The structural design of the shaft is an important step in determining the reasonable shape and overall structural dimensions of the shaft. 的类型与尺寸，轴的毛坯、制造和装配工艺、安装及运输，对轴的变形等因素有关。 It consists of the type, size and position of the parts mounted on the shaft, the way the parts are fixed, the nature, direction, size and distribution of the load, the type and size of the bearing , the shaft blank, manufacturing and assembly processes, installation and transportation, And other factors. The designer can design according to the specific requirements of the shaft. If necessary, several schemes can be compared to select the best design scheme. The following are the general shaft structure design principles:
1. Save materials, reduce weight, and try to use cross-sectional shapes with equal strength or large cross-section coefficient;
2. Easy to accurately position, stabilize, assemble, disassemble and adjust parts on the shaft;
和提高强度的结构措施； 3. Use various structural measures to reduce stress concentration and increase strength;
4, easy to manufacture and guarantee accuracy.