Hydraulic control device

Details Hydraulic control device Hydraulic control device

1981-01-21

1983-11-15

Maslousky, Paul E.

Motors: expansible chamber type

Moving cylinder

Cylinder and piston have relative reciprocation on fixed axis

92128, 92166, 92171, F01B 1500, F16J 1104

Patent

active

044148810

ABSTRACT:
The invention provides a hydraulic servo-control device which performs the same functions as a conventional device but is much cheaper to manufacture and maintain.
For this purpose, the control device comprises a cylinder device formed by a cylinder and a piston rigid with a rod and a hydraulic control unit whose body is rigid with the cylinder. The body of the hydraulic control unit defines a cavity for receiving the cylinder of the cylinder device and this cylinder is made in two main parts, namely a case partly received in the cavity and fixed to the body of the hydraulic control unit, and a tubular sleeve which is axially and radially positioned inside the case and the cavity and cooperates with the piston.
Application in particular in the control of the pitch of the blades of a helicopter or the ailerons of a light aircraft.

REFERENCES:
patent: 3158068 (1964-11-01), Bokelman
patent: 3176721 (1965-04-01), Gordon
patent: 4050359 (1977-09-01), Mayer
patent: 4207807 (1980-06-01), Takata et al.

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