Construction machine
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United States of America Patent
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-
Nov 28, 2017
Grant Date -
Dec 10, 2015
app pub date -
May 21, 2015
filing date -
Jun 9, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A construction machine is provided which is capable of warming up without an additional hydraulic device. A hydraulic excavator includes a cooling oil line connected to an arm control valve for leading hydraulic oil discharged from the arm control valve to a tank through an oil cooler when the arm control valve is shifted to an extension position, and a non-cooling oil line connected to the arm control valve for leading hydraulic fluid discharged from the arm control valve to the tank running away from the oil cooler when the arm control valve is shifted to a neutral position. The arm control valve includes a guide passage provided at the neutral position for leading hydraulic fluid discharged from a hydraulic pump to the non-cooling oil line.
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