Usual plate gear have big diameter, but thin in depth, and have a axle hole in the center, so it can be simplified into a thin disc ring.

由于常用的盘形齿轮直径大，厚度小，且中间有较大的安装轴孔，所以可以将其简化为薄环盘，与变幅杆组成变幅器。

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This paper introduces a new method cutting the profile of tooth of large gear ring, which has no upper limit diameter.

介绍了一种大型齿圈齿形加工的新方法，并对其加工原理、主要参数的选择计算和切削试验结果进行了分析。

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