192 clutches and power-stop control – Clutches – Operators
Patent
1990-04-17
1992-02-18
Herrmann, Allan D.
192 clutches and power-stop control
Clutches
Operators
192 7027, F16D 1344
Patent
active
050885847
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical field
This invention relates to a pull type clutch cover assembly, in which an outside fulcrum point of a diaphragm spring is supported by a clutch cover, an intermediate fulcrum point is made contact with a fulcrum land of a pressure plate, an inside fulcrum point is carried by a release bearing, and a clutch is disengaged by moving the release bearing toward axial rear side opposite to the pressure plate.
2. Background art
FIG. 20 is a vertical sectional partial schematic view showing a conventionally generally known pull type clutch cover assembly. A friction facing 2 is provided on an outer periphery of a clutch disc (not shown) so that the facing 2 is pressed on a flywheel 1 by a pressure plate 3. Outer periphery and backside surfaces of the pressure plate 3 are covered by a clutch cover 4. The clutch cover 4 is secured by a bolt 7 to the flywheel at its outer periphery. An outer peripheral part of the pressure plate 3 is connected to an inside surface of the clutch cover 4 by a strap plate (not shown) extending in circumferential direction, and the pressure plate 3 is so supported that it cannot rotate relatively to the clutch cover 4 but can slide in axial direction.
A disc-like annular diaphragm spring 5 is disposed between the clutch cover 4 and the pressure plate 3. An outside fulcrum point C1 of the diaphragm spring 5 is supported by a corner 4a of the clutch cover 4, its intermediate fulcrum point C2 is made contact with a fulcrum land 3a of the pressure plate 3, and its inside fulcrum point C3 is carried by a release bearing 6.
The clutch is engaged when the facing 2 is pressed on the flywheel 1 by the pressure plate 3 which is urged by the diaphragm spring 5, and the clutch is disengaged when the release bearing 6 is moved toward axis rear side opposite to the pressure plate 3 to cause an inner peripheral part of the diaphragm spring 5 to move backward around the outside fulcrum point C1 and the pressure plate 3 to move backward by an elastic force of the strap plate.
Generally, the diaphragm spring 5 has such a characteristic that its load changes as shown by a solid line A of FIG. 3 in relation to its deflection. A deflection in early operating stage under clutch engaged condition is ordinarily set to a value of a point B. However, the load gradually increases to reach a point C when the facing 2 is worn out after a long term of operation and the deflection of the diaphragm spring 5 under clutch engaged condition decreases as the result. Then, the load gradually decreases to cause the deflection to reach a wear limit point D when the wear of the facing 2 further increases. As described above, the conventional structure has included such a trouble that the load (pressing force of the diaphragm spring 5 might increase more than required so that an excessive torque might be transmitted between the drive side flywheel 1 and the driven side clutch disc (not shown) and a necessary treading force of clutch pedal might increase.
DISCLOSURE OF THE INVENTION
In order to solve the above problem; in a pull type clutch in which an outside fulcrum point of a diaphragm spring is supported by a clutch cover, an intermediate fulcrum point is made contact with a fulcrum land of a pressure pate, an inside fulcrum point is carried by a release bearing, and a clutch is disengaged by moving the release bearing toward axial rear side opposite to the pressure plate; this invention provides a pull type clutch cover assembly, in which a disc-like annular coned disc spring is disposed between the diaphragm spring and the clutch cover or the pressure plate, in such a manner that an inner peripheral edge of the coned disc spring is moved together with the diaphragm spring toward the pressure plate side in axial direction, when the clutch is engaged, so as to urge the diaphragm spring in an axial direction opposite to the pressure plate.
According to this invention, when a deflection of the diaphragm spring decreases due to a wear of a friction facing at time of clutch engagement, the coned
REFERENCES:
patent: 3167162 (1965-01-01), Cook
patent: 4602708 (1986-07-01), Nagano
patent: 4646901 (1987-03-01), Lassiaz et al.
patent: 4648499 (1987-03-01), Despres et al.
patent: 4949829 (1990-08-01), Tojima et al.
Inaba Masakazu
Takenaka Mitsuhiko
Takeuchi Hiroshi
Herrmann Allan D.
Kabushiki Kaisha Daiken Seisakusho
Whitelaw Nicholas
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