Title:
HYDRAULIC SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/220565
Kind Code:
A1
Abstract:
This hydraulic system is provided with: a variable capacity pump; a valve unit that includes a plurality of control valves for a plurality of hydraulic actuators; a regulator that regulates the discharge flow rate of the pump so that the pressure difference between the discharge pressure of the pump and the maximum load pressure of the plurality of hydraulic actuators is constant, the regulator having the minimum discharge flow rate being mechanically set to a value greater than zero; relief valves that are disposed upstream of the plurality of control valves and that limit the circuit upper limit pressure; and an unloader valve that is disposed downstream of the plurality of control valves, that allows circulation of a working fluid from the pump to a tank when the plurality of control valves are not operated, and that blocks circulation of the working fluid from the pump to the tank when at least one of the plurality of control valves is operated.
Inventors:
FUJIWARA HIROAKI
ITO NOBORU
MATSUO MASAHIRO
IMAMURA YUKITO
ITO NOBORU
MATSUO MASAHIRO
IMAMURA YUKITO
Application Number:
PCT/JP2018/018925
Publication Date:
November 21, 2019
Filing Date:
May 16, 2018
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
F15B11/00
Foreign References:
| JP2011501062A | 2011-01-06 | |||
| JP2001355612A | 2001-12-26 | |||
| JP2007270846A | 2007-10-18 | |||
| JPS59177803U | 1984-11-28 | |||
| JPH11510889A | 1999-09-21 |
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)
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