Hybrid construction machine
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United States of America Patent
Stats
-
Aug 19, 2014
Grant Date -
Nov 10, 2011
app pub date -
Jul 2, 2010
filing date -
Jul 10, 2009
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A hybrid construction machine includes a control valve provided in a flow passage that connects an actuator to a regenerative hydraulic motor, an opening of which is controlled by a pilot pressure led to a pilot chamber thereof; and a solenoid pilot control valve that leads a pressure on an upstream side of the control valve to the pilot chamber. In the control valve, a pressure receiving area of a main spool for receiving the pilot pressure is equal to an area obtained by subtracting a pressure receiving area of the main spool for receiving a pressure of an outflow port in a direction for moving the main spool against a biasing force of a biasing member from a pressure receiving area of the main spool for receiving a pressure of the outflow port in a direction for moving the main spool against the pilot pressure.
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