192 clutches and power-stop control – Elements – Wear compensators
Patent
1989-05-08
1990-09-25
Bonck, Rodney H.
192 clutches and power-stop control
Elements
Wear compensators
192 7025, F16D 1375
Patent
active
049587145
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an automatic adjusting device for a twin plate clutch, the adjusting device operating automatically to compensate for wear of the friction elements of the clutch.
Automatic adjusting devices are known, for example from British Patent Specification No. 1 053 413 in which a friction-held pin is mounted in an intermediate pressure plate of the clutch and is caused to slide relative to the intermediate pressure plate should there be any movement of the intermediate pressure plate resulting from wear in the friction elements of the clutch so as to re-position the intermediate pressure plate. However, we have found that vibration can cause the friction-held pin to move even if there is no wear in the friction elements and this can result in premature partial engagement of the clutch. An alternative automatic adjusting device is known from British Patent Specification No. 1 456 149 in which a friction-held sleeve is mounted in an intermediate pressure plate of the clutch and is caused to slide relative to the intermediate pressure plate so as to re-position the pressure plates should there be any movement between the intermediate pressure plate and the main pressure plate resulting from wear in the friction elements of the clutch. Once again, we have found that vibration can cause the friction-held sleeve to move even if there is no wear in the friction elements resulting in premature partial engagement of the clutch.
It is an object of the present invention to provide an automatic adjusting device for a twin-plate clutch which does not permit undesired movement of the adjusting pin.
According to the present invention there is provided an automatic adjusting device for a twin-plate clutch comprising:
a pin mounted on an intermediate pressure plate of the clutch so as to be slidable along an axis parallel to the axis of rotation of the clutch;
first and second abutments provided adjacent to the pin, the first abutment providing a stop for determining adjustment of the pin relative to the intermediate pressure plate and the second abutment providing a stop for determining an intermediate position of the intermediate pressure plate;
a plate mounted on the pin by way of an aperture provided in the plate, which aperture is dimensioned such that the plate is tiltable relative to the pin;
a third abutment provided on the intermediate pressure plate and engageable with the tiltable plate, the third abutment defining an axis about which the plate is tiltable; and
a resilient member urging the tiltable plate in the axial direction of the clutch towards the third abutment so as to cause the plate to tilt and to engage the pin, permitting adjustment of the pin relative to the intermediate pressure plate when the pin is urged against the first abutment and inhibiting movement of the pin relative to the intermediate pressure plate when the pin is urged against the second abutment.
The first abutment may be provided on a main pressure plate of the clutch and engageable by a circlip located in a circumferential groove formed in the pin and extending radially outwardly from said groove.
Alternatively, the first abutment may be provided on a face of a driving member of the clutch and may be engageable by an end of the pin.
The second abutment may be provided on a main pressure plate of the clutch and engageable by an enlarged head portion provided at an end of the pin or by a circlip mounted on the pin.
The second abutment may alternatively be provided on a spacing ring arranged between a driving member of a clutch and a clutch cover and may be engageable by an end of the pin.
The resilient member may be a coil spring which is arranged around the pin.
Alternatively, the resilient member may be a coil spring located on that side of the pin remote from the third abutment. The coil spring may be held in place by a pin or rivet extending axially within the spring.
A further resilient member may be provided to urge the pin towards the first abutment.
Frictional damping means may be positioned around the
REFERENCES:
patent: 2354829 (1944-08-01), Reed
patent: 2385517 (1945-09-01), Hunt
patent: 3394787 (1968-07-01), Fitzgerald
patent: 3797622 (1974-03-01), Worner et al.
patent: 3871500 (1975-03-01), Linn et al.
patent: 4742901 (1988-05-01), Takeuchi et al.
patent: 4787493 (1988-11-01), Ohsono et al.
Cooke Richard D.
Higginbottom Charles
Automotive Products plc
Bonck Rodney H.
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