Power plants – Pressure fluid source and motor – Servo-motor having externally operated control valve sets...
Reexamination Certificate
2005-08-09
2005-08-09
Look, Edward K. (Department: 3745)
Power plants
Pressure fluid source and motor
Servo-motor having externally operated control valve sets...
C091S506000
Reexamination Certificate
active
06925799
ABSTRACT:
The speed control apparatus for a hydraulic actuator includes a hydraulic source, an actuator connected with the hydraulic source and driven based on a supply of an operation oil, a direction switching valve which is switchably installed in a flow path between the hydraulic source and the actuator, an inclination piston which is installed between a parallel flow path in parallel connected with a flow path in a supply side of the actuator and the actuator for thereby controlling an inclination angle of an inclination plate of the actuator, a multi-step adjusting inclination piston which is driven when an operation oil is supplied, and adjusts an inclination angle of an inclination plate of the actuator based on multiple steps, and a multi-step adjusting control valve which is switchably installed in a flow path between the parallel flow path and the multi-step adjusting inclination piston, controls an operation oil supplied to the multi-step adjusting inclination piston, and adjusts a speed of the actuator. The multi-step adjusting control valve is formed of a first zone in which the actuator is rotated at a high speed, a second zone in which the actuator is rotated at an intermediate speed, and a third zone in which the actuator is rotated at a low speed.
REFERENCES:
patent: 3779137 (1973-12-01), Koivunen
patent: 4072442 (1978-02-01), Horiuchi
patent: 5085052 (1992-02-01), Kawanaka et al.
patent: 5649468 (1997-07-01), Tsurumi et al.
patent: 5794515 (1998-08-01), Bethke
patent: 6668549 (2003-12-01), Yano et al.
patent: 10 311424 (1998-11-01), None
English Abstract of JP 10 311424 dated Nov. 24, 1998.
Leslie Michael
Look Edward K.
Volvo Construction Equipment
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