Universal orientation electro-hydraulic actuator
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United States of America Patent
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Jan 22, 2019
Grant Date -
Jan 5, 2017
app pub date -
Jun 27, 2016
filing date -
Jun 30, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
An electro-hydraulic actuator is operable in any orientation without changing components. The electro-hydraulic actuator includes a reservoir for containing a hydraulic fluid, a bladder within the reservoir for containing a compressible gas, a pump fluidly connected to the reservoir with one or more inlet/outlet ports, and an electric motor drivingly coupled to the pump. The bladder has an inlet/outlet port configured to communicate with a gas source external to the reservoir for adjusting the amount of compressible gas within the bladder. The bladder may also be configured within the reservoir in a manner that prevents the bladder from obstructing fluid flow to the pump inlet/outlet, and that can also prevent fluid from becoming trapped by the bladder and therefore inaccessible to the pump.
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