Fluid-pressure and analogous brake systems – Releasing – Motor
Patent
1988-02-12
1990-01-16
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Releasing
Motor
188170, 192 4A, B60T 1322, F16D 6524, B60K 4126
Patent
active
048938793
ABSTRACT:
A hydraulic wheel braking system for a vehicle includes wet disc wheel brakes that are applied by a single spring-activated piston within each brake housing. Each piston is selectively and variably disengaged from the brake discs by variable hydraulic pressure acting against the piston in opposition to spring pressure to enable controlled wheel rotation. During vehicle operation, brake fluid pressure at the pistons is controlled by a foot pedal-operated brake valve. A manually-operated parking and control valve assembly can selectively disable the brake valve and relieve hydraulic pressure at the pistons to spring-apply the pistons to the discs. The assembly acts to automatically spring-apply the pistons to the discs uopn a loss of brake or transmission clutch fluid pressure.
REFERENCES:
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patent: 3132724 (1964-05-01), Ansteth
patent: 3680666 (1972-08-01), Sommer
patent: 3905651 (1975-09-01), Hornung
patent: 3927737 (1975-12-01), Prillinger et al.
patent: 3941219 (1976-03-01), Myers
patent: 3946837 (1976-03-01), Houser
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patent: 4274680 (1981-06-01), Sieving et al.
patent: 4358000 (1982-11-01), Cumming
patent: 4415067 (1983-11-01), Cory
patent: 4483422 (1984-11-01), Cory
Schematic Diagram entitled "Split Service Brake System with High-Pressure Drive Line Brake", (undated).
Albertson Mark J.
Johnson Eric
Middelhoven Paul J.
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