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第十章凸轮机构

10.1 凸轮机构的应用与分类

10.2 从动件的常用运动规律

10.3 移动从动件盘形凸轮轮廓曲线的图解设计

10.3 移动从动件盘形凸轮轮廓曲线的图解设计

10.3.1 反转法原理

由于其尖顶始终与凸轮轮廓接触，故“反转”后从动件尖顶的运动轨迹即为凸轮的轮廓。这就是图解法绘制凸轮轮廓曲线的原理，称为“反转法”。

下面介绍用反转法设计凸轮轮廓曲线的方法和步骤。

10.3.2 尖顶对心移动从动件盘形凸轮轮廓曲线的设计

10.3.3 滚子对心移动从动件盘形凸轮轮廓曲线的设计

理论轮廓曲线 实际轮廓曲线

10.3.4 凸轮机构设计中应注意的几个问题

1．滚子半径的选择

对于内凹的凸轮廓线，见图，因实际廓线曲率半径r_c，所以不存在实际廓线出现尖点或相交的问题。

滚子半径的选择

2．凸轮机构的压力角

a称为此凸轮机构在图示位置的压力角

3.凸轮基圆半径的确定

4.凸轮机构的材料

凸轮机构工作时，往往承受动载荷的作用，同时凸轮表面承受强烈磨损。因此，要求凸轮和滚子的工作表面硬度高，具有良好的耐磨性，心部有良好的韧性。

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