Analyse And Research Of The Hydraulic Motor Controlled By Pump

The system of hydraulic motor controlled by pump used for vehicle transmission system. When the vehicle drived or changed by the lode of work, the hydraulic transmission system can pledge the character of transmission get or get near the ideal eternal power adjustment, and change exactly as one pleases the speed of the vehicle, include the speed is zero or negative number. So the system of hydraulic motor controlled by pump used for light or middle and heavy vehicle. And the system of hydraulic motor controlled by pump has great vista in the other area of engineering project. Near the ten years, the hydraulic system get a great progress in the applying of mobile machine. The excavator, road surface machine and wheel loader, road grader and bulldozer using extensively the technology of hydraulic system Because the great progress of the technology of hydraulic system and the best design and exactly manufacture of hydraulic component, the capacity of power (pressure, speed), weight, transmission efficiency, life get a high level and very cheap. Those progresses change the point of view of slowly unreliable, expensive, and have such as many advantage: 1. small, light and when transmit the same power and speed, the weight of hydraulic motor is a small part of electric machinery. 2. have a great range of speed changing. 3. haven't overload the ability of tow is better in low speed. 4. it is active the design and install of pump and motor. 5. inertia turning round is small, the speed of reacting is faster. But the hydraulic system is a weak point in the mobile, because: 1. engine, pump, motor, walking machinery compose a whole system, not only by the component, but also the mate of the component, based the lift and cost. 2.engine, pump, motor, walking machinery are complex. In order to get a best result, should be controlled them synthetize and the method of the research is not perfect. 3.the use of very component in the construction machinery is a new rear. So, the hydraulic transmission is better than the machinery transmission. This technology has a great foreground. This article is based on three sides: hydraulic component, the technology of adjustment and the apply of machinery 1. The progress of hydraulic component in the system of hydraulic motor controlled by pump: a. Using the new material, new process, simply the structure of component, reduce the cost, raise the rate of efficiency, When raising the amount of component. The method by setting complex pressure balance system and complex release component is not popular. b. The highest pressure of heavy series component has get about 42MPa～50MPa, but the permitted pressure is raising, such as from 25MPa to 35MPa, The function of middle series component will get the level heavy series, And the light series keep cheap and general. c. To raise the rate of power and efficiency, reduce the noise of component, to be satisfied the need of customer. d. By the electronic and hydraulic, more and more vary flow function achieved by electronic. e. Integrated component became more and more. 2. The development of adjustment technology For a whole system of hydraulic motor controlled by pump, not only the pump, motor and valve is needed, but also the suitable between them, specially in the side of expanding the high efficiency of the system, the highest value of most hydraulic component is getting to satiate, the meaning of the development of adjustment technology is becoming more and more important. 3. The development of adjustment technology of the system of hydraulic motor controlled by pump The application of the system of hydraulic motor controlled by pump in the mobile has a great development because it is becoming mature in the near 20 years.Although the competition from electronic transmission is becoming greater, but the area of the system of hydraulic motor controlled by pump will become more and more important, specially on vehicle, and the cost of electronic component is cheaper, the combination of the technology of electric and the technology of hydraulic will get a great revolution in the area of hydraulic driving technology.