本論文探討自行車煞車性能與安全性，分別從直線運動中以自行車車架尺寸分析煞車的影響，與轉彎煞車控制速度時的穩定性，主要方向在於煞車與安全性。自行車的架構平衡只在軸向，而一般騎乘狀況下質心位置略偏後軸，這樣的設計對於煞車動作而言仍有其不足，本文討論在既有架構下的改善方式，並提出自行車煞車理想性能分佈曲線，可同時提高煞車性能與安全性。自行車的穩定騎乘需人車間的配合無間，車體傾斜並配合車把轉動的轉彎運動穩定條件在本論文以理論詮釋，並配合煞車力的施加，巨觀地看煞車行為對迴轉半徑等參數的影響，當中煞車力的施加以理論而言必須根據前、後輪煞車力分佈的概念方能滿足路面的限制。在自行車採用碟式煞車器的趨勢之下，由於其強大的夾持力，煞車的安全性更形重要，故本論文以整車的觀點探討安全性，發現其中又可同時提升煞車性能，提供給煞車器設計者與組裝上作一參考。

This thesis focuses on the safety and performance analyses of disk-brake bicycles riding along straight and curved paths. Braking performance of a bicycle is undoubtedly the most important characteristics that may affect rider’s safety. The braking force mainly results from friction between tires ad road. As the bicycle riding along a curved path is under the exertion of braking force, lateral stability plays a major role for the bicycle’s safety. A simplified three dimensional model is adopted to investigate the dynamics of the bicycle as it is decelerating. It is found that the camber angle of the front wheel and the geometric configuration of the bicycle play a significant role on turning stability during braking. However, the height of the center of mass of the rider and bicycle does not affect bicycle riding stability. In this study criteria for evaluation of braking capability and methods for improvement of braking performance will be discussed.

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