Title:
WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2017/110167
Kind Code:
A1
Abstract:
The present invention can achieve energy conservation by carrying out recycle control even when an abnormality occurs in a pressure sensor of a hydraulic actuator. The present invention is provided with: a hydraulic pump (41b) that supplies pressure oil to a second hydraulic actuator (34); a recycle circuit (47) that recycles return oil from a first hydraulic actuator (32) between the second hydraulic actuator (34) and the hydraulic pump (41b); a discharge circuit (46) that discharges the return oil from the first hydraulic actuator (32) into a tank; a recycle amount adjusting apparatus (45) that adjusts the ratio of the flowrate of the return oil flowing through the recycle circuit (47) and the discharge circuit (46); a controller (100) that controls the recycle amount adjusting apparatus (45); a first operation amount detector (53a) that detects an operation amount of a first operation apparatus (51); and a first hydraulic actuator speed calculation unit (111) that calculates the speed of the first hydraulic actuator (32), wherein the controller (100) controls the recycle amount adjusting apparatus on the basis of the operation amount detected by the first operation amount detector (53a) and the speed calculated by the first hydraulic actuator speed calculation unit (111).
Inventors:
IMURA SHINYA (JP)
HIJIKATA SEIJI (JP)
HIJIKATA SEIJI (JP)
Application Number:
PCT/JP2016/077244
Publication Date:
June 29, 2017
Filing Date:
September 15, 2016
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
F15B21/14; E02F9/22; F15B11/024; F15B20/00
Foreign References:
| JP2008089023A | 2008-04-17 | |||
| JP2015190518A | 2015-11-02 | |||
| JP2016075302A | 2016-05-12 |
Other References:
See also references of EP 3396176A4
Attorney, Agent or Firm:
KAICHI IP (JP)
Download PDF: