自行車前變速器之分析與設計

Abstract

作用在於撥動鏈條，使鏈條與所選擇之大齒盤齒片囓 功能。由於自行車 前變速器安裝在大齒盤與座管之間 @用在鏈條的緊邊，須要較大的操作力 ，所以自行車前變速 ぞ攭吨峓x難性。一般而言前變速器對不同車架不易 相容， t商對自行車前變速器的設計法則了解相當有限。因此，本 M下列 問題：首先研究一套自行車前變速器的設計法則，同時改善同一自行車前 變速器對不同車架的相容性以及減輕撥桿操作力。 萓璅悍e變速器的分析 與設計的方法，如根據車架及齒 悍e變速器的位移分析、靜力分析、敏感 度分析、應力分析， ]計、撥鏈板運動區間設計等。此外，本文也提出一 項新型 輪，用以取代傳統的鋼索連接桿，以控制鋼索拉力變化，以減輕 換檔時的操作力。 A front derailleur on bicycle is designed to shift the chain to with the desired sprocket of the chainwheel. There are many considerations on the front derailleur because it is installed in limited space between the seat tube and the chainwheel. It works tight side of the chain so its shift effort is larger. More, the of the commercial front derailleur with the different frame is However, the local manufacturers have few design rules on thers. The objects of this study are to develop design rules of ther, improve the compatibility of the front derailleur with theand This study presents a procedure of analyses and designs for the derailleurs. The data of the frame and the sprockets can be used displacement analysis, static analysis, sensitivity analysis,, plate design and plate motion range design. Further, this study design-cable joined cam to instead the conventional cable joined joined cam makes the better control of the alteration of themake the shift lighter.