利用凸轮机构的分析理论，获得了加工DD680系列汽车制动凸轮的轮廓曲线方程和加工该靠模凸轮的刀具中心轨迹方程。

The profile equation of brake cam of DD680 series motor vehicles and tool path equation for processing copying cam have been obtained by using analytical theory of cam mechanism.

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本文阐述了单轴对称曲线新机构的构成特点，分析了轨迹方程及其解析法。

The paper presents the constitutional characteristics of the new mechanism of the symmetric curves with the single axis and analyses the path equation and its solutions.

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研究了二次抛物线型的GRIN球透镜的光线轨迹方程序；得出其轨迹为椭圆曲线及一些重要结论。

At last, the author obtained the equation of ray trace in the GRIN ball lens with the index profile which is quadratic and drew some important conclusions.

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