This paper introduces the structure model, work-ing principle and the calculation of the overload protec-tion of the new gearing which is used in a small - size hoisting machine.

• 介绍一种小型起重机械的新型传动装置的结构形式、工作原理以及超载保护装置的设计计算,并以环链电动葫芦的设计为例说明其应用。