- 學位論文
曲槽日內瓦輪之設計與實作
Design and Manufacture of Geneva Mechanisms With Curved Slots
摘要
曲槽日內瓦機構可以被視為一種倒置凸輪機構，相較於傳統日內瓦機構在滾子進入滑槽的起點與終點會產生加速度不連續的現象，而將傳統從動輪上直線滑槽設計為曲線滑槽，使得曲槽日內瓦機構有著較好的動態特性。利用簡單且有系統的包絡線理論來計算出日內瓦機構曲槽的幾何輪廓方程式，此種方法能將從動輪上的曲槽曲線以解析的數學式來表達從動件欲輸出的運動。除此之外，為了方便設計與製造的過程，必須考慮曲槽曲線上的過切與雙重點發生情況，繪製以主動件轉角相對應發生過切與雙重點之偏置量圖表，以此當做日後設計的參考。最後，以模擬實例證明設計理論的可行性，並呈現製造出的實體機構模型。
並列摘要
Geneva mechanisms with curved slots can be regarded as an inverse cam mechanism. It has better dynamic characteristics than the conventional Geneva mechanism. A concise and systematic procedure using the theory of envelope to determine the geometry of Geneva mechanisms with curved slots is presented. Given the desired motion of wheel, the method enables the curved slots on wheel to be generated in an analytical expression. In addition, to assist design and manufacturing process, the undercutting condition as well as double-point in the curve is investigated. The design charts free of undercutting and double point are also plotted based on the input driving angle and offset angle. Finally, a mock-up is built to demonstrate the feasibility and availability of the design theory.