Power transmission

Details Power transmission Power transmission

1981-05-18

1983-10-04

Nilson, Robert G.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

91433, 91455, 91461, F15B 704

Patent

active

044071221

ABSTRACT:
A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions, a pump for supplying fluid to said actuator, pilot operated meter-in valve means to which the fluid from the pump is supplied for controlling the direction of movement of the actuator, pilot operated meter-out valve means associated with each opening of the actuator for controlling the flow out of said actuator. The pressure of fluid being supplied to the actuator by the meter-in valve means is sensed and caused to produce a force opposing the movement of the meter-in valve means by the pilot pressure resulting in a smooth and accurate control of the movement of the actuator.

REFERENCES:
patent: 2931389 (1960-04-01), Moog
patent: 3015317 (1962-01-01), Buchanan
patent: 3807447 (1974-04-01), Masuda
patent: 3859791 (1975-01-01), Allen
patent: 4201052 (1980-05-01), Breeden
patent: 4250794 (1981-02-01), Haak

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