Integrated fan driving speed reducer

An integrated fan driving speed reducer comprises a box body and a driving motor, an input gear integrally machined and formed with a motor shaft is arranged on the motor shaft of the driving motor, the concentricity of the input gear and the motor shaft is guaranteed, an output bearing seat is arranged at the position, corresponding to the motor shaft, of the bottom of the box body, and an output shaft is arranged on the output bearing seat. The output shaft and the motor shaft are located on the same central axis, stability of the gravity center is guaranteed on the premise that installation is convenient, the inner end and the outer end of the output shaft and the inner end and the outer end of the output bearing seat are sleeved with an inner bearing and an outer bearing respectively, the outer bearing is a double-seal deep groove ball bearing, and the output bearing seat is sleeved with a second oil seal between the lower side of the outer bearing and the output shaft. The portion, between the second oil