Gear shaft forgings according to the shape of the axis, the shaft can be divided into crankshaft and straight shaft two categories. According to the bearing capacity of the shaft, it can be further divided into:
(1) The rotating shaft, when working, bears both bending moment and torque. It is the most common shaft in machinery, such as the shaft in various reducers.
(2) mandrel, used to support the rotating parts only bear the bending moment and do not transfer the torque, some mandrel rotation, such as the railway vehicle shaft, some mandrel does not rotate, such as the supporting pulley shaft, etc.
(3) drive shaft, mainly used to transfer torque without bending moment, such as the long optical shaft of the crane mobile mechanism, the driving shaft of the car, etc.