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汽车分电器凸轮是一个在横截面具有外接圆的六顶点弧形凸轮,它的外形如图1。出于其点火工作特点的要求,该凸轮每个顶点两侧并不是对称的轮廓曲线,在对该凸轮的测试中,精确确定顶点位置以获得测量基准是非常重要的。怎样找到顶点的正确位置呢?过去常用于带有基圆的桃形凸轮测量中的找顶点方法,例如直接找转折点法和等角度间隔选择测量点以确定顶点位置,在这里均不适用。我们采用通过“灵敏点”找顶点位置的方
The car distributor cam is a six-point arc cam with a circumscribed circle in cross-section. Its appearance is shown in Fig.1. Due to the characteristics of its ignition work, the cam is not symmetrical on both sides of each vertex curve, in the test of the cam, it is very important to accurately determine the position of the vertex to obtain a measurement basis. How to find the correct position of the vertex? It used to be used to find the vertex in peach cam with base circle, such as finding the vertex directly by finding the turning point method and equi-angular interval to determine the vertex position, which are not applicable here. We use the “smart point” to find the location of the vertex