上轴 meaning in Chinese

enamelling
top roll
upper shaft
upper spindle

Upper axles tower , seat of lower axle )
里程表机芯（上轴座、下轴座）
Analysis on sudden brittle broken of the upper axle journal on screw grader and suggestions
螺旋分级机上轴头突然脆性断裂的事故分析及建议
Packaging of components for automatic handling - part 1 : tape packaging of components with axial leads on continuous tapes
自动装卸用元件的包装.第1部分:连续包装带上轴向抽头的元件的带包装