The equabions on tooth shape of internal gear by means of envelope method is derived and the pressure angle, inflection point, curvature, topcut are analysised in detail.
用包络法导出了内齿轮的齿形方程，对压力角、曲率、拐点、顶切进行了详细分析，并给出了计算公式。
2
The text introduces the conception of the radial angle, and uses it to explain the inflection of the side width, and establishes the formula of the radial angle.
本文引入扩散角的概念，用此概念说明桩侧边长度对于计算宽度的影响，从而建立计算宽度的计算公式。
3
We find the similarity of syntax between OE and Russian in modern Slavic and the reasons from a cross-linguistic Angle, after an analysis of inflection and syntactic traits in OE.