Hydraulic circuit of winch for crane
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United States of America Patent
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-
Sep 3, 2013
Grant Date -
Aug 19, 2010
app pub date -
Feb 4, 2010
filing date -
Feb 16, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
Second-gear blocking switching valves 101 to 104 are provided in pipe lines providing communication between remote control valves 22, 24 and pilot operation portions of valve sections of second-gear spools of control valves. A switching selection means 105 switches the second-gear blocking switching valves 101 to 104. Proportional pressure reduction valves 111 to 114 change secondary pressure to be outputted in accordance with secondary pressure of the remote control valves. Secondary pressure changing switching valves 116 to 119 are provided in pipe lines providing communication between the remote control valves and pilot operation portions of valve sections of first-gear spools of the control valves. The secondary pressure changing switching valves are switched to first positions for transmitting the secondary pressure of the remote control valves to the pilot operation portions when the second-gear blocking switching valves are switched to transmission positions, and switched to second positions for transmitting the secondary pressure of the proportional pressure reduction valves to the pilot operation portions when the second-gear blocking switching valves are switched to block positions. In the present invention, it is possible to selectively use the one-pump and one-motor independent circuit type and the two-pump merging series circuit type, to improve the operation performance of operation levers, and to simplify the configuration of a hydraulic circuit.
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