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Title:
HYDRAULIC SYSTEM
Document Type and Number:
WIPO Patent Application WO/2018/178960
Kind Code:
A1
Abstract:
This hydraulic system comprises: an operation device; a control valve that, the larger the operation signal output from the operation device, increases the opening area of a passage that supplies hydraulic oil to a hydraulic actuator; a variable displacement pump; a regulator that, the higher the control pressure, increases the tilt angle of the pump; a first proportional solenoid valve and a second proportional solenoid valve that, the larger the operation signal output from the operation device, output a higher secondary pressure; an unload valve that, the higher the secondary pressure output from the first proportional solenoid valve, decreases the opening area from a fully opened state towards a fully closed state; and a high pressure selection valve that selects and guides to the regulator, as the control pressure, the highest amongst the secondary pressure output from the first proportional solenoid valve and the secondary pressure output from the second proportional solenoid valve.

Inventors:
KONDO, Akihiro
Application Number:
IB2018/053502
Publication Date:
October 04, 2018
Filing Date:
May 18, 2018
Export Citation:
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Assignee:
KAWASAKI JUKOGYO KABUSHIKI KAISHA (1-1 Higashikawasaki-cho 3-chome, Chuo-Ku Kobe-Shi, Hyogo 70, 〒6508670, JP)
International Classes:
F15B20/00; E02F9/22; F15B11/042; F15B11/08
Domestic Patent References:
WO1996027741A11996-09-12
WO1990007651A11990-07-12
Foreign References:
JP2004360898A2004-12-24
JP2011149509A2011-08-04
JP2016114129A2016-06-23
JP2005265062A2005-09-29
JP2011256814A2011-12-22
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (3rd Fl, Bo-eki Bldg. 123-1, Higashimachi,Chuo-K, Kobe-Shi Hyogo 31, 〒6500031, JP)
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