192 clutches and power-stop control – Clutches – Operators
Patent
1988-08-02
1990-03-06
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Operators
192 703, 192 99A, F16D 1349, F16D 1371
Patent
active
049058096
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
(1) 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 ouside of a clutch cover.
(2) Background Art
As for this type of clutch, a conventional embodiment as illustrated by FIG. 3 is known (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, mounted on flywheel 10. A spring member 18, formed into an annular disc shape, and release operation lever 20 for transmitting a spring force of the spring member 18 to the pressure plate 12 are disposed at an outside of the clutch cover 16. Levers 20 are disposed at four places, for example, with equal distances left therebetween in a circumferential direction of clutch, and so constructed that an inner peripheral side end of the lever 20 is pressed by a release bearing 24 concentric with an input shaft 22.
However, in the conventional embodiment of FIG. 3 the spring force of the spring member 18 can not be multiplied because a lever ratio of the lever 20 is small.
Further, the axial dimension of the entire clutch becomes larger 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 this 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 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 the spring member applies a spring force to the pressure plate; characterized by that the spring member is composed of a diaphragm spring exerting a spring force toward the pressure plate; the clutch cover supports the diaphragm spring and forms a fulcrum for stopping reaction spring force of the diaphragm spring; a lever for multiplying the spring force is carried by the clutch cover around a rotation center located at a position radially outer of 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 outer of said fulcrum of the diaphragm spring; a radially outer side spring force action point of the lever, which compressively contacts with said spring force transmitting part, 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 multiplies the spring force of the diaphragm spring.
(2) Function
The only requirement of the lever is to transmit the spring force of the diaphragm spring to the pressure plate while multiplying the force. Thus, it is possible to set the lever ratio large and to shorten the axial dimension of the clutch.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a vertical partial sectional view of a clutch of a first embodiment according to the invention.
FIG. 2 is a vertical partial sectional view of a second embodiment.
FIG. 3 is a vertical sectional view of a conventional spring and lever arrangement.
BEST MODE FOR CARRYING OUT THE INVENTION
(1) First embodiment
In FIG. 1 which is a vertical partial sectional view of a clutch for large automobile according to the present invention, components attached with the same symbols as FIG. 3 represent the same or corresponding components.
In FIG.
REFERENCES:
patent: 2727612 (1955-12-01), Thelander
patent: 2751055 (1956-06-01), Dodge et al.
patent: 4332314 (1982-06-01), Flotow
patent: 4601377 (1986-07-01), Flotow et al.
patent: 4720002 (1988-01-01), Kitano et al.
Bonck Rodney H.
Kabushiki Kaisha Daikin Seisakusho
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