Damping device and power transmission device

Abstract

This utility model relates to a vibration damping device and a power transmission device. It reduces the area covered by friction components in a first rotating component and a second rotating component. The first friction component is arranged radially spaced from the outer peripheral surface of the hub. The flange plate includes multiple support surfaces. Each support surface is a radially outward-facing surface that defines a receiving hole. The first friction component has a sliding portion and multiple protrusions. The sliding portion is disposed between the first rotating component and the flange plate. The sliding portion is annular, extending circumferentially. Each protrusion protrudes axially from the sliding portion and is disposed within a receiving hole. Each protrusion is supported by a support surface.

Description

Technical Field

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

[0002] The vibration damping device includes a clutch plate, a flange plate, and friction components. The friction components are positioned between the clutch plate and the flange plate. The friction components suppress resonance by sliding against the clutch plate or the flange plate. The friction components are supported by the outer circumferential surface of the wheel hub.

[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] As described above, since the friction component is supported by the outer circumferential surface of the hub, increasing the outer diameter of the friction component also increases the area covered by the friction component for both the first and second rotating components. Therefore, it is difficult to form through holes or similar structures for the vibration damping device. Thus, the technical problem this invention aims to solve is to reduce the area covered by the friction component for both the first and second rotating components.

[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, multiple elastic components, and a first friction component. The first rotating component has multiple windows. The second rotating component is configured to rotate relative to the first rotating component. The second rotating component has a flange plate and a hub. The flange plate includes multiple receiving holes. The hub is a cylindrical shape extending axially. Each elastic component is disposed in each window and each receiving hole. Each elastic component elastically connects the first rotating component and the second rotating component. The first friction component is disposed radially spaced from the outer peripheral surface of the hub. The flange plate includes multiple support surfaces. Each support surface is a radially outward-facing surface among the surfaces defining each receiving hole. The first friction component has a sliding portion and multiple protrusions. The sliding portion is disposed between the first rotating component and the flange plate. The sliding portion is annular, extending circumferentially. Each protrusion protrudes axially from the sliding portion and is disposed within each receiving hole. Each protrusion is supported by a support surface.

[0010] With this configuration, since the protrusion is supported by the support surface, it is not necessary to support the first friction member via the hub. Therefore, the first friction member can be positioned spaced apart from the outer peripheral surface of the hub. As a result, the area covered by the first friction member can be reduced.

[0011] The vibration damping device according to the second embodiment is configured as follows, in contrast to the vibration damping device according to the first embodiment: A first rotating component has a plurality of first through holes. The first through holes are arranged circumferentially. A second rotating component has a plurality of second through holes. When viewed axially, each second through hole overlaps with its corresponding first through hole. A first friction component is disposed radially outward relative to each of the first and second through holes.

[0012] The vibration damping device involved in the third method is configured as follows, in the vibration damping device involved in the first or second method: When viewed along the axial direction, each support surface is an arc centered on the axis of rotation.

[0013] The vibration damping device according to the fourth method is configured as follows, compared to the vibration damping device according to the third method: Each protrusion has an inner abutment surface that contacts each support surface. When viewed axially, each inner abutment surface is an arc shape centered on the axis of rotation.

[0014] The vibration damping device according to the fifth embodiment is configured as follows, as in the vibration damping devices according to any of the first to fourth embodiments: The flange plate includes multiple stop surfaces. Each stop surface is a circumferentially oriented surface among the surfaces defining each receiving hole. Each protrusion has multiple abutment surfaces. Each abutment surface faces each stop surface circumferentially.

[0015] The vibration damping device according to the sixth embodiment is configured as follows, compared to the vibration damping device according to the fifth embodiment: Each protrusion has an inner abutment surface that contacts each support surface. Each abutment surface is separate from the inner abutment surface.

[0016] The vibration damping device according to the seventh method is configured as follows, in any of the vibration damping devices according to the first to sixth methods: Each protrusion has a cavity inside.

[0017] The vibration damping device according to the eighth embodiment is configured as follows, compared to the vibration damping device according to the seventh embodiment: Each cavity extends axially. Each cavity opens at the front end of the protrusion and is blocked at the base end of the protrusion.

[0018] The vibration damping device according to the ninth embodiment, in any of the vibration damping devices according to the first to eighth embodiments, further includes an intermediate plate. The intermediate plate is configured to rotate relative to the first rotating member and the second rotating member. The intermediate plate has a receiving portion for accommodating each elastic member. The first friction member is configured to rotate integrally with the intermediate plate. A flange plate is disposed between the first friction member and the intermediate plate.

[0019] The vibration damping device according to the tenth embodiment further includes a second friction member compared to the vibration damping device according to the ninth embodiment. The second friction member is configured to rotate integrally with the first rotating member. The second friction member is also configured to slide against the intermediate plate.

[0020] The vibration damping device according to the eleventh embodiment is configured as follows, in contrast to the vibration damping device according to the tenth embodiment: The intermediate plate has an engaging recess. The first friction member has an engaging protrusion that engages with the engaging recess. The second friction member has an annular recess extending circumferentially on its surface facing the intermediate plate. The annular recess is opposite to both the engaging protrusion and the engaging recess.

[0021] The power transmission device according to the twelfth embodiment is configured to be mounted on a crankshaft. The power transmission device includes a torque limiter, a vibration damping device according to the second embodiment, 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 first and second through holes.

[0022] Utility Model Effect

[0023] According to this invention, the area covered by the friction component can be reduced. Attached Figure Description

[0024] Figure 1 This is the front view of the power transmission device.

[0025] Figure 2 yes Figure 1 Sectional view along line II-II.

[0026] Figure 3 This is the front view of the vibration damping device with some components removed.

[0027] Figure 4 yes Figure 3 Enlarged image.

[0028] Figure 5 yes Figure 2 Enlarged image.

[0029] Figure 6 This is a three-dimensional view of the first friction component.

[0030] Figure 7 This is the front view of the vibration damping device with some components removed.

[0031] Figure 8 This is a front view of the vibration damping device with some components removed.

[0032] Figure 9 This is a cross-sectional view of the power transmission device before assembly.

[0033] Figure 10This is a cross-sectional view of the power transmission device in a state where the applied force of the second disc spring is ineffective.

[0034] Explanation of reference numerals in the attached figures

[0035] 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; 411a: Window; 411b: Window; 412a: First through hole; 42: Output rotating body; 421: Hub; 422: Flange plate; 423: Receiving hole; 424: Second through hole; 425: Support surface; 426: Stop surface 43: Elastic component; 44: First friction component; 441: Sliding part; 442: Protrusion; 442a: Inner abutment surface; 442b: Abutment surface; 442c: Abutment surface; 442d: Hollow part; 443: Engaging protrusion; 45: Intermediate plate; 451: Engaging recess; 452: Receiving part; 46: Second friction component; 462: Annular recess; 5: First fastening component; 100: Power transmission device; 101: Crankshaft. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] [Vibration damping device]

[0039] The vibration damping device 4 is mounted on 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), multiple elastic members 43, a first friction member 44, an intermediate plate 45, a second friction member 46, and a first disc spring 47.

[0040] <Input Rotation Solid>

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] The third fastening component 41c is, for example, a rivet.

[0050] <Output Rotational Body>

[0051] 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.

[0052] 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.

[0053] 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 spline into this spline hole.

[0054] Figure 3 This is a front view of the vibration damping device 4 with the first plate 41a, intermediate plate 45, second friction component 46, and first disc spring 47 removed. Figure 2 as well as Figure 3 As shown, flange plate 422 extends radially from the outer peripheral surface of hub 421. Flange plate 422 is formed in an annular shape. Flange plate 422 is configured to rotate relative to the first plate 41a and the second plate 41b. Flange plate 422 is axially disposed between the first plate 41a and the second plate 41b.

[0055] The flange plate 422 has a plurality of receiving holes 423. It should be noted that, although the flange plate 422 has four receiving holes 423 in this embodiment, the 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 along the axial direction, each receiving hole 423 is arranged at a position overlapping with each window portion 411a, 411b.

[0056] Figure 4 yes Figure 3An enlarged image. For example... Figure 4 As shown, the flange plate 422 has multiple support surfaces 425. Each support surface 425 is a radially outward-facing surface among the surfaces defining the receiving hole 423. When viewed axially, each support surface 425 is an arc centered on the rotation axis O. All support surfaces 425 are arranged on the same circumference centered on the rotation axis O.

[0057] Flange plate 422 has multiple stop surfaces 426. The stop surfaces 426 are circumferentially oriented surfaces among the surfaces defining the receiving hole 423. Flange plate 422 has two stop surfaces 426 in one receiving hole 423.

[0058] like Figure 2 as well as Figure 3 As shown, the 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 the flange plate 422 are located at the same position as the corresponding first through holes 412a. That is, the second through holes 424 of the flange plate 422 overlap with the corresponding first through holes 412a when viewed axially.

[0059] <Elastic Components>

[0060] 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.

[0061] The elastic member 43 is housed in the receiving hole 423 of the output rotating body 42. Additionally, 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. Furthermore, it is also housed in the receiving portion 452 of the intermediate plate 45, which will be described later.

[0062] <First Friction Component>

[0063] Figure 5 This is an enlarged sectional view of the power transmission device 100. (See attached image.) Figure 5 As shown, the first friction member 44 is arranged radially spaced from the outer peripheral surface of the hub 421. Specifically, the first friction member 44 is arranged radially outward relative to each of the first through holes 412a, 412b and each of the second through holes 424. Thus, the first friction member 44 does not cover each of the first through holes 412a, 412b and each of the second through holes 424. That is, the first friction member 44 does not overlap with each of the first through holes 412a, 412b and each of the second through holes 424 when viewed axially.

[0064] The first friction member 44 is configured to rotate relative to the input rotating body 41. That is, the first friction member 44 is configured to rotate relative to the second plate 41b. In addition, the first friction member 44 is capable of rotating relative to the flange plate 422 within a predetermined angle range. The first friction member 44 is configured to generate friction by sliding with the second plate 41b through relative rotation with the second plate 41b.

[0065] Figure 6 This is a perspective view of the first friction component 44. (See diagram below.) Figure 5 as well as Figure 6 As shown, the first friction member 44 has a sliding portion 441, a plurality of protrusions 442, and a plurality of engaging protrusions 443. The sliding portion 441, the plurality of protrusions 442, and the plurality of engaging protrusions 443 are integrally formed by a single component. It should be noted that the first friction member 44 can be formed, for example, by PA66-GF30 or the like.

[0066] The sliding portion 441 is annular, extending circumferentially. The sliding portion 441 is axially disposed between the input rotating body 41 and the flange plate 422. More specifically, the sliding portion 441 is axially disposed between the second plate 41b and the flange plate 422. The sliding portion 441 is configured to slide with the input rotating body 41. Specifically, when the sliding portion 441 rotates relative to the second plate 41b, it slides with the second plate 41b, generating friction. Although the sliding portion 441 does not have friction material, it may have friction material on the surface in contact with the second plate 41b.

[0067] Each protrusion 442 protrudes from the sliding portion 441 toward the first side in the axial direction. Each protrusion 442 is disposed within each receiving hole 423. The front end of each protrusion 442 (the first side end in the axial direction) extends beyond the receiving hole 423 and is located in the space between the flange plate 422 and the first plate 41a.

[0068] like Figure 4 as well as Figure 6 As shown, each protrusion 442 is supported by a support surface 425. Specifically, each protrusion 442 has an inner abutment surface 442a that contacts the support surface 425. When viewed axially, each inner abutment surface 442a is arc-shaped about the rotation axis O. Each inner abutment surface 442a follows the shape of its corresponding support surface 425. The curvature of each inner abutment surface 442a is approximately the same as the curvature of each support surface 425. Supported by the support surfaces 425, the protrusions 442 are radially positioned. As the first friction member 444 rotates relative to the flange plate 422, each protrusion 442 slides on the support surface 425.

[0069] Each protrusion 442 has a pair of abutment surfaces 442b and 442c. Each abutment surface 442b and 442c is circumferentially opposed to the corresponding stop surface 426. When the first friction member 44 rotates relative to the flange plate 422, each abutment surface 442b and 442c abuts against each stop surface 426.

[0070] In this way, the first friction component 44 can rotate relative to the flange plate 422 within an angle range up to the point where each abutment surface 442b, 442c abuts against each stop surface 426. That is, when the torsion angle between the input rotating body 41 and the output rotating body 42 is within a specified range, each abutment surface 442b, 442c does not abut against each stop surface 426. Therefore, the first friction component 44 rotates relative to the flange plate 422, and on the other hand, rotates integrally with the second plate 41b, without generating friction between the first friction component 44 and the second plate 41b.

[0071] On the other hand, when the torsion angle between the input rotating body 41 and the output rotating body 42 exceeds the specified range, the abutting surfaces 442b and 442c abut against the stopping surfaces 426. Therefore, the first friction member 44 rotates integrally with the flange plate 422, and on the other hand, rotates relative to the second plate 41b, generating friction between them.

[0072] Each abutment surface 442b, 442c is separated from the inner abutment surface 442a. That is, each abutment surface 442b, 442c is not continuously connected to the inner abutment surface 442a.

[0073] Each protrusion 442 has a plurality of cavities 442d inside. Each cavity 442d extends axially. Each cavity 442d opens at the front end (first axial end) of each protrusion 442. In addition, each cavity 442d is blocked at the base end (second axial end) of each protrusion 442.

[0074] Each engaging protrusion 443 protrudes from the front end of each protrusion 442 toward a first side facing the axial direction. Each engaging protrusion 443 is disposed on the first side facing the axial direction relative to the flange plate 422.

[0075] <Intermediate Board>

[0076] like Figure 5 As shown, the intermediate plate 45 is axially disposed between the flange plate 422 and the first plate 41a. The intermediate plate 45 and the first friction member 44 cooperate to clamp the flange plate 422 axially. That is, the flange plate 422 is axially disposed between the first friction member 44 and the intermediate plate 45. More specifically, the flange plate 422 is axially disposed between the sliding part 441 and the intermediate plate 45. The intermediate plate 45 is configured to rotate relative to the input rotating body 41 and the output rotating body 42. The intermediate plate 45 is configured to rotate integrally with the first friction member 44.

[0077] Figure 7 This is a front view of the vibration damping device 4 with the first plate 41a, the second friction component 46, and the first disc spring 47 removed. Figure 7 As shown, the intermediate plate 45 has a plurality of engaging recesses 451. The engaging protrusions 443 of the first friction member 44 engage with each of the engaging recesses 451. Therefore, the first friction member 44 and the intermediate plate 45 rotate integrally with each other.

[0078] The intermediate plate 45 has multiple receiving portions 452. Each receiving portion 452 overlaps with each window portion 411a, 411b and receiving hole 423 when viewed along the axial direction. Each receiving portion 452 houses a resilient member 43. That is, the resilient member 43 is housed within each window portion 411a, 411b, receiving hole 423 and receiving portion 452.

[0079] The intermediate plate 45 is annular, extending circumferentially. The intermediate plate 45 is positioned radially outward relative to each of the first through holes 412a, 412b and each of the second through holes 424. Thus, the intermediate plate 45 does not cover each of the first through holes 412a, 412b and each of the second through holes 424. That is, when viewed axially, the intermediate plate 45 does not overlap with each of the first through holes 412a, 412b and each of the second through holes 424.

[0080] <Second Friction Component>

[0081] like Figure 5 As shown, the second friction member 46 is axially disposed between the intermediate plate 45 and the first plate 41a. The second friction member 46 is annular, extending circumferentially. The second friction member 46 is configured to rotate relative to the intermediate plate 45. The second friction member is configured to slide with the intermediate plate 45. The second friction member 46 is configured to generate frictional force by rotating relative to the intermediate plate 45. The second friction member 46 is configured to rotate integrally with the input rotating body 41.

[0082] Figure 8 This is the front view of the vibration damping device 4 with the first plate 41a removed. (See image below.) Figure 8 As shown, the second friction member 46 has a plurality of claws 461. Each claw 461 engages with the first plate 41a (see reference). Figure 2 Therefore, the second friction component 46 rotates integrally with the first plate 41a.

[0083] like Figure 5 as well as Figure 8As shown, the second friction member 46 is arranged radially spaced from the outer peripheral surface of the hub 421. Specifically, the second friction member 46 is arranged radially outward relative to each of the first through holes 412a, 412b and each of the second through holes 424. Thus, the second friction member 46 does not cover each of the first through holes 412a, 412b and each of the second through holes 424. That is, the second friction member 46 does not overlap with each of the first through holes 412a, 412b and each of the second through holes 424 when viewed axially.

[0084] The second friction member 46 has an annular recess 462 extending circumferentially on its surface facing the intermediate plate 45. The annular recess 462 is opposite to the engaging protrusion 443 and the engaging recess 451. That is, the second friction member 46 does not slide with the engaging protrusion 443. In addition, the second friction member 46 does not slide with the periphery of each engaging recess 451 in the intermediate plate 45.

[0085] <First Disc Reed>

[0086] The first disc spring 47 applies force to the second friction member 46 towards the intermediate plate 45. The first disc spring 47 is axially disposed between the second friction member 46 and the first plate 41a. The first disc spring 47 is configured to rotate integrally with the second friction member 46.

[0087] The first disc spring 47 has a plurality of slits 471. Each slit 471 opens radially outward. Each claw portion 461 of the second friction member 46 engages with each slit 471. Therefore, the first disc spring 47 and the second friction member 46 rotate integrally.

[0088] The first disc spring 47 is arranged radially spaced from the outer peripheral surface of the hub 421. Specifically, the first disc spring 47 is arranged radially outward relative to each of the first through holes 412a, 412b and each of the second through holes 424. Thus, the first disc spring 47 does not cover each of the first through holes 412a, 412b and each of the second through holes 424. That is, the first disc spring 47 does not overlap with each of the first through holes 412a, 412b and each of the second through holes 424 when viewed axially.

[0089] [Torque Limiter]

[0090] like Figure 2As shown, the torque limiter 3 is configured to rotate about 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 on 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, 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 when viewed axially. The first fastening members 5 are, for example, bolts.

[0091] 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 predetermined value in the power transmission device 100.

[0092] 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).

[0093] <Flywheel>

[0094] The flywheel 31 is mounted on the crankshaft 101 by a plurality of first fastening components 5. The flywheel 31 rotates integrally with the crankshaft 101.

[0095] The flywheel 31 has a base portion 311 and a support portion 312. The support portion 312 is mounted on the base portion 311 by a plurality of bolts 102. The support portion 312 rotates integrally with the base portion 311.

[0096] The base portion 311 is a circular plate with an opening in the center. The base portion 311 is mounted on 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.

[0097] 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.

[0098] 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 and the base portion 311 are disposed axially spaced apart. Specifically, the inner periphery of the support portion 312 is disposed axially spaced apart from the base portion 311. The outer periphery of the support portion 312 is in contact with the base portion 311. The support portion 312 is mounted on the base portion 311 at its outer periphery.

[0099] 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. The second disc spring 35, described later, protrudes axially to a first side through this threaded hole 312a. That is, the threaded hole 312a is axially opposite to the second disc spring 35.

[0100] 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 thickness of the support portion 312 is greater than the thickness of the base portion 311.

[0101] <Friction Plate>

[0102] 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.

[0103] 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.

[0104] <Friction Materials>

[0105] 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.

[0106] 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.

[0107] <Pressure plate>

[0108] 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.

[0109] 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.

[0110] <Second Disc Reed>

[0111] The second disc spring 35 is axially disposed 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 by the pressure plate 34 and the support portion 312.

[0112] 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 is axially opposed to the threaded hole 312a.

[0113] <Second Fastening Component>

[0114] 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. When viewed axially, the through hole 311a is large enough to expose the entire second fastening member 6. In other words, the second fastening member 6 is entirely 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 so that it does not overlap with the second fastening member 6 when viewed axially. The second fastening member 6 is, for example, a rivet.

[0115] <Manufacturing Method>

[0116] Next, the manufacturing method of the power transmission device 100 configured as described above will be explained. First, as... Figure 9 As shown, the torque limiter 3 and the vibration damping device 4 are assembled independently. Then, the assembled torque limiter 3 and vibration damping device 4 are combined together.

[0117] 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 via the second fastening member 6 is performed through the through hole 311a formed in the base portion 311 (e.g., flattening the head of the second fastening member 6). Thus, after assembling the power transmission device 100, the power transmission device 100 is mounted on the crankshaft 101 via the first fastening member 5. The first fastening member 5 is threadedly engaged with the crankshaft 101 via the first through holes 412a, 412b and the second through hole 424.

[0118] 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.

[0119] In this case, such as Figure 10 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.

[0120] [Variation Example]

[0121] 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.

[0122] (a) In the above embodiment, the first friction member 44 is disposed between the second plate 41b and the flange plate 422, but it can also be disposed between the first plate 41a and the flange plate 422.

[0123] (b) In the above embodiment, the vibration damping device 4 has a second friction member 46, but the vibration damping device 4 may also not have a second friction member 46.

[0124] (c) In the above embodiment, the first friction member 44 is configured to rotate integrally with the intermediate plate 45, but the first friction member 44 may also rotate relative to the intermediate plate 45. In addition, the vibration damping device 4 may not have an intermediate plate 45.

Claims

1. A vibration damping device, characterized in that, have: The first rotating component has multiple windows; The second rotating component has a flange plate including a plurality of receiving holes and a cylindrical hub extending axially, and is configured to rotate relative to the first rotating component. Multiple elastic members are disposed in each of the window portions and each of the receiving holes, and elastically connect the first rotating member and the second rotating member; as well as The first friction component is arranged radially spaced from the outer peripheral surface of the hub. The flange plate includes a plurality of support surfaces, which are the radially outward-facing surfaces among the surfaces defining each of the receiving holes. The first friction component has: An annular sliding portion is disposed between the first rotating component and the flange plate and extends circumferentially; as well as Multiple protrusions, which protrude axially from the sliding portion and are disposed within each of the receiving holes, are supported by each of the supporting surfaces.

2. The vibration damping device according to claim 1, characterized in that, 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 the corresponding first through holes when viewed along the axial direction. The first friction component is arranged radially outward relative to each of the first through holes and each of the second through holes.

3. The vibration damping device according to claim 1, characterized in that, When viewed along the axial direction, each of the aforementioned support surfaces is an arc centered on the axis of rotation.

4. The vibration damping device according to claim 3, characterized in that, Each of the protrusions has an inner abutment surface that contacts each of the supporting surfaces. When viewed along the axial direction, each of the inner contact surfaces is an arc centered on the axis of rotation.

5. The vibration damping device according to claim 1, characterized in that, The flange plate includes multiple stop surfaces, which are circumferentially oriented surfaces that define each of the receiving holes. Each of the protrusions has a plurality of abutment surfaces facing each of the stop surfaces in the circumferential direction.

6. The vibration damping device according to claim 5, characterized in that, Each of the protrusions has an inner abutment surface that contacts each of the supporting surfaces. Each of the aforementioned contact surfaces is separated from the inner contact surface.

7. The vibration damping device according to claim 1, characterized in that, Each of the protrusions has a cavity inside.

8. The vibration damping device according to claim 7, characterized in that, Each of the cavities extends axially, opens at the front end of the protrusion, and is blocked at the base end of the protrusion.

9. The vibration damping device according to claim 1, characterized in that, The vibration damping device also includes an intermediate plate, which is configured to rotate relative to the first rotating component and the second rotating component. The intermediate plate has a receiving portion for accommodating each of the elastic components. The first friction component is configured to rotate integrally with the intermediate plate. The flange is positioned between the first friction component and the intermediate plate.

10. The vibration damping device according to claim 9, characterized in that, The vibration damping device also includes a second friction component, which is configured to rotate integrally with the first rotating component. The second friction component is configured to slide against the intermediate plate.

11. The vibration damping device according to claim 10, characterized in that, The intermediate plate has a locking recess. The first friction component has an engaging protrusion that engages with the engaging recess. The second friction component has an annular recess extending circumferentially on its surface facing the intermediate plate. The annular recess is opposite to the engaging protrusion and the engaging recess.

12. 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 claim 2; and Fastening components, The torque limiter has: A flywheel having a base portion and a support portion, the support portion being disposed on a first axial side at a distance from the base portion; 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 to be exposed axially through the first through hole and the second through hole.

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