Title:
WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2018/092582
Kind Code:
A1
Abstract:
This work machine is provided with: control valves (41-43) that control a flow of hydraulic oil supplied to actuators (31-33); operation lever devices (51-53) that generate, in response to operations thereof, hydraulic signals to be outputted to the corresponding control valves; proportional electromagnetic valves (61b...) that reduce pressure of the hydraulic signals generated by the corresponding operation lever devices; and a front control unit that controls the proportional electromagnetic valves. The work machine is further provided with: operation signal lines (51a1, 51b1...) that are connected to the operation lever devices; signal input lines (51a2, 51b2...) that are connected to the control valves; pressure reduction lines (51b3...) to which the proportional electromagnetic valves are provided; and switching valves (81b...) that each have a first position (A) where the corresponding one of the operation signal lines is directly connected to the corresponding one of the signal input lines by cutting off connection between the operation signal line and the corresponding pressure reduction line and a second position (B) where the operation signal line is coupled to the signal input line having the pressure reduction line therebetween.
Inventors:
TAKEUCHI HIROKI (JP)
ISHIKAWA KOUJI (JP)
IZUMI SHIHO (JP)
MEGURIYA SHUUICHI (JP)
AKITA TAROU (JP)
ISHIKAWA KOUJI (JP)
IZUMI SHIHO (JP)
MEGURIYA SHUUICHI (JP)
AKITA TAROU (JP)
Application Number:
PCT/JP2017/039400
Publication Date:
May 24, 2018
Filing Date:
October 31, 2017
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
F15B11/08; E02F3/43; E02F9/22; F15B11/046
Foreign References:
| JP3091667B2 | 2000-09-25 | |||
| JP2000220601A | 2000-08-08 |
Other References:
See also references of EP 3543545A4
Attorney, Agent or Firm:
KAICHI IP (JP)
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