Search

US-20260126084-A1 - POWER TRANSMISSION DEVICE

US20260126084A1US 20260126084 A1US20260126084 A1US 20260126084A1US-20260126084-A1

Abstract

A first friction plate is disposed between a first rotor and a second rotor in an axial direction. The first friction plate includes an outer slide portion and an inner slide portion. The outer slide portion is disposed radially outside an elastic member. The outer slide portion generates a friction force when rotated relative to the second rotor. The inner slide portion is disposed radially inside the elastic member. The inner slide portion generates a friction force when rotated relative to the first rotor. This structure stably generates a friction force.

Inventors

  • Hiroshi Uehara

Assignees

  • EXEDY CORPORATION

Dates

Publication Date
20260507
Application Date
20251002
Priority Date
20241101

Claims (20)

  1. 1 . A power transmission device comprising: a first rotor; a second rotor disposed to be rotatable relative to the first rotor; an elastic member elastically coupling the first rotor and the second rotor therethrough to each other; and a first friction plate disposed between the first rotor and the second rotor in an axial direction, wherein the first friction plate includes an outer slide portion disposed radially outside the elastic member, the outer slide portion generating a friction force when rotated relative to the second rotor, and an inner slide portion disposed radially inside the elastic member, the inner slide portion generating a friction force when rotated relative to the first rotor.
  2. 2 . The power transmission device according to claim 1 , wherein the second rotor includes a first plate disposed on a first side of the first rotor in the axial direction, and a 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 is disposed between the first plate and the first rotor in the axial direction.
  3. 3 . The power transmission device according to claim 2 , 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.
  4. 4 . The power transmission device according to claim 2 , further comprising: an urging member disposed between the first rotor and the second plate in the axial direction, the urging member urging the first rotor and the second plate to make the first rotor and the second plate separate from each other in the axial direction.
  5. 5 . The power transmission device according to claim 4 , further comprising: a friction member disposed between the first rotor and the urging member in the axial direction, the friction member configured to be rotated unitarily with the second plate.
  6. 6 . The power transmission device according to claim 1 , further comprising: a friction member disposed between the inner slide portion of the first friction plate and the first rotor.
  7. 7 . 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.
  8. 8 . The power transmission device according to claim 7 , 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.
  9. 9 . The power transmission device according to claim 1 , wherein the first rotor includes a hub extending in the axial direction, and a flange plate provided as a member different from the hub, the flange plate configured to be rotated unitarily with the hub.
  10. 10 . The power transmission device according to claim 2 , further comprising: a first restriction mechanism configured to restrict an angular range of relative rotation between the first friction plate and the first rotor.
  11. 11 . The power transmission device according to claim 10 , 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.
  12. 12 . The power transmission device according to claim 3 , further comprising: a first restriction mechanism configured to restrict an angular range of relative rotation between the first friction plate and the first rotor.
  13. 13 . The power transmission device according to claim 12 , 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.
  14. 14 . The power transmission device according to claim 4 , further comprising: a first restriction mechanism configured to restrict an angular range of relative rotation between the first friction plate and the first rotor.
  15. 15 . The power transmission device according to claim 14 , 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.
  16. 16 . The power transmission device according to claim 5 , further comprising: a first restriction mechanism configured to restrict an angular range of relative rotation between the first friction plate and the first rotor.
  17. 17 . The power transmission device according to claim 16 , 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.
  18. 18 . The power transmission device according to claim 6 , further comprising: a first restriction mechanism configured to restrict an angular range of relative rotation between the first friction plate and the first rotor.
  19. 19 . The power transmission device according to claim 18 , 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.
  20. 20 . The power transmission device according to claim 8 , wherein the first rotor includes a hub extending in the axial direction, and a flange plate provided as a member different from the hub, the flange plate configured to be rotated unitarily with the hub.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is based on and claims the priority benefit of Japanese application No. 2024-192742 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 It is an object of the present invention to provide a power transmission device that stably generates a friction force. A power transmission device according to a first aspect includes a first rotor, a second rotor, an elastic member, and a first friction plate. The second rotor is disposed to be rotatable relative to the first rotor. The elastic member elastically couples the first rotor and the second rotor therethrough to each other. The first friction plate is disposed between the first rotor and the second rotor in an axial direction. 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 outer slide portion generates a friction force when rotated relative to the second rotor. The inner slide portion is disposed radially inside the elastic member. The inner slide portion generates a friction force when rotated relative to the first rotor. According to the configuration, the first friction plate generates the friction force at the inner slide portion thereof when rotated relative to the first rotor; on the other hand, the first friction plate generates the friction force at the outer slide portion when rotated relative to the second rotor. The outer slide portion is disposed radially outside the elastic member; hence, the outer slide portion is enabled to have a large friction surface for generating the friction force, whereby it is made possible to stably generate the friction force. A power transmission device according to a second aspect relates to the power transmission device according to the first aspect 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 first rotor in the axial direction. The second plate is disposed on a second side of the first rotor in the axial direction. The second plate is configured to be rotated unitarily with the first plate. The first friction plate is disposed between the first plate and the first rotor in the axial direction. A power transmission device according to a third aspect relates to the power transmission device according to the second aspect and further includes a side plate, a pressure plate, and a second friction plate. The second friction plate is attached to the second plate. The second friction plate is interposed between and held by the side plate and the pressure plate in the axial direction. A power transmission device according to a fourth aspect relates to the power transmission device according to the second or third aspect and further includes an urging member. The urging member is disposed between the first rotor and the second plate in the axial direction. The urging member urges the first rotor and the second plate to make the first rotor and the second plate separate from each other in the axial direction. A power transmission device according to a fifth aspect relates to the power transmission device according to the fourth aspect and further includes a friction member. The friction member is disposed between the first rotor and the urging member in the axial direction. The friction member is configured to be rotated unitarily with the second plate. 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 further includes a friction member. The friction member is disposed between the inner slide portion of the first friction plate and the first rotor. A power transmission device according to a seventh aspect relates to the power transmission device according to any of the first to sixth aspects 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 an eighth aspect relates to the power transmission device according to the seventh 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 i