Title:
WORKING OIL DISTRIBUTING DEVICE IN HYDRAULIC CIRCUIT OF HYDRAULIC SHOVEL OR THE LIKE
Document Type and Number:
Japanese Patent JPS62165003
Kind Code:
A
Abstract:
PURPOSE:To improve operability by decreasing the displacement of a lower- priority oil path switching valve as the displacement of a higher operation priority oil path switching valve is increased, and using the maximum value of an oil path switching valve displacement command signal as a swash plate angle command signal. CONSTITUTION:Operation priority is assigned to oil path switching valves 14a-14d, 15a-15d, 16a-16d. As the displacement of a higher operation priority oil path switching valve is increased, the displacement of a lower priority oil path switching valve is decreased. The maximum value of an oil path switching displacement command signal is used as a swash plate angle command signal for variable-displacement hydraulic pumps 4a-4d. Thus, even if load changes, working fluid is not caused to concentratively flow into a cylinder on low pressure side, so that working fluid corresponding to operating amount can be supplied to each actuator to favorably perform fine operation and interlocking operation.
Inventors:
KUWABARA KOJI
MATOBA NOBUAKI
SAMEJIMA MAKOTO
MIKI MASATOSHI
MATOBA NOBUAKI
SAMEJIMA MAKOTO
MIKI MASATOSHI
Application Number:
JP211586A
Publication Date:
July 21, 1987
Filing Date:
January 10, 1986
Export Citation:
Assignee:
TECH RES ASSOC OPENAIR COAL MI
International Classes:
F15B11/00; E02F3/43; E02F9/20; F15B11/16; F15B11/17; (IPC1-7): E02F3/43; E02F9/20; F15B11/00; F15B11/16
Domestic Patent References:
| JPS566901A | 1981-01-24 | |||
| JPS5754635A | 1982-04-01 | |||
| JPS57201434A | 1982-12-09 |
Attorney, Agent or Firm:
Okamoto Shigefumi