Title:
HYDRAULIC SYSTEM OF CONSTRUCTION MACHINE
Document Type and Number:
Japanese Patent JP2021032319
Kind Code:
A
Abstract:
To provide a hydraulic system of a construction machine capable of disabling operations on an operation device without using a dedicated solenoid valve for disabling the operations on the operation device.SOLUTION: A hydraulic system 1A comprises a plurality of control valves 4 interposed between a main pump 22 and a plurality of hydraulic actuators, and a plurality of electromagnetic proportional valves 6 respectively connected to pilot ports of the control valves 4. A first electromagnetic proportional valve 6a and a second electromagnetic proportional valve 6b of the electromagnetic proportional valves 6 are respectively connected to a pair of pilot ports of a specific control valve. The first electromagnetic proportional valve 6a and the second electromagnetic proportional valve 6b are directly connected to an auxiliary pump 23, and the other electromagnetic proportional valves 6 are connected to the auxiliary pump 23 via a selector valve 52. The selector valve 52 has a pilot port connected by a first pilot line 5a and a switching pilot line 54 between the first electromagnetic proportional valve 6a and the specific control valve.SELECTED DRAWING: Figure 1
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Inventors:
KONDO TETSUHIRO
HATA NAOKI
NAKAGAWA HITOSHI
HATA NAOKI
NAKAGAWA HITOSHI
Application Number:
JP2019152662A
Publication Date:
March 01, 2021
Filing Date:
August 23, 2019
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD
International Classes:
F15B11/08; E02F9/22; F15B20/00
Attorney, Agent or Firm:
Patent business corporation Yuko patent office