Title:
HYDRAULIC SYSTEM OF WORK MACHINE
Document Type and Number:
Japanese Patent JP2015183776
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a hydraulic system of a work machine capable of controlling the center by-pass aperture area even when mounting an attachment without providing an exclusive center by-pass cut valve.SOLUTION: When an option attachment is non-mounted, a preliminary flow rate/directional control valve 8 is operated as a center by-pass cut valve; when the option attachment is mounted and the option attachment is not used, the preliminary flow rate/directional control valve 8 is operated as the center by-pass cut valve which regulates the composite center by-pass aperture area; and when using as a control function of the flow rate of oil flowing through an actuator, the preliminary flow rate/directional control valve 8 is operated so as to perform the switching control to the function to supply pressure oil to an option hydraulic actuator 14.
Inventors:
KANEDA TOMOAKI
ISHIKAWA KOJI
SATAKE HIDETOSHI
IMURA SHINYA
ISHIKAWA KOJI
SATAKE HIDETOSHI
IMURA SHINYA
Application Number:
JP2014060890A
Publication Date:
October 22, 2015
Filing Date:
March 24, 2014
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
F15B11/028; E02F9/22; F15B11/00; F15B11/08
Domestic Patent References:
| JP2011085198A | 2011-04-28 | |||
| JPH0610376A | 1994-01-18 | |||
| JP2013231464A | 2013-11-14 |
Attorney, Agent or Firm:
Kaichi International Patent Office