192 clutches and power-stop control – Clutches – Operators
Patent
1992-04-24
1993-11-30
Lorence, Richard M.
192 clutches and power-stop control
Clutches
Operators
192 7027, F16D 1371
Patent
active
052657094
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a pull-type clutch cover assembly equipped with a coned spring for preventing a load of diaphragm spring from increasing more than necessary in the midway of clutch movement.
2. Background Art
FIG. 6 is a schematic vertical sectional partial view showing a well known pull-type clutch cover assembly. A friction facing 2 is secured to an outer periphery of a clutch disc (not shown), and the friction facing 2 is designed to be pressed onto a flywheel 1 by means of a pressure plate 3. An outer periphery and backside face of the pressure plate 3 is covered by a clutch cover 4.
The clutch cover 4 is secured at its outer peripheral part to the flywheel 1 by screws 7. The pressure plate 3 is coupled at its outer peripheral part to an inside face of the clutch cover 4 by a strap plate (not shown) extending in circumferential direction, so that the pressure plate 3 is carried relative to the clutch cover 4 not rotatably but freely movably in axial direction.
A disc-like annular diaphragm spring 5 is disposed between the clutch cover 4 and the pressure plate 3. The diaphragm spring 5 is supported at its outside fulcrum point C1, by a corner 4a of the clutch cover 4, brought into contact, at its intermediate fulcrum point C2, with a fulcrum land 3a of the pressure plate 3 and supported, at its inside fulcrum point C3, by a release bearing 6. When the facing 2 is pressed onto the flywheel 1 by the pressure plate 3, in turn pushed by the diaphragm spring 5, the clutch is engaged.
When the release bearing 6 is moved axially away from pressure plate 3, an inner peripheral part of the diaphragm spring 5 is moved around the outside fulcrum point C1 and the pressure plate 3 is moved away from facing 2 by an elastic force of the strap plate, so that the clutch is disengaged.
The diaphragm spring 5, generally, has such a characteristic that its load changes relative to its deflection as diagrammed by a solid line A of FIG. 3. Ordinarily, a deflection in clutch engaged condition, at initial stage of use, is set to a value of point B. However, when the facing 2 is worn after a long period of use and, as the result the deflection of the diaphragm spring 5, in clutch engaged condition, is decreased, the load increases gradually to cause the deflection to reach a point C. When the facing 2 is further worn, the load decreases gradually to cause the deflection to reach a wear limit point D. As described above, there have been possibilities that the load (pressing force) of the diaphragm spring 5 would increase more than necessary in the midway of use of clutch especially in the vicinity of the point C, an excessive torque would be transmitted from the drive-side flywheel 1 to the driven-side clutch disc (not shown), and the required force to be applied to the clutch pedal would be increased.
DISCLOSURE OF THE INVENTION
An object of the invention is to prevent a load of diaphragm spring, in a pull-type clutch, from increasing, more than necessary, in the midway of clutch, operation and to simplify assembling work of a coned disc spring installed for that purpose.
In a pull-type clutch, wherein a radial outside fulcrum point of a diaphragm spring is supported by an inner face side of a clutch cover, an intermediate fulcrum point is brought into contact with a fulcrum land of a pressure plate, an inside fulcrum point is carried by a release bearing, and the release bearing is moved axially away from the pressure plate so as to disengage a clutch; there is provided a pull-type clutch cover assembly, in which a holder, having a diaphragm spring support supporting the outside fulcrum point of the diaphragm spring and a coned spring support supporting an outer peripheral edge of a disc-like annular coned spring, is installed on an inner face of the clutch cover, the outside fulcrum point of the diaphragm spring is supported by the diaphragm spring support of the holder, the coned spring is so installed that its outer peripheral edge is supported by the coned spring support of the
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Takeuchi Hiroshi
Uehara Hiroshi
Kabushiki Kaisha Daikin Seisakusho
Lorence Richard M.
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