On the basis of the first envelope, the paper stresses on the tooth contact analysis of the second envelope, and the equations of a worm and a wormwheel flanks are derived.
本文在第一次包络的基础上，着重进行了二次包络齿面接触分析，推导出了蜗杆和蜗轮齿面方程。
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。
Upper envelope model is derived from the characteristics of our price index. This paper is of extensive practical value.
并根据我国物价指数变化的特点，进一步建立了上包络线模型．使本文更具实际意义。
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