The combined mesh stiffness of spiral bevel gears is one important factor for dynamic analysis. The total deflection on
the contact line of a tooth pair is composed of bending, shear and tooth contact deflections. The bending and shear
deflections on the contact line of the gear tooth are evaluated by the finite element method with isoparametric shell
elements, and the tooth contact deflections are evaluated using Hertzian contact theory. Based on these deflections, the
stiffness is obtained using the so called flexibility method, and then the combined mesh siffness is obtained by applying
the contact and load sharing ratios.

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