Fillet radius of spur gear formula9/16/2023 ![]() The maximum tool tip radius will vary with the pressure angle changing due to the geometrical relationship of basic rack. Because the critical section occurs in the gear root fillet, the root fillet radius largely affected by tool (hob) tip radius also has a great significance for improving the bending strength. Gear pressure angle is an important parameter affecting tooth bending stress. It is imperative to understand the effect of gear parameters on bending stress in the initial stage of designing gears. With increasing demand for high power density gear applications, the need to optimize gears for minimum stress becomes increasingly important. Many efforts have been made to increase gear bending strength including improving gear material property. ![]() Tooth breakage will end the gear life, so gear bending stress has to be accurately calculated for reliable operation. Tooth breakage from excessive bending stress and surface pitting from excessive contact stress are the two primary fatigue failure modes for gears. ![]()
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