With computer aided analysis the geometric features of internal gear hob are proved, which cutting edges are symmetral about datum axis,even along pitch circle of pinion,fitting in with involute.

• 通过电算分析，证明内齿轮滚刀切削刃具有关于基准轴的对称性、沿媒介齿轮节圆的分布均匀性、对渐开线的可拟合性等几何特征。