MULTIPLE FUNCTION HYDRAULIC SYSTEM WITH A VARIABLE DISPLACEMENT PUMP AND A HYDROSTATIC PUMP-MOTOR
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United States of America Patent
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Issued Date -
Mar 6, 2014
app pub date -
Mar 15, 2012
filing date -
Mar 15, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A hydraulic system includes a first pump and a plurality of valves that control fluid flow from the first pump to several actuators. Variable source orifices in the control valves are connected in parallel between the first pump and a node, and variable bypass orifices in the control valves are connected in series between the node and a tank. Pressure at the node controls displacement of the first pump. Each control valve also has a metering orifice for varying fluid flow between the node and one of the actuators. A hydrostatic pump-motor, coupled between two ports of a given actuator, is driven in a motoring mode by fluid exiting one of those ports. In a pumping mode, the hydrostatic pump-motor forces lower pressure fluid exhausting from one port into the other port of the given actuator.
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