低副是指两构件通过面接触而构成的运动副。按两构件之间的相对运动特征低副分为转动副、移动副、螺旋副。
链接的刚体之间包括高副和低副两个要素。
Lower and higher pairs Connections between rigid bodies consist of lower and higher pairs of elements.
仅采用低副的平面机构叫做“平面连杆”机构，可以只包括转动副和棱形副。收藏。
Planar mechanisms utilizing only lower pairs are called planar linkages, they may include only revolve and prismatic pairs.
所设计的楔块式低副单向超越离合器，主要由内环、外环、楔块和拨盘等构件组成。
The V-shaped unidirectional clutch is made of inner ring, outer ring, wedge and driven disk.
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