轴是旋转零件,其长度大于直径,通常由外圆柱面、圆锥面、内孔、螺纹及相应端面所组成。阶梯轴的断面形状为中间粗两端细,不仅便于轴上零件的定位、固定和装拆,也有利于各个轴段达到或接近等强度,还能满足不同轴段的不同配合特性、精度和表面粗糙度的要求。轴套类零件其上面的退刀槽、倒角和圆角等细部结构基本上已标准化,测绘时可参照标准尺寸。倒角、圆角和退刀槽的尺寸可参照有关国家标准或行业标准。 The shaft is a rotating part whose length is larger than its diameter and usually consists of an outer cylindrical surface, a conical surface, an inner hole, a thread and the corresponding end surface. The cross-sectional shape of the stepped shaft is thin at both ends of the middle, which not only facilitates positioning, fixing and disassembly of the parts on the shaft, but also helps each shaft to reach or approach the same strength and meet the requirements of different mating characteristics, accuracy and Surface roughness requirements. Sleeve type parts above its relief, chamfering and fillet and other details of the structure has basically standardized, mapping can refer to the standard size. Chamfer, fillet and undercut size can refer to the relevant national standards or industry standards.