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Title:
OPERATION CONTROLLER FOR ACCUMULATOR
Document Type and Number:
Japanese Patent JPH09184591
Kind Code:
A
Abstract:

To reduce response delay of an actuator in starting of work in the cold district by providing an on-off valve between a discharging line of a hydraulic pump and an oil pressure pulsation restraining accumulator, and holding the on-off valve in the shut-off position when the oil temperature is not more than the specified temperature.

An on-off valve 5 of a solenoid valve is provided on a line between an accumulator 3 and a discharging line 2 of a hydraulic pump 1. The whole valve driving circuit 7 for switching the on-off valve 5 is constituted of a computer placed on a construction machine such as a hydraulic shovel and an electric circuit or a circuit for putting or shutting a power source by the input. When the oil temperature detected by an oil temperature sensor 6 is not more than the prescribed temperature, the on-off valve 5 is held in the shut-off position. Therefore, response delay of the actuators 4 in starting of work in the cold district can be reduced.


Inventors:
Isobe, Hiroyuki
Hirami, Ichiro
Application Number:
JP1995000352997
Publication Date:
July 15, 1997
Filing Date:
December 28, 1995
Export Citation:
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Assignee:
HITACHI CONSTR MACH CO LTD
International Classes:
F04B11/00; F15B1/00; F15B1/02; F16L55/04; (IPC1-7): F16L55/04; F04B11/00; F15B1/00; F15B1/02
Attorney, Agent or Firm:
若田 勝一



 
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