Title:
HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2021/039284
Kind Code:
A1
Abstract:
A hydraulic system (1A) for a construction machine according to one aspect includes: a plurality of control valves (41) interposed between a main pump (22) and a plurality of hydraulic actuators; and a plurality of first solenoid proportional valves (43) respectively connected to pilot ports of the control valves (41). In addition, the hydraulic system (1A) includes: an unload valve (9) having a pilot port; and a second solenoid proportional valve (62) connected to the pilot port of the unload valve (9) by a secondary pressure line (63) and connected to an auxiliary pump (23) by a primary pressure line (61). A switching valve (52) is interposed between the auxiliary pump (23) and the first solenoid proportional valves (43), the switching valve (52) having a pilot port connected to the secondary pressure line (63) by a pilot line (64).
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Inventors:
KONDO AKIHIRO
HATA NAOKI
KINOSHITA NOBUYUKI
IWABE KAZUYA
HATA NAOKI
KINOSHITA NOBUYUKI
IWABE KAZUYA
Application Number:
PCT/JP2020/029480
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:
| JP2017110672A | 2017-06-22 | |||
| JPH1061604A | 1998-03-06 |
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)
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