Clutch

Details Clutch Clutch

1988-02-17

1989-08-15

Bonck, Rodney H.

192 clutches and power-stop control

Clutches

Axially engaging

192 98, 192 99A, F16D 1338, F16D 1350, F16D 2314

Patent

active

048566349

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. Technical Field
This invention relates to a pull-type clutch which is released by pulling a release bearing toward a transmission side by means of a releasing lever connected to a clutch pedal.
2. Background Art
In such a conventional clutch, as shown by FIG. 4, a slantly disposed coil spring 100 is employed as a load generating member for transmitting a spring force to a retainer to apply a pressing force on a clutch disc 108 from the retainer 102 through a lever 104 to a pressure plate 106 (Japanese Examined Pat. publication No. 46-15046 based on U.S. patent application Ser. No. 549,009, now U.S. Pat. No. 3,394,788).
However, such conventional clutch has a problem in that the spring force of the coil spring 100 causes the pedal depressing force to increase with an increase in a stroke of the clutch pedal. This to an increase in the pedal depressing force at the time of releasing of the clutch.
A further problem is that, at the time of high-speed rotation, centrifugal force acting on the coil spring 100 compresses the coil spring 100 to reduce the spring force applied on the pressure plate 106.
The applicants of this application have developed a new clutch which overcomes such problems in the such pull-type clutch, and have filed patent application on such of new clutch (U.S. patent application Ser. No. 900,655, now U.S. Pat. No. 4,720,002, dated Jan. 19, 1988, based on Japanese patent application No. 60-194158).
In applicants prior '655 application, as shown in FIG. 5, a diaphragm spring 110 is used. Such diaphragm spring 110 is held on a clutch cover 116 by means of wire rings 112 and a stud pin 114. A retainer 111 is spine fitted on a sleeve 113 and the clutch cover 116 and the retainer 111 are assembled with studs 117 to rotate as one piece.
However, there is a problem in the clutch of such '655 U.S. application in that the machining cost are high, because it is necessary to work a milling machining on the studs 117 of the clutch cover 116.


DISCLOSURE OF THE INVENTION

An object of the invention is to provide a clutch, which can reduce the costs of machining in a so-called pull-type clutch.


COMPOSITION OF THE INVENTION

(1) Technical measure
In a clutch carrying out a releasing operation so as to pull a release bearing away from a flywheel by means of a releasing lever connected to a clutch pedal; a clutch disc is spline fitted onto an input shaft of a transmission side, a sleeve part of a releasing retainer is provided on an outer periphery of the input shaft, a release bearing is fastened to a transmission side end of such sleeve, the load transmission part of the releasing retainer is formed into one piece continuously with the sleeve part with the releasing retainer at the flywheel side end of the sleeve part; a clutch cover is connected to the flywheel and covers the pressure plate for pressing the clutch disc into engagement with the flywheel; a disc-formed spring member is disposed between the clutch cover and the retainer part; a lever for transmitting spring force from the spring member to the pressure plate is disposed between the retainer and the pressure plate; a spline is provided on the releasing retainer and is splined to the clutch cover for permitting axially sliding of the releasing retainer while preventing rotation of the releasing retainer.
(2) Function
Because the sleeve part and the retainer part are integrally formed into one piece the number of parts are reduced, and machining costs are reduced.
The releasing retainer can slide axially and rotates integrally with the clutch cover because of the fit of the releasing retainer and the clutch cover by the spline part.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a vertical sectional view of a clutch according to the present invention.
FIG. 2 is an end view of the clutch of FIG. 1 in the direction of arrow II FIG. 1.
FIG. 2a is a perspective view of the lever.
FIG. 3 is a graph showing a relation between the spring force and the distortion of the diaphragm spring in the clutch of the invention.
FIG. 4 is a ver

REFERENCES:
patent: 1734767 (1929-11-01), Gamble
patent: 1797515 (1931-03-01), Schoenrock
patent: 2040034 (1936-05-01), Tatter
patent: 3394788 (1968-07-01), Sink
patent: 4720002 (1988-01-01), Kitano et al.
patent: 4754860 (1988-07-01), Fukutake et al.

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