Electro-hydraulic actuator assembly

Details Electro-hydraulic actuator assembly Electro-hydraulic actuator assembly

1987-12-14

1989-10-10

Look, Edward K.

Power plants

Pressure fluid source and motor

Pulsator

60572, 60581, B60T 700

Patent

active

048723100

ABSTRACT:
An electro-hydraulic actuator assembly comprises a master piston-and-cylinder 32, 42 connected to be driven by a rotary actuator 56 and hydraulically connected to a slave master piston-and-cylinder 12 coupled to an output member, e.g. a throttle linkage rod 10, for automatic control of the displacement of the member 10. An override for manual control of the member 10 is provided by a valve 60 which, when opened, hydraulically shortcircuits the member 10 by equalizing pressures on the two sides of the slave piston 16. To re-establish automatic control and synchronize master and slave, a (possibly remote) controller 80 shuts the valve 60 and drives the actuator 56 until master and slave pistons both attain end positions; if necessary, by reopening valve 60 for a short time and continuing to drive the actuator 56.

REFERENCES:
patent: 1894055 (1933-01-01), Perkins
patent: 2431706 (1947-12-01), Nisbet et al.
patent: 2482792 (1949-09-01), Owen
patent: 2540879 (1951-02-01), Hebel et al.
patent: 2544134 (1951-03-01), Clark
patent: 2585389 (1952-02-01), Kehrl
patent: 2604757 (1952-07-01), Wulleman
patent: 3299637 (1967-01-01), Ballard
patent: 3579989 (1971-05-01), Stark et al.
patent: 3911677 (1975-10-01), Collins
patent: 4475442 (1984-10-01), Breeden

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