According to relations betqeenminimal oil-filmthickmessand tooth-face roughness in elastohydrodynamic lubrication theory,calculation fomula is presented and acual calulation os cattied out.

• 此法克服了经验选油法的局限性，将齿轮润滑油粘度的选择提到理论高度并可直接算出具体数值。