| 摘要 |
PURPOSE:To keep the total horsepower absorbed by individual oil hydraulic pumps constant invariably by increasing or decreasing the discharge force of other oil hydraulic pumps so that the predetermined output horsepower of a prime mover is absorbed by individual oil hydraulic pumps. CONSTITUTION:Oil hydraulic pumps 3, 5 suck working oil from an oil tank 7. The pump control 4b of the oil hydraulic pump 3 has a function to move the operating point of the oil hydraulic pump 3 on a line with a constant discharge pressure when receiving the input signal pressure nearly proportional to operator's manipulations. Pump controls 6b of the oil hydraulic pumps 5 decrease the horsepower absorbed by the oil hydraulic pumps 5 when the torque signal pressure from a pump torque signal generator 8 is high, and increase said horsepower when the signal pressure is low, thereby the predetermined output horsepower of a prime mover 1 can be absorbed effectively by all oil hydraulic pumps, thus the total horsepower absorbed by the oil hydraulic pumps can be kept constant invariably. |
