本文為設計一種最佳尺度的新型六連桿三截式硬頂敞篷機構，首先於美國專利中搜尋現有的三截式硬頂敞篷機構專利，其中共找出八種專利機構為單自由度機構，並依照機構的運動特性篩選出兩種連桿數較少的機構進行分析探討，以了解敞篷板件配置與機構桿件間的對應關係。後續結合上述兩種專利之優點，以創意性設計方法，找出符合三截式硬頂敞篷機構設計需求之新型六連桿機構，並以閉迴路方程式為基礎推導出新型機構的運動拘束式，結合兩點合成設計方法中的剛體導引方式與函數產生方式應用於新型機構的尺度合成步驟中。最後以虛功原理找出驅動機構所需之扭力，以降低最大扭力為目標函數進行尺度合成最佳化，並且提出一組數值範例來驗證最佳化之結果。

This thesis deals with the structural design and optimal dimensional synthesis of six-bar linkages for tri-fold hardtop convertibles. Firstly, by searching the Unites States patent databases, eight contemporary patents of such mechanisms which are of single degree-of-freedom have been found. Among them, the motions characteristics of the two with lesser number of links are identified and further investigated to find the relationship between the motion trajectories of the roof plates and that of the driving linkage. The kinematic structure of two new types mechanism which combines the advantages of the two existing ones are then synthesized according to creative design methodology. Kinematic constraint equations of these new linkages are derived based on their vector loop closure equations and the combination of two-point rigid body guidance and function generating considerations. A method for computing the driving torque of the mechanism is also developed by using the principle of the virtual work. Finally, an algorithm for synthesizing the optimum dimensions of the mechanisms which gives the minimum driving torque is presented. The effectiveness of the algorithm is verified by a number of numerical examples.

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