先前本團隊已實際製作幾輛可內傾三輪車，但仍不盡完美，側傾的轍變化使車輛在低速下無法回正車身，降低車輛操控性，且前代三輪車輛和二輪機車的操控性仍然有所差距，改善轍問題和其操控性為本研究之目標。

本文旨在改良第二代2F/1R抗翻覆之三輪車輛，並利用機構模擬軟體Pro ENGINEER wildfire 3進行機構設計，減少不必要的錯誤嘗試及加工時間，並參考模擬結果選擇適當的尺寸，以證實新設計能有效改善其缺點。

本研究改善第二代2F/1R可內傾三輪車輛之性能，將原本的擺臂機構更改為四連桿機構，徹底消除第二代車輛在側傾時的轍寬變化問題，使側傾轉向時更順暢，並改善第二代車輛的轉向比問題，提升駕駛者在緊急閃避時的反應速度，經實際試乘後，發現其操控性與安全性大幅的提升，騎乘者可依所需的向心力大小來控制內傾角度，能順暢的通過彎道且不會有向外翻覆的感受。

Prior team which research tilting three wheeled vehicle already have several prototypes. But it not perfectly. When vehicle tilting on a slow speed. On this state ,tread of vehicle will be change. It cause driver cannot go back perpendicular state, and decrease control performance. Also second generation of vehicle cannot tilt at turns like a two wheeler, hence raise the danger of rolling over. This research will improve the tread of vehicle problem and raise vehicle control performance.

The objective of this research is to improve upon the second generation of tilting three wheeled vehicle. This research takes full advantage of the Pro ENGINEER Wildfire 3.0 on design of the vechicle. Reduce of testing with actual materials has consumed a great deal of time and budget. From the simulation results, the mechanic parts can be repeatedly modified with ease. Only after the entire structure can meet the demands of the design, the actual work of assembly and test ride is taken place to physically verified the new design.

In order to improve tread of vehicle problem. We change original swing-linkage to four-bar linkage. And improve second 2F/1R vehicle’s steering ratio problem. The test ride reveals the safety and controllability of the vehicle is greatly enhanced. The driver can control the tilting angle with ease, and turn or dodge obstacles entirely without concerns of rollover.

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