後輪多連桿式懸吊之轉向機構設計

Abstract

本研究欲設計一新式後輪轉向機構，以輕巧、簡單、具實用價值為設計目標。首先收集現有文獻、產品與專利並彙整分析其特性，配合本研究之設計目標，發展設計構想，以一種單側單向後輪轉向，及調整多連桿式懸吊下後臂桿件長度之方法來驅使後輪轉向，作為後輪轉向機構設計概念。依據設計概念，估算所需驅動力及功率，設定適當致動器元件規格，並繪製實體模型立體圖。最後運用穩態轉向分析評估本後輪轉向機構之效能，以及發生失效情況時對車輛安全性之影響。本研究所設計的後輪轉向機構能確實達到使車輛增加低速操控靈活性與高速行車穩定性之效果，且符合輕巧、不複雜的設計目標，能提升後輪轉向機構於一般車輛上之可行性。

This study is to design a new rear wheel steering mechanism whose design objectives are: lightness, simplicity and practicability. Firstly, the correlative researches, patents and current products of rear wheel steering are investigated. A practical, simple, light design concept is developed, which is to adjust the under rear arm of multi-link suspension for steering one-side one-way rear wheel. For this concept, the acting force and power required are estimated, and the necessary specifications, drawings and solid models are made. Finally, by steady-state steering analysis, the effects of this rear wheel steering mechanism, including the failure mode, is evaluated. The rear wheel steering mechanism designed in this study, which is light, simple and practical, can actually enhance handling and stability of the vehicles at low and high speed, respectively.