円筒歯車の曲げ負荷能力の向上に関する研究(第1報, 左右非対称歯形の採用による歯元応力及び剛性の変化)

This study is to develop a new method to enhance the bending capacity of gear tooth by the use of asymmetric tooth profile. Considering that many power transmission devices operate in one direction, where only one tooth surface （the front of tooth） is practically used. Therefore, it is not necessary to make tooth profile symmetrically, the back profile of tooth, which does not mesh in operation, can be designed to decrease tooth root stress. Different standard pressure angles are used to the front and back tooth profiles. Finite element method was used to calculate the tooth root stress and the bending stiffness of the asymmetrical tooth in several standard pressure angle combinations. Based on the results of calculations, it is clarified that tooth root stress decreases and bending stiffness increases remarkably by the use of a large standard pressure angle in the back profile of tooth, but no clear change in load sharing ratio appears during meshing period