Title:
HYDRAULIC CIRCUIT OF CONSTRUCTION MACHINE
Document Type and Number:
Japanese Patent JP2014126103
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To prevent occurrence of revolution shock caused by a changing-over of a confluence valve at the time of boom lifting/boom revolution and further assure a superior horizontal pull-in operation.SOLUTION: This invention comprises a first circuit A to which a boom cylinder 6 belongs, a second circuit B to which an arm cylinder 7 belongs and a third circuit C to which a revolving motor 12 belongs, and further comprises a first pump 13 acting as a hydraulic source for the first circuit A, a second pump 14 acting as a hydraulic source for the second circuit B and a third pump 15 acting as a hydraulic source for the third circuit C, a confluence valve 22 is arranged at the upper-most stream side of the third circuit C and a confluence changing-over valve 37 is arranged at a connection part between the third circuit C and the second circuit B, respectively, and at the time of boom lifting/revolving operation and at the time of a single boom lifting operation, the confluence valve 22 is set at a first position (a) and the confluence valve 37 is set at a second position (b) and oil in the third pump is merged at the boom cylinder 6.
Inventors:
SAOTOME YOSHIMI
Application Number:
JP2012282480A
Publication Date:
July 07, 2014
Filing Date:
December 26, 2012
Export Citation:
Assignee:
KOBELCO CONSTR MACHINERY LTD
International Classes:
F15B11/02; E02F9/22; F15B11/00; F15B11/17
Attorney, Agent or Firm:
Etsushi Kotani
Masataka Otani
Muramatsu Toshiro
Masataka Otani
Muramatsu Toshiro