介绍了大变位齿轮的特点，变位系数的设计准则。
This article introduces the characteristic of big modified gears and its design criterion.
介绍了加工大模数、大变位齿轮的大直径双头滚刀的设计要点及实际应用效果。
The design points and practical application results of large diameter double thread hob to machine large module gears or large profile shifted gears are introduced.
采用计算机可视化方法设计大变位齿轮变位系数，此方法实用、可靠，适合工程应用。
The modification coefficient of big modified gears is designed by visual method, this method is practical and re-liable, it is suitable for engineering application.
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