According to the shape of axis, axis can be divided into two types: crankshaft and straight axis. According to the loading condition of the shaft, it can be divided into: (1) the shaft, which is subjected to both bending moment and torque, and is the most common shaft in the machine, such as the shaft in various gearbox. (2) the mandrel, which is used to support rotating components were not only under bending moment and torque, some of the spindle rotation, such as the axis of the railway vehicle, some of the spindle is not turning, such as the shaft supporting pulley and so on. (3) the shaft, is mainly used to transfer torque and not under bending moment, such as to the long axis of the mobile crane, automobile drive shaft, etc.
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