| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 100 === The scooter has many advantages such as easy to ride, low cost and can be operated under various traffic conditions. It is not only a major product for the motorcycle manufacturers but also a useful transportation tool for people living in densely populated countries such as Taiwan. How to improve a scooter’s quality and performance and lower its cost has been a challengeable task for scooter manufactures. The purpose of the present thesis is to carry out a reliability study of the scooter’s disk-brake system that is considered one of the key components of a scooter. In the study, failure mode effect analysis (FMEA) is first used to identify possible failure modes of the disk-brake system and its subsystems. Their effects on the disk brake system are evaluated as well. Aside from the qualitative evaluation, a quantitative analysis is also performed to appropriately allocate the components’ failure rates while maintaining the required manufacturing cost and system reliability. Since wear of the brake-pad is firstly identified to be the most serious problem of the disk-brake system, five types of brake-pad made of different percentages of borosilicate glass matrix, SiC fiber and C fiber are chosen to be studied in detail. Reliability tests are carried out for these brake-pads and the cost of brake-pads is also considered. It is found that brake-pad made of 50% of borosilicate glass matrix and 50% of fiber is the best choice among all. It is also found and recommended that, for this type of brake-pads, it had better be replaced with a new one every 21,900 km to guarantee a 99%-reliability and insure the riders’ safety.
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