Title:
Work machine hydraulic drive system
Document Type and Number:
Japanese Patent JP6316776
Kind Code:
B2
Abstract:
A hydraulic drive system 100A for a work machine includes: a boom cylinder 4; an arm cylinder 8; a hydraulic pump device 51; a control valve 5; a regenerative device 61; a first operation device 41; a second operation device 42; a sensor device 71; and a controller 27. The sensor device 71 includes at least one of pressure sensors 23, 24, 25, and 26. The controller 27 includes an abnormality detection part 142 and a first control part. The abnormality detection part 142 determines whether or not the sensor device 71 is abnormal. If the sensor device 71 is abnormal, the first control part controls the regenerative device 61 such that the hydraulic fluid returning from the boom cylinder 4 is not supplied to the arm cylinder 8 even if the values measured by the sensor device 71 satisfy regenerative conditions.
Inventors:
Hijikata Seiji
Koji Ishikawa
Shinya Imura
Koji Ishikawa
Shinya Imura
Application Number:
JP2015117023A
Publication Date:
April 25, 2018
Filing Date:
June 09, 2015
Export Citation:
Assignee:
Hitachi Construction Machinery Co., Ltd.
International Classes:
E02F9/22; F15B20/00; F15B11/08; F15B21/14
Domestic Patent References:
| JP200289516A | ||||
| JP11280701A | ||||
| JP61810U | ||||
| JP2012215016A |
Attorney, Agent or Firm:
Kaichi International Patent Office