由于油泵齿轮的特殊用途 ,加工时既要求齿轮的齿根圆滑 ,有一定的根切量和足够的存油空间 ,又不能使齿轮齿根根切过大 ,影响有效渐开线齿形长度 ,造成啮合不平稳。因此 ,需要特殊设计剃前齿轮滚刀。以加工Ｍ5、α =2 0°、Ｚ =7、ｘ =0 .38的油泵齿轮为例 :常规设计的剃前齿轮 Due to the special use of oil pump gear, the gear tooth root is required to be processed smoothly, with a certain amount of root cut and sufficient oil storage space, and can not make the gear root root cut too large, affecting the effective involute tooth length, Cause the engagement is not smooth. Therefore, the need for special design shaving gear hob. Taking the pump gear with M5, α = 20 °, Z = 7, x = 0.38 as an example: The conventional designed shaving gear