Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Reexamination Certificate
2006-10-24
2006-10-24
Kershteyn, Igor (Department: 3745)
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
C060S452000, C060S494000, C091S421000
Reexamination Certificate
active
07124577
ABSTRACT:
The present invention lowers energy loss while at the same time enhancing the responsiveness of a steering control system. When a steering controller is operated rapidly, the aperture area of a steering flow control valve4rapidly increases, and the differential pressure (Pp′-PL) across the steering flow control valve4rapidly decreases. When the differential pressure (Pp′-PL) across the steering flow control valve4rapidly decreases, a flow control valve6is biased by the spring force of a spring6fand quickly moves to the side of a valve position6bto increase the differential pressure (Pp′-PL) and make it correspond to a set pressure. Thus, the pressure oil of a surplus flow α, which up to this point has been flowing to a discharge oil line7, is quickly supplied from the flow control valve6to a steering hydraulic cylinder5via the steering flow control valve4. Thus, an output Q′ starts quickly relative to an input St.
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Asada Hisashi
Honda Nobuhisa
Hori Shuuji
Ishizaki Naoki
Nunotani Sadao
Kershteyn Igor
Komatsu Ltd.
Wenderoth , Lind & Ponack, L.L.P.
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