Hydraulic system for work machine
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United States of America Patent
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May 12, 2020
Grant Date -
Oct 5, 2017
app pub date -
Mar 30, 2017
filing date -
Mar 30, 2016
priority date (Note) -
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Abstract
A hydraulic system for a work machine includes a hydraulic bump to output an operation fluid, a hydraulic switch valve to be switched among switching positions in accordance with a pressure of the operation fluid, a proportional valve to change the pressure of the operation fluid applied to the hydraulic switch valve, a travel hydraulic device to change a thrust power in accordance with the switching positions of the hydraulic switch valve. And, the hydraulic system includes a controller to control the proportional valve in accordance with a state of the travel hydraulic device.
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