bottom roller meaning in English

底辊
负重轮
河底回溜
下辊轮

Drafting bottom rollers for cotton ring spinning machine
棉纺环锭细纱机牵伸下罗拉
Bottom rollers eccentric and vibrating , and lapping on rollers
下罗拉偏心和振动、罗拉间搭接不良。
Wrong settings , improper roller coverings , eccentric top and bottom rollers
工艺错误、皮辊（上罗拉）不合适、上罗拉和下罗拉偏心。
The bottom roller and sub - bottom roller of hcr is calculated about its equivalent stress , contact stress and the distributing of pulling - stress along the inside track of hcr . also , effects of hollowness and pinch fit are analyzed on bearing stress and rated load
主要计算预负荷空心圆柱滚子轴承的最底部滚子和次底部滚子的等效应力、接触应力和滚子内圈拉应力的分布情况，分析滚子空心度和过盈量对轴承应力和额定载荷的影响。