소형 전기자동차용 감속기 설계

Abstract

In recent times, fuel economy enhancement and environmental regulation compliance have become the maintopics of interest in the automobile industry. Electric vehicles are desirable alternatives to the existing carsthat employ internal combustion engines. Specifically, electric vehicles are equipped with inverters, motors,and a gearbox instead of engines and transmission mechanisms. The gearbox is a key component, used totransmit power from the electric motor to the wheel. Therefore, the design of the gearbox is critical. However, most engineers design gears based only on their experience because no standards pertaining to thedesign factor exist, other than those for the gear ratios. To overcome this problem, the structural stabilitiesmust be examined considering the design factors of the gears. In this study, we considered the module andnumber of teeth as the main factors. The constraints corresponded to the final gear ratio and fixed distancebetween each axle of the shafts. Moreover, a structural analysis was conducted, and the variation trend of themaximum equivalent stress against changes in the gear module and number of teeth was examined. Byperforming such an analysis, the structural stability in the design of a gear system could be effectivelyinvestigated.