Hydraulic circuit for construction machine
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United States of America Patent
Stats
-
Dec 22, 2009
Grant Date -
Dec 6, 2007
app pub date -
Sep 21, 2005
filing date -
Sep 29, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic circuit including a first throttle disposed upstream of pressure-reducing valves of a remote-control valve, which operates a control valve of hydraulic pilot type, so as to reduce primary pressures supplied from a pilot pump to the pressure-reducing valves. Bleed-off lines connect pilot lines to tanks. Second throttles are disposed on the bleed-off lines, respectively, so as to moderate rises in the pilot pressures supplied to pilot ports of the control valve. The hydraulic circuit prevents detrimental effects such as deterioration of operability while ensuring shock absorption during quick operation.
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