Based on the surface equation of the helical involute pinion, the equation of the face gear was deduced by the theory of gearing and the conditions of nonundercutting and nonpointing were studied.

• 在形成斜齿圆柱齿轮齿面方程的基础上,采用啮合原理推导了面齿轮的齿面方程,讨论了面齿轮根切和齿顶变尖的条件。