Stroke control device with torque responsive motive fluid contro

Details Stroke control device with torque responsive motive fluid contro Stroke control device with torque responsive motive fluid contro

1990-12-12

1992-04-21

Look, Edward K.

Motors: expansible chamber type

Torque responsive motive fluid control

74388R, 60463, F01C 2112

Patent

active

051057190

ABSTRACT:
A stroke control device having a servomotor, a hydraulic cylinder having a piston, a ball-thread mechanism coupling the servomotor with the piston, and a hydraulic circuit including pressure control valves for driving the hydraulic cylinder. Further it has a numerical control unit for driving the servomotor based on the numerical input data representative of the movement and moving speed of the piston, for detecting signals representative of the load on the servomotor and for producing control signals to control the pressure control valves in the hydraulic circuit in response to the load signals to move the piston so that the load on the servomotor will approach zero.

REFERENCES:
patent: Re28899 (1976-07-01), Himmelstein et al.
patent: 2650669 (1953-09-01), Hammond
patent: 3128673 (1964-04-01), Moore, Jr.
patent: 3920082 (1975-11-01), Dudek
patent: 4205592 (1980-06-01), Haussler
patent: 4614248 (1986-09-01), Kakinami et al.
patent: 4669359 (1987-06-01), Shiba
patent: 4858436 (1989-08-01), Brusasco

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