192 clutches and power-stop control – Clutches – Operators
Patent
1988-08-02
1990-03-06
Braun, Leslie A.
192 clutches and power-stop control
Clutches
Operators
192 703, 192 89B, F16D 1344, F16D 1371
Patent
active
049058118
DESCRIPTION:
BRIEF SUMMARY
INDUSTRIAL USEFUL FIELD
This invention relates to a clutch cover assembly, in which a spring member for pressing a pressure plate is disposed at an outside of a clutch cover.
BACKGROUND ART
A conventional arrangement of this type of clutch is illustrated in FIG. 3 (Published Patent Application (KOKAI) No. 57-79331).
In FIG. 3, 10 is a flywheel of an engine. A clutch disc 14 is sandwiched between the flywheel 10 and a pressure plate 12. The pressure plate 12 is covered by a clutch cover 16. A spring member 18, formed into an annular disc shape, and a release operation lever 20, transmitting a spring force of the spring member 18 go the pressure plate 12, are disposed at an outside of the clutch cover 16. The lever 20 is disposed at four places, for example, in a circumferential direction of the clutch with equal distances left therebetween and is so constructed than an inner peripheral side end of the lever 20 is pressed by a release bearing 24 concentric with an input shaft 22.
However, the conventional embodiment of FIG. 3 includes a problem that the spring member 18 is supported by an inner peripheral part of the clutch cover 16. The clutch cover 16 tends to be distorted by a reaction force of the spring member 18 to cause a decrease in a displacement of a tip end of the lever 20. The ratio of displacement of the pressure plate 2 to that of the lever 20, i.e. a release efficiency is deteriorated.
Furthermore, multiplication of the spring force of the spring member 18 is limited because a lever ratio of the lever 20 is small.
Furthermore, the axial dimension of the entire clutch becomes large because the spring member 18 and the lever 20 are disposed in series in an axial direction of the clutch.
DISCLOSURE OF THE INVENTION
An object of the invention is to provide a clutch cover assembly, in which an annular disc-like spring member is disposed at an outside of a clutch cover, characterized by that a release efficiency can be improved, a lever ratio for multiplying a spring force of the spring member can be set large and an axial dimension of the assembly can be shortened.
Other features and advantages of the invention will become apparent from the description given below, taken in connection with the accompanying drawings.
STRUCTURE OF THE INVENTION
(1) Technical measure
This invention provides a clutch cover assembly, in which an approximately annular disc-like spring member is disposed at an outside of a clutch cover covering a pressure plate and is adapted to press on the pressure plate; characterized by that the spring member is composed of a diaphragm spring exerting its spring force in a direction opposite to the pressure plate; the clutch cover supports an outer peripheral part of the diaphragm spring and forms a fulcrum for stopping the reaction spring force of the diaphragm spring; a lever for multiplying the spring force carried by the clutch cover around a rotation center is located at a position radially inner than a spring force transmitting part of the pressure plate, and is disposed in a radial direction; a radially inner side spring force action point of the lever is provided at a position radially inner than said fulcrum of the diaphragm spring; a radially outer side spring force action point of the lever is provided at a position to cause a distance between the rotation center of the lever and the outer side spring force action point to be shorter than a distance between said rotation center and the inner side spring force action point; and the lever is adapted to multiply the spring force of the diaphragm spring.
(2) Function
Because the reaction force of the diaphragm spring is carried by the outer peripheral part, the action point of reaction force is positioned at the outer peripheral part of the clutch cover. The deflection of the clutch cover is reduced and release efficiency is improved.
It becomes possible to set a layer ratio of the lever.
The lever is required only to transmit the spring force of the diaphragm spring to the pressure plate while multiplying the force.
REFERENCES:
patent: 2727612 (1955-12-01), Thelander
patent: 4332314 (1982-06-01), Flotow
Asada Masaaki
Kitano Seiichi
Takeuchi Hiroshi
Braun Leslie A.
Kabushiki Kaisha Daikin Seisakusho
Lorence Richard M.
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