freewheel roller

基本解释自由轮滚柱

网络释义

1)freewheel roller,自由轮滚柱2)roller,滚柱，滚轮，辊3)cylindrical roller,滚柱轮4)gear roller,齿轮滚柱5)tappet roller,挺柱滚轮6)cam roller,凸轮滚柱

Research on the best hollowness of the cylindrical roller structure of bridge-craft;

架桥机滚柱轮结构最佳空心度研究