| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 104 === The purpose of this study was to develop a design approach of two-speed helical gear train system and to find out the suitable selection method of bearings which could fit the available bearing catalog. In this study, first, the total weight of gear train was optimized by genetic algorithm. According to the design requirement and structural features constraints, the mathematical model of optimization which took the basic design variables and total weight loss as the objective function was established. The branch and bound method was also applied to set up for the design processes of choosing integer number of teeth, satisfying the hunting ratio and fitting the bearing selection properly. Second, with altering the different gear train configuration settings, the better design could be determined as a conclusion. Further, each variable would be examined in sensitivity. Accordingly, the conclusion could provide the designer to make trade-offs based on the design process. By developing a complete design of lightweight optimization, the study findings may serve as development and further research of the vehicle transmission system.
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