Title:
CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2023/199761
Kind Code:
A1
Abstract:
A lower traveling body (15) is provided with travel-motor control valves (23) for controlling the flow of hydraulic oil to be fed from a hydraulic pump (10) to travel hydraulic motors (20). A hydraulic oil tank (12) and the travel hydraulic motors (20) are connected via hydraulic piping (25). The hydraulic piping (25) comprises: a feeding low-pressure piping part (25A), a pump-side high-pressure piping part (25B), and valve-side high-pressure piping parts (25C), which connect the hydraulic oil tank (12), the hydraulic pump (10), and the travel-motor control valves (23); switching high-pressure piping parts (25D, 25E), which are provided to the lower traveling body (15) and which connect the travel-motor control valves (23) and the travel hydraulic motors (20); and valve-side low-pressure piping parts (25F) and a tank-side low-pressure piping part (25G), which are provided so as to span from the lower traveling body (15) to an upper slewing body (3) and which connect the travel-motor control valves (23) and the hydraulic oil tank (12).
Inventors:
HONDA TAKESHI (JP)
OKANO HAJIME (JP)
MURAYAMA YUUJI (JP)
YANASE YOSHITAKA (JP)
OKANO HAJIME (JP)
MURAYAMA YUUJI (JP)
YANASE YOSHITAKA (JP)
Application Number:
PCT/JP2023/013560
Publication Date:
October 19, 2023
Filing Date:
March 31, 2023
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
E02F9/00; E02F9/02
Foreign References:
| JP2004116034A | 2004-04-15 | |||
| JP2006070481A | 2006-03-16 | |||
| JP2016008416A | 2016-01-18 |
Attorney, Agent or Firm:
HIROWA PATENT FIRM (JP)
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