Hydraulic circuit for construction machine
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United States of America Patent
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Jan 9, 2018
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app pub date -
Nov 19, 2013
filing date -
Dec 13, 2012
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Abstract
A hydraulic circuit for a construction machine, capable of enhancing the effect of reducing a pressure loss due to return oil from a head-side chamber of a hydraulic cylinder, with a simple structure. The circuit includes a hydraulic cylinder, a control valve, a return pipeline, and a tank direct-communication line providing direct communication between the control valve and a tank separately from the return pipeline. The control valve has a flow path leading return oil from a head-side chamber of the hydraulic cylinder to the tank direct-communication line and a flow path leading return oil from a rod-side chamber of the hydraulic cylinder to the return pipeline.
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