coarse-pitch gear meaning in Chinese

粗径节齿轮
大径节齿轮

One of tooth profiles of coarse - pitch gear ball hob is analyzed in engagement theory ， the tooth profiles of the internal gear has been derived . by comparing the tooth profile with the tooth profile of the standard internal gear , it is shown that the tooth profile is satisfying
对大模数内齿轮球形滚刀的一种齿形进行啮合理论分析，求出滚刀加工出来内齿轮的齿形，然后与标准内齿轮的齿形比较，结果表明：该齿形的滚刀加工的内齿轮能满足要求。