Hydraulic controller for working machine
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United States of America Patent
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Sep 29, 2009
Grant Date -
Jan 24, 2008
app pub date -
Sep 24, 2007
filing date -
May 15, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hydraulic controller for working machine according to the present invention, which presupposes an electronic control system where an integrated bleed-off valve common to hydraulic actuators is used for bleed-off control and the bleed-off valve is controlled by the secondary pressure of a proportional solenoid valve controlled by a controller, is constituted to compensate supply of a pressure oil for the hydraulic actuators even if the secondary pressure of the proportional solenoid valve is stopped, by providing, at the bleed-off valve, a fail-safe position with a fail-safe path which opens with an opening having smaller area than an unload opening.
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