Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Reexamination Certificate
2007-10-30
2007-10-30
Lopez, F. Daniel (Department: 3745)
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
Reexamination Certificate
active
10465772
ABSTRACT:
A main spool is located in a bypass line connecting a pump line to a return line. The main spool moves in an axial direction according to the pressure in a spring chamber and the pressure in a pilot chamber, thereby adjusting the opening degree of the bypass line. A pilot switching valve is located in a pressure control passage connecting the spring chamber to the return line. The pilot switching valve controls the flow rate of hydraulic oil that flows from the spring chamber to the return line in accordance with the load pressure of a hydraulic actuator, thereby adjusting the pressure of hydraulic oil in the spring chamber. As a result, the range of the flow rate of hydraulic oil supplied to the hydraulic actuator, which range precludes the influence of the load pressure of the hydraulic actuator, is expanded.
REFERENCES:
patent: 4468173 (1984-08-01), Dantlgraber
patent: 4845947 (1989-07-01), Persson et al.
patent: 5537819 (1996-07-01), Kobayashi
patent: 11-315803 (1999-11-01), None
Goto Tetsuya
Ichikawa Keinosuke
Maeda Yasuhiro
Matsuzaki Takeharu
Nakajima Shigeto
Kabushiki Kaisha Toyota Jidoshokki
Lopez F. Daniel
Morgan & Finnegan L.L.P.
Nishina Industrial Co. Ltd.
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