Title:
作業車両の油圧回路
Document Type and Number:
Japanese Patent JPWO2004061313
Kind Code:
A1
Abstract:
The present invention includes an undercarriage (1), a revolving superstructure (2) rotatably mounted atop the undercarriage (1), a hydraulic source (21, 28) disposed at the revolving superstructure (2), at least a plurality of work hydraulic cylinders (11) disposed at the undercarriage (1), that are to be driven by pressure oil from the hydraulic source (28), a control valve (22) that controls flow of pressure oil from the hydraulic source (28) to the work hydraulic cylinders (11), an operating means (26) for issuing a command for drive of the control valve (22), valve devices (12a, 12b) each comprising a check valve, each provided in correspondence to one of the plurality of work hydraulic cylinders (11) to allow and prohibit outflow of pressure oil from a work hydraulic cylinder (11), a commanding means (41, 42) for outputting one of a command for allowing extension/contraction and a command for prohibiting extension/contraction for each of the work hydraulic cylinders (11) and a control means (34 to 36, 43 to 48) for controlling each of the valve devices (12a, 12b) so as to allow outflow of pressure oil from the work hydraulic cylinder (11) by invalidating a check valve function thereof in response to the command for allowing extension/contraction output from the commanding means (41) and so as to prohibit outflow of pressure oil from the work hydraulic cylinder (11) with the check valve in response to the command for prohibiting extension/contraction.
Inventors:
Hidetoshi Satake
Hiroshi Tsukui
Kazuhiro Ichimura
Yuu Onoue
Hiroshi Tsukui
Kazuhiro Ichimura
Yuu Onoue
Application Number:
JP2004564452A
Publication Date:
May 11, 2006
Filing Date:
December 27, 2002
Export Citation:
Assignee:
Hitachi Construction Machinery Co., Ltd.
International Classes:
F15B11/08; B60S9/12; E02F9/08; E02F9/22; F15B11/00; F15B11/20; F15B13/042
Attorney, Agent or Firm:
Fuyuki Nagai