The Design, Modeling And Simulation Of Three Outlets Variable Axial Piston Pump

According to the different hydraulic control components,hydraulic control technology include two kinds of valve and pump control. Valve technology has the advantage of fast dynamic response, use of public constant pressure oil source can be controlled in different implementation of the components, but the control at loss energy, leaking, and fever are quite serious. Pump-control technology, the outstanding advantage is energy-saving, through the electro-hydraulic servo valve ,controlling the the parameters of hydraulic pump displacement, or by motor controlling the speed of the pump to achieve the changes in pump flow rat,at last to achieve the effect of the hydraulic pump directly involved in the control of hydraulic drive system. After 20 years of effort, the direct pump-control technology has made great progress , developing a high proportion of the dynamic response and servo pump, introducing variable speed control technology, symmetric cylinder pump control technology has been relatively mature. But the technology in the pump control differential cylinder is not very ideal, the reason was mainly due to input and output flow asymmetry in two-port of differential cylinder, resulting in when pump control differential cylinder , fill pump or hydraulic valve should be introduced to compensate or exchange the surplus flow, such an approach has the problem of high cost, low efficiency, can not fully reflect the pump-controlled energy-saving advantage. The most direct way to solve this problem is to start from the hydraulic pump.For piston pumps can reach high working pressure and rotate speed, vary the displacement easily,have compact structure and high power density.They are one of the widely used power components in hydraulic system.They are employed in a lot of fields,from large hydraulic machines weighing more than one million ton to small hydraulic clamps,from ordinary machines fastened to the floor to mobile vehicles,from civil machinery to military weapons.Hydraulic components are mostly mature.However,many engineers and researchers are trying their best to improve the working life and perfommce of piston pumps all the time,especially the axial piston pump.This article is from the axial piston pump to start, according to the new distribution flow theory, design multiple system of three oil port variable axial piston pump to achieve a single pump directly control the differential cylinder and do not introduce other hydraulic components or control components,not only simplify the structure of the hydraulic system, but also fully embodies the advantages of pump-controlled in energy-saving.The main content of the article is: 1. According to the new assignment principle, consider the problem that needs attention when designing hydraulic pump, using Pro/E software,establish the virtual prototype model of three oil port axial piston pump.2. By the kinematics and mechanical analysis obout multiple system of three oil port variable axial piston pump,referencing piston kinematics and mechanical design requirements and the actual operating features of piston pump,determine the relevant structural dimensions of pump's each component.3. Using AMEsim simulation software,established the simulation model of multiple system of three oil port variable axial piston pump. Analysed the impact of piston pump's flow on the angle of three window-type of symmetrical damping trough across the valve plate, and also given simulation results.Meanwhile,analysed swashplate angle changes and the piston flow characteristics under the control of variable displacement obout multiple system of three oil port variable axial piston pump.According to the simulation results,analysed the practical feasibility of the three oil port axial piston pump.4.According to the structural characteristic of parallel three oil port axial piston pump, design hydraulic loop system based on new pump and do brief.