Power transmission device

Abstract

A power transmission device capable of achieving low cost is provided. The power transmission device includes a drive plate and a torque fluctuation suppression device. The drive plate is configured to receive torque from a prime mover. The torque fluctuation suppression device is disposed on a first side in the axial direction relative to the drive plate. The torque fluctuation suppression device is configured to be mounted on the drive plate. The drive plate has a circular plate portion and a first cylindrical portion, the first cylindrical portion extending from the outer peripheral end of the circular plate portion toward the first side in the axial direction.

Description

Technical Field

[0001] This utility model relates to a power transmission device. 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 a flexible plate and an inertia ring. The torque limiter is mounted on the inertia ring.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2024-030506 Utility Model Content

[0006] Technical problem to be solved by the utility model

[0007] The present invention aims to provide a power transmission device that can achieve low cost.

[0008] Technical solutions for solving technical problems

[0009] The power transmission device according to the first embodiment includes a drive plate and a torque fluctuation suppression device. The drive plate is configured to receive torque from a prime mover. The torque fluctuation suppression device is disposed on a first side in the axial direction relative to the drive plate. The torque fluctuation suppression device is configured to be mounted on the drive plate. The drive plate has a circular plate portion and a first cylindrical portion. The first cylindrical portion extends from the outer peripheral end of the circular plate portion toward the first side in the axial direction.

[0010] According to this structure, the drive plate has a first cylindrical portion, which can therefore function as at least a part of the inertia ring. Thus, at least a part of the inertia ring can be omitted. It should be noted that the inertia ring is generally formed by casting, while the drive plate is generally formed by sheet metal processing or stamping of a metal sheet. Here, the drive plate formed by sheet metal processing or stamping is cheaper than the inertia ring formed by casting. Therefore, the power transmission device can be cost-effective.

[0011] In the power transmission device according to the first embodiment, the power transmission device according to the second embodiment is configured as follows: The torque variation suppression device has an abutment surface facing radially outward. The abutment surface abuts against the inner circumferential surface of the first cylindrical portion. According to this structure, the torque variation suppression device can be positioned via the first cylindrical portion.

[0012] In the power transmission device according to the first or second embodiment, the power transmission device according to the third embodiment is configured as follows: The torque variation suppression device has an annular portion and a second cylindrical portion. The annular portion extends circumferentially. 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 when viewed radially.

[0013] In the power transmission device according to the third embodiment, the power transmission device according to the fourth embodiment is configured as follows: The first cylindrical portion is arranged radially outward relative to the second cylindrical portion.

[0014] In the power transmission device according to the fourth embodiment, the power transmission device according to the fifth embodiment is configured as follows: The inner circumferential surface of the first cylindrical portion abuts against the outer circumferential surface of the second cylindrical portion.

[0015] In the power transmission devices according to the third to fifth embodiments, the power transmission device according to the sixth embodiment is configured as follows: The second cylindrical portion extends from the outer peripheral end of the annular portion toward a first side in the axial direction.

[0016] In the power transmission device according to the sixth embodiment, the power transmission device according to the seventh embodiment is configured as follows. The torque variation suppression device has a connecting portion and a third cylindrical portion. The connecting portion extends radially outward from the front end of the second cylindrical portion. The third cylindrical portion extends axially to a second side from the outer peripheral end of the connecting portion. A first cylindrical portion is radially disposed between the second and third cylindrical portions.

[0017] In the power transmission device according to the seventh embodiment, the power transmission device according to the eighth embodiment further includes a vibration absorbing component. The vibration absorbing component is axially disposed between the connecting portion and the first cylindrical portion.

[0018] In the power transmission device according to any of the first to eighth embodiments, the power transmission device according to the ninth embodiment further includes an inertial component. The inertial component is configured to rotate integrally with the drive plate.

[0019] In the power transmission device according to the ninth embodiment, the power transmission device according to the tenth embodiment is configured as follows: An inertial component is disposed axially between the drive plate and the torque variation suppression device.

[0020] In the power transmission device according to the ninth or tenth embodiment, the power transmission device according to the eleventh embodiment is configured as follows: The inertial component is configured to overlap with the first cylindrical portion when viewed radially.

[0021] In the power transmission device according to any of the ninth to eleventh embodiments, the power transmission device according to the twelfth embodiment is configured as follows: The inertial component has a threaded hole extending axially.

[0022] In the power transmission device involved in any of the ninth to twelfth embodiments, the power transmission device involved in the thirteenth embodiment is configured as follows: The inertial component is a nut that is thicker than the drive plate.

[0023] In the power transmission device according to any of the ninth to twelfth embodiments, the power transmission device according to the fourteenth embodiment is configured as follows: The inertial component is an annular shape extending circumferentially. The thickness of the inertial component is greater than the thickness of the drive plate.

[0024] Of the power transmission devices according to any of the first to fourteenth embodiments, the power transmission device according to the fifteenth embodiment is configured as follows: The torque variation suppression device has at least one of a torque limiter and a vibration damping unit. The torque limiter has a first side plate, a friction plate, a pressure plate, and a force-applying member. The first side plate is configured to rotate integrally with the drive 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 force to the pressure plate axially toward the first side plate. The vibration damping unit has a first rotating member, a second rotating member, and an elastic member. 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.

[0025] In the power transmission device according to the fifteenth embodiment, the power transmission device according to the sixteenth embodiment is configured as follows: The torque limiter has a second side plate. A friction plate, a pressure plate, and a force-applying component are axially disposed between the first side plate and the second side plate.

[0026] In the power transmission device according to the sixteenth embodiment, the power transmission device according to the seventeenth embodiment is configured as follows: The second side plate is disposed axially between the drive plate and the first side plate.

[0027] In any of the power transmission devices according to the fifteenth to the seventeenth embodiments, the power transmission device according to the eighteenth embodiment is configured as follows: The elastic member is disposed radially inward relative to the torque limiter.

[0028] Of the power transmission devices according to any of the first to eighteenth embodiments, the power transmission device according to the nineteenth embodiment is configured as follows: The torque variation suppression device has an annular portion extending circumferentially. The inner circumferential surface of the first cylindrical portion abuts against the outer circumferential surface of the annular portion.

[0029] Effects of the utility model

[0030] According to this utility model, the cost of power transmission devices can be reduced. Attached Figure Description

[0031] Figure 1 This is a top view of the power transmission device.

[0032] Figure 2 yes Figure 1 Sectional view along line II-II.

[0033] Figure 3 This is an enlarged sectional view of the power transmission device.

[0034] Figure 4 This is an enlarged cross-sectional view of the power transmission device involved in the modified example.

[0035] Figure 5 This is an enlarged cross-sectional view of the power transmission device involved in the modified example.

[0036] Figure 6 This is a top view of the power transmission device involved in the variation example.

[0037] Figure 7 yes Figure 6 Sectional view along line VII-VII.

[0038] Figure 8 This is a top view of the power transmission device involved in the variation example.

[0039] Figure 9 This is a cross-sectional view of the power transmission device involved in the modified example.

[0040] Figure 10 This is an enlarged cross-sectional view of the power transmission device involved in the modified example. Detailed Implementation

[0041] 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.

[0042] 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 2As shown, the power transmission device 100 includes a drive plate 2, a vibration absorption component 5, multiple inertial components 6, and a torque variation suppression device 110. The torque variation suppression device 110 includes a torque limiter 3 and a vibration damping 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 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.

[0043] 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 is, for example, an internal combustion engine. The output-side component is, 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 positioned 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 components, and to attenuate torque fluctuations.

[0044] [Driver Board]

[0045] The drive plate 2 is configured to receive torque from the prime mover. Specifically, the drive plate 2 is mounted to the crankshaft 102 by a plurality of bolts 101. The drive plate 2 is circular.

[0046] The drive plate 2 has a circular plate portion 21 and a first cylindrical portion 22. The circular plate portion 21 is configured to be mounted on the crankshaft 102. Specifically, the circular plate 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.

[0047] The first cylindrical portion 22 extends axially to a first side from the outer peripheral end of the circular plate portion 21. The first cylindrical portion 22 is formed by bending the outer peripheral portion of the drive plate 2. The drive plate 2 can be formed from steel sheet or the like, specifically from SPCC (cold-rolled steel sheet), SPHC (hot-rolled steel sheet), or SAPH (hot-rolled steel sheet for automotive structures). The drive plate 2 can be formed by sheet metal processing or stamping of the steel sheet. Specifically, the drive plate 2 can be formed by single stamping, sequential stamping, or multi-station continuous stamping. Therefore, the first cylindrical portion 22 has a plate thickness that is substantially the same as that of the circular plate portion 21. It should be noted that the plate thickness of the drive plate 2 can be, for example, set to approximately 2.0 to 8.0 mm.

[0048] [Torque Variation Suppression Device]

[0049] The torque variation suppression device 110 includes a torque limiter 3 and a vibration damping unit 4. The torque variation suppression device 110 is configured to suppress torque variation. The torque variation suppression device 110 is disposed on a first side in the axial direction relative to the drive plate 2. The torque variation suppression device 110 is configured to be mounted on the drive plate 2.

[0050] [Torque Limiter]

[0051] 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 2. The torque limiter 3 is annular. The torque limiter 3 is configured to be mounted on the drive plate 2.

[0052] The torque limiter 3 is configured to limit the torque transmitted between the drive plate 2 and the damping unit 4. That is, the torque limiter 3 is configured to control the transmission of torque exceeding a predetermined value in the power transmission device 100. The torque limiter 3 is disposed radially outward relative to the damping unit 4.

[0053] The torque limiter 3 has a first side plate 31, a second side plate 32, a friction plate 33, a pressure plate 34, and a force-applying component 35.

[0054] <First Side Panel>

[0055] The first side plate 31 is disposed on a first side in the axial direction relative to the drive plate 2. The first side plate 31 is mounted on the drive plate 2. Specifically, the first side plate 31 is mounted on the drive plate 2 via an inertial member 6 fixed to the drive plate 2.

[0056] The first side plate 31 and the second side plate 32 are fixed to the inertial component 6 by bolt 103 engaging with the threaded hole 61 of the inertial component 6. The first side plate 31 is annular.

[0057] Figure 3 This is an enlarged sectional view of the power transmission device 100. (See attached image.) Figure 3 As shown, 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 by a single component.

[0058] The annular portion 311 is annular, extending circumferentially. The annular portion 311 has a first inner peripheral portion 311a and a first outer peripheral portion 311b. The first inner peripheral portion 311a contacts the friction plate 33. The first inner peripheral portion 311a is disposed on a first side in the axial direction relative to the first outer peripheral portion 311b. The first outer peripheral portion 311b is disposed radially outward relative to the first inner peripheral portion 311a. The first outer peripheral portion 311b overlaps with the inertial member 6 when viewed axially.

[0059] The second cylindrical portion 312 extends axially from the outer peripheral end of the annular portion 311. Specifically, the second cylindrical portion 312 extends axially to a first side from the outer peripheral end of the annular portion 311. That is, the second cylindrical portion 312 extends axially from the outer peripheral end of the annular portion 311 away from 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 disposed radially inward relative to the first cylindrical portion 22. When viewed radially, the first cylindrical portion 22 overlaps with the second cylindrical portion 312. Specifically, the front end of the first cylindrical portion 22 overlaps with the second cylindrical portion 312 when viewed radially.

[0060] The connecting portion 313 extends radially outward from the front end of the second cylindrical portion 312. More specifically, the connecting portion 313 extends radially outward from the axial first end of the second cylindrical portion 312. The connecting portion 313 is annular, extending circumferentially. The connecting portion 313 connects the second cylindrical portion 312 and the third cylindrical portion 314. When viewed axially, the connecting portion 313 overlaps with the first cylindrical portion 22. The connecting portion 313 and the first cylindrical portion 22 are arranged axially spaced apart.

[0061] The third cylindrical portion 314 extends axially to a second side from the outer peripheral end of the connecting portion 313. That is, after bending the outer peripheral portion of the first side plate 31 axially to a first side to form the second cylindrical portion 312, its outer peripheral portion is further folded back axially to a second side to form the third cylindrical portion 314. Therefore, the third cylindrical portion 314 has a plate thickness substantially the same as the annular portion 311, the second cylindrical portion 312, and the connecting portion 313. It should be noted that the plate thickness of the first side plate 31 can be, for example, set to approximately 2.0 to 8.0 mm.

[0062] The third cylindrical portion 314 is disposed radially outward relative to the second cylindrical portion 312. The third cylindrical portion 314 is disposed radially spaced from the second cylindrical portion 312. The first cylindrical portion 22 is disposed radially between the second cylindrical portion 312 and the third cylindrical portion 314. Specifically, the front end of the first cylindrical portion 22 is disposed 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 when viewed radially. 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.

[0063] The inner circumferential surface of the first cylindrical portion 22 abuts against 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 abutting surface of this invention. The outer circumferential surface of the first cylindrical portion 22 is disposed spaced apart from the inner circumferential surface of the third cylindrical portion 314, but it may also abut against the inner circumferential surface of the third cylindrical portion 314. When the outer circumferential surface of the first cylindrical portion 22 abuts against the inner circumferential surface of the third cylindrical portion 314, the inner circumferential surface of the first cylindrical portion 22 may also be spaced apart from the outer circumferential surface of the second cylindrical portion 312.

[0064] The first side plate 31 can be formed from 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 periphery of the first side plate 31 axially. The first side plate 31 can be formed by sheet metal processing or stamping of the steel sheet. Specifically, the first side plate 31 can be formed by single stamping, sequential stamping, or multi-station continuous stamping.

[0065] <Second Side Panel>

[0066] The second side plate 32 is disposed on the second side of the axial direction relative to the first side plate 31. That is, the second side plate 32 is disposed axially between the drive plate 2 and the first side plate 31. In detail, the second side plate 32 is disposed within the space defined by the circular plate portion 21, the first cylindrical portion 22 and the annular portion 311.

[0067] A friction plate 33, a pressure plate 34, and a force-applying component 35 are disposed axially between the first side plate 31 and the second side plate 32. The thickness of the second side plate 32 is thinner than that of the first side plate 31.

[0068] 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 reference). Figure 2 Each fastening component 37 is arranged at intervals in the circumferential direction. The fastening component 37 is, for example, a rivet. Thus, the first side plate 31 and the second side plate 32, which are fastened by the fastening components 37, are fixed to the inertial component 6 by bolts 103.

[0069] The second side plate 32 has a second inner peripheral portion 321 and a second outer peripheral portion 322. The second inner peripheral portion 321 supports a force-applying member 35. The second inner peripheral portion 321 is disposed on a second side in the axial direction relative to the second outer peripheral portion 322. The second inner peripheral portion 321 is disposed axially spaced from the first inner peripheral portion 311a. A friction plate 33, a pressure plate 34, and a force-applying member 35 are disposed between the first inner peripheral portion 311a and the second inner peripheral portion 321 in the axial direction.

[0070] The second outer peripheral portion 322 is disposed radially outward relative to the second inner peripheral portion 321. The second outer peripheral portion 322 abuts against the first outer peripheral portion 311b in the axial direction. The second outer peripheral portion 322 is axially held by the first outer peripheral portion 311b and the inertial member 6.

[0071] The outer peripheral surface of the second side plate 32 faces the inner peripheral surface of the first cylindrical portion 22. The outer peripheral surface of the second side plate 32 can either abut against the inner peripheral surface of the first cylindrical portion 22 or be arranged at intervals.

[0072] <Friction Plate>

[0073] 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.

[0074] 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 311a 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.

[0075] Friction plate 33 is mounted on the first rotating component 41 of the vibration damping unit 4, which will be described later. 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 a plurality of fastening components 104. Friction plate 33 rotates integrally with the first rotating component 41. It should be noted that friction plate 33 is a different component from the second plate 41b, but friction plate 33 can also be integrally formed with the second plate 41b as a single component.

[0076] The friction plate 33 has a main body 331, a first friction member 332, and a second friction member 333. The main body 331 is annular, extending circumferentially. The first friction member 332 is mounted on a first axial side of the main body 331. The second friction member 333 is mounted on a second axial side of the main body 331. The first and second friction members 332 and 333 rotate integrally with the main body 331. The first and second friction members 332 and 333 are annular. The first and second friction members 332 and 333 are mounted on the outer periphery of the main body 331.

[0077] <Pressure plate>

[0078] The pressure plate 34 is annular. The pressure plate 34 is axially positioned between the force-applying component 35 and the friction plate 33. The pressure plate 34 and the first side plate 31 cooperate to clamp the friction plate 33. The first side plate 31 and the pressure plate 34 abut against the first and second friction components 332 and 333.

[0079] 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 protruding radially outward. These protrusions 341 engage with engagement holes formed in the second side plate 32, allowing the pressure plate 34 to rotate integrally with the second side plate 32 in a state where it can move axially relative to the second side plate 32. Since the second side plate 32 rotates integrally with the first side plate 31 and cannot move axially relative to it, the pressure plate 34 rotates integrally with the first side plate 31 and is capable of moving axially relative to the first side plate 31.

[0080] <Force-applying component>

[0081] The force-applying component 35 is axially disposed between the second side plate 32 and the pressure plate 34. The force-applying component 35 applies force to the pressure plate 34 towards the first axial direction. That is, the force-applying component 35 applies force to the pressure plate 34 towards the first side plate 31. Thus, the friction plate 33 is clamped between the pressure plate 34 and the first side plate 31. The force-applying component 35 is annular in shape extending circumferentially. The force-applying component 35 is, for example, a disc spring. The force-applying component 35 abuts against the second inner circumferential portion 321 at its outer circumferential end and against the pressure plate 34 at its inner circumferential end.

[0082] Vibration Absorption Components

[0083] The vibration absorbing component 5 is axially disposed between the connecting portion 313 and the first cylindrical portion 22. More specifically, the vibration absorbing component 5 is disposed 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.

[0084] The vibration absorbing component 5 is a ring extending circumferentially. The vibration absorbing component 5 is, for example, an O-ring. The vibration absorbing component 5 is compressed axially.

[0085] [Inertial Components]

[0086] The inertial component 6 is disposed on a first side of the drive plate 2 in the axial direction. The inertial component 6 is disposed on a second side of the drive plate 31 in the axial direction. The inertial component 6 is configured to rotate integrally with the drive plate 2. Specifically, the inertial component 6 is fixed to the drive plate 2 by welding. The inertial component 6 is fixed to the outer periphery of the drive plate 2. The inertial components 6 are arranged at intervals from each other in the circumferential direction.

[0087] When viewed radially, the inertial component 6 overlaps with the first cylindrical portion 22 and the third cylindrical portion 314. Specifically, the inertial component 6 faces the inner circumferential surface of the first cylindrical portion 22. When viewed axially, the inertial component 6 overlaps with the annular portion 311. Specifically, when viewed axially, the inertial component 6 overlaps with the first outer circumferential portion 311b.

[0088] When viewed axially, the inertial component 6 overlaps with the second side plate 32. More specifically, when viewed axially, the inertial component 6 overlaps with the second outer periphery 322. The inertial component 6 and the second outer periphery 322 are opposite each other. It should be noted that other components may also be sandwiched between the inertial component 6 and the second outer periphery 322.

[0089] The inertial component 6 is axially disposed between the drive plate 2 and the first side plate 31. More specifically, the inertial component 6 is axially sandwiched between the drive plate 2 and the second side plate 32. More specifically, the inertial component 6 is axially sandwiched between the circular plate portion 21 and the second outer peripheral portion 322.

[0090] The inertial component 6 is, for example, a nut. The inertial component 6 is thicker than the first side plate 31. Furthermore, the inertial component 6 is thicker than the drive plate 2. It should be noted that the thickness of the inertial component 6 refers to the axial dimension.

[0091] The inertial component 6 has a threaded hole 61 extending axially. The threaded hole 61 opens on a first side in the axial direction. It should be noted that, in this embodiment, since the threaded hole 61 passes through the inertial component 6 axially, it also opens on a second side in the axial direction. The bolt 103 engages with the threaded hole 61 of the inertial component 6. Thus, the first side plate 31 and the second side plate 32 are mounted to the drive plate 2 via the inertial component 6.

[0092] [Vibration Damping Unit]

[0093] 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 component 41, a second rotating component 42, and a plurality of elastic components 43.

[0094] <First Rotating Component>

[0095] The first rotating component 41 rotates integrally with the friction plate 33 of the torque limiter 3. The first rotating component 41 has a first plate 41a and a second plate 41b. Both the first plate 41a and the second plate 41b are annular components 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. The first plate 41a and the second plate 41b are fastened to each other by a plurality of fastening components 106.

[0096] 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.

[0097] 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.

[0098] The windows 411a and 411b are arranged at intervals in the circumferential direction. Each window 411a and 411b is configured to accommodate the elastic member 43.

[0099] The outer periphery of the first rotating component 41 is disposed radially outward relative to the outer periphery of the friction plate 33. That is, the outer diameter of the first rotating component 41 is larger than the outer diameter of the friction plate 33. The outer periphery of the first rotating component 41 overlaps with the friction surfaces of the friction plate 33 and the first side plate 31 when viewed axially. The outer periphery of the first rotating component 41 is disposed on the first side in the axial direction relative to the torque limiter 3.

[0100] <Second Rotating Component>

[0101] 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.

[0102] The second rotating component 42 has a hub 421 and a flange plate 422. The hub 421 and the flange plate 422 are configured as separate components, but they can also be integrally formed as a single component.

[0103] 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 be splined into this spline hole.

[0104] 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.

[0105] 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 this number is not limited to this. The receiving holes 423 are arranged spaced apart from each other in the circumferential direction. Each receiving hole 423 is configured to receive an elastic member 43. When viewed axially, each receiving hole 423 is positioned to overlap with each window portion 411a, 411b.

[0106] <Elastic Components>

[0107] 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.

[0108] The elastic member 43 is received in the receiving hole 423 of the second rotating member 42. Furthermore, the elastic member 43 is received in both the window portion 411a of the first plate 41a and the window portion 411b of the second plate 41b. The elastic member 43 is disposed radially inward relative to the torque limiter 3.

[0109] [Variation Example]

[0110] The embodiments of this utility model have been described above, but this utility model is not limited thereto. Various modifications can be made as long as they do not depart from the spirit of this utility model. It should be noted that the following variations can be applied simultaneously.

[0111] (a) In the above embodiment, the first side plate 31 has a second cylindrical portion 312, a connecting portion 313, and a third cylindrical portion 314, but the structure of the first side plate 31 is not limited thereto. For example, such as Figure 4 As shown, the first side plate 31 may also lack the connecting portion 313 and the third cylindrical portion 314. That is, the second cylindrical portion 312 may also be the outer peripheral end of the first side plate 31. It should be noted that the first side plate 31 may also lack the second cylindrical portion 312.

[0112] (b) In the above embodiment, the second cylindrical portion 312 extends axially from the annular portion 311 to the first side, but the structure of the first side plate 31 is not limited thereto. For example, as Figure 5 As shown, the second cylindrical portion 312 of the first side plate 31 may also extend axially to a second side from the annular portion 311. In this case, the first cylindrical portion 22 may also be disposed radially inward relative to the second cylindrical portion 312. Furthermore, the outer peripheral surface of the first cylindrical portion 22 may also abut against the inner peripheral surface of the second cylindrical portion 312.

[0113] (c) In the above embodiment, the inertial component 6 is fixed to the drive plate 2 by welding, but the method of fixing the inertial component 6 is not limited to welding. For example, such as Figure 6 as well as Figure 7As shown, the inertial component 6 can also be fixed to the drive plate 2 by bolts 105. Specifically, the inertial component 6 has a first threaded hole 61 and a second threaded hole 62. It should be noted that in this modified example, the inertial component 6 has one first threaded hole 61 and two second threaded holes 62. The first threaded hole 61 and the second threaded hole 62 can have the same diameter or different diameters. The inertial component 6 is fixed to the drive plate 2 by bolts 105 threadedly engaging with the second threaded holes 62. In addition, the inertial component 6 is fixed to the first side plate 31 by bolts 103 threadedly engaging with the first threaded hole 61. As a result, the first side plate 31 is fixed to the drive plate 2 via the inertial component 6.

[0114] (d) In the above embodiment, the second side plate 32 is disposed on the second side of the axial direction relative to the first side plate 31, but the structure of the torque limiter 3 is not limited to this. For example, the second side plate 32 may also be disposed on the first side of the axial direction relative to the first side plate 31.

[0115] (e) In the above embodiment, the inertial component 6 is constituted by a nut, but the structure of the inertial component 6 is not limited to this. For example, as Figure 8 As shown, the inertial component 6 can also be a ring extending circumferentially. The thickness of the inertial component 6 is greater than the thickness of the first side plate 31. In addition, the thickness of the inertial component 6 is greater than the thickness of the drive plate 2.

[0116] (f) In the above embodiment, the torque variation suppression device 110 has a torque limiter 3 and a vibration damping unit 4, but the structure of the torque variation suppression device 110 is not limited thereto. For example, as Figure 9 As shown, the torque variation suppression device 110 may also be without the torque limiter 3. In this case, the damping unit 4 is mounted on the drive plate 2. In this case, the first rotating component 41 of the damping unit 4 is mounted to the inertial component 6 by bolts 103.

[0117] In addition to the first plate 41a and the second plate 41b, the first rotating component 41 also has a mounting plate 41c. The mounting plate 41c is mounted to the inertial component 6 by bolts 103.

[0118] Mounting plate 41c is axially disposed between first plate 41a and second plate 41b. Mounting plate 41c is configured to rotate integrally with first plate 41a and second plate 41b. Mounting plate 41c is fastened to first plate 41a and second plate 41b by fastening member 106. Mounting plate 41c is annular in shape extending circumferentially.

[0119] The mounting plate 41c has an annular portion 411c, a second cylindrical portion 412c, a connecting portion 413c, and a third cylindrical portion 414c. It should be noted that since the annular portion 411c, the second cylindrical portion 412c, the connecting portion 413c, and the third cylindrical portion 414c of the mounting plate 41c are equivalent 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, detailed descriptions are omitted. The inner circumferential surface of the first cylindrical portion 22 abuts against 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 abutting surface of this invention.

[0120] Mounting plate 41c is configured to overlap flange plate 422 when viewed radially. The thickness of mounting plate 41c can be set to be the same as the thickness of flange plate 422. For example, flange plate 422 and mounting plate 41c can be taken from a single plate.

[0121] It should be noted that the torque variation suppression device 110 may also have only the torque limiter 3 without the vibration damping unit 4.

[0122] (g) such as Figure 10 As shown, the torque variation suppression device 110 may also omit the second cylindrical portion 312. In this case, the outer peripheral surface of the annular portion 311 abuts against the inner peripheral surface of the first cylindrical portion 22. That is, the outer peripheral surface of the annular portion 311 corresponds to the abutting surface of this invention.

[0123] Explanation of reference numerals in the attached figures

[0124] 2: Driver board

[0125] 21: Circular plate section

[0126] 22: First cylindrical section

[0127] 3: Torque limiter

[0128] 31: First side plate

[0129] 311: Circular portion

[0130] 312: Second cylindrical section

[0131] 313: Connecting Part

[0132] 314: Third cylindrical section

[0133] 32: Second side panel

[0134] 33: Friction plate

[0135] 34: Pressure plate

[0136] 35: Force-applying components

[0137] 4: Vibration damping unit

[0138] 41: First rotating component

[0139] 42: Second rotating component

[0140] 43: Elastic component

[0141] 5: Vibration Absorption Components

[0142] 6: Inertial components

[0143] 61: Threaded hole

[0144] 100: Power transmission device

[0145] 110: Torque variation suppression device.

Claims

1. A power transmission device, characterized in that, have: The drive plate is configured to receive torque from the prime mover; and A torque variation suppression device is disposed on a first side in the axial direction relative to the drive plate and is configured to be mounted on the drive plate. The drive plate has a circular plate portion and a first cylindrical portion, the first cylindrical portion extending from the outer peripheral end of the circular plate portion toward a first side in the axial direction.

2. The power transmission device according to claim 1, characterized in that, The torque variation suppression device has an abutment surface facing radially outward. The contact surface abuts against the inner circumferential surface of the first cylindrical portion.

3. The power transmission device according to claim 1, characterized in that, The torque variation suppression device has: an annular portion extending circumferentially; and a second cylindrical portion extending axially from the outer peripheral end of the annular portion. When viewed radially, the first cylindrical portion overlaps with the second cylindrical portion.

4. The power transmission device according to claim 3, characterized in that, The first cylindrical portion is positioned radially outward relative to the second cylindrical portion.

5. The power transmission device according to claim 4, characterized in that, The inner circumferential surface of the first cylindrical portion abuts against the outer circumferential surface of the second cylindrical portion.

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

7. The power transmission device according to claim 6, characterized in that, The torque variation suppression device includes: a connecting portion extending radially outward from the front end of the second cylindrical portion; and a third cylindrical portion extending axially to a second side from the outer peripheral end of the connecting portion. The first cylindrical portion is radially disposed between the second cylindrical portion and the third cylindrical portion.

8. The power transmission device according to claim 7, characterized in that, The power transmission device also includes a vibration absorption component, which is axially disposed between the connecting portion and the first cylindrical portion.

9. The power transmission device according to claim 1, characterized in that, The power transmission device also includes an inertial component, which is configured to rotate integrally with the drive plate.

10. The power transmission device according to claim 9, characterized in that, The inertial component is disposed axially between the drive plate and the torque variation suppression device.

11. The power transmission device according to claim 9, characterized in that, The inertial component is configured to overlap with the first cylindrical portion when viewed radially.

12. The power transmission device according to claim 9, characterized in that, The inertial component has a threaded hole extending axially.

13. The power transmission device according to claim 9, characterized in that, The inertial component is a nut that is thicker than the drive plate.

14. The power transmission device according to claim 9, characterized in that, The inertial component is a ring extending circumferentially. The thickness of the inertial component is greater than that of the drive plate.

15. The power transmission device according to claim 1, characterized in that, The torque variation suppression device has at least one of a torque limiter and a vibration damping unit. The torque limiter has: The first side plate is configured to rotate integrally with the drive 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; and The force-applying component applies force axially toward the first side plate to the pressure plate. The vibration damping unit has: First rotating component; The second rotating component is configured to rotate relative to the first rotating component; and An elastic component elastically connects the first rotating component and the second rotating component.

16. The power transmission device according to claim 15, characterized in that, The torque limiter has a second side plate. The friction plate, the pressure plate, and the force-applying component are axially disposed between the first side plate and the second side plate.

17. The power transmission device according to claim 16, characterized in that, The second side plate is axially disposed between the drive plate and the first side plate.

18. The power transmission device according to claim 15, characterized in that, The elastic member is disposed radially inward relative to the torque limiter.

19. The power transmission device according to claim 1, characterized in that, The torque variation suppression device has an annular portion extending circumferentially. The inner circumferential surface of the first cylindrical portion abuts against the outer circumferential surface of the annular portion.

Images