Construction machine with hydraulic circuit
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United States of America Patent
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Jun 16, 2015
Grant Date -
May 9, 2013
app pub date -
Nov 6, 2012
filing date -
Nov 9, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
Provided is a construction machine including a first circuit with a boom cylinder, a second circuit with an arm cylinder and a third circuit with a slewing motor, first to third pumps discharging respective first to third pump fluids, a first flow combining valve having a first combining position for the third and first pump fluids and a first combination limiting position, a second flow combining valve having a second combining position for the third and second pump fluids and a first combination and a second combination limiting position, and a flow combination switching control section which switches the flow combining valves to their respective combination limiting positions during an arm attracting operation and switches the combining valves to their respective combination limiting positions during a single slewing operation or during a boom raising operation with no arm operation.
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