液壓系統具有輸出力量大、出力調整容易、耐久性高……等優點，被業界廣泛使用；液壓幫浦猶如液壓系統的心臟，為能量轉換裝置，將輸入的機械能轉成液體的液壓能，為液壓裝置的動力來源。液壓幫浦種類繁多，由於軸向柱塞幫浦(活塞幫浦)的高輸出壓力、高效率與高控制性，故自動化機械、工具機、特殊車輛的液壓源，都是採用軸向柱塞幫浦。然而市面上的軸向柱塞幫浦大多存在流量脈動過大、高噪音的問題，且使用效率仍有改善空間。
本論文主要研究為新型雙斜盤柱塞幫浦之設計與開發，首先透過文獻搜索與資料瀏覽進行初步的幫浦設計，使用Plunger與Pot搭配自製夾具，放置於MTS材料拉伸試驗機進行公差實驗，量測其密封效果與液壓油的溢漏情況；利用有限元素分析軟體ANSYS進行模擬，針對柱塞幫浦的關鍵零件—Piston與Cylinder的幾何結構進行改善，並使用Cavity Design進行無活塞環的Piston設計，並將上述的實驗與模擬結果作為設計柱塞幫浦之參考，進行新型雙斜盤柱塞幫浦之開發，並設計雙邊流量調整控制機構。
公差實驗的結果顯示，當Plunger與Pot的間隙為5~6 microns，在25 MPa的負載下其溢漏量為1.064 cm3/min。Cylinder之模擬結果顯示由於Uni-body的結構關係，其孔洞受壓變形後不為真圓，易導致球形柱塞的變形與破壞，故採用Single Cylinder結構進行改良。Cavity Design之模擬結果顯示，Piston材料選用SCM440，Single Cylinder材料選用鋁青銅，當Piston的孔洞尺寸為半徑5 mm、深度7 mm，Single Cylinder的厚度為3 mm，兩者的徑向變形趨勢幾近吻合，可作為無活塞環的Piston設計與加工依據。
新型雙斜盤柱塞幫浦透過雙向對稱結構來平衡雙邊結構，降低流量的脈動，並降低幫浦的噪音，且轉子結構的輕量化設計，降低了幫浦的轉動慣量，透過無活塞環設計降低摩擦力，進而提升幫浦的使用效率。

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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