Arrangement for controlling a hydraulically operated friction disc clutch with diaphragm spring
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United States of America Patent
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Oct 29, 1991
Grant Date -
N/A
app pub date -
Oct 19, 1990
filing date -
Apr 22, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to an arrangement for automatic control of a hydraulically operated friction disc clutch with diaphragm spring. The hydraulic operating unit comprises a hydraulic cylinder which, by acting on the diaphragm spring, disengages the friction disc clutch. In order to obtain a hydraulic operating unit in which the regulating pressure is proportional to the disengagement degree of the clutch, the hydraulic cylinder comprises a proportionality-forming spring which acts against the hydraulic cylinder piston during the final part of the disengagement stroke of the piston. In a system with master cylinder and slave cylinder, where the slave cylinder acts on the diaphragm spring for disengagement of the friction disc clutch, the master cylinder is also provided with a pressure supply, compensating for wear of the discs, via a hydraulic channel which is closed off at a predetermined regulating pressure level. The invention permits a simplified system solution for an automated diaphragm spring clutch in a vehicle, where the clutch does not require any positional sensors, but the disengagement degree is given by the hydraulic regulating device.
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