Title:
流体圧回路および作業機械
Document Type and Number:
Japanese Patent JP6601835
Kind Code:
B2
Abstract:
Provided are a hydraulic circuit and a work machine in which hydraulic fluid pushed out from a head side of a hydraulic cylinder can be effectively utilized to be accumulated in an accumulator and thrust necessary to contract the hydraulic cylinder is easily obtained with a simple structure when the contracting load is large. Pressure oil from a head side of a boom cylinder (7cl) is accumulated in a first accumulator (46) with a pressure acclimating circuit (A) through a control valve (61) which changes a communication amount between the head side of the boom cylinder (7cl) and the first accumulator (46) in accordance with the degree of operation of a lever. When the axial force of the boom cylinders (7cl), (7c2) is equal to or more than a predetermined value, the hydraulic oil is returned to a tank (21) by communicating between rod sides and between head sides of the boom cylinders (7cl), (7c2) by a main control valve (62), and the hydraulic oil is fed to the rod side of the boom cylinders (7cl), (7c2) by a boom control valve (26), the hydraulic oil being fed under pressure from a main pump (12) in the state where the control valve (61) and the tank (21) are communicated by a bleed-off valve (63).
Inventors:
Koji Kishida
Mitsuhiro Toyota
Yoshihiko Hata
Yukina Kinawa
Shuhei Iimoto
Nobuaki Matoba
Mitsuhiro Toyota
Yoshihiko Hata
Yukina Kinawa
Shuhei Iimoto
Nobuaki Matoba
Application Number:
JP2015086580A
Publication Date:
November 06, 2019
Filing Date:
April 21, 2015
Export Citation:
Assignee:
CATERPILLAR INCORPORATED
International Classes:
F15B21/14; E02F9/22; F15B11/02; F15B11/024
Domestic Patent References:
| JP2009275775A | ||||
| JP2007170485A | ||||
| JP2008101414A | ||||
| JP2014145387A | ||||
| JP2010060057A | ||||
| JP2008267595A | ||||
| JP2008121893A |
Foreign References:
| US20090000290 | ||||
| US20090025379 |
Attorney, Agent or Firm:
樺澤 襄
Satoshi Kabazawa
Tetsuya Yamada
Satoshi Kabazawa
Tetsuya Yamada