Hydraulic circuit with variable relief valves

Details Hydraulic circuit with variable relief valves Hydraulic circuit with variable relief valves

1989-03-28

1992-01-21

Look, Edward K.

Power plants

Pressure fluid source and motor

Servo-motor having externally operated control valve sets...

60468, 60494, 37103, F16D 3102, E02F 502

Patent

active

050818384

ABSTRACT:
A hydraulic circuit for a hydraulic shovel includes a variable displacement hydraulic pump; selector valves communicated with the variable displacement hydraulic pump; actuators communicated with the selector valves; variable relief valves provided in a discharge oil passage of the variable displacement hydraulic pump and also provided in input oil passages of some of the actuators; a pilot hydraulic pump communicated with the variable relief valves through pilot oil passages; a solenoid valve provided in the pilot oil passage for changing set pressures of the variable relief valves; a regulator for controlling a discharge quantity of the variable displacement hydraulic pump; and a pilot oil passage for communicating the solenoid valve with the regulator.

REFERENCES:
patent: 4365429 (1982-12-01), Ecker et al.
patent: 4481770 (1984-11-01), Lohbauer et al.
patent: 4628690 (1986-12-01), Arai et al.

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