Development of a planetary reduction gear for an in-wheel motor of an electric racing car

Within the student project on the electric car development, a planetary reduction gear for the future in-wheel motor was designed at South Ural State University in accordance with technical specifications. This was preceded by the analysis and layout of the unit, the development of its kinematic scheme, and the derivation of kinematic link equations. The car tractive and dynamic calculation showed that the reduction ratio of this unit matching gear, taking into account the installed electric motor, must be equal to 10. As a result, the teeth number of gear wheels and their geometrical parameters were determined and a 3D model of the planetary reducer was built. The constructive features of the selected synchronous induction motor and all the wheel-hub assembly peculiarities, including weight and dimensions, were taken into account. All the conditions of coaxiality, neighborhood and assembly were fulfilled. In conclusion, the efficiency of the planetary reduction gear for the in-wheel motor being designed was evaluated. At present, the designed reducer assembly drawing and its detailing, as well as documentation release for implementation, are in progress in the student design department of the Automobile and Tractor Faculty. Production of an electric car prototype model is technically challenging task which is planned to be implemented in the autumn of 2019.