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Title:
WORK MACHINE
Document Type and Number:
Japanese Patent JP2013199760
Kind Code:
A
Abstract:

To provide a work machine which includes a fluid pressure raising/reducing machine capable of more flexibly controlling an accumulator and an assist cylinder.

A shovel 50 includes: an assist cylinder 20 for assisting a boom cylinder 17; an accumulator 21; and a hydraulic pressure raising/reducing machine 100. The hydraulic pressure raising/reducing machine 100 includes: a control device 5 which selects, in a switchable manner, an input pressure chamber where input pressure is applied and an output pressure chamber generating output pressures including pressures higher and lower than the input pressure, from a head side pressure chamber 1H and a rod side pressure chamber 1R of a hydraulic pressure cylinder 1 and a head side pressure chamber 2H and a rod side pressure chamber 2R of a hydraulic pressure cylinder 2; and flow control valves 6H, 6R, 7H and 7R communicating the input pressure chamber with a supply source SR and also communicating the output pressure chamber with a supply source SD. The accumulator 21 is an input and the assist cylinder 20 is an output.


Inventors:
TSUKANE KOICHIRO
Application Number:
JP2012000068370
Publication Date:
October 03, 2013
Filing Date:
March 23, 2012
Export Citation:
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Assignee:
SUMITOMO HEAVY INDUSTRIES
International Classes:
E02F9/22; F15B3/00; F15B21/14
Domestic Patent References:
JPH0524480A1993-02-02
JP3628365B22005-03-09
JP4659310B22011-03-30
JPH0524480Y21993-06-22
JP3628365B22005-03-09
JP4659310B22011-03-30
Attorney, Agent or Firm:
伊東 忠彦