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Patent Searching and Data


Title:
HYDRAULIC ACTUATOR
Document Type and Number:
Japanese Patent JP2001050201
Kind Code:
A
Abstract:

To prevent excessive force acting from an actuator to an equipment by performing a feedback control for an operating part based on positional information on the detected operating part and pressure information on pressure oil for operating the operating part.

When an opening/closing control of a valve 15 is performed, opening of the valve 15 is detected by an opening sensor 23 and hydraulic fluid pressure supplied from servo valves 19 within hydraulic chambers 16, 17 to a hydraulic cylinder 11 is detected by pressure sensors 25, 26. When pressure is in a normal state, a feedback control is performed for opening of the valve 15 based on a valve opening signal 24. When the valve 15 is in an abnormal state such as excessive load, the abnormal state is detected by the pressure sensors 25, 26 and the corresponding pressure signals 27, 28 are supplied to a controller 20. The controller 20 performs feedback controls for the valves 19 so that hydraulic fluid supplied to the cylinder 11 may be set pressure or below. As a result, excessive force which is more than required one is not imparted from the cylinder 11 to the valve 15 and an adverse effect on the valve 15 is prevented.


Inventors:
Tomimatsu, Takaaki
Application Number:
JP1999000221848
Publication Date:
February 23, 2001
Filing Date:
August 05, 1999
Export Citation:
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Assignee:
KUBOTA CORP
International Classes:
F15B9/09; (IPC1-7): F15B9/09
Attorney, Agent or Firm:
森本 義弘