本文介绍了能减小把手回转力矩的新型挖坑机。在挖坑机钻头部分设计内、外两个轴,钴尖和刀片安装在内轴,螺旋工作面焊在套于内轴的空心外轴上。挖坑机工作时,因内、外轴转向相反,把手上的大部分反作用力将被抵消。作者通过对一种混合轮系减速器传动型式和两种组合式摆线针轮行星减速器型式的对比分析,推荐了一种较优的设计方案。 This article describes a new type of digging machine that reduces the handlebar turning moment. In digging machine bit part of the design, the two outer axes, cobalt tip and blade mounted on the inner shaft, spiral face welding set in the inner shaft hollow outer shaft. Digging machine work, due to the inner and outer shaft steering the opposite, most of the reaction force on the handle will be offset. By comparing the transmission type of a hybrid gear reducer and the two types of combined cycloid gear reducer, a better design is recommended.