Electro-hydraulic actuator or positioning drive for continuous c

Details Electro-hydraulic actuator or positioning drive for continuous c Electro-hydraulic actuator or positioning drive for continuous c

1985-04-30

1987-03-10

Husar, Stephen F.

Power plants

Pressure fluid source and motor

Ram driven by fluid pumped from reservoir

60387, F16D 3102

Patent

active

046482458

ABSTRACT:
A piston sealed by a rolling membrane is arranged in a cylindrical housing comprising two components and this piston translates against the force of a return spring. A vibrating armature pump driven via two wires by a variable alternating voltage serves for operating the positioning drive. The vibrating armature pump draws hydraulic fluid from a reservoir chamber through an inlet opening and transports the hydraulic fluid through a return valve and through a first orifice into a pressure chamber. The piston is displaced downwardly conjointly with a piston rod. The pressure generated by the vibrating armature pump is dependent upon the applied voltage. A state of equilibrium between this pressure and the counterpressure of the spring arises such that the positioning drive is suitable for continuous control or regulation operations. The return valve comprises a membrane valve which decisively influences the intended working characteristics of the positioning drive, since it responds to small differences in pressure.

REFERENCES:
patent: 2040403 (1936-05-01), Persons
patent: 2669095 (1954-02-01), Bishofberger
patent: 3285267 (1966-11-01), Groth
patent: 4355653 (1982-10-01), Credle, Jr.
patent: 4458487 (1984-07-01), Kojima et al.

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