Fluid pressure pump motor
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United States of America Patent
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May 12, 2015
Grant Date -
Feb 12, 2015
app pub date -
Mar 19, 2013
filing date -
Mar 26, 2012
priority date (Note) -
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Abstract
A fluid pressure pump motor includes a supply/discharge passage where both a hydraulic fluid pumped in to a fluid pressure pump and a hydraulic fluid discharged from the fluid pressure motor flow, and a variable valve provided in the supply/discharge passage to control the fluid path area of the supply/discharge passage. The variable valve reduces the fluid path area of the supply/discharge passage for simultaneously actuating the fluid pressure pump and the fluid pressure motor to be smaller than the fluid path area for actuating only one of the fluid pressure pump and the fluid pressure motor.
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