countershaft

详细解释:n. 对轴
【建】 对轴, 副轴, 对转轴

详细解释：

coun.ter.shaft

n.（名词）
An intermediate shaft between the powered and driven shafts in a belt drive.
副轴，天轴：传送带上介于动力轴与驱动轴之间的中间轴