Study on the Maximum Contact Stress of Involute Gear Pair with a Small Number of Teeth

As the traditional calculation formula for contact strength of involute gear pair is not applicable for the calculation of those with small number of the teeth, some researches on the calculation of contact strength of involute gear pairs have been done. The calculation of the contact ratio of involute gear pair with a small number of teeth can confirm that its end face engagement must be of single-tooth mesh, while the research on the actual contacting lines in the meshing zone can find out the precalculated position, computational formula, and strength condition of the maximum contact stress according with the gear pairs with a small number of teeth.