重点难点

本篇重点内容为常用机构的工作原理、组成、特点、运动分析及设计的基本方法。

通过学习,达到以下基本要求:

(1) 熟悉常用机构的工作原理、特点及应用;

(2) 具有常用机构设计的基本方法和基本技能。

平面连杆机构

1.铰链四杆机构和含有移动副的四杆机构的组成、运动原理、结构特点及其应用;

2.铰链四杆机构的基本特性,曲柄存在条件、急回特性、传力性能;

3.了解图解法设计平面连杆机构的方法和原理。

凸轮机构

1.凸轮机构的组成,结构特点、类型及应用;

2.从动件常用运动规律;

3.用图解法(反转法)设计对心移动从动件盘形凸轮轮廓曲线;

4.了解滚子半径、基圆半径、压力角、凸轮材料与热处理、凸轮结构设计及在轴上的固定方法等。

间歇运动机构

1.棘轮机构和槽轮机构工作原理及类型;

2.棘轮机构和槽轮机构的特点及应用;

3.棘轮转角的调节方法



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