Auxiliary coupler pressure relief hydraulic system with pump dri

Details Auxiliary coupler pressure relief hydraulic system with pump dri Auxiliary coupler pressure relief hydraulic system with pump dri

1988-07-26

1989-11-21

Garrett, Robert E.

Power plants

Pressure fluid source and motor

Condition responsive control of or by input to input pump...

60433, 60911, 91464, 180 534, 123179A, F15B 13043, F15B 2108, F04B 4902, F04B 4906

Patent

active

048813710

ABSTRACT:
An auxiliary coupler pressure relief hydraulic system for off-road vehicles including a battery, an engine, an engine ignition system, a reservoir of hydraulic fluid, and a pump for providing hydraulic fluid under pressure. Quick couplers couple hydraulic fluid to an attachment mounted to the vehicle. An electro-hydraulic spool valve is connected to a source of pilot pressure and controls the flow of hydraulic fluid to the quick couplers in response to valve actuating signals. Forward and reverse auxiliary control switches are coupled to the spool valve and provide valve actuating signals resulting in fluid flow to the quick couplers in forward and reverse directions. Also included is an ignition switch having RUN, OFF and RELIEF positions. When switched from its RUN position to its RELIEF position, the ignition switch provides pressure relief valve actuating signals which stroke the spool valve and bleed pressure trapped between the valve and the quick couplers while the engine RPM is decreasing and pilot pressure is still available.

REFERENCES:
patent: 3369360 (1968-02-01), de Biasi
patent: 3562542 (1971-02-01), Redmond
patent: 3612202 (1971-10-01), Moon
patent: 3808926 (1974-06-01), Wohlwend
patent: 3864913 (1975-02-01), Herrmann
patent: 4141382 (1979-02-01), Miller et al.
patent: 4314502 (1982-02-01), Brinkel et al.

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