Title:
SERVO MOTOR FOR HYDRAULIC MACHINERY
Document Type and Number:
Japanese Patent JPS60241510
Kind Code:
A
Abstract:
PURPOSE:To simplify a construction around a servo motor in a hydraulic machinery by providing an auxiliary piston at an end of a piston and providing a stopper for preventing automatic restoration due to a spring and spring-out of the auxiliary piston. CONSTITUTION:An auxiliary piston 3 is mounted on a position of closing an exhaust oil path, when a servo motor is closed, at an end of a servo motor piston 2 for driving a guide blade. And a stopper 5 is provided which permits automatic restoration due to a spring 4 and prevents the auxiliary piston 3 from springing-out due to the spring 4. Thus, the length of a cylinder can be substantially shortened, compared with conventional servo motors.
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Inventors:
KAWADA MINORU
Application Number:
JP9648084A
Publication Date:
November 30, 1985
Filing Date:
May 16, 1984
Export Citation:
Assignee:
HITACHI LTD
International Classes:
F03B15/04; F15B15/22; (IPC1-7): F03B11/00
Attorney, Agent or Firm:
Akio Takahashi
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