Fluid pressure control device for construction machine
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United States of America Patent
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Dec 4, 2018
Grant Date -
Mar 16, 2017
app pub date -
Dec 16, 2014
filing date -
Dec 16, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A fluid pressure control device for a construction machine includes a first circuit system connected to the first pump; a second circuit system connected to the second pump; a switching valve having a normal position, a straight traveling position and a merging position where the working fluid of the branch section is merged into the second neutral passage; and an open/close mechanism configured to open/close the first neutral passage. In a case where at least one of the control valves, on which merging is required, on the downstream of the second traveling control valve is switched to a position other than the neutral position, by closing the first neutral passage by the open/close mechanism and switching the switching valve to the merging position, the working fluid of the first pump is merged into the working fluid of the second pump.
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