Claims
- 1. A clutch cover assembly, comprising:a friction member connected to an output member, said friction member engaging with an input rotation member when pressed toward said output member; a clutch cover fixed to said input rotation member; a pressure plate located within said clutch cover for pressing said friction member; an urging member for urging said pressure plate toward said friction member, said urging member being a diaphragm spring, radially outward end of which urges said pressure plate; a support mechanism movable toward said friction member and for supporting said urging member, wherein said support mechanism includes a first support mechanism movable toward said friction member from said pressure plate side , and a second support mechanism movable toward said friction member from the opposite side of said pressure plate , said first support mechanism and said second support mechanism supporting radially middle portion of said diaphragm spring; and a movement regulation mechanism for moving said support mechanism toward said friction member according to wear displacement of said friction member, wherein said movement regulation mechanism includes a restriction membermechanism for permitting said first support mechanism to move toward said friction member according to wear displacement of said friction member, and an urging mechanism for urging said second support mechanism toward said friction member in order to move said second support mechanism according to movement of said first support mechanism, said movement regulation mechanism permits said support mechanism to move toward said friction member when said diaphragm spring releases its urging force against said pressure plate.
- 2. A clutch cover assembly according to claim 1, wherein said restriction mechanism permits said first support mechanism to move toward said friction member when said diaphragm spring releases its urging force against said pressure plate.
- 3. A clutch cover assembly according to claim 2, whereinsaid first support mechanism includes a support member, movable toward said friction member, for supporting said diaphragm spring from said pressure plate side , and said restriction mechanism includes an elastic member for restricting said support member from moving toward said friction member by urging said support member toward the opposite side of said friction member .
- 4. A clutch cover assembly according to claim 3, wherein urging force of said elastic member is determined such that it is at least equal to but not less than pressing force of said diaphragm spring pressing said support member toward said friction member in initial clutch release operation, and such that it becomes less than said pressing force of said diaphragm spring in the clutch release operation upon wear of said friction member, wherein urging posture of said diaphragm spring has changed to a raised one, allowing said support member to shift toward said friction member to a point at which said urging force of said elastic member becomes equal to said urging force of said diaphragm spring.
- 5. A clutch cover assembly according to claim 4, wherein said support member is composed of a ring in contact with said diaphragm spring, and a plurality of clasp extensions extending from said ring axially toward said clutch cover, passing through holes formed in said diaphragm spring; andsaid elastic member is a washer-type spring, a radially outer rim of which is supported by said clutch cover and a radially inner rim of which urges said plurality of clasp extensions in the opposite direction of said pressure plate.
- 6. A clutch cover assembly according to claim 5, wherein said second support mechanism is composed of a ring member located on one side of said diaphragm spring, said one side is opposite of said pressure plate, and a wire ring is fixed to said ring member and abutting with said diaphragm spring.
- 7. A clutch cover assembly according to claim 6, said urging mechanism is composed of a wedge mechanism extending circumferentially, and an additional urging member for urging said wedge mechanism circumferentially.
- 8. A clutch cover assembly according to claim 7, wherein said wedge mechanism is constituted by a first inclined surface formed in said ring member extending circumferentially,a second inclined surface formed in said clutch cover, abutting with said first inclined surface, and said urging member urges said first inclined surface of said ring member against said second inclined surface of said clutch cover in the circumferential direction, thereby urging said ring member toward said friction member.
- 9. A clutch cover assembly according to claim 8, wherein said ring member has a portion for receiving an end of said urging member;said clutch cover is formed with a portion for receiving an opposite end of said urging member; and said urging member is elastically compressed between the respective receiving portions of said ring member and said clutch cover.
- 10. A clutch cover assembly according to claim 2, wherein said second support mechanism is composed of a ring member located on one side of said diaphragm spring, said one side is opposite of said pressure plate, and a wire ring is fixed to said ring member and abutting with said diaphragm spring.
- 11. A clutch cover assembly according to claim 10, wherein said urging mechanism is composed of a wedge mechanism extending circumferentially and an additional urging member for urging said wedge mechanism circumferentially.
- 12. A clutch cover assembly according to claim 11, wherein said wedge mechanism is constituted by a first inclined surface formed in said ring member extending circumferentially,a second inclined surface formed in said clutch cover, abutting with said first inclined surface, and said urging member urges said first inclined surface of said ring member against said second inclined surface of said clutch cover in the circumferential direction, thereby urging said ring member toward said friction member.
- 13. A clutch cover assembly according to claim 12, wherein said ring member has a portion for receiving an end of said urging member,said clutch cover is formed with a portion for receiving an opposite end of said urging member, and said urging member is elastically compressed between the respective receiving portions of said ring member and said clutch cover.
- 14. A clutch cover assembly, comprising:a friction member connected to an output member, said friction member engaging with an input rotation member when pressed toward said output member; a clutch cover fixed to said input rotation member; a pressure plate located within said clutch cover for pressing said friction member; an urging member for urging said pressure plate toward said friction member, said urging member being a diaphragm spring, radially outward end of which urges said pressure plate; a support mechanism movable toward said friction member and for supporting said urging member, said support mechanism supporting radially middle portion of said diaphragm spring; and a movement regulation mechanism for moving said support mechanism toward said friction member according to wear displacement of said friction member, wherein said movement regulation mechanism permits said support member to move toward said friction member when said diaphragm spring releases its urging force against said pressure plate.
- 15. A clutch cover assembly according to claim 14, wherein said support mechanism includes a first support mechanism movable toward said friction member for supporting said diaphragm spring from said pressure plate side, and a second support mechanism movable toward said friction member for supporting said diaphragm spring from the opposite side of said pressure plate,said movement regulation mechanism includes a restriction mechanism for permitting said first support mechanism to move toward said friction member according to the wear displacement of said friction member, and an urging mechanism for urging said second support mechanism toward said friction member in order to move said second support mechanism according to movement of said first support mechanism.
- 16. A clutch cover assembly, comprising:a friction member connected to an output member, said friction member engaging with an input rotation member when pressed toward said output member; a clutch cover fixed to said input rotation member; a pressure plate located within said clutch cover for pressing said friction member; an urging member for urging said pressure plate toward said friction member, said urging member being a diaphragm spring, radially outward end of which urges said pressure plate; a support mechanism movable toward said friction member and for supporting said urging member, said support mechanism supporting radially middle portion of said diaphragm spring which is radially inward from a point where said diaphragm spring contacts said pressure plate; and a movement regulation mechanism for moving said support mechanism toward said friction member according to wear displacement of said friction member, wherein said movement regulation mechanism permits said support member to move toward said friction member when said diaphragm spring releases its urging force against said pressure plate.
- 17. A clutch cover assembly according to claim 14, wherein said support mechanism includes first and second support mechanisms, and said movement regulation mechanism permits said first support mechanism to move toward said friction member while said diaphragm spring urges said pressure plate.
- 18. A clutch cover assembly according to claim 17 wherein said first support mechanism includes a first support member, movable toward said friction member, for supporting said diaphragm spring, andsaid restriction mechanism includes a restriction member fixed to said first support member and is connected to said pressure plate so as to move toward said friction member with said pressure plate.
- 19. A clutch cover assembly according to claim 18, wherein said first support member is a disc member radially inward end of which supports said diaphragm spring, andsaid restriction member is fixed to outer periphery of said disc member and is provided in an axial hole in a plurality of radially outward extensions formed in outer periphery of said pressure plate.
- 20. A clutch cover assembly according to claim 19, wherein said restriction member has a rod portion axially penetrating into said axial hole of said pressure plate and a hole in said clutch cover, a portion fixed to said rod portion and keeps in contact with said pressure plate on said friction member side, and a frictional engagement portion for frictionally engaging with said hole of said clutch cover.
- 21. A clutch cover assembly according to claim 20, wherein frictional force between said frictional engagement portion and said hole of said clutch cover is larger than urging force of said diaphragm spring to said radially inward end of said disc member when said diaphragm spring releases its urging force, and smaller than urging force of said diaphragm spring against said pressure plate toward said friction member.
- 22. A clutch cover assembly according to claim 21, wherein said restriction member is composed of bolt, a head of which is said abutment portion and a body of which is said penetrating portion, and a spring pin, as said frictional engagement portion, fixed to said bolt.
- 23. A clutch cover assembly according to claim 22, wherein said first support mechanism includes a wire ring located between said radially inward end of said disc member and said diaphragm spring.
- 24. A clutch cover assembly according to claim 23, wherein said clutch cover has a disc portion covering a lateral surface of said pressure plate, andsaid second support mechanism includes a plurality of second support members located between said disc portion of said clutch cover, said second support members supporting said diaphragm spring.
- 25. A clutch cover assembly according to claim 24, wherein said urging mechanism is a wedge mechanism which urges said second member toward said friction member when centrifugal force is applied to said wedge mechanism.
- 26. A clutch cover assembly according to claim 25, wherein said wedge mechanism is constituted by a first inclined surface formed in said disc portion of said clutch cover, said first inclined surface approaching said friction member as it proceeds radially outward, andsecond inclined surfaces formed in said second support members, said second inclined surfaces abutting with said first inclined surface and inclined such that axial height of said second support members becomes shorter as they proceeds radially outward, whereby said second support members urge said diaphragm spring toward said friction member when they are urged radially outward by centrifugal force.
- 27. A clutch cover assembly according to claim 26, wherein said second support mechanism further includes a wire ring located between said second support member and said diaphragm spring.
- 28. A clutch cover assembly according to claim 27, whereinsaid clutch cover has a disc portion covering a lateral surface of said pressure plate, and said second support mechanism includes a plurality of second support members.
- 29. A clutch cover assembly according to claim 28, wherein said urging mechanism is a wedge mechanism which urges said second member toward said friction member when centrifugal force is applied to said wedge mechanism.
- 30. A clutch cover assembly according to claim 29, wherein said wedge mechanism is constituted by a first inclined surface formed in said disc portion of said clutch cover, said first inclined surface approaching said friction member as it proceeds radially outward, and second inclined surfaces formed in said second support members, said second inclined surface abutting with said first inclined surface and inclined such that axial height of said second support members becomes shorter as it proceeds radially outward, whereby said second support members urge said diaphragm spring toward said friction member when they are urged radially outward by the centrifugal force.
- 31. A clutch cover assembly according to claim 30, wherein said second support mechanism further includes a wire ring located between said second support member and said diaphragm spring.
- 32. A clutch cover assembly according to claim 1, wherein said urging mechanism comprises a plurality of wedge surfaces formed on said clutch cover, said wedge surfaces being inclined in a circumferential direction with respect to said clutch cover.
- 33. A clutch cover assembly according to claim 32, wherein said urging mechanism further comprises a ring member disposed between said wedge surfaces and said diaphragm spring, said ring member being formed with wedge surfaces engaged with said wedge surfaces of said diaphragm spring.
- 34. A clutch cover assembly according to claim 33, wherein said urging mechanism further comprises at least one coil spring disposed between said ring member and said clutch cover, said coil spring biasing said ring member to rotate relative to said clutch cover urging engagement between said wedge surfaces of said clutch cover and said wedge surfaces of said ring member.
- 35. A clutch cover assembly according to claim 34, wherein said first support mechanism has an annular portion defining a ring engaging the pressure plate side of said diaphragm spring, said first support mechanism further formed with a plurality of axially extending lever plates that extend through a generally central opening of said clutch cover, said restriction mechanism comprising a washer-type spring disposed on an outer portion of said clutch cover, said lever plates contacting said washer-type spring biasing said first support mechanism away from said pressure plate.
- 36. A clutch cover assembly according to claim 35 further comprising a spring member fixed to said pressure plate proximate a radially outer edge thereof, said spring member engaged with a radially outer edge of said diaphragm spring urging said radially outer edge of said diaphragm spring toward said pressure plate.
- 37. A clutch cover assembly according to claim 1 wherein said restriction mechanism comprises a spring pin that is force fitted into an axially extending hole formed in a radially outer portion of said clutch cover, said spring pin being coupled to said pressure plate.
- 38. A clutch cover assembly according to claim 37 wherein said restriction mechanism further comprises a bolt extending through an axially extending hole formed in said pressure plate, said bolt further extending through said spring pin.
- 39. A clutch cover assembly according to claim 38 wherein said first support mechanism further includes a support member, said bolt extending through an outer radial portion of said support member, an inner radial portion of said support member supporting a fulcrum of said diaphragm spring, said support member being movable toward said friction member for supporting said diaphragm spring, and said restriction mechanism further comprising a collar disposed about a portion of said bolt between said pressure plate and said support member thus maintaining said support member at a constant distance from said pressure plate.
- 40. A clutch cover assembly according to claim 37 wherein said restriction mechanism further comprises a bolt extending to said pressure plate for movement with said pressure plate, said bolt further extending through said spring pin, said bolt being configured to move said spring pin with respect to said clutch cover toward said pressure plate in response to wear of said friction member.
- 41. A clutch cover assembly, comprising:a friction member engageable with a flywheel when pressed toward the flywheel; a clutch cover configured for mounting to the flywheel; a pressure plate located within said clutch cover for pressing said friction member; a diaphragm spring supported in said clutch cover, said diaphragm spring engaging said pressure plate at an outward end of said diaphragm spring; a support mechanism supporting a radially middle portion of said diaphragm spring within said clutch cover, said support mechanism including a support member having an annular portion defining a ring engaging said diaphragm spring, said support member further formed with a plurality of axially extending lever plates that extend through a generally central opening of said clutch cover, axial ends of said lever plates engaged with a washer-type spring disposed on an outer surface of said clutch cover, said washer-type spring biasing said support member away from said pressure plate, and a movement regulation mechanism for regulating movement of said support mechanism toward said friction member in response to wear displacement of said friction member.
- 42. A clutch cover assembly as set forth in claim 41, wherein said support mechanism further includes a second support member movable toward said friction member from a side of said pressure plate adjacent to said clutch cover, said second support member being disposed between said clutch cover and said diaphragm spring, said support member and said second support member supporting a radially middle portion of said diaphragm spring.
- 43. A clutch cover assembly according to claim 42 further comprising an urging mechanism that includes a plurality of wedge surfaces formed on said clutch cover, said wedge surfaces being inclined in a circumferential direction with respect to said clutch cover.
- 44. A clutch cover assembly according to claim 43, wherein said urging mechanism further includes a ring member disposed between said wedge surfaces and said second support member, said ring member being formed with wedge surfaces engaged with said wedge surfaces of said diaphragm spring.
- 45. A clutch cover assembly according to claim 44, wherein said urging mechanism further comprises at least one coil spring disposed between said ring member and said clutch cover, said coil spring biasing said ring member to rotate relative to said clutch cover urging engagement between said wedge surfaces of said clutch cover and said wedge surfaces of said ring member.
- 46. A clutch cover assembly according to claim 45 further comprising a spring member fixed to said pressure plate proximate a radially outer edge thereof, said spring member engaged with a radially outer edge of said diaphragm spring urging said radially outer edge of said diaphragm spring toward said pressure plate.
Priority Claims (2)
Number |
Date |
Country |
Kind |
4-62612 U |
Sep 1992 |
JP |
|
4-346511 |
Dec 1992 |
JP |
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Parent Case Info
This is a divisional application of U.S. application Ser. No. 08/117,425 filed Sep. 7, 1993, now U.S. Pat. No. 5,431,268.
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2059016 |
Jun 1971 |
DE |
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Entry |
English translation of DE-OS 2059016. |
Divisions (1)
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08/417993 |
Apr 1995 |
US |
Child |
09/221212 |
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US |
Reissues (1)
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08/417993 |
Apr 1995 |
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09/221212 |
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