Electrohydraulic follow-up control apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Mar 3, 1981
Grant Date -
N/A
app pub date -
Jul 6, 1979
filing date -
Jul 7, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electrohydraulic follow-up amplifier comprises a hydraulically operated prime mover constituted by a cylinder and a piston axially movable therein and fixedly connected to a connecting member. The arrangement includes further an electronically controlled motor, for instance a direct current servomotor driving for instance a nut meshing with the threaded spindle carrying a control member cooperating with valves for control flow of pressure fluid into and out from cylinder chambers to opposite sides of said piston of said prime mover. The spindle is connected to the connecting member over a coupling comprising a cylinder fixed to the connecting member and a piston fixed to the spindle. The piston of the coupling is movable between two abutments, one of which is adjustable by feeding pressure fluid into cylinder chambers to opposite sides of said piston of the coupling and flow of such pressure fluid is controlled by an additional valve which in turn in controlled from a cam disk which is turned in dependence on the movement of the connecting member.
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