CN-121993547-A - Power transmission device

Abstract

The present application relates to a power transmission device. The power transmission device stably generates friction force. The first friction plate is disposed between the first rotating body and the second rotating body in the axial direction. The first friction plate has an outer sliding portion and an inner sliding portion. The outer sliding portion is disposed radially outward of the elastic member. The outer sliding portion generates friction force when rotating relative to the second rotating body. The inner sliding portion is disposed radially inward of the elastic member. The inner sliding portion generates friction force when rotating relative to the first rotating body.

Inventors

• UEHARA HIROSHI

Assignees

• 爱思帝股份有限公司

Dates

Publication Date

20260508

Application Date

20251027

Priority Date

20241101

Claims (9)

1. 1. A power transmission device is provided with: A first rotating body; a second rotating body configured to be rotatable relative to the first rotating body; An elastic member elastically connecting the first rotating body and the second rotating body, and A first friction plate disposed between the first rotating body and the second rotating body in an axial direction, The first friction plate has: An outer sliding part arranged radially outward of the elastic member and generating friction force when rotating relative to the second rotating body, and And an inner sliding part which is arranged on the radial inner side relative to the elastic part and generates friction force when the inner sliding part rotates relative to the first rotating body.
2. 2. The power transmission device according to claim 1, wherein, The second rotating body has: a first plate disposed on a first side in an axial direction with respect to the first rotating body, and A second plate disposed on a second side in the axial direction with respect to the first rotating body and configured to rotate integrally with the first plate, The first friction plate is disposed between the first plate and the first rotating body in an axial direction.
3. 3. The power transmission device according to claim 2, wherein the power transmission device further comprises: a side plate; Platen, and And a second friction plate mounted to the second plate and held by the side plate and the pressing plate in an axial direction.
4. 4. The power transmission device according to claim 2, wherein, The power transmission device further includes a biasing member disposed between the first rotating body and the second plate in the axial direction, the biasing member biasing the first rotating body and the second plate apart from each other in the axial direction.
5. 5. The power transmission device according to claim 4, wherein, The power transmission device further includes a friction member disposed between the first rotating body and the urging member in the axial direction, and configured to rotate integrally with the second plate.
6. 6. The power transmission device according to claim 1, wherein, The power transmission device further includes a friction member disposed between the first rotor and the inner sliding portion of the first friction plate.
7. 7. The power transmission device according to claim 1, wherein, The power transmission device further includes a first restriction mechanism configured to restrict a range of relative rotation angles of the first friction plate and the first rotating body.
8. 8. The power transmission device according to claim 7, wherein, The first rotating body has a first window portion extending in a circumferential direction, The second rotating body has a second window portion extending in the circumferential direction, The elastic member is disposed in the first window portion and the second window portion, The first restraint mechanism is disposed radially outward of an inner peripheral edge of the first window portion.
9. 9. The power transmission device according to claim 1, wherein, The first rotating body has: A hub extending in an axial direction, and The flange plate is a separate member from the hub and is configured to rotate integrally with the hub.

Description

Power transmission device Technical Field The present invention relates to a power transmission device. Background A vibration damping device as an example of the power transmission device is provided for absorbing vibration of a prime mover such as an internal combustion engine. The power transmission device of patent document 1 absorbs vibration by a torsion spring, and suppresses occurrence of resonance by friction force generated by sliding of a friction plate and a wiper member or the like. Patent document 1 Japanese patent application laid-open No. 2019-203580 Disclosure of Invention The present invention provides a power transmission device capable of stably generating friction force. The power transmission device according to the first aspect includes a first rotating body, a second rotating body, an elastic member, and a first friction plate. The second rotating body is configured to be rotatable relative to the first rotating body. The elastic member elastically couples the first rotating body and the second rotating body. The first friction plate is disposed between the first rotating body and the second rotating body in the axial direction. The first friction plate has an outer sliding portion and an inner sliding portion. The outer sliding portion is disposed radially outward of the elastic member. The outer sliding portion generates friction force when rotating relative to the second rotating body. The inner sliding portion is disposed radially inward of the elastic member. The inner sliding portion generates friction force when rotating relative to the first rotating body. According to this configuration, friction is generated by the inner sliding portion when the first friction plate and the first rotating body rotate relative to each other, and friction is generated by the outer sliding portion when the first friction plate and the second rotating body rotate relative to each other. Since the outer sliding portion is disposed radially outward of the elastic member, a friction surface for generating the friction force can be increased, and the friction force can be stably generated. A power transmission device according to a second aspect is configured as described below in the power transmission device according to the first aspect. The second rotating body is provided with a first plate and a second plate. The first plate is disposed on a first side in the axial direction with respect to the first rotating body. The second plate is disposed on a second side in the axial direction with respect to the first rotating body. The second plate is configured to rotate integrally with the first plate. The first friction plate is disposed between the first plate and the first rotating body in the axial direction. A power transmission device according to a third aspect of the present invention is the power transmission device according to the second aspect of the present invention, further comprising a side plate, a pressure plate, and a second friction plate. The second friction plate is mounted to the second plate. The second friction plate is sandwiched by the side plate and the pressure plate in the axial direction. A power transmission device according to a fourth aspect further includes a biasing member in the power transmission device according to the second or third aspect. The urging member is disposed between the first rotating body and the second plate in the axial direction. The urging member urges the first rotating body and the second plate to be separated from each other in the axial direction. A power transmission device according to a fifth aspect further includes a friction member in the power transmission device according to the fourth aspect. The friction member is disposed between the first rotating body and the urging member in the axial direction. The friction member is configured to rotate integrally with the second plate. A power transmission device according to a sixth aspect further includes a friction member in the power transmission device according to any one of the first to fifth aspects. The friction member is disposed between the inner sliding portion of the first friction plate and the first rotating body. A power transmission device according to a seventh aspect further includes a first restraint mechanism in the power transmission device according to any one of the first to sixth aspects. The first constraining mechanism is configured to constrain a range of relative rotation angles of the first friction plate and the first rotating body. A power transmission device according to an eighth aspect is the power transmission device according to the seventh aspect, configured as follows. The first rotating body has a first window portion extending in a circumferential direction. The second rotating body has a second window portion extending in the circumferential direction. The elastic member is disposed in the first window portion and the second window portion. The fir