US-20260126083-A1 - POWER TRANSMISSION DEVICE

US20260126083A1US 20260126083 A1US20260126083 A1US 20260126083A1US-20260126083-A1

Abstract

A power transmission device includes a first rotor, a second rotor, a support member, an elastic member, and a first friction plate. The second rotor is disposed to be rotatable relative to the first rotor. The support member is attached to the second rotor. The elastic member elastically couples the first rotor and the second rotor therethrough to each other. The first friction plate includes an outer slide portion and an inner slide portion. The outer slide portion is disposed radially outside the elastic member. The inner slide portion is disposed radially inside the elastic member. The inner slide portion is disposed between the second rotor and the support member in an axial direction. Each of the outer slide portion and the inner slide portion generates a friction force when the first friction plate is rotated relative to the second rotor.

Inventors

Hiroshi Uehara

Assignees

EXEDY CORPORATION

Dates

Publication Date: 20260507
Application Date: 20251002
Priority Date: 20241101

Claims (20)

1 . A power transmission device comprising: a first rotor; a second rotor disposed to be rotatable relative to the first rotor; a support member attached to the second rotor; an elastic member elastically coupling the first rotor and the second rotor therethrough to each other; and a first friction plate including an outer slide portion and an inner slide portion, the outer slide portion disposed radially outside the elastic member, the inner slide portion disposed radially inside the elastic member, the inner slide portion disposed between the second rotor and the support member in an axial direction, wherein each of the outer slide portion and the inner slide portion is configured to generate a friction force when the first friction plate is rotated relative to the second rotor.
2 . The power transmission device according to claim 1 , further comprising: a first restriction mechanism configured to restrict an angular range of relative rotation between the first friction plate and the first rotor.
3 . The power transmission device according to claim 2 , wherein the first rotor includes a first window portion extending in a circumferential direction, the second rotor includes a second window portion extending in the circumferential direction, the elastic member is disposed in the first window portion and the second window portion, and the first restriction mechanism is disposed radially outside an inner peripheral edge of the first window portion.
4 . The power transmission device according to claim 1 , further comprising: a friction member disposed between the second rotor and the support member, the friction member contacted with the inner slide portion; and an urging member urging the friction member toward the inner slide portion.
5 . The power transmission device according to claim 4 , wherein the friction member is disposed between the first friction plate and the support member in the axial direction, and the urging member is disposed between the support member and the friction member in the axial direction.
6 . The power transmission device according to claim 1 , wherein the second rotor includes a first plate and a second plate, the first plate disposed on a first side of the first rotor in the axial direction, the second plate disposed on a second side of the first rotor in the axial direction, the second plate configured to be rotated unitarily with the first plate, and the first friction plate and the support member are disposed between the first plate and the first rotor in the axial direction.
7 . The power transmission device according to claim 6 , further comprising: a side plate; a pressure plate; and a second friction plate attached to the second plate, the second friction plate interposed between and held by the side plate and the pressure plate in the axial direction.
8 . The power transmission device according to claim 6 , further comprising: a friction member disposed between the first rotor and the second plate in the axial direction, the friction member configured to be rotated unitarily with the second plate, the friction member contacted with the first rotor.
9 . The power transmission device according to claim 8 , further comprising: an urging member urging the friction member toward the first rotor.
10 . The power transmission device according to claim 2 , further comprising: a friction member disposed between the second rotor and the support member, the friction member contacted with the inner slide portion; and an urging member urging the friction member toward the inner slide portion.
11 . The power transmission device according to claim 10 , wherein the friction member is disposed between the first friction plate and the support member in the axial direction, and the urging member is disposed between the support member and the friction member in the axial direction.
12 . The power transmission device according to claim 3 , further comprising: a friction member disposed between the second rotor and the support member, the friction member contacted with the inner slide portion; and an urging member urging the friction member toward the inner slide portion.
13 . The power transmission device according to claim 12 , wherein the friction member is disposed between the first friction plate and the support member in the axial direction, and the urging member is disposed between the support member and the friction member in the axial direction.
14 . The power transmission device according to claim 2 , wherein the second rotor includes a first plate and a second plate, the first plate disposed on a first side of the first rotor in the axial direction, the second plate disposed on a second side of the first rotor in the axial direction, the second plate configured to be rotated unitarily with the first plate, and the first friction plate and the support member are disposed between the first plate and the first rotor in the axial direction.
15 . The power transmission device according to claim 3 , wherein the second rotor includes a first plate and a second plate, the first plate disposed on a first side of the first rotor in the axial direction, the second plate disposed on a second side of the first rotor in the axial direction, the second plate configured to be rotated unitarily with the first plate, and the first friction plate and the support member are disposed between the first plate and the first rotor in the axial direction.
16 . The power transmission device according to claim 4 , wherein the second rotor includes a first plate and a second plate, the first plate disposed on a first side of the first rotor in the axial direction, the second plate disposed on a second side of the first rotor in the axial direction, the second plate configured to be rotated unitarily with the first plate, and the first friction plate and the support member are disposed between the first plate and the first rotor in the axial direction.
17 . The power transmission device according to claim 5 , wherein the second rotor includes a first plate and a second plate, the first plate disposed on a first side of the first rotor in the axial direction, the second plate disposed on a second side of the first rotor in the axial direction, the second plate configured to be rotated unitarily with the first plate, and the first friction plate and the support member are disposed between the first plate and the first rotor in the axial direction.
18 . The power transmission device according to claim 14 , further comprising: a side plate; a pressure plate; and a second friction plate attached to the second plate, the second friction plate interposed between and held by the side plate and the pressure plate in the axial direction.
19 . The power transmission device according to claim 18 , further comprising: a friction member disposed between the first rotor and the second plate in the axial direction, the friction member configured to be rotated unitarily with the second plate, the friction member contacted with the first rotor.
20 . The power transmission device according to claim 19 , further comprising: an urging member urging the friction member toward the first rotor.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is based on and claims the priority benefit of Japanese application No. 2024-192743 filed on Nov. 1, 2024, the contents of which are incorporated herein by reference. TECHNICAL FIELD The present invention relates to a power transmission device. BACKGROUND A damper device, exemplified as a power transmission device, is provided for absorbing vibrations of a prime mover such as an internal combustion engine. Japan Laid-open Patent Application Publication No. 2019-203580 describes a power transmission device that absorbs vibrations by torsion springs and inhibits an occurrence of resonance by friction forces generated when friction members are slid against a friction plate and so forth. SUMMARY OF THE INVENTION To make stable a friction coefficient when sliding between the friction plate and the counterpart component thereof occurs, the following process is required before the power transmission device is used: the friction plate and the counterpart component thereof are rotated relative to each other so as to be slid against each other. It is an object of the present invention to provide a power transmission device enabled to efficiently perform a process for making stable a friction coefficient in sliding between a friction plate and the counterpart component thereof. A power transmission device according to a first aspect includes a first rotor, a second rotor, a support member, an elastic member, and a first friction plate. The second rotor is disposed to be rotatable relative to the first rotor. The support member is attached to the second rotor. The elastic member elastically couples the first rotor and the second rotor therethrough to each other. The first friction plate includes an outer slide portion and an inner slide portion. The outer slide portion is disposed radially outside the elastic member. The inner slide portion is disposed radially inside the elastic member. The inner slide portion is disposed between the second rotor and the support member in an axial direction. Each of the outer slide portion and the inner slide portion generates a friction force when the first friction plate is rotated relative to the second rotor. According to the configuration, the first friction plate is supported by the second rotor and the support member; hence, the first friction plate, the second rotor, and the support member can be integrated as a subassembly. Further, when rotated relative to the second rotor, the first friction plate generates a friction force not only at the outer slide portion thereof but also at the inner slide portion thereof. Because of this, while the first friction plate, the second rotor, and the support member are assembled as the subassembly, friction forces can be generated by rotating the first friction plate. Consequently, it is possible to efficiently perform a process for making stable a friction coefficient when sliding between the first friction plate and a counterpart component thereof occurs. A power transmission device according to a second aspect relates to the power transmission device according to the first aspect and further includes a first restriction mechanism. The first restriction mechanism is configured to restrict an angular range of relative rotation between the first friction plate and the first rotor. A power transmission device according to a third aspect relates to the power transmission device according to the second aspect and is configured as follows. The first rotor includes a first window portion extending in a circumferential direction. The second rotor includes 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 restriction mechanism is disposed radially outside an inner peripheral edge of the first window portion. A power transmission device according to a fourth aspect relates to the power transmission device according to any of the first to third aspects and further includes a friction member and an urging member. The friction member is disposed between the second rotor and the support member. The friction member is contacted with the inner slide portion. The urging member urges the friction member toward the inner slide portion. A power transmission device according to a fifth aspect relates to the power transmission device according to the fourth aspect and is configured as follows. The friction member is disposed between the first friction plate and the support member in the axial direction. The urging member is disposed between the support member and the friction member in the axial direction. A power transmission device according to a sixth aspect relates to the power transmission device according to any of the first to fifth aspects and is configured as follows. The second rotor includes a first plate and a second plate. The first plate is disposed on a first side of the f