设计小模数及中模数偏下齿轮滚刀齿顶齿形时,我们通常是以模数乘常数的方法给定其齿顶曲率半径R1(图1c和d)。但是由于产品性能及其结构设计需要,对齿轮槽形提出如图1a和b两种形式曲率半径r的尺寸要求时,就不能简单的按齿轮模数关系给定滚刀齿顶曲率半径R1,因为齿轮根处的曲率是 When designing the small module and the middle module gear tooth profile of the lower hob, we usually give the radius of curvature R1 of the addendum by means of modulus multiplication (Figure 1c and d). However, due to the performance of the product and its structural design, when the size of gear groove is given as shown in Figure 1a and b, the radius of curvature r can not be given simply by the relation of gear modulus, Because the gear at the root of the curvature is