中文摘要：

提出了一种按给定传动比要求设计平面四杆机构的设计方法。首先分析了四杆机构传动比的变化特征：然后根据给定的传动比要求,进行了图解设计并引入了解析计算;最后绘制了机构的设计线图。

英文摘要：

A design method has been put forword for planar four-bar mechanism with the given transmission ratio.Firstly,the changing characteristics of the transmission ratio are analyzed.Then,according to the required transmission ration,the graphic design of planar four-bar mechanism is performed with analytical calculation.Finally,the mechanism design atlas is provided.