Title:
SLEWING HYDRAULIC WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2019/142481
Kind Code:
A1
Abstract:
Provided is a slewing hydraulic work machine capable of high efficiency slewing boom lifting work. A hydraulic work machine comprises an upper slewing body, a work device including a boom, a hydraulic pump (31), a variable capacity slewing motor (25), a slewing control device (35, 45) to control slewing by receiving a slewing command operation, a boom cylinder (26), a boom control device (37, 46) to control boom lifting by receiving a boom lifting command operation, a boom angle detector (68), and a capacity control unit (50). The capacity control unit (50) calculates command motor capacity on the basis of the boom angle, generates a capacity command signal corresponding to the command motor capacity, and inputs the signal to the slewing motor (25). During a slewing boom lifting operation, the capacity control unit (50) sets the command motor capacity to a capacity that is no greater than a reference capacity when the boom angle is not greater than a slewing priority angle and sets the command motor capacity to a capacity that is greater than the reference capacity when the boom angle is greater than the slewing priority angle.
Inventors:
UEDA KOJI
Application Number:
PCT/JP2018/042477
Publication Date:
July 25, 2019
Filing Date:
November 16, 2018
Export Citation:
Assignee:
KOBELCO CONSTR MACH CO LTD (JP)
International Classes:
F15B11/02; E02F9/22
Domestic Patent References:
| WO2017051483A1 | 2017-03-30 | |||
| WO2017131189A1 | 2017-08-03 | |||
| WO1988002822A1 | 1988-04-21 |
Foreign References:
| JPH08311934A | 1996-11-26 | |||
| JPS6255337A | 1987-03-11 |
Other References:
See also references of EP 3719222A4
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (JP)
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