Modular Gear Transmission Model for Analyzing Production Tolerances in Electric Drivetrains

摘要

Manufacturing tolerances can have noticeable impacts on the operating behavior of an end product. In the field of electric automotive drivetrains, the mechanical transmission is an essential part that is affected by tolerances. This work presents an approach to model gear transmissions via modular components for dynamics analyses considering tolerances. The model structure consists of components which represent gearwheels, carriers, bearing dynamics and gear mesh dynamics. For simulations, a planetary gear transmission model is established which includes time-varying gear mesh stiffnesses based on meshing geometry. Both an exclusively mechanical simulation with an ideal rotational motion source and electromechanical simulations using a model of a voltage/frequency-controlled electrical machine are performed. The model approach is validated with help of the resulting rotational motion curves, bearing forces and frequency spectra of gear mesh forces, input torque at sun gearwheel side and electrical current. In this context, plausibility of the results is assessed by comparison with existing literature.