Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Reexamination Certificate
2007-03-27
2007-03-27
Lazo, Thomas E. (Department: 3745)
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
C060S469000
Reexamination Certificate
active
11139687
ABSTRACT:
A hydraulic control system for a work machine is disclosed. The hydraulic control system has a source of pressurized fluid and at least one actuator having a first and a second chamber. The hydraulic control system also has a first independent metering valve disposed between the source and the first chamber, and a second independent metering valve disposed between the reservoir and the second chamber. The first and second independent metering valves each have a valve element movable from a flow blocking to a flow passing position to facilitate movement of the at least one actuator. The hydraulic control system further has an accumulator and a third independent metering valve disposed in parallel with the first independent metering valve and between the accumulator and the first chamber. The third independent metering valve is configured to selectively communicate the accumulator with the first chamber to cushion movement of the at least one actuator.
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Egelja Aleksandar M.
Ma Pengfei
Sorokine Mikhail A.
Caterpillar Inc
Finnegan Henderson Farabow Garrett & Dunner
Lazo Thomas E.
Shin Caterpillar Mitsubishi Ltd
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