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Patent Searching and Data


Title:
ACTUATION SYSTEM
Document Type and Number:
Japanese Patent JP2001003902
Kind Code:
A
Abstract:

To relax a trangent in switching to a mechanical back up mode and to ensure a predetermined actuator speed in the mechanical back up mode.

A restriction means 40 which can restrict a switching speed of a directional control valve 33 is provided on an oil passage for imparting a switching operation pressure Pa to the mode directional control valve 33 when the mode directional control valve 33 is switched such that a mechanical control valve 31 is inserted to a feeding/discharging passage of an operation oil to an actuator 10. When the mode directional control valve 33 inserts the mechanical control valve 31 to the feeding/discharging passage of the operation oil to the actuator 10 by a predetermined variation of the switching operation pressure Pa, a restriction means 40 is operated by a switching operation pressure variation. Thereby, an operation oil feeding/discharging control is temporarily restricted by the mechanical control valve 31 inserted to the operation oil feeding/discharging passage.


Inventors:
Hayashi, Fumihiro
Asada, Satoshi
Application Number:
JP1999000171544
Publication Date:
January 09, 2001
Filing Date:
June 17, 1999
Export Citation:
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Assignee:
TEIJIN SEIKI CO LTD
International Classes:
B64C13/42; F15B9/09; F15B11/028; F15B20/00; (IPC1-7): F15B9/09; B64C13/42; F15B11/028
Attorney, Agent or Firm:
有我 軍一郎