Title:
HYDRAULIC PRESSURE DRIVE DEVICE OF CONSTRUCTION MACHINERY
Document Type and Number:
Japanese Patent JP2948065
Kind Code:
B2
Abstract:
PURPOSE: To supply pressure oil to either an arm cylinder or a boom cylinder by giving priority.
CONSTITUTION: There are provided an arm operation detector A which detects the operation of an arm cylinder 4 and a boom operation detector B which detects the operation of a boom cylinder 5 and an arm load pressure detector 60. When it is determined by means of a controller 30 that both operation signals transmitted from the arm operation detector A and the boom operation detector B are detected, an arm signal pressure and a boom signal pressure are determined based on function relations which are predetermined in conformity with the types of arm/boom composite operation configurations and which vary from each other and a signal detected with the arm load pressure detector 60. These signal pressure are given to a first solenoid valve 32 and a second solenoid valve 33, which makes it possible to output control pressures Fa1 and Fa2 whose values are different from each other, to a drive unit of an arm pressure compensation valve 7 and a drive unit of a boom pressure compensation valve 11 respectively from the first solenoid valve 32 and the second solenoid valve 33.
Inventors:
NAKAMURA KAZUNORI
KAJITA JUSUKE
KAJITA JUSUKE
Application Number:
JP22122693A
Publication Date:
September 13, 1999
Filing Date:
September 06, 1993
Export Citation:
Assignee:
HITACHI KENKI KK
International Classes:
E02F9/22; F15B11/00; F15B11/05; F15B11/16; (IPC1-7): E02F9/22; F15B11/00; F15B11/05; F15B11/16
Domestic Patent References:
| JP2118203A | ||||
| JP776861A | ||||
| JP4285303A | ||||
| JP2190537A |
Attorney, Agent or Firm:
Kenjiro Take (1 person outside)
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