| 摘要 |
PURPOSE:To improve the stability, easiness, and dependability of control by constructing a control device consisting of a confluence circuit and a controller for supplying control signals to the confluence circuit. CONSTITUTION:A confluence circuit 2 is constructed by connecting the delivery sides of plural proportional electromagnetic pressure flow control type variable- displacement pumps 4, 5 to each other, via check valves 6, 7. Further, a controller 3 is also connected to the plural proportional electromagnetic pressure flow control type variable-displacement pumps 4, 5. In a control region where the pressurized oil supply to a actuator 8 is above a fixed flow rate, the controller gives flow control signals to all the pumps 4, 5 and in a control region where the pressurized oil supply to the actuator is below the fixed flow rate, the controller provides a flow control signal to only one pump 4 and stops the other pump 5. Thus, switching of the pumps 4, 5 is carried out smoothly, and no pressure shock is generated, stable control being achieved. And the easiness and dependability of control are improved as the number of components can be greatly reduced. |
