Fluid-pressure and analogous brake systems – With pump
Patent
1992-01-21
1993-04-20
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
With pump
303 15, 188170, 192 0094, 192 123, 192 141, 192 4R, B60T 1316, F16D 6524
Patent
active
052036162
ABSTRACT:
A spring-applied, pressure-released parking brake is controlled by an electrohydraulic control system. A solenoid operated parking brake control valve and a manually operated tow control valve control communication between the engine driven pump, the sump, the operator driven pump and the release chamber of the parking brake so that the parking brake can be released and applied during normal operation of the engine driven pump and so that the parking brake can be released by operation of the operator driven pump when the vehicle is shut down. A transport sump valve and an inlet check valve operate to prevent the parking brake from engaging while the vehicle is moving too fast, as a result of operator error, hydraulic failure or electrical failure.
REFERENCES:
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patent: 4245724 (1981-01-01), Beck
patent: 4254845 (1981-03-01), Braun
patent: 4432585 (1984-02-01), Nezuka
patent: 4749236 (1988-06-01), Graham
patent: 4856622 (1989-08-01), Sartain et al.
patent: 4923254 (1990-05-01), Vander Molen et al.
patent: 4989703 (1991-02-01), Forsyth et al.
Ballato Josie A.
Deere & Company
Oberleitner Robert J.
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