Spindle, used to support the rotating parts only to bear the torque without torque transmission, some mandrel rotation, such as the railway vehicle shaft, some mandrels do not rotate, such as supporting the pulley shaft. According to whether the axis of rotation, the mandrel can be divided into rotating mandrel and fixed mandrel: Turn the mandrel: Bearing bending moments, and shaft rotation; Fixed mandrel: Bearing bending moments, and the shaft fixed. According to the role played by the shaft and bear the load, can be divided into mandrel, shaft and drive shaft: the central axis: only to bear the moment without torque transmission; shaft both to bear the torque and torque transmission; only the transmission shaft torque Do not bear bending moment, or bending moment is very small.
