Hydraulic excavator drive system
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United States of America Patent
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Jan 1, 2019
Grant Date -
Apr 20, 2017
app pub date -
Feb 16, 2015
filing date -
Mar 24, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A hydraulic excavator drive system includes: a cylinder that drives a moving part that is an arm or a bucket. Hydraulic oil is supplied from a hydraulic pump to the cylinder via a control valve. A bypass line branches off from a rod-side supply/discharge line. The bypass line is blocked and opened by a restrictor. The restrictor is controlled by a controller such that, when the hydraulic oil is supplied to the cylinder through a head-side supply/discharge line, the restrictor blocks the bypass line if a pressure detected by a load detector is lower than a predetermined value, and opens the bypass line if the pressure detected by the load detector is higher than or equal to the predetermined value.
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