Title:
HYDRAULIC DRIVE SYSTEM
Document Type and Number:
WIPO Patent Application WO/2014/013852
Kind Code:
A1
Abstract:
A hydraulic cylinder (14) lowers a working machine as a consequence of operation oil being discharged from a first chamber (14c) and the operation oil being supplied to a second chamber (14d). An operation oil flow path (15) has a first flow path (15a) and a second flow path (15b). The first flow path (15a) connects a first pump port (12a) with the first chamber (14c). The second flow path (15b) connects a second pump port (12b) with the second chamber (14d). The operation oil flow path (15) forms a closed circuit between a hydraulic pump (12) and the hydraulic cylinder (14). A bleed-off flow path (37) branches out of the first flow path (15a). A portion of the operation oil discharged from the first chamber (14c) when the working machine is lowered flows into the bleed-off flow path (37).
Inventors:
AKIYAMA TERUO (JP)
IIDA NOBORU (JP)
SAITO KOJI (JP)
WATANABE TAKAYUKI (JP)
IIDA NOBORU (JP)
SAITO KOJI (JP)
WATANABE TAKAYUKI (JP)
Application Number:
PCT/JP2013/067615
Publication Date:
January 23, 2014
Filing Date:
June 27, 2013
Export Citation:
Assignee:
KOMATSU MFG CO LTD (JP)
International Classes:
E02F9/22; F15B11/02; F15B11/08
Foreign References:
| JPS5943703U | 1984-03-22 | |||
| JPS6233947A | 1987-02-13 | |||
| JPS57144601U | 1982-09-10 |
Attorney, Agent or Firm:
Shinjyu Global IP (JP)
fresh green -- a global IP patent business corporation (JP)
fresh green -- a global IP patent business corporation (JP)
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