH (hot-rolled steel sheet for automotive structural use). The second cylindrical portion 312, the connecting portion 313, and the third cylindrical portion 314 can be formed by bending the outer circumference of the first side plate 31 in the axial direction. The first side plate 31 can be formed from a steel sheet by sheet metal processing or press processing. Specifically, the first side plate 31 can be formed by a single-stroke press, a progressive press, or a transfer press.

[0047] <Second side plate> The second side plate 32 is positioned on the second axial side relative to the first side plate 31. That is, the second side plate 32 is positioned axially between the drive plate 2 and the first side plate 31. More specifically, the second side plate 32 is positioned within the space defined by the disc portion 21, the first cylindrical portion 22, and the annular portion 311.

[0048] A friction plate 33, a pressure plate 34, and a biasing member 35 are positioned axially between the first side plate 31 and the second side plate 32. The thickness of the second side plate 32 is thinner than the thickness of the first side plate 31.

[0049] 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 (see Figure 2). Each fastening member 37 is spaced apart in the circumferential direction. The fastening members 37 are, for example, rivets. The first side plate 31 and the second side plate 32, fastened together by the fastening members 37, are fixed to the inertia member 6 by bolts 103.

[0050] The second side plate 32 has a second inner circumference 321 and a second outer circumference 322. The second inner circumference 321 supports the biasing member 35. The second inner circumference 321 is positioned on the second axial side relative to the second outer circumference 322. The second inner circumference 321 is positioned at a distance from the first inner circumference 311a in the axial direction. The friction plate 33, pressure plate 34, and biasing member 35 are positioned between the first inner circumference 311a and the second inner circumference 321 in the axial direction.

[0051] The second outer circumference 322 is positioned radially outward relative to the second inner circumference 321. The second outer circumference 322 is in contact with the first outer circumference 311b in the axial direction. The second outer circumference 322 is sandwiched in the axial direction by the first outer circumference 311b and the inertia member 6.

[0052] The outer circumferential surface of the second side plate 32 faces the inner circumferential surface of the first cylindrical portion 22. The outer circumferential surface of the second side plate 32 may be in contact with the inner circumferential surface of the first cylindrical portion 22, or it may be positioned with a gap between them.

[0053] <Friction Plate> As shown in Figures 2 and 3, the friction plate 33 is an annular plate extending in the circumferential direction. The friction plate 33 is rotatably positioned around the axis of rotation O. The friction plate 33 is rotatably positioned relative to the first side plate 31.

[0054] The friction plate 33 is in contact with the first side plate 31 in the axial direction. More specifically, the friction plate 33 is in contact with the first inner circumference 311a of the annular portion 311 in the axial direction. The friction plate 33 is configured to frictionally engage with the first side plate 31.

[0055] The friction plate 33 is attached to the first rotating member 41 of the damper unit 4, which will be described later. More specifically, the friction plate 33 is attached to the second plate 41b. For example, the friction plate 33 is attached to the second plate 41b by a plurality of fastening members 104. The friction plate 33 rotates integrally with the first rotating member 41. Although the friction plate 33 is a separate component from the second plate 41b, the friction plate 33 may be integrally constructed with the second plate 41b as a single component.

[0056] The friction plate 33 comprises a plate body 331, a first friction material 332, and a second friction material 333. The plate body 331 is annular in shape and extends in the circumferential direction. The first friction material 332 is attached to the axial first side surface of the plate body 331. The second friction material 333 is attached to the axial second side surface of the plate body 331. The first and second friction materials 332 and 333 rotate integrally with the plate body 331. The first and second friction materials 332 and 333 are annular in shape. The first and second friction materials 332 and 333 are attached to the outer circumference of the plate body 331.

[0057] <Pressure Plate> The pressure plate 34 is annular in shape. The pressure plate 34 is positioned axially between the biasing 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 are in contact with the first and second friction materials 332 and 333.

[0058] The pressure plate 34 is configured to rotate integrally with the first side plate 31. The pressure plate 34 is also axially movable relative to the first side plate 31. Specifically, the pressure plate 34 has a plurality of protrusions 341 that project radially outward. These protrusions 341 engage with engagement holes formed in the second side plate 32, so that the pressure plate 34 rotates integrally with the second side plate 32 while being axially movable relative to the second side plate 32. Since the second side plate 32 rotates integrally with the first side plate 31 and is not axially movable relative to the first side plate 31, the pressure plate 34 rotates integrally with the first side plate 31 and is axially movable relative to the first side plate 31.

[0059] <Biasing member> The biasing member 35 is positioned axially between the second side plate 32 and the pressure plate 34. The biasing member 35 biases the pressure plate 34 toward the first axial direction. That is, the biasing member 35 biases the pressure plate 34 toward the first side plate 31. As a result, the friction plate 33 is sandwiched between the pressure plate 34 and the first side plate 31. The biasing member 35 is an annular shape extending in the circumferential direction. The biasing member 35 is, for example, a disc spring. The biasing member 35 is in contact with the second inner circumference portion 321 at its outer peripheral end and in contact with the pressure plate 34 at its inner peripheral end.

[0060] [Vibration absorbing material] The vibration absorbing member 5 is positioned in the axial direction between the connecting portion 313 and the first cylindrical portion 22. More specifically, the vibration absorbing member 5 is positioned within the space defined by the first cylindrical portion 22, the second cylindrical portion 312, the connecting portion 313, and the third cylindrical portion 314. The vibration absorbing member 5 is an annular shape extending in the circumferential direction. The vibration absorbing member 5 is, for example, an O-ring. The vibration absorbing member 5 is compressed in the axial direction.

[0061] [Inertia component] The inertia member 6 is positioned on the first axial side relative to the drive plate 2. The inertia member 6 is positioned on the second axial side relative to the first side plate 31. The inertia member 6 is configured to rotate integrally with the drive plate 2. Specifically, the inertia member 6 is fixed to the drive plate 2 by welding. The inertia member 6 is fixed to the outer circumference of the drive plate 2. Each inertia member 6 is spaced apart from each other in the circumferential direction.

[0062] In a radial view, the inertia member 6 overlaps with the first cylindrical portion 22 and the third cylindrical portion 314. More specifically, the inertia member 6 faces the inner circumferential surface of the first cylindrical portion 22. In an axial view, the inertia member 6 overlaps with the annular portion 311. More specifically, in an axial view, the inertia member 6 overlaps with the first outer circumferential portion 311b.

[0063] In an axial view, the inertia member 6 overlaps with the second side plate 32. More specifically, in an axial view, the inertia member 6 overlaps with the second outer periphery 322. The inertia member 6 faces the second outer periphery 322. Another member may be interposed between the inertia member 6 and the second outer periphery 322.

[0064] The inertia member 6 is positioned in the axial direction between the drive plate 2 and the first side plate 31. More specifically, the inertia member 6 is sandwiched in the axial direction between the drive plate 2 and the second side plate 32. More specifically, the inertia member 6 is sandwiched in the axial direction between the disc portion 21 and the second outer circumference portion 322.

[0065] The inertia member 6 is, for example, a nut. The inertia member 6 is thicker than the thickness of the first side plate 31. Also, the inertia member 6 is thicker than the thickness of the drive plate 2. Note that the thickness of the inertia member 6 refers to the axial dimension.

[0066] The inertia member 6 has a screw hole 61 that extends in the axial direction. The screw hole 61 opens on the first side in the axial direction. In this embodiment, since the screw hole 61 penetrates the inertia member 6 in the axial direction, it also opens on the second side in the axial direction. The bolt 103 is screwed into the screw hole 61 of the inertia member 6. In this way, the first side plate 31 and the second side plate 32 are attached to the drive plate 2 via the inertia member 6.

[0067] [Damper Unit] The damper unit 4 is attached to the torque limiter 3. The damper unit 4 is configured to dampen rotational fluctuations. The damper unit 4 has a first rotating member 41, a second rotating member 42, and a plurality of elastic members 43.

[0068] <First rotating member> The first rotating member 41 rotates integrally with the friction plate 33 of the torque limiter 3. 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 having a central hole. The first plate 41a and the second plate 41b rotate integrally with each other. Furthermore, the first plate 41a and the second plate 41b are immovable relative to each other in the axial direction. The first plate 41a and the second plate 41b are fastened to each other by a plurality of fastening members 106.

[0069] The first plate 41a and the second plate 41b are arranged with a gap between them in the axial direction. The second plate 41b is positioned on the second side in the axial direction relative to the first plate 41a.

[0070] The first plate 41a and the second plate 41b each have multiple window portions 411a and 411b. In this embodiment, the first plate 41a and the second plate 41b each have four window portions 411a and 411b, but the number is not limited to this.

[0071] Each window section 411a, 411b is spaced apart from each other in the circumferential direction. Each window section 411a, 411b is configured to accommodate an elastic member 43.

[0072] The outer edge of the first rotating member 41 is positioned radially outward relative to the outer edge of the friction plate 33. That is, the outer diameter of the first rotating member 41 is larger than the outer diameter of the friction plate 33. In an axial view, the outer periphery of the first rotating member 41 overlaps with the friction surface between the friction plate 33 and the first side plate 31. The outer periphery of the first rotating member 41 is positioned on the first axial side relative to the torque limiter 3.

[0073] <Second rotating member> The second rotating member 42 is configured to transmit torque from the first rotating member 41 to the output member. The second rotating member 42 is positioned axially between the first plate 41a and the second plate 41b. The second rotating member 42 is positioned to be rotatable relative to the first plate 41a and the second plate 41b.

[0074] 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 separate members, but they may also be formed integrally as a single member.

[0075] The hub 421 is cylindrical and extends axially. The hub 421 is positioned within the central holes of the first plate 41a and the second plate 41b. Spline holes extending axially are formed on the inner circumference of the hub 421. The input shaft of the output-side member can be spline-fitted into these spline holes.

[0076] The flange plate 422 extends radially from the outer circumferential surface of the hub 421. The flange plate 422 is formed in an annular shape. The flange plate 422 is rotatably positioned relative to the first plate 41a and the second plate 41b. In the axial direction, the flange plate 422 is positioned between the first plate 41a and the second plate 41b.

[0077] The flange plate 422 has a plurality of accommodating holes 423. In this embodiment, the flange plate 422 has four accommodating holes 423, but this number is not limited to this. Each accommodating hole 423 is spaced apart from each other in the circumferential direction. Each accommodating hole 423 is configured to accommodate an elastic member 43. Each accommodating hole 423 is positioned to overlap with each window portion 411a, 411b in an axial view.

[0078] <Elastic material> 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 coil spring.

[0079] The elastic member 43 is housed in the housing hole 423 of the second rotating member 42. The elastic member 43 is also housed in the window portion 411a of the first plate 41a and in the window portion 411b of the second plate 41b. The elastic member 43 is positioned radially inward relative to the torque limiter 3.

[0080] [Differentiation] Although embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications are possible without departing from the spirit of the invention. Furthermore, the following modifications can basically be applied simultaneously.

[0081] (a) In the above embodiment, the first side plate 31 had a second cylindrical portion 312, a connecting portion 313, and a third cylindrical portion 314, but the configuration of the first side plate 31 is not limited thereto. For example, as shown in Figure 4, the first side plate 31 does not have to have a connecting portion 313 and a third cylindrical portion 314. That is, the second cylindrical portion 312 may be the outer peripheral end of the first side plate 31. The first side plate 31 does not have to have a second cylindrical portion 312 either.

[0082] (b) In the above embodiment, the second cylindrical portion 312 extends from the annular portion 311 to the first axial side, but the configuration of the first side plate 31 is not limited thereto. For example, as shown in Figure 5, the second cylindrical portion 312 of the first side plate 31 may extend from the annular portion 311 to the second axial side. In this case, the first cylindrical portion 22 may be positioned radially inward relative to the second cylindrical portion 312. The outer circumferential surface of the first cylindrical portion 22 may be in contact with the inner circumferential surface of the second cylindrical portion 312.

[0083] (c) In the above embodiment, the inertia member 6 is fixed to the drive plate 2 by welding, but the method of fixing the inertia member 6 is not limited to welding. For example, as shown in Figures 6 and 7, the inertia member 6 may be fixed to the drive plate 2 by bolts 105. Specifically, the inertia member 6 has a first screw hole 61 and a second screw hole 62. In this modified example, the inertia member 6 has one first screw hole 61 and two second screw holes 62. The first screw hole 61 and the second screw holes 62 may have the same diameter or may have different diameters. The inertia member 6 is fixed to the drive plate 2 by screwing the bolt 105 into the second screw hole 62. The inertia member 6 is also fixed to the first side plate 31 by screwing the bolt 103 into the first screw hole 61. As a result, the first side plate 31 is fixed to the drive plate 2 via the inertia member 6.

[0084] (d) In the above embodiment, the second side plate 32 is positioned on the second axial side relative to the first side plate 31, but the configuration of the torque limiter 3 is not limited thereto. For example, the second side plate 32 may be positioned on the first axial side relative to the first side plate 31.

[0085] (e) In the above embodiment, the inertia member 6 is made up of nuts, but the configuration of the inertia member 6 is not limited to this. For example, as shown in Figure 8, the inertia member 6 may be an annular shape extending in the circumferential direction. The thickness of the inertia member 6 is greater than the thickness of the first side plate 31. Also, the thickness of the inertia member 6 is greater than the thickness of the drive plate 2.

[0086] (f) In the above embodiment, the torque fluctuation suppression device 110 has a torque limiter 3 and a damper unit 4, but the configuration of the torque fluctuation suppression device 110 is not limited thereto. For example, as shown in Figure 9, the torque fluctuation suppression device 110 does not have a torque limiter 3. In this case, the damper unit 4 is attached to the drive plate 2. In this case, the first rotating body 41 of the damper unit 4 is attached to the inertia member 6 by bolts 103.

[0087] The first rotating body 41 has a mounting plate 41c in addition to the first plate 41a and the second plate 41b. The mounting plate 41c is attached to the inertia member 6 by bolts 103.

[0088] The mounting plate 41c is positioned axially between the first plate 41a and the second plate 41b. The mounting plate 41c is configured to rotate integrally with the first plate 41a and the second plate 41b. The mounting plate 41c is fastened to the first plate 41a and the second plate 41b by fastening members 106. The mounting plate 41c is annular in shape and extends in the circumferential direction.

[0089] The mounting plate 41c has an annular portion 411c, a second cylindrical portion 412c, a connecting portion 413c, and a third cylindrical portion 414c. Note that the annular portion 411c, the second cylindrical portion 412c, the connecting portion 413c, and the third cylindrical portion 414c of the mounting plate 41c correspond to the annular portion 311, the second cylindrical portion 312, the connecting portion 313, and the third cylindrical portion 314 of the first side plate 31 described above, so a detailed explanation is omitted. The inner circumferential surface of the first cylindrical portion 22 is in contact with the outer circumferential surface of the second cylindrical portion 412c. In this case, the outer circumferential surface of the second cylindrical portion 412c corresponds to the contact surface of the present invention.

[0090] The mounting plate 41c is positioned to overlap with the flange plate 422 in a radial view. The thickness of the mounting plate 41c can be the same as the thickness of the flange plate 422. For example, the flange plate 422 and the mounting plate 41c can be made from a single plate.

[0091] Furthermore, the torque fluctuation suppression device 110 may have only the torque limiter 3 and not the damper unit 4.

[0092] (g) As shown in Figure 10, the torque fluctuation suppression device 110 does not have to have a second cylindrical portion 312. In this case, the outer circumferential surface of the annular portion 311 abuts against the inner circumferential surface of the first cylindrical portion 22. That is, the outer circumferential surface of the annular portion 311 corresponds to the abutment surface of the present invention. [Explanation of Symbols]

[0093] 2: Drive Plate 21: Disc section 22: First cylindrical section 3: Torque limiter 31: First side plate 311: Ring section 312: Second cylindrical section 313 :Connection part 314: Third cylindrical section 32: Second side plate 33: Friction Plate 34: Pressure Plate 35: Biasing member 4: Damper Unit 41: First rotating member 42: Second rotating member 43: Elastic member 5: Vibration absorbing member 6: Inertia component 61: Screw hole 100: Power transmission device 110: Torque fluctuation suppression device

Claims

1. A drive plate configured to receive torque from the prime mover, A torque fluctuation suppression device is positioned on the first axial side of the drive plate and is configured to be attached to the drive plate, Equipped with, The drive plate has a disc portion and a first cylindrical portion extending axially from the outer peripheral end of the disc portion. Power transmission device.

2. The torque fluctuation suppression device has a contact surface facing radially outward, The aforementioned contact surface contacts the inner circumferential surface of the first cylindrical portion. The power transmission device according to claim 1.

3. The torque fluctuation suppression device has an annular portion extending in the circumferential direction, and a second cylindrical portion extending axially from the outer peripheral end of the annular portion. The first cylindrical portion overlaps with the second cylindrical portion in a radial view. The power transmission device according to claim 1.

4. The first cylindrical portion is arranged radially outward relative to the second cylindrical portion. The power transmission device according to claim 3.

5. The inner circumferential surface of the first cylindrical portion is in contact with the outer circumferential surface of the second cylindrical portion. The power transmission device according to claim 4.

6. The second cylindrical portion extends from the outer peripheral end of the annular portion toward the first axial direction, The power transmission device according to claim 3.

7. The torque fluctuation suppression device has a connecting portion extending radially outward from the tip of the second cylindrical portion, and a third cylindrical portion extending axially to the second side from the outer peripheral end of the connecting portion. The first cylindrical portion is positioned radially between the second cylindrical portion and the third cylindrical portion. The power transmission device according to claim 6.

8. The system further comprises a vibration-absorbing member positioned between the connecting portion and the first cylindrical portion in the axial direction. The power transmission device according to claim 7.

9. The system further comprises an inertia member configured to rotate integrally with the drive plate, The power transmission device according to claim 1.

10. The inertia member is positioned axially between the drive plate and the torque fluctuation suppression device. The power transmission device according to claim 9.

11. The inertia member is arranged so as to overlap with the first cylindrical portion in a radial view. The power transmission device according to claim 9.

12. The inertia member has a screw hole extending in the axial direction. The power transmission device according to claim 9.

13. The inertia member is a nut that is thicker than the thickness of the drive plate. The power transmission device according to claim 9.

14. The inertia member is an annular shape extending in the circumferential direction, The thickness of the inertia member is greater than the thickness of the drive plate. The power transmission device according to claim 9.

15. The torque fluctuation suppression device comprises at least one of a torque limiter and a damper unit. The torque limiter mentioned above is A first side plate configured to rotate integrally with the drive plate, A friction plate is arranged to be rotatable relative to the first side plate, A pressure plate that cooperates with the first side plate to clamp the friction plate, A biasing member that biases the pressure plate axially toward the first side plate, It has, The damper unit is, First rotating member and A second rotating member is arranged to be rotatable relative to the first rotating member, An elastic member that elastically connects the first rotating member and the second rotating member, has The power transmission device according to claim 1.

16. The torque limiter has a second side plate, The friction plate, the pressure plate, and the biasing member are arranged in the axial direction between the first side plate and the second side plate. The power transmission device according to claim 15.

17. The second side plate is positioned in the axial direction between the drive plate and the first side plate. The power transmission device according to claim 16.

18. The elastic member is positioned radially inward relative to the torque limiter. The power transmission device according to claim 15.

19. The torque fluctuation suppression device has an annular portion extending in the circumferential direction, The inner circumferential surface of the first cylindrical portion is in contact with the outer circumferential surface of the annular portion. The power transmission device according to claim 1.

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