Title:
WORK MACHINE
Document Type and Number:
Japanese Patent JP2021161611
Kind Code:
A
Abstract:
To provide a work machine capable of improving the stability of the behavior of a work device by improving the flow rate controllability.SOLUTION: The work machine comprises: a bleed-off flow control valve 170 that is provided in a bleed-off pipe line 173a connecting a supply pipe line 49a for supplying a pressure oil discharged from a hydraulic pump 49 to flow control valves 15a, 15b, 15c and a hydraulic oil tank 173, and controls the flow rate of the pressure oil in the bleed-off pipe line 173a by changing an opening area; and an MC control ON/OFF switch 96 that switches between enabling and disabling area limitation control. A controller 40 controls the opening area of the bleed-off flow control valve 170 in response to an operation signal instructing to lower a boom 8 when the area limitation control is enabled by the MC control ON/OFF switch 96.SELECTED DRAWING: Figure 5
Inventors:
ISHII HIRONORI
YAMAMOTO SHINJIRO
YAMAMOTO SHINJIRO
Application Number:
JP2020060770A
Publication Date:
October 11, 2021
Filing Date:
March 30, 2020
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
E02F9/20; F15B11/024; F15B11/044; F15B11/08
Domestic Patent References:
| JP2018003516A | 2018-01-11 | |||
| JP2018145894A | 2018-09-20 | |||
| JP2016205497A | 2016-12-08 | |||
| JP2018003513A | 2018-01-11 | |||
| JP2018053474A | 2018-04-05 | |||
| JP2011127727A | 2011-06-30 |
Attorney, Agent or Firm:
Kaichi International Patent Office