Title:
油圧システム
Document Type and Number:
Japanese Patent JP6726127
Kind Code:
B2
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:
Tetsuhiro Kondo
Application Number:
JP2017067526A
Publication Date:
July 22, 2020
Filing Date:
March 30, 2017
Export Citation:
Assignee:
Kawasaki Heavy Industries, Ltd.
International Classes:
F15B20/00; E02F9/22; F15B11/02; F15B11/08
Domestic Patent References:
| JP2004360898A | ||||
| JP2011149509A | ||||
| JP2016114129A | ||||
| JP2005265062A | ||||
| JP2011256814A |
Foreign References:
| WO1996027741A1 | ||||
| WO1990007651A1 |
Attorney, Agent or Firm:
Patent business corporation Yuko patent office