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An Optimal Model on Contour of Up-Shifting Tooth for Derailleur System of Bicycle

Published online by Cambridge University Press:  09 November 2016

Y.-Z. Ma  and
S.-J. Chiou
Y.-Z. Ma
Affiliation:
Department of Mechanical EngineeringNational Chung Hsing UniversityTaichung, Taiwan
S.-J. Chiou*
Affiliation:
Department of Mechanical EngineeringNational Chung Hsing UniversityTaichung, Taiwan
*
*Corresponding author (sjchiou@dragon.nchu.edu.tw)
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Abstract

The relative spatial position of each chain link and the phase angle of engaged tooth are not concerned in traditional sprocket designs. As such, the chain shifting might fail regularly. In this study, an optimized path of one chain for up-shifting is derived. Such path is formed by several bended chain links sustain yaw and roll. Empirically, appropriate bending, yaw and torsion angles for tooth chamfer, could be shorten the up-shifting distance and phase angle required, eventually facilitate not only more ascending points compactly arranged on sprocket but larger chain laterodeviation which curtails sprockets clearance and integrates the sprocket unit. Then again, the optimized shifting path promotes efficiency and decreases required movement yielded by derailleur tappet pressure.

Keywords

Up-shiftingDerailleur systemTooth profile
Type
Research Article
Information
Journal of Mechanics , Volume 33 , Issue 6 , December 2017 , pp. 759 - 767
Copyright
Copyright © The Society of Theoretical and Applied Mechanics 2017 

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