自行車內變速系統之可靠度研究
Date Issued
2004
Date
2004
Author(s)
闕延洲
DOI
zh-TW
Abstract
Mechanics and reliability related issues of the multi-speed hub system of a bicycle are studied in the present thesis. First, failure mode and effect analysis (FMEA) is carried out to find possible failure modes of each component of the system, and identify the key component that is vulnerable to failure. Finite element analysis is then performed to find the maximum stress of the key component. The expected life and reliability of the component are evaluated based on a wear model. Finally, reliability allocation is performed to find an optimal selection of each component of the system in view of its individual cost and reliability. The result shows that an elastic shifter is the key component of the multi-speed hub system. Its maximum stress is 1.08 times of the material’s yield strength. If wear is considered, the reliability degradation of the shifter with respect to its usage cycle is found, and it has a mean life of 17,520 cycles. Finally, it is demonstrated that appropriate reliability can be allocated to each component of the hub system to obtain a minimum cost design while maintaining the required system reliability.
Subjects
內變速器
有限元素法
可靠度
失效模式與影響性分析
旋轉變速握把
自行車
multi-speed hub
failure mode effect analysis (FMEA)
elastic shifter
finite element method
bicycle
reliability
Type
thesis