Hydraulic pivot drive

Details Hydraulic pivot drive Hydraulic pivot drive

1985-09-03

1987-01-06

Garrett, Robert E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

91380, 91457, 92121, F15B 910

Patent

active

046337598

ABSTRACT:
A hydraulic pivot drive comprising a rotary-piston hydraulic cylinder and control device for maintaining the pressure difference between pressure chambers defined by the rotary vane and at least one radial wall of the cylinder housing required for maintaining a defined relative rotary position between the vane and the housing of the rotary piston hydraulic cylinder. The control a follow-up control valve, wherein the actual condition relative to the pivot angle is fed back via a measuring spindle coupled with the rotating part of the rotary piston hydraulic cylinder and the desired value is pre-set by rotation of a spindle nut engaging the spindle, an actuating member arranged for axial displacement together with the spindle nut and for actuating pairs of seat valves for enabling alternative connection of the at least two pressure chambers of the rotary-piston hydraulic cylinder with a system to obtain the desired rotation.

REFERENCES:
patent: 1665966 (1928-04-01), Kupka
patent: 2910967 (1959-11-01), Rosebrook
patent: 3269737 (1966-08-01), Freese
patent: 3310284 (1967-03-01), Seiuemoninaba et al.
patent: 3381712 (1968-05-01), Wittren et al.
patent: 3457836 (1969-07-01), Henderson
patent: 3680982 (1972-08-01), Jacobellis
patent: 4369693 (1983-01-01), Schulze

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