Shaft is one of the important parts

Shaft is one of the important parts of machinery. It is to install a variety of transmission parts, so that it rotates around its axis, drive torque or rotary motion, and is connected with the frame through bearings. The shaft and its parts form a assembly - the shafting assembly. In the design of the shaft, not only the shaft itself should be considered, but also must be closely related to the entire structure of the shaft.Because the shaft used for vibration transmission transmits torque and bears the bending moment, the designed step shaft I is a rotating shaft. Since the smaller pulley has been designed, the size of the larger pulley has been determined, leaving only the shaft diameter to be determined. The initial design of the shaft is to check the bending strength against the torsion strength. Because the material of the shaft is a lot, so the strength, stiffness and bending strength of the shaft mainly depends on the use conditions of the shaft and other mechanical properties, so the heat treatment method is adopted, the manufacturing process is considered, and the economy is reasonable. The material of the shaft is chosen by design calculation, the most common being 45? Steel is selected as the shaft material, and the required shear stress is 40MPaThe shaft and its parts are combined to form a module. In the design of the shaft, not only the shaft itself should be considered, but also the overall structure of the shaft components must be closely related. The structural design of the shaft is based on the initial calculation of the shaft diameter. In order to meet the requirements of the positioning and fastening of the parts on the shaft, and facilitate the processing of the shaft and the assembly and disassembly of the parts on the shaft, the shaft is usually designed as a step shaft. The task of shaft structure design is to reasonably determine the shape of the step shaft and all the structural dimensions. The shaft is made of 45 steel. To ensure its mechanical properties, quenching and tempering or normalizing treatment.