Fluid-pressure and analogous brake systems – Multiple systems – Fluid pressure and electric
Patent
1981-03-17
1983-08-23
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple systems
Fluid pressure and electric
188 16, 192 4R, 303 6A, 303 15, 303 71, B60T 1322
Patent
active
044000391
ABSTRACT:
A brake system for a vehicle having a pair of brakes each being spring-applied and hydraulically released. A two-position brake valve is disposed between a source of fluid and the brakes. At normal position, the brake valve allows to connect the brakes to a tank thereby applying the brakes while at an offset position fluid is introduced into the brakes so as to release them.
The brake valve is operated either by an electric actuator such as stepping cylinder or introducing fluid into a pilot port through a solenoid-operated valve. The electric actuator is operated in accordance with a signal from a potentiometer which in turn is operated by the movement of a brake pedal. The solenoid-operated valve is actuated by a signal from a switch which is adapted to be switched on by a brake lever for parking and emergency braking.
REFERENCES:
patent: 3463276 (1969-08-01), Brooks, Jr.
patent: 3488096 (1970-01-01), Hoopes
patent: 3507542 (1970-04-01), Cannella
patent: 3834769 (1974-09-01), Just
patent: 3951464 (1976-04-01), Donahue et al.
patent: 4336869 (1982-06-01), Tsutsumi
patent: 4339154 (1982-07-01), Duttarer et al.
Butler Douglas C.
Kabushiki Kaisha Komatsu Seisakusho
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