The aim of this study is to design the gearbox of an electric vehicle using the rear-wheel drive. The gearbox is a set of revolving gears and shafts based on programmed torque and rotations per minute (rpm). In this case, safety, strength and durability of gears and shafts was considered. In the narrow vehicle, a light case is used. In addition to gear safety and deflection, the weight of the vehicle was reduced. The electric vehicle reducer gearbox was modeled according to the vehicle room. The strength analysis was conducted using finite element method (FEM). After analyzing the strength using FEM to verify stress distribution, the design was modified, and compared with the results of altered design using FEM. As a result, the reducer gearbox of electric vehicle was designed according to incorporate gear safety, deflection of each gear, durability, and analysis of finite elements followed by test assessment, vehicle installation and the production of real parts.

A differential is a mechanical device that supports smooth driving, by allowing each of the two wheels, to rotate at differential speeds during a turn. This is particularly crucial for tractors, as they mainly work on the ground, often becoming stuck off-highway, or falling into pits. When the tractor wheel is stuck off-highway, it is difficult to get the wheel out, as the differential of the tractor reduces friction between the wheel and the ground surface. In order to prevent this wheel slip situation, the differential locking device, which restricts the two wheels on the axle to the same rotational speed, has been used in the axle of the tractor. In this study, analysis models of the hydraulic system and the dog clutch were developed to predict the performance of the differential locking device. Using the LMS imagine. AMEsim software, the analysis models were verified by comparing the simulation results with the experimental data. Using the models developed, the influence of the release time of the differential locking device on selected design parameters was analyzed, to determine the effect on the release time of the differential locking device. As a result, design values that will improve the performance of the differential locking device were derived.