Conversion Model for the Design of Steel and Polymer S-Gears

The existing models for the conversion and design of polymer gears are only valid for involute gears. This research was focused on S-gears, a specific type of gear profile which has more favorable contact conditions and greater root thickness when compared to involute gears. S-gears design is currently based on tests, experience, and the use of numerical simulations. Due to the lack of a simple calculation model for designing S-gears, there is a limited number of applications in practice. The goal was to set up a model for the evaluation of the root and flank load-carrying capacity of polymer S-gears. The VDI 2736 guideline was taken as the basis of our conversion model for polymer S-gears. With the introduction of new factors for the calculation of root and flank stress, the VDI 2736 model was upgraded to take into account the specific shape of the S-gear profile. In addition, a model for designing steel S-gears was set up.