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Patent Searching and Data


Title:
HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2021/039285
Kind Code:
A1
Abstract:
A hydraulic system (1) for a construction machine, including: a plurality of control valves (41) interposed between a variable-capacity main pump (22) and a plurality of hydraulic actuators; and a first electromagnetic proportional valve (43) each connected to a pilot port in the control valves (41). The hydraulic system (1) also includes: a regulator (9) that changes the capacity of the main pump (22); and a second electromagnetic proportional valve (62) that outputs secondary pressure to the regulator (9) through a secondary pressure line (63) and is connected to an auxiliary pump (23) by a primary pressure line (61). A switching valve (52) having a pilot port connected to the secondary pressure line (63) by a pilot line (64) is interposed between the auxiliary pump (23) and the first electromagnetic proportional valve (43).

Inventors:
KONDO AKIHIRO
HATA NAOKI
KINOSHITA NOBUYUKI
Application Number:
PCT/JP2020/029481
Publication Date:
March 04, 2021
Filing Date:
July 31, 2020
Export Citation:
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Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
F15B11/08; E02F9/22
Foreign References:
JP2017110672A2017-06-22
JPH1061604A1998-03-06
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)
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