A new structure of the transmission system of BIVIS is designed, and the design idea of using the double circular tooth gear in transmission system of BIVIS is proposed.

Through the calculation of the finite element method(FEM) models for double circular arc profile spiral bevel gear, the stress changing pattern along the length of the tooth is obtained.

A formula is given to calculate the stress in tooth middle of GB12759-91 double circular-arc gear via regression analysis in this paper.