Title:
HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2021/039283
Kind Code:
A1
Abstract:
In one aspect of the invention, a hydraulic system (1A) of a construction machine comprises a plurality of control valves (41) interposed between a main pump (22) and a plurality of hydraulic actuators, and a plurality of first electromagnetic proportional valves (43) connected to pilot ports of the respective control valves (41). Further, the hydraulic system (1A) includes a brake (83) for a swivel motor (81), and a second electromagnetic proportional valve (62) that is connected by a secondary pressure line (63) to a brake release port (84) of the brake (83) and is connected by a primary pressure line (61) to an auxiliary pump (23). A switching valve (52) having a pilot port connected by a pilot line (64) to the secondary pressure line (63) is interposed between the auxiliary pump (23) and the first electromagnetic proportional valve (43).
Inventors:
KONDO AKIHIRO
MURAOKA HIDEYASU
TODE YOSHIYUKI
MURAOKA HIDEYASU
TODE YOSHIYUKI
Application Number:
PCT/JP2020/029478
Publication Date:
March 04, 2021
Filing Date:
July 31, 2020
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
F15B11/08; E02F9/22
Foreign References:
| JP2017105582A | 2017-06-15 |
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)
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