Hydraulic control device of construction machine

Details Hydraulic control device of construction machine Hydraulic control device of construction machine

2008-01-23

2010-10-26

Lopez, F. Daniel (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

Reexamination Certificate

active

07818968

ABSTRACT:
A hydraulic control device of construction machine is provided with a control valve lying between a hydraulic pump and a hydraulic actuator for opening and closing a meter-in control flow path, and a flow rate control valve lying between a pump discharge line on the upstream side of the above control valve and a tank. The above flow rate control valve receives a pump pressure and a load sensing pressure corresponding to a pressure on the downstream side of the meter-in control flow path as a pilot pressure, and is activated for opening and closing so as to maintain a constant differential pressure therebetween. The above flow rate control valve is maintained in a closed state by a pilot pressure switching valve when the load sensing pressure is low. The above control valve opens a bypass line when the meter-in control flow path is closed.

REFERENCES:
patent: 5081839 (1992-01-01), McWilliams
patent: 8-93705 (1996-04-01), None

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