Title:
SLEWING-TYPE HYDRAULIC WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2019/159495
Kind Code:
A1
Abstract:
Provided is a slewing-type hydraulic work machine in which, during a slewing-boom lifting operation, a boom can be driven at preferable speed while slewing torque for starting slewing is ensured. The hydraulic work machine is provided with: boom-lifting working pressure detection units (81, 82, 70) for detecting boom-lifting working pressure; and a capacity control device (70) for controlling a slewing motor capacity during a slewing-boom lifting operation. The capacity control device (70) performs: detection of an actual slewing distribution ratio corresponding value which corresponds to the ratio of energy, of energy of working oil discharged from hydraulic supply devices (11, 12), to be distributed to a slewing motor (14); setting of a boundary value for the actual slewing distribution ratio corresponding value such that, when the boom-lifting working pressure becomes higher, the ratio is further restricted; and capacity control to adjust the slewing motor capacity to a capacity higher than the restriction capacity in a slewing preference allowance time period extending until the actual slewing distribution ratio corresponding value reaches the boundary value during the slewing-boom lifting operation, and to restrict the slewing motor capacity to a capacity equal to or lower than the restriction capacity after the slewing preference allowance time period is ended.
Inventors:
KOZUI MASATOSHI
Application Number:
PCT/JP2018/044191
Publication Date:
August 22, 2019
Filing Date:
November 30, 2018
Export Citation:
Assignee:
KOBELCO CONSTR MACH CO LTD (JP)
International Classes:
E02F9/22; E02F3/43; F15B11/02; F15B11/028; F15B11/16; F15B11/17
Foreign References:
| JPH0727106A | 1995-01-27 | |||
| JPH07190003A | 1995-07-28 | |||
| JP2003206903A | 2003-07-25 | |||
| JPS58153829A | 1983-09-13 | |||
| JPS6255337A | 1987-03-11 |
Other References:
See also references of EP 3722518A4
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (JP)
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