192 clutches and power-stop control – Clutches – Operators
Patent
1991-11-18
1993-04-27
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Operators
192109A, F16D 1371
Patent
active
052053881
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a clutch cover assembly allowing easy engagement of the clutch.
DESCRIPTION OF THE RELATED ART
Generally, during transition from a clutch disengaged state to its engaged state, a ride comfort is improved and a driver can perform clutch engaging operation more easily when a torque at initial engagement of clutch increases smoothly.
It is well known that a pair of friction facings can be coupled by a cushioning plate having an elasticity in an axial direction so that the torque at an initial engagement of the clutch can be increased smoothly. However, the cushioning plate must hold a high rigidity because the cushioning plate is also an element for transmitting a torque from the friction facings to a spline hub. Therefore, the improvement in drive feeling at the initial engagement of clutch by means of the cushioning plate is limited.
There has recently been proposed a clutch cover assembly having a construction in which an annular wave wire ring waved in the axial direction has been interposed between a projection on a back face of a pressure plate and an outer peripheral part of a diaphragm spring, and this outer peripheral part of the diaphragm spring has been seated on the wave wire ring, so that the torque at initial engagement of the clutch is increased smoothly (Japanese Examined Utility Model Published Application No. 59-2337, for example).
In this construction, however, the full load of the diaphragm spring is active to constantly urge the wave wire ring at time of clutch engagement, so that the wave wire ring may sometimes be put under a fully-compressed state, and a spring force of the wave wire ring is apt to be weakened. Accordingly, a spring constant of the wave wire ring is apt to be changed when operation of the ring is continued.
Further, in the above construction, a fulcrum point of the diaphragm spring is located at a position where an urging force of the diaphragm spring is balanced with a resilient force of the wave wire ring. Therefore, it is hard to define a distance from a friction surface between a clutch facing and a pressure plate to the fulcrum point during engaging and disengaging operations of the clutch. Further, there is a possibility that the wave wire ring is weakened to cause a shortening of the distance during a long period of operation.
It is also well known, wherein a loading fulcrum point which supports the outer peripheral part of the diaphragm spring at a time of clutch engagement and an elastic body which elastically supports the above outer peripheral part of the diaphragm spring at time of clutch disengagement are provided in coaxial relation to a projection of a pressure plate. (Japanese Examined Utility Model Published Application No. 45-15366, for example).
According to the above construction, the outer peripheral part of the diaphragm spring is seated on the loading fulcrum point of the projection, so that the durability of the elastic body can be improved and a high precision can be maintained.
In the above construction, however, the elastic body is located at a position nearer to an inner peripheral side than the loading fulcrum point. Consequently, an axial deformation of the elastic body becomes comparatively large so that a distortion over time becomes large. Therefore, an allowance for strain of the elastic body changes to cause a change in the disengaging characteristic. For this reason, it has been necessary to frequently exchange parts.
Further, there has been disclosed a clutch cover assembly in Japanese Unexamined Published Application No. 62-224729. The clutch cover assembly comprises a pressure plate, a projection extending at a backside of the pressure plate in the same circumferential direction with a clearance between them and projecting to an outer peripheral part of a diaphragm spring, a wire ring disposed at a tip end of, and in coaxial relation to the projection, and the diaphragm spring the outer peripheral part of which is seated on the wire ring, the diaphragm spring including a rib ext
REFERENCES:
patent: 3323624 (1967-06-01), Maurice
patent: 4291792 (1981-09-01), Henao
patent: 4678071 (1987-07-01), Ball et al.
patent: 4770282 (1988-09-01), Maycock et al.
patent: 5054598 (1991-10-01), Tojima
Hamada Toru
Hashimoto Yasuyuki
Takeuchi Hiroshi
Bonck Rodney H.
Kabushiki Kaisha Daikin Seisakusho
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