交通運輸工具中，車輛所佔比重極高，尤其是供人乘坐汽車的設計，除了必需具備安全舒適的需求之外，也需兼顧到經濟性，自從1973年能源危機以來，油價飆漲各國政府莫不深思，從開源與節流兩方面去解決這個問題，某些替代性能源，雖可減緩一部分能源供應的困窘情形，迄目前為止還是以降低汽車油耗為最有效，而降低油耗的最佳辦法就是輕量化，欲達成輕量化的目標，可從改進材質和變更結構設計著手。組成汽車的零件甚多，其中被廣泛地應用作為扭矩過載的保護裝置，廣義地稱之為過載離合器，然而一般傳統的離合裝置，是由結構體、彈簧、摩擦塊等所組成，其結構複雜且體積龐大，欲達成輕、薄、短、小的目標誠屬不易，目前微小型化產品在日常生活中的應用已隨處可見，且已成必然之趨勢，針對微細元件的開發，必需有適合微小型化的製程的設計，因此簡化扭矩傳遞的離合器結構，減少零件數目，以利於微機電的加工製作。本研究提出四種不同結構，設計輕量小型的過載離合器，將零件數目減少以求減輕重量及加快生產速度，可應用於過負荷保護的場合，譬如汽車的電動窗、自動天線的控制，充分發揮簡易組裝的特色，達到保護的目的，更可進一步地發展微型化。探討各項有關參數改變時，對工件負荷形變與承受扭力的影響分析，並經實際產品驗證可行，且得到了理想的預期結果。

The vehicle is a very important tool for the human movement especially passenger car, its design requirements not only needs comfortable and safety but also considers economic. Since 1973 the energy crisis made a great impact on the world, all governments have attempted to solve this big problem by many ways, some one developed the newly energy like solar cell or fuel cell but the intelligent method is reduce the fuel consumption by lessening the weight of the car. The vehicle structure is very complicate so how to research the new materials and modify the original structure are more efficient to reach that target. The challenge is very difficult within narrow space of the car. Clutches are an old invention but still as common devices for transmitting power in mechanical systems. The general clutch application is to connect two shafts rotating at different speeds and bring the output shaft up to the speed of the input shaft smoothly, and designed to transmit a certain maximum torque like overload protection devices are designed to prevent damage of machinery or production line in the event of an overload, preventing costly repairs and reducing downtime. But all of above traditional designs of the clutch are consists of more components, which are difficult to miniature. So this article is proposed four types simple structure design which can reduce the weight of car and decay assembly time, furthermore, they can minimize the whole mechanism system much easier.

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