Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1985-01-25
1986-01-21
Butler, Douglas C.
Brakes
Wheel
Axially movable brake element or housing therefor
188 728, 188106F, 188370, F16D 5526, B60T 1100
Patent
active
045652651
ABSTRACT:
A disc brake has a hydraulic parking brake actuator. A parking brake piston is advanced upon actuation to close a parking brake valve, sealing hydraulic fluid in the service pressure actuating chamber. Further advancing movement of the parking brake piston generates hydraulic pressure in the actuating chamber and engages the brake. Increased pressure in the actuating chamber also increases the sealing force on the valve controlling the sealing of the pressure chamber. The parking brake mode may also be obtained while hydraulic service brake pressure exists in the actuating chamber by moving the parking brake piston sufficiently to close the parking brake valve, trapping pressurized hydraulic fluid in the actuating chamber and holding the brake in the actuated condition. This pressure may be further increased, if desirable, by further advancing movement of the parking brake piston to further increase the pressure.
REFERENCES:
patent: 3576236 (1971-04-01), Laverdant
patent: 3643763 (1972-02-01), Hay
patent: 3783981 (1974-01-01), Burgdorf
patent: 4306635 (1981-12-01), Mitchell
patent: 4471614 (1984-09-01), Hart
patent: 4487295 (1984-12-01), Mitchell
patent: 4494631 (1985-01-01), Billeter
patent: 4496033 (1985-01-01), Hall et al.
Butler Douglas C.
General Motors Corporation
McGraw D. D.
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