According to the different loads of the shaft, the transmission shaft can be divided into: the rotating shaft, the spindle and the transmission shaft.

Transmission shaft parts are one of the important parts of mechanical transmission on diesel locomotive. The function of the transmission shaft of Dongfeng 4 locomotive is to transmit the output power of the diesel engine to the hydrostatic gearbox, drive the two hydrostatic pumps to work and pump out the high-pressure hydrostatic oil. At the same time, according to the requirements of oil and water temperature, drive and adjust the hydrostatic motor to work and cool the high and low-temperature cooling water.