Damping device and power transmission device

Abstract

The utility model relates to a damping device and power transmission device provide compact damping device. Damping device has first rotating part, second rotating part, elastic part and first friction part. First rotating part has along the circumference arrangement multiple first through -hole. Second rotating part has multiple second through -hole. Each second through -hole is when observing with the axial and corresponding each first through -hole overlap. Second rotating part is configured to be able to rotate with first rotating part. Elastic part links first rotating part and second rotating part elastically. First friction part is arranged between first rotating part and second rotating part. First friction part is constituted and slides with first rotating part in the radial inboard side to each first through -hole and each second through -hole. First friction part is constituted and rotates with second rotating part integrally.

Description

Technical Field

[0001] This utility model relates to a vibration reduction device and a power transmission device. Background Technology

[0002] The power transmission device is configured to absorb torque fluctuations from the engine. This power transmission device includes a flywheel, a torque limiter, and a vibration damping device (e.g., Patent Document 1). The vibration damping device is mounted on the flywheel via the torque limiter. The torque limiter is configured to restrict the transmission of torque exceeding a predetermined value between the flywheel and the vibration damping device.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2021-55810 Utility Model Content

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

[0007] In vibration damping devices like those described above, radial compactness is desirable. Therefore, the technical problem to be solved by this invention is to provide a vibration damping device that can be made compact.

[0008] Technical solutions for solving technical problems

[0009] The vibration damping device according to the first embodiment includes a first rotating component, a second rotating component, an elastic component, and a first friction component. The first rotating component has a plurality of first through holes arranged circumferentially. The second rotating component has a plurality of second through holes. Each second through hole overlaps with a corresponding first through hole when viewed axially. The second rotating component is configured to rotate relative to the first rotating component. The elastic component elastically connects the first rotating component and the second rotating component. The first friction component is disposed between the first rotating component and the second rotating component. The first friction component is configured to slide radially inward with respect to each first through hole and each second through hole. The first friction component is configured to rotate integrally with the second rotating component.

[0010] The inventors assemble a vibration damping device, a torque limiter, and a flywheel to manufacture a power transmission device, and designed to mount this assembled power transmission device onto a crankshaft. To mount the power transmission device onto the crankshaft, the flywheel is fastened to the crankshaft using bolts. To allow the bolts to pass through, through holes need to be formed in the first and second rotating components of the vibration damping device. Thus, with through holes formed in the first and second rotating components, to avoid interference between the friction components and the through holes, the vibration damping device needs to be radially enlarged.

[0011] In contrast, in the vibration damping device according to the first method described above, the first friction material is configured to slide radially inward relative to each of the first through holes and each of the second through holes. Therefore, the vibration damping device can be made more compact in the radial direction.

[0012] The vibration damping device according to the second embodiment is configured as follows, in the vibration damping device according to the first embodiment: A first friction member is mounted radially outward relative to the center of the second through hole on the second rotating member.

[0013] The vibration damping device according to the third embodiment is configured as follows, in contrast to the vibration damping device according to the first or second embodiment: A first friction member has a sliding portion and a plurality of arms. The sliding portion is annular. The sliding portion is arranged radially inward relative to each of the first through holes and each of the second through holes. The sliding portion is configured to slide against a first rotating member. Each arm extends radially outward from the sliding portion. The arms are spaced apart from each other in the circumferential direction. Each arm is mounted to a second rotating member at its front end.

[0014] The vibration damping device according to the fourth embodiment is configured as follows, in contrast to the vibration damping device according to the third embodiment: The second rotating component has a plurality of engaging holes. Each engaging hole is arranged radially outward relative to the center of each second through hole. Each arm has an engaging protrusion at its front end. Each engaging protrusion protrudes axially, thereby engaging with the engaging hole.

[0015] The vibration damping device according to the fifth method is configured as follows, in the vibration damping device according to the third or fourth method: Each arm extends radially between adjacent second through holes.

[0016] The vibration damping device according to the sixth embodiment is configured as follows, as in the vibration damping devices according to any of the first to fifth embodiments: A first rotating component has a first plate and a second plate arranged axially spaced apart. A second rotating component has a hub and a flange plate. The hub extends axially. The flange plate extends radially outward from the hub. The flange plate is axially disposed between the first plate and the second plate. A first friction component is disposed between the first plate and the flange plate. The first friction component slides against the first plate. The first friction component rotates integrally with the flange plate.

[0017] The vibration damping device according to the seventh embodiment further includes a second friction component compared to the vibration damping device according to the sixth embodiment. The second friction component is disposed between the second plate and the flange plate. The second friction component slides against the second plate. The second friction component rotates integrally with the flange plate.

[0018] The vibration damping device according to the eighth embodiment, in addition to the vibration damping device according to the sixth or seventh embodiment, also includes a disc spring. The disc spring applies force to the first friction member toward the first plate. The hub has a hub body, an annular protrusion, and multiple teeth. The hub body is cylindrical. The annular protrusion protrudes radially outward from the hub body. The annular protrusion extends circumferentially. Each tooth protrudes radially outward from the annular protrusion. The flange plate has multiple toothed grooves. Each tooth engages with its corresponding toothed groove. The disc spring and the annular protrusion abut against the first friction member.

[0019] The power transmission device according to the ninth embodiment is configured to be mounted on a crankshaft. The power transmission device includes a torque limiter, a vibration damping device according to any of the first to eighth embodiments, and a fastening component. The torque limiter includes a flywheel, a friction plate, a pressure plate, and a force-applying component. The flywheel has a base portion and a support portion. The support portion is spaced apart from the base portion and disposed on a first axial side. The friction plate is disposed between the base portion and the support portion. The pressure plate presses against the friction plate. The force-applying component applies force to the pressure plate towards the friction plate. The fastening component is configured to fasten the base component to the crankshaft. The fastening component protrudes axially through a first through hole and a second through hole.

[0020] Utility Model Effect

[0021] According to this utility model, the vibration damping device can be made more compact. Attached Figure Description

[0022] Figure 1 This is the front view of the power transmission device.

[0023] Figure 2 yes Figure 1 Sectional view along line II-II.

[0024] Figure 3 This is a front view of the vibration damping device with some components removed.

[0025] Figure 4 This is an enlarged sectional view of the power transmission device.

[0026] Figure 5 This is a three-dimensional view of the first friction component.

[0027] Figure 6 This is a front view of the vibration damping device with some components removed.

[0028] Figure 7 This is a cross-sectional view of the power transmission device before assembly.

[0029] Figure 8 This is a cross-sectional view of the power transmission device in a state where the applied force of the second disc spring is ineffective.

[0030] Explanation of reference numerals in the attached figures

[0031] 3: Torque limiter; 31: Flywheel; 311: Base; 312: Support; 32: Friction plate; 34: Pressure plate; 35: Second disc spring; 4: Vibration damping device; 41: Input rotating body; 41a: First plate; 412a: First through hole; 41b: Second plate; 412b: First through hole; 42: Output rotating body; 421: Hub; 421a: Hub body; 421b: Annular protrusion; 421c: Tooth; 422: Flange plate; 422a: Tooth groove; 422b: Engaging hole; 424: Second through hole; 43: Elastic component; 44: First friction component; 441: Sliding part; 442: Arm; 442a: Engaging protrusion; 45: First disc spring; 46: Second friction component; 5: First fastening component; 100: Power transmission device; 101: Crankshaft. Detailed Implementation

[0032] 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, axial direction first side means... Figure 2 The right side, the second side of the axis, means Figure 2 On the left side.

[0033] Figure 1 This is the front view of the power transmission device 100. Figure 2 yes Figure 1 Sectional view along line II-II. (See also...) Figure 1 as well as Figure 2 As shown, the power transmission device 100 includes a torque limiter 3, a vibration damping device 4, a plurality of first fastening components 5 (an example of fastening components), and a plurality of second fastening components 6. The torque limiter 3 and the vibration damping device 4 rotate substantially integrally with each other. The power transmission device 100 is positioned between the internal combustion engine (not shown) and the output-side component (not shown) in the torque transmission path. It should be noted that the output-side component refers to, for example, an electric motor or a transmission. The power transmission device 100 is mounted on the crankshaft 101. For example, in Figure 2 In this configuration, the internal combustion engine is located on the left side of the power transmission device 100, and the output-side components are located on the right side of the power transmission device 100. The power transmission device 100 is configured to limit the torque transmitted between the internal combustion engine and the output-side components, and to reduce torque fluctuations.

[0034] [Vibration damping device]

[0035] The vibration damping device 4 is mounted to the torque limiter 3 via the second fastening member 6. The vibration damping device 4 is configured to attenuate rotational fluctuations. The vibration damping device 4 has an input rotating body 41 (an example of a first rotating member), an output rotating body 42 (an example of a second rotating member), a plurality of elastic members 43, a first friction member 44, a first disc spring 45 (an example of a disc spring), and a second friction member 46.

[0036] <Input Rotation Solid>

[0037] The input rotating body 41 rotates integrally with the friction plate 32 of the torque limiter 3 (described later). The input rotating body 41 has a first plate 41a and a second plate 41b. Both the first plate 41a and the second plate 41b are annular components with 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 cannot move relative to each other along the axial direction.

[0038] The first plate 41a and the second plate 41b are arranged axially spaced apart from each other. The first plate 41a is arranged on the first side of the axial direction relative to the second plate 41b.

[0039] The first plate 41a and the second plate 41b each have a plurality of windows 411a and 411b. It should be noted that in this embodiment, the first plate 41a and the second plate 41b each have four windows 411a and 411b, but their number is not limited to this.

[0040] The windows 411a and 411b are spaced apart from each other in the circumferential direction. Each window 411a and 411b is configured to accommodate the elastic member 43.

[0041] The first plate 41a has a plurality of first through holes 412a. Each first through hole 412a is arranged circumferentially. Each first through hole 412a is arranged on the same circumference centered on the rotation axis O. Each first through hole 412a is arranged radially inward relative to the window portion 411a.

[0042] The second plate 41b has a plurality of first through holes 412b. Each first through hole 412b is arranged circumferentially. Each first through hole 412b is arranged on the same circumference centered on the rotation axis O. Each first through hole 412b is positioned radially inward relative to the window portion 411b. Each first through hole 412b of the second plate 41b is positioned at the same location as the first through hole 412a of the first plate 41a. That is, when viewed axially, each first through hole 412b of the second plate 41b is configured to overlap with each first through hole 412a of the first plate 41a.

[0043] The input rotating body 41 also has a plurality of third fastening components 41c. The third fastening components 41c fasten the first plate 41a and the second plate 41b at the outer periphery of the first plate 41a and the second plate 41b.

[0044] The third fastening member 41c is disposed on the first side of the axial direction relative to the support portion 312, which will be described later. When viewed along the axial direction, the third fastening member 41c overlaps with the support portion 312.

[0045] The third fastening component 41c is, for example, a rivet.

[0046] <Output Rotational Body>

[0047] The output rotating body 42 is configured to transmit torque from the input rotating body 41 to the output-side component. The output rotating body 42 is axially disposed between the first plate 41a and the second plate 41b. The output rotating body 42 is configured to be rotatable relative to the first plate 41a and the second plate 41b.

[0048] The output rotating body 42 has a hub 421 and a flange plate 422. Although the hub 421 and the flange plate 422 are constructed as separate components, they can also be formed as a single integral component. The hub 421 and the flange plate 422 rotate integrally.

[0049] The hub 421 is cylindrical. The hub 421 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.

[0050] Figure 3 This is a front view of the vibration damping device 4 with the first plate 41a and the first friction component 44 removed. Figure 2 as well as Figure 3 As shown, the hub 421 has a hub body portion 421a, an annular protrusion 421b, and a plurality of teeth 421c. The hub body portion 421a, the annular protrusion 421b, and the plurality of teeth 421c are integrally formed by a single component.

[0051] The hub body 421a is cylindrical. The hub body 421a extends axially. An annular protrusion 421b protrudes radially outward from the outer peripheral surface of the hub body 421a. The annular protrusion 421b is annular and extends circumferentially.

[0052] The teeth 421c are spaced apart from each other in the circumferential direction. Each tooth 421c is formed in the annular protrusion 421b. Specifically, each tooth 421c protrudes radially outward from the outer peripheral surface of the annular protrusion 421b. It should be noted that the annular protrusion 421b is thicker than each tooth 421c. Here, the thickness of the annular protrusion 421b and each tooth 421c refers to the axial dimension.

[0053] Flange 422 extends radially from the outer peripheral surface of hub 421. Flange 422 is formed in an annular shape. Flange 422 is configured to rotate relative to the first plate 41a and the second plate 41b. Flange 422 is axially disposed between the first plate 41a and the second plate 41b.

[0054] 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 is not limited to this number. 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 along the axial direction, each receiving hole 423 is arranged at a position overlapping with each window portion 411a, 411b.

[0055] Flange plate 422 has a plurality of second through holes 424. The second through holes 424 are arranged circumferentially. The second through holes 424 are arranged on the same circumference centered on the rotation axis O. The second through holes 424 are arranged radially inward relative to the receiving hole 423. The second through holes 424 of flange plate 422 are located in the same position as the corresponding first through holes 412a. That is, when viewed axially, the second through holes 424 of flange plate 422 overlap with the corresponding first through holes 412a.

[0056] The flange plate 422 has multiple teeth 422a. The teeth 421c are configured to engage with each tooth 422a.

[0057] Flange plate 422 has a plurality of engaging holes 422b. Each engaging hole 422b is arranged radially outward relative to the center of each second through hole 424. Furthermore, each engaging hole 422b is arranged circumferentially between an adjacent pair of second through holes 424. When viewed radially, each engaging hole 422b is arranged such that it does not overlap with each second through hole 424. When viewed radially, each engaging hole 422b is arranged such that it overlaps with its corresponding tooth 421c.

[0058] <Elastic Components>

[0059] The elastic member 43 is configured to elastically connect the input rotating body 41 and the output rotating body 42 in the rotational direction. The elastic member 43 is, for example, a helical spring.

[0060] The elastic member 43 is housed in the receiving hole 423 of the output rotating body 42. In addition, the elastic member 43 is housed in the window portion 411a of the first plate 41a and also in the window portion 411b of the second plate 41b.

[0061] <First Friction Component>

[0062] Figure 4 This is an enlarged sectional view of the power transmission device 100. (For example...) Figure 4 As shown, the first friction component 44 is axially disposed between the input rotating body 41 and the output rotating body 42. More specifically, the first friction component 44 is axially disposed between the first plate 41a and the flange plate 422.

[0063] The first friction member 44 slides radially inward with respect to each of the first through holes 412a and each of the second through holes 424 against the first plate 41a. The first friction member 44 is configured to rotate integrally with the output rotating body 42. More specifically, the first friction member 44 rotates integrally with the flange plate 422.

[0064] Figure 5 This is a perspective view of the first friction component 44. Figure 6 This is the front view of the vibration damping device 4 with the first plate 41a, etc., removed. Figure 5 as well as Figure 6 As shown, the first friction member 44 has a sliding portion 441 and a plurality of arms 442. It should be noted that in this embodiment, the first friction member 44 has three arms 442.

[0065] The sliding portion 441 is annular, extending circumferentially. The sliding portion 441 is disposed radially inward relative to each of the first through holes 412a and each of the second through holes 424. The sliding portion 441 does not protrude from each of the first through holes 412a toward the axial first side. The sliding portion 441 is configured to slide against the first plate 41a. The sliding portion 441 has a friction material 443 (see reference) on the surface where it slides against the first plate 41a. Figure 4 It should be noted that the sliding part 441 may also not have friction material 443. The inner peripheral surface of the sliding part 441 faces the outer peripheral surface of the hub body part 421a. Although the sliding part 441 and the outer peripheral surface of the hub body part 421a are arranged radially spaced apart, they may also abut against the outer peripheral surface of the hub body part 421a.

[0066] The sliding portion 441 has a stepped portion 444. Specifically, since the outer periphery of the sliding portion 441 is thicker than other portions, the stepped portion 444 is formed due to this thickness difference. It should be noted that the thickness of the sliding portion 441 refers to the axial dimension.

[0067] Each arm 442 extends radially outward from the sliding portion 441. Although each arm 442 is thinner than the sliding portion 441, it may also have the same thickness as the sliding portion 441. The arms 442 are spaced apart from each other in the circumferential direction. Each arm 442 extends radially between a pair of adjacent second through holes 424 in the circumferential direction.

[0068] Each arm 442 is mounted to the flange plate 422 at its front end. Each arm 442 has an engaging protrusion 442a at its front end. Each engaging protrusion 442a protrudes axially to a second side. Each engaging protrusion 442a engages with a corresponding engaging hole 422b. That is, the first friction member 44 is mounted to the flange plate 422 radially outward relative to the center of the second through hole 424.

[0069] <First Disc Reed>

[0070] like Figure 4 As shown, the first disc spring 45 applies force to the first friction member 44 towards the first plate 41a. The first disc spring 45 is axially disposed between the annular protrusion 421b of the hub 421 and the first friction member 44. Specifically, the inner peripheral end of the first disc spring 45 abuts against the annular protrusion 421b of the hub 421. The outer peripheral end of the first disc spring 45 abuts against the first friction member 44.

[0071] The outer peripheral surface of the first disc spring 45 abuts against the stepped portion 444 of the first friction member 44. That is, the first disc spring 45 is radially positioned by abutting against the stepped portion 444.

[0072] <Second Friction Component>

[0073] The second friction member 46 is axially disposed between the second plate 41b and the flange plate 422. The second friction member 46 slides radially inward with respect to each of the first through holes 412b and each of the second through holes 424 on the second plate 41b. The second friction member 46 has a friction material 461 on the surface that slides with the second plate 41b. It should be noted that the sliding part 441 may also not have a friction material 461.

[0074] The second friction member 46 is configured to rotate integrally with the output rotating body 42. Specifically, the second friction member 46 rotates integrally with the flange plate 422. It should be noted that the second friction member 46 abuts against the annular protrusion 421b. That is, the second friction member 46 is axially clamped by the second plate 41b and the annular protrusion 421b.

[0075] The second friction member 46 is formed with the same shape as the first friction member 44. That is, the second friction member 46 has an annular sliding portion and multiple arms. It should be noted that, unlike the first friction member 44, the second friction member 46 does not have a stepped portion. That is, the outer peripheral end of the second friction member 46 has the same thickness as the other parts. Engaging protrusions formed at the front ends of each arm of the second friction member 46 protrude axially to a first side.

[0076] The arms of the second friction member 46 are configured so as not to overlap with the arms 442 of the first friction member 44 when viewed axially. That is, the arms 442 of the first friction member 44 and the arms of the second friction member 46 are arranged alternately in the circumferential direction. In addition, on the flange plate 422, the engaging holes 422b for the first friction member 44 and the engaging holes 422b for the second friction member 46 are arranged alternately in the circumferential direction.

[0077] [Torque Limiter]

[0078] like Figure 2 As shown, the torque limiter 3 is configured to rotate around the rotation axis O. The torque limiter 3 is positioned on the second axial side relative to the damping device 4. The torque limiter 3 is annular. The torque limiter 3 is mounted to the crankshaft 101 by a plurality of first fastening members 5. It should be noted that each of the first fastening members 5 protrudes towards the first axial side. That is, in the unused power transmission device 100, when viewed axially, each of the first fastening members 5 overlaps with each of the first through holes 412a, 412b and each of the second through holes 424. The first fastening members 5 are, for example, bolts.

[0079] The torque limiter 3 is configured to limit the torque transmitted between the crankshaft 101 and the damping device 4. That is, the torque limiter 3 is configured to restrict the transmission of torque exceeding a specified value in the power transmission device 100.

[0080] The torque limiter 3 has a flywheel 31, a friction plate 32, a first friction material 33a, a second friction material 33b, a pressure plate 34, and a second disc spring 35 (an example of a force-applying component).

[0081] <Flywheel>

[0082] The flywheel 31 is mounted to the crankshaft 101 via multiple first fastening components 5. The flywheel 31 rotates integrally with the crankshaft 101.

[0083] The flywheel 31 has a base portion 311 and a support portion 312. The support portion 312 is mounted to the base portion 311 by a plurality of bolts 102. The support portion 312 rotates integrally with the base portion 311.

[0084] The base portion 311 is a circular plate with an opening in the center. The base portion 311 is mounted to the crankshaft 101 via a first fastening member 5. The base portion 311 has a plurality of through holes 311a and a plurality of engaging holes 311b. The through holes 311a are spaced apart from each other in the circumferential direction. Each through hole 311a extends through the base portion 311 axially.

[0085] The engagement holes 311b are spaced apart from each other in the circumferential direction. Each engagement hole 311b passes through the base portion 311 in the axial direction.

[0086] The support portion 312 is annular, extending circumferentially. The support portion 312 is disposed on a first axial side relative to the base portion 311. The support portion 312 is disposed axially spaced from the base portion 311. Specifically, the inner periphery of the support portion 312 is disposed axially spaced from the base portion 311. The outer periphery of the support portion 312 is in contact with the base portion 311. The outer periphery of the support portion 312 is mounted to the base portion 311.

[0087] The support portion 312 has a threaded hole 312a. The threaded hole 312a extends axially through the inner periphery of the support portion 312. The threaded hole 312a opens in the space between the inner periphery of the support portion 312 and the base portion 311. Through this threaded hole 312a, the second disc spring 35, described later, protrudes axially to a first side. That is, the threaded hole 312a is axially opposed to the second disc spring 35.

[0088] A friction plate 32, a first friction material 33a, a second friction material 33b, a pressure plate 34, and a second disc spring 35 are disposed between the base portion 311 and the support portion 312. The plate thickness of the support portion 312 is greater than that of the base portion 311.

[0089] <Friction Plate>

[0090] The friction plate 32 is an annular plate. The friction plate 32 is configured to rotate about the rotation axis O. The friction plate 32 is axially positioned between the base portion 311 and the support portion 312. Specifically, the friction plate 32 is clamped between the pressure plate 34 and the support portion 312. The friction plate 32 is frictionally engaged with the support portion 312 via a first friction material 33a. Furthermore, the friction plate 32 is frictionally engaged with the pressure plate 34 via a second friction material 33b.

[0091] Friction plate 32 is mounted on input rotating body 41. More specifically, friction plate 32 is mounted on second plate 41b. Friction plate 32 is mounted on second plate 41b by second fastening member 6. Friction plate 32 rotates integrally with input rotating body 41.

[0092] <Friction Materials>

[0093] The first friction material 33a is an annular shape extending circumferentially. The first friction material 33a is disposed on a first side in the axial direction relative to the friction plate 32. That is, the first friction material 33a is axially disposed between the friction plate 32 and the support portion 312. The first friction material 33a is mounted on the friction plate 32. The first friction material 33a rotates integrally with the friction plate 32.

[0094] The second friction material 33b is an annular shape extending circumferentially. The second friction material 33b is disposed on a second side in the axial direction relative to the friction plate 32. That is, the second friction material 33b is disposed axially between the friction plate 32 and the base portion 311. More specifically, the second friction material 33b is disposed between the friction plate 32 and the pressure plate 34. The second friction material 33b is mounted on the friction plate 32. The second friction material 33b rotates integrally with the friction plate 32.

[0095] <Pressure plate>

[0096] The pressure plate 34 is annular, extending circumferentially. The pressure plate 34 is configured to press against the friction plate 32. The pressure plate 34 presses against the friction plate 32 via the second friction material 33b. The pressure plate 34 is axially positioned between the second friction material 33b and the second disc spring 35.

[0097] The pressure plate 34 is configured to rotate integrally with the base portion 311. Specifically, the pressure plate 34 has a main body portion 341 and a plurality of engaging claws 342. The main body portion 341 is annular, extending circumferentially. Each engaging claw 342 extends from the inner circumferential end of the main body portion 341 toward a second side in the axial direction. Each engaging claw 342 engages with each engaging hole 311b. That is, each engaging claw 342 extends within each engaging hole 311b. Therefore, the pressure plate 34 rotates integrally with the base portion 311. It should be noted that the pressure plate 34 is capable of axial movement relative to the base portion 311.

[0098] <Second Disc Reed>

[0099] The second disc spring 35 is axially positioned between the base portion 311 and the pressure plate 34. The second disc spring 35 exerts force on the pressure plate 34 toward the friction plate 32. That is, the second disc spring 35 exerts force on the pressure plate 34 toward the first axial side. As a result, the friction plate 32, the first friction material 33a, and the second friction material 33b are clamped between the pressure plate 34 and the support portion 312.

[0100] The second disc spring 35 is a ring extending circumferentially. The second disc spring 35 has an outer circumferential end and an inner circumferential end. The second disc spring 35 abuts against the base portion 311 at its outer circumferential end and against the pressure plate 34 at its inner circumferential end. The outer diameter of the second disc spring 35 is larger than the outer diameter of the pressure plate 34. Therefore, the second disc spring 35 protrudes axially to a first side through the threaded hole 312a of the support portion 312. That is, the second disc spring 35 and the threaded hole 312a are axially opposed.

[0101] <Second Fastening Component>

[0102] The second fastening member 6 fastens the friction plate 32 to the input rotating body 41. Specifically, the second fastening member 6 fastens the friction plate 32 to the second plate 41b. The second fastening member 6 is configured to protrude axially to a second side via a through hole 311a. That is, the second fastening member 6 is axially opposed to the through hole 311a. The through hole 311a is sized such that the entire second fastening member 6 is exposed when viewed axially. In other words, the entire second fastening member 6 is exposed axially to a second side via the through hole 311a. Additionally, the second fastening member 6 is also exposed axially to a first side. That is, each component constituting the vibration damping device 4 has a through hole or cutout to prevent overlap with the second fastening member 6 when viewed axially. The second fastening member 6 is, for example, a rivet.

[0103] <Manufacturing Method>

[0104] Next, the manufacturing method of the power transmission device 100 configured as described above will be explained. First, as... Figure 7 As shown, the torque limiter 3 and the vibration damping device 4 are assembled separately. Then, the assembled torque limiter 3 and the vibration damping device 4 are combined together.

[0105] In detail, the friction plate 32 of the torque limiter 3 and the input rotating body 41 (particularly the second plate 41b) of the vibration damping device 4 are fastened by the second fastening member 6. At this time, the fastening operation is performed by passing through the through hole 311a formed in the base portion 311 (for example, flattening the head of the second fastening member 6). In this way, after the power transmission device 100 is assembled, the power transmission device 100 is mounted on the crankshaft 101 by the first fastening member 5. The first fastening member 5 is threadedly engaged with the crankshaft 101 by passing through the first through holes 412a, 412b and the second through hole 424.

[0106] When using the power transmission device 100 manufactured as described above, due to the activation of the torque limiter function of the torque limiter 3, the torque limiter 3 rotates relative to the vibration damping device 4, causing the first fastening member 5 to deviate from the position of each through hole 412a, 412b, 424, or the second fastening member 6 to deviate from the position of the through hole 311a. That is, sometimes the first fastening member 5 is not exposed to the first axial side through each through hole 412a, 412b, 424, or the second fastening member 6 is not exposed to the second axial side through the through hole 311a. Therefore, when disassembling the power transmission device 100 for maintenance or the like, it is necessary to align the positions of the first fastening member 5 with each through hole 412a, 412b, 424, and the second fastening member 6 with the through hole 311a.

[0107] In this case, such as Figure 8 As shown, firstly, the bolt 103 is screwed into the threaded hole 312a of the support part 312, and the second disc spring 35 is pressed axially to the second side on the front end face of the bolt 103. That is, the second disc spring 35 is pressed away from the pressure plate 34 by the bolt 103. As a result, the force exerted by the second disc spring 35 on the pressure plate 34 is released, and the clamping of the pressure plate 34 on the friction plate 32 is also released. As a result, the vibration damping device 4 can be easily rotated relative to the torque limiter 3, thereby enabling the alignment of the first fastening member 5 with each through hole 412a, 412b, 424, and the alignment of the second fastening member 6 with the through hole 311a.

[0108] [Variation Example]

[0109] The embodiments of this utility model have been described above, but this utility model is not limited thereto, and various modifications can be made within the scope of the spirit of this utility model. It should be noted that the following modifications can be applied simultaneously.

[0110] (a) In the above embodiment, although the first friction member 44 is mounted on the output rotating body 42, it can also be mounted on the input rotating body 41. That is, the first friction member 44 can also slide with the output rotating body 42. In this case, the output rotating body 42 is an example of the first rotating member, and the input rotating body 41 is an example of the second rotating member. In addition, in this case, it is preferable that the hub 421 and the flange plate 422 are integrally formed by a single component.

[0111] (b) In the above embodiment, the first friction component 44 is disposed between the first plate 41a and the flange plate 422, but the first friction component 44 may also be disposed between the second plate 41b and the flange plate 422.

Claims

1. A vibration damping device, characterized in that, have: The first rotating component has a plurality of first through holes arranged circumferentially; The second rotating component has a plurality of second through holes that overlap with each of the corresponding first through holes when viewed along the axial direction, and the second rotating component is configured to be able to rotate relative to the first rotating component. An elastic component elastically connects the first rotating component and the second rotating component; as well as A first friction component is disposed between the first rotating component and the second rotating component, and is configured to slide radially inward with respect to each of the first through holes and each of the second through holes, and rotate integrally with the second rotating component.

2. The vibration damping device according to claim 1, characterized in that, The first friction component is mounted radially outward relative to the center of the second through hole on the second rotating component.

3. The vibration damping device according to claim 1, characterized in that, The first friction component has: The annular sliding portion is arranged radially inward relative to each of the first through holes and each of the second through holes, and is configured to slide with the first rotating component; as well as Multiple arms extend radially outward from the sliding portion and are spaced apart from each other in the circumferential direction, the arms being mounted to the second rotating component at their front ends.

4. The vibration damping device according to claim 3, characterized in that, The second rotating component has a plurality of engaging holes arranged radially outward relative to the center of each of the second through holes. Each of the arm portions has an engaging protrusion at its front end that protrudes axially to engage with each of the engaging holes.

5. The vibration damping device according to claim 3, characterized in that, Each of the arms extends radially between adjacent second through holes.

6. The vibration damping device according to claim 1, characterized in that, The first rotating component has a first plate and a second plate arranged axially spaced apart. The second rotating component has a hub extending axially and a flange plate, the flange plate extending radially outward from the hub and disposed axially between the first plate and the second plate. The first friction component is disposed between the first plate and the flange plate, slides with the first plate, and rotates integrally with the flange plate.

7. The vibration damping device according to claim 6, characterized in that, The vibration damping device also includes a second friction component disposed between the second plate and the flange plate. The second friction component slides against the second plate and rotates integrally with the flange plate.

8. The vibration damping device according to claim 6, characterized in that, The vibration damping device also includes a disc spring, which applies force to the first friction component towards the first plate. The hub has: Cylindrical hub body; An annular protrusion protrudes radially outward from the hub body and extends circumferentially; as well as Multiple teeth protrude radially outward from the annular protrusion. The flange plate has multiple toothed grooves for each of the teeth to engage. The disc spring abuts against the annular protrusion and the first friction component.

9. A power transmission device, characterized in that, The power transmission device, configured to be mounted on the crankshaft, includes: Torque limiter; The vibration damping device according to any one of claims 1 to 8; and Fastening components, The torque limiter has: A flywheel having a base portion and a support portion, the support portion being spaced apart from the base portion and disposed on an axial first side; A friction plate is disposed between the base portion and the support portion; The pressure plate presses down on the friction plate; as well as The force-applying component applies force to the pressure plate towards the friction plate. The fastening component is configured to fasten the base component to the crankshaft and expose it axially through the first through hole and the second through hole.

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