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Title:
HYDRAULIC ACTUATOR CONTROLLER
Document Type and Number:
Japanese Patent JP2003056506
Kind Code:
A
Abstract:

To provide a hydraulic actuator controller, capable of controlling a return liquid amount in a return liquid pipeline in a pressure reducing process further accurately and having superior practicality.

This hydraulic actuator controller controls increase or decrease of pressure of a hydraulic actuator 1 by a supply liquid amount in a supply liquid pipeline 2 or a return liquid amount in the return liquid pipeline 3. A variable discharge pump 4 for liquid feed is provided for normal liquid feed operation in the increase of the pressure of the hydraulic actuator 1 and also makes liquid feed operation when the pressure of the return liquid pipeline 3 positioned between a variable discharge pump 6 for return liquid and a opening/closing valve 7 for pressure reducing is lower than the set pressure. The variable discharge pump 6 is provided for normal liquid return operation in the pressure-reducing process of the hydraulic actuator 1 and additionally makes the pressure of the return liquid pipeline 3 set pressure, corresponding to the additional liquid feed operation of the variable discharge pimp 4 when the pressure of the return liquid pipeline 3 is lower than the set pressure.


Inventors:
HOSAKA JUNICHI
IGARASHI SHUICHI
Application Number:
JP2001000244082
Publication Date:
February 26, 2003
Filing Date:
August 10, 2001
Export Citation:
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Assignee:
RIKEN SEIKI KK
RIKEN KIKI KK
International Classes:
F15B11/02; F15B11/028; (IPC1-7): F15B11/02; F15B11/028
Domestic Patent References:
JP2002181006A2002-06-26
JPH10267006A1998-10-06
JPH0932802A1997-02-04
JPH06245717A1994-09-06
JPH01188781A1989-07-28
Attorney, Agent or Firm:
吉井 剛 (外1名)