| Summary: | 碩士 === 國立成功大學 === 工程科學系碩博士班 === 101 === Hydraulic system which is widely used by industry has plenty of advantages, including output with large power, high durability, and easy to adjust force…etc. Automated machinery, machine tools, special vehicles equip axial piston pump as a hydraulic source, because the axial piston pump’s properties offer high output pressure, high efficiency and high controlling. However, most of the axial piston pumps in the market have some problems of high flow pulsations and serious noise. There is still room for improving efficiency.
The research focuses on the design of a double inline piston pump. First of all, search the literatures to design the original pump. Secondly, use Material Testing System (MTS) and self-made fixtures to conduct the tolerance test, measuring leakage via the sealing of plunger and pot. Third, Improve the piston and cylinder by using finite element analysis software ANSYS, and then design the piston without ring by means of cavity. Both the results of experiment and simulation can be referred to design the axial piston pump.Finally, develop the double inline piston pump and design adjustment mechanism of double structure.
The results of tolerance test showed when the clearance was 5~6 microns and the leakage was 1.064 cm3/min under a load of 25 MPa. The simulation result of cylinder displayed that owing to the structure of uni-body cylinder, the cylindricity of the hole is not accurately round when it was under pressure. Use single cylinder design could avoid elliptic deviation, and it also achieves the goal of lightweight design. The optimum design of cavity is that choosing SCM440 to manufacture piston with cavity of radius of 5 mm and depth of 7 mm, and that choosing aluminum bronze for single cylinder which thickness of 3 mm. The results of cavity design could be useful criteria to manufacture the piston without ring.
Double inline piston pump balances the bilateral construction, reduces the flow pulsations and decreases the pump noise by means of symmetrical structure. Lightweight design of rotary parts reduce the moment of inertia of the pump. Piston without ring decreases the friction and increases efficiency of the pump.
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