ROTARY SERVO VALVE

PURPOSE:To improve stop position setting accuracy and shorten control time by connecting the pressure passage of an input shaft, rotatably fitted into a feedback shaft, to one of the oil passages of an actuator, and providing a throttle part, changed by relative rotation, between the other oil passa...

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Bibliographic Details
Main Authors SAEKI KOYO, SAKAMOTO TOMOYOSHI
Format Patent
LanguageEnglish
Published 04.12.1991
Subjects
BLASTING
DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
FLUID-PRESSURE ACTUATORS
FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS
HEATING
HYDRAULICS OR PNEUMATICS IN GENERAL
LIGHTING
MECHANICAL ENGINEERING
SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL
WEAPONS
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Summary:PURPOSE:To improve stop position setting accuracy and shorten control time by connecting the pressure passage of an input shaft, rotatably fitted into a feedback shaft, to one of the oil passages of an actuator, and providing a throttle part, changed by relative rotation, between the other oil passage and a return passage. CONSTITUTION:An input shaft 22 is rotatably fitted into a feedback shaft 21 connected to a rotary actuator R, and the feedback shaft 21 is provided with a first to a third ports 36-38 communicated with the oil passages a, b of the rotary actuator R and a tank. A connected opening area among a pressure passage 42 connected to either one of the first and second ports 36, 37 by the relative rotation between both shafts 21, 22, a return groove 44 for connecting the other port to the tank and the third port 38 is to be changed by relative rotation among them. Stop position setting accuracy is thereby improved, and control time can be shortened.
Bibliography:Application Number: JP19900072955