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Title:
ACTUATION SYSTEM
Document Type and Number:
Japanese Patent JP3701511
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: 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.
SOLUTION: 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:
Fumihiro Hayashi
Asada Satoru
Application Number:
JP17154499A
Publication Date:
September 28, 2005
Filing Date:
June 17, 1999
Export Citation:
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Assignee:
Nabtesco Co., Ltd.
International Classes:
B64C13/42; F15B9/09; F15B11/028; F15B20/00; (IPC1-7): F15B20/00; B64C13/42
Domestic Patent References:
JP10230898A
JP9328098A
JP63308204A
JP6300014A
JP61014202U
JP9296807A
Attorney, Agent or Firm:
Gunichiro Ariga



 
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