Recently, the main industry topics of automobiles have been fuel economy and environmental regulation. In particular, European countries, especially Germany, have imposed restrictions on exhaust gas and the standards have been steadily strengthened. In these cases, electric vehicles are the best alternative to cars that currently use internal combustion engines.
Electric vehicles are equipped with inverters, motors and gearbox instead of engines and transmissions. The gearbox is one of the important components for transmitting power from the electric motor to the wheel. therefore, the design of the gearbox is very important. The gearbox has only one gear ratio, so setting the appropriate gear ratio is very important. However, because there are no standards for design factor other than gear ratios, most engineers only design gears based on their experience. In particular, the gear module and the number of teeth are the main factors of the gear size and profile, but there is no standard.
In order to solve this problem, it is necessary to understand the structural stability through the design factors of the gears.
In this paper, we consider the module and the number of teeth as the main factors. Constraints are the fixed distance between the each axe of the shafts and final gear ratio. In this paper, the main factors are the gear modules and number of teeth. The constraint is the distance of each shaft and the final gear ratio.
In order to predict the structural characteristics, we conducted a structural analysis and compared the maximum equivalent stress according to a change in the gear module and the number of teeth. Based on the structural analysis research, it is considered that structural stability can be effectively presented when designing a gear system.