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Title:
PRESSUREECOMPENSATION CONTROLLING SYSTEM FOR ELECTROO HYDRAULIC SERVO PRESSURIZING APPARATUS
Document Type and Number:
Japanese Patent JPS55115603
Kind Code:
A
Abstract:
PURPOSE:To compensate pressure drop in a pressurizing chamber due to oil leakage, by employing an arrangement in which a pump designed to be driven when displacement of the piston exceeds a predetermined limited range is connected to a pressurizing chamber via an orifice and a check valve. CONSTITUTION:Pump 23 is connected to pressurizing chamber 17 via orifice 24 and check valve 25, and a first and a second limit switches 26, 27 are disposed respectively at the front limit position and at the rear limit position of piston rod 16. Here, arrangement is such that pump 23 is driven by the signal afforded from the first limit switch 26 and its operation is stopped by the signal afforded from the second limit switch 27. With such an arrangement, when pressure in chamber 17 is lowered due to oil leakage and displacement of piston rod 16 exceeds the predetermined limited range, pump 23 is set into operation and pressurized oil is supplemented to chamber 17, so that pressure drop in chamber 17 caused by oil leakage can be compensated.

Inventors:
UNO HIROSHI
KOSHIZUKA TOKUO
TAKEUCHI FUMIO
Application Number:
JP2285579A
Publication Date:
September 05, 1980
Filing Date:
February 28, 1979
Export Citation:
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Assignee:
SAGINOMIYA SEISAKUSHO INC
International Classes:
F15B11/028; F15B3/00; F15B11/02; F15B19/00; G01M3/26; G01N3/12; (IPC1-7): F15B11/02; F15B19/00



 
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