理想的圆弧锥齿轮(以下简称齿轮),它的端面模数从齿轮的大端至小端是按比例减小的。其齿厚也是按比例减小。这种收缩齿型称为“正常收缩”齿。但是在切削加工中,由于切削方法或铣刀盘直径选择不当。可能产生齿轮大端与小端齿厚比例失调,甚至出现小端齿厚大于大端齿厚(反向收缩)齿型。这样齿轮在使用过中,其承载能力将会受到影响。 Ideal arc bevel gear (hereinafter referred to as the gear), its end modulus from the big end of the gear to the small end is proportionally reduced. Its tooth thickness is also reduced proportionally. This contraction type is called “normal contraction” tooth. However, in the cutting process, due to the cutting method or cutter diameter choice improper. It may cause gear tooth ratio imbalance between the big end and the small end, and even the small end tooth thickness is larger than the big end tooth thickness (reverse contraction). Such gear in use, its carrying capacity will be affected.