本研究係關於連桿型四輪轉向之機構設計,此設計主要適用於電動代步車之轉向系統,使低速移動的電動代步車在轉彎時,能減少其迴轉半徑,以減少轉彎時所需的空間,且沿著所預設之中心點作旋轉運動,即符合阿克曼原理(Ackerman Principle),以確保電動車轉向時之安全性、操控性與舒適性。本研究將四輪轉向系統分成三個部份設計,前輪轉向機構、後輪轉向機構及核心機構,前輪及後輪轉向機構均採用瓦特二型(Watt-Ⅱ)六連桿組,以解析尺寸合成法設計車輛轉向機構,將前輪及後輪之中心臂設計為轉動幅度相同,再由一組平行四邊形四連桿組為核心機構連接前後中心臂,以達到符合阿克曼原理(Ackerman Principle)四輪轉動之目的。
This research deals with the mechanism design of a four-wheel steering system which is link-type. It is used in the electric scooter. Its main purpose decrease rotation radius and space when the electric scooter moves at low speed, and moves around a designate point. It conforms to Ackerman Principle, and possessed of safety, maneuverability, and comfort. This research designs front steering system, rear steering system dividedly, and inner system. It employs analytical dimensional-synthesis technique to design electric scooter steering system and Watt-II six-bar-linkage both front steering mechanism and rear steering mechanism. The inner system is four-bar-linkage which is parallelogram to link front steering system and rear steering system. This research arrives at four wheels steering system of electric scooter finally.