Hydraulic control device of construction machine
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United States of America Patent
Stats
-
Oct 26, 2010
Grant Date -
Jul 24, 2008
app pub date -
Jan 23, 2008
filing date -
Jan 24, 2007
priority date (Note) -
Expired
status (Latency Note)
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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.
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