Effect of Load Distribution along Facewidth on Tooth-Root Stress

The paper deals with the effect of non-uniform load distribution along spur tooth facewidth, upon a tooth-root stress field of thin-rimmed gear. The different linear load distribution, from constant load to triangular shape, is simulated by the boundary conditions imposed to the developed 3D FEM single gear models. The combined influence of a gear rim thickness and the facewidth upon the tooth-root stress distribution is investigated. Based upon the established tooth-root stress distribution of thin-rimmed gear, the ratio between maximum tooth-root stress for certain load distribution, and mean tooth-root stress along the facewidth for constant load distribution, is estimated. This ratio corresponds to the face load factor of the standard ISO, proposed for the gears with a minimum rim thickness of sR>3, 5m.