Design optimization of high ratio planetary systems

Abstract

The study deals with the optimization of the rim thickness of the ring of a high-ratio planetary system with straight gears. In order to reduce the weight and to increase the maximum transmittable torque a new design strategy is applied. The geometry of the gears was generated using a numerical procedure which takes into account the geometrically correct form of the flank. The mesh on the active flanks, as well as in the area of the tooth foot was fine, allowing the accurate calculation of both flank pressure and foot stress. The model also included the support conditions between the ring gear and the housing. Improved solutions were found.