A methodology has been developed for creating a fundamentally new high-speed planetary gearbox for an electric vehicle drive with double-crown planetary gears mounted in central bearing supports mounted on the periphery of a three-lobed flange integral with the planet carrier. Functional relationships have been established that enable the determination of rational parameters for a high-speed gearbox with improved dynamic performance. The use of alloyed materials for gears, whose performance criterion is contact strength, with high mechanical properties has enabled significant material savings, reduced weight and dimensions, and improved the technical and economic performance of the electric vehicle gearbox. The selection of gear material is based on loading conditions and cost effectiveness. The developed planetary gearbox has a simpler design, smaller dimensions and weight, increased efficiency, and improved speed and power characteristics compared to similar products.
Zagirnyak et al. (Sat,) studied this question.