传统的加工制动凸轮轴的方法是在靠模铣床上加工，效率低、精度差。

The traditional processing method of brake CAM shaft is to process on the profiling machine, with low efficiency and bad precision.

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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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现阶段S凸轮鼓式制动器在重型商用车辆上有着广泛的应用。

S-shaped cam drum brakes are applied in heavy commercial vehicles extensively.

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