Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1990-08-15
1991-06-04
Kwon, John T.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91380, 74 8915, 744248R, F15B 912, F15B 914
Patent
active
050204173
ABSTRACT:
A fluid-powered servo actuator having a body, an annular piston, and a shaft extending co-axially therewithin. The shaft has an interior chamber located within the body with two fluid channels extending to the chamber in which the piston is mounted. One channel communicates with each side of the piston. A valve spool is positioned in the shaft chamber, and a cam follower or threads are used to longitudinally move the valve spool therewithin in response to its selected rotation. The valve spool has a pair of valve lands which, when in a neutral position, close the two channels. When the valve spool is moved longitudinally, pressurized fluid is communicated with one or the other of the channels to cause the piston to move longitudinally. Splines or rollers convert the longitudinal movement of the piston into rotational movement of the shaft. The cam follower or threads cause the resulting rotational movement of the shaft to move the valve spool back to the neutral position when the shaft has rotated by an amount and in a direction corresponding to the selected amount and direction the valve spool was rotated.
REFERENCES:
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Sperbeck, A. J., "Totally Digital Valves Fully Utilize Hydraulic Servos", Hydraulics & Pneumatics, pp. 65-66, Dec., 1987.
Budzilovich, P. N., "Use Electrohydraulic Stepping Motors for All-Digital Drives", Control Engineering, pp. 82-88, Jan., 1970.
Description of the "Olsen" Rotary Electro-Hydraulic Pulse Drive, Olsen Controls, Inc., two pages.
Schneider, Richard (ed.), "Fluid Power/Ideas and Applications", Hydraulics & Pneumatics, pp. 18 and 20, Jan., 1987.
MTS Brochure, "A Family of Actuators to Power most any Controlled Positioning of Velocity Requirement", MTS Systems Corporation, pp. 1-6.
Kapsalas George
Kwon John T.
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