Hydraulic drive system
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United States of America Patent
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Dec 28, 2010
Grant Date -
Aug 6, 2009
app pub date -
Apr 13, 2009
filing date -
Dec 1, 2004
priority date (Note) -
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Abstract
A hydraulic drive system for an actuator uses a pair of pressure compensated hydraulic machines to control flow to and from the drive chambers of the actuator by varying the controlled pressure of one of the machines. The machines are mechanically coupled to permit energy recovery and charge an accumulator to store supplies energy. The drive system may be combined with other services including a transmission for incorporation in a vehicle. The transmission uses a pressure compensated supply and torque control of the wheels.
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