Title:
SLEWING WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2014/002368
Kind Code:
A1
Abstract:
Provided is a slewing work machine comprising: a lower travel body; an upper slewing body; a hydraulic motor; a slew electric motor; a hydraulic pump; a slewing operation apparatus; a control valve; a brake valve; a communicating valve which switches between an open location, which allows a motor exit-side tube to bypass the control valve and be directly in communication with either a tank or a motor entry-side tube, and a closed location, which blocks off said communication; and a control device which issues a communication valve switch instruction and a torque instruction for the slew electric motor. The control device: (i) derives, as a target value, from an operation state of the slewing operation apparatus and a slewing state of the upper slewing body, either a pressure which arises with the hydraulic motor when the communicating valve is not present, or a torque which is obtained from this pressure; (ii) derives, as an actual value, a pressure which actually arises with the hydraulic motor, or a torque which is obtained from this pressure; and (iii) outputs the torque instruction on the basis of a value which results when the actual value is subtracted from the target value.
Inventors:
KOMIYAMA MASAYUKI
Application Number:
PCT/JP2013/003212
Publication Date:
January 03, 2014
Filing Date:
May 21, 2013
Export Citation:
Assignee:
KOBELCO CONSTR MACH CO LTD (JP)
International Classes:
E02F9/22; E02F9/20
Foreign References:
| JP2012082643A | 2012-04-26 | |||
| JP2003106305A | 2003-04-09 | |||
| JP2010065510A | 2010-03-25 |
Other References:
See also references of EP 2865813A4
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (JP)
Etsuji Kotani (JP)
Etsuji Kotani (JP)
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