Electric axle driving system and automobile

An electric axle driving system is used for an electric automobile or a hybrid electric vehicle and comprises a motor, a speed reduction mechanism and a differential mechanism. The speed reduction mechanism is used for amplifying driving force generated by the motor and allocating the driving force to wheels through the differential mechanism. The speed reduction mechanism can amplify the driving force through two different transmission ratios. In the process from driving force generation to allocation of the driving force to the wheels, amplification is conducted at least three times. Within the limited space range, the transmission ratio is increased, and accordingly the workpiece selection requirement of the motor is lowered or the torque output upper limit is increased. 种电轴驱动系统，用于电动汽车或混合动力汽车，其包括电动机、减速机构和差速器，所述减速机构将所述电动机产生的驱动力放大并通过差速器分配到车轮上，其中所述减速机构能够通过两个不同的传动比对驱动力进行放大，所述驱动力从产生到被分配到车轮上的过程中，经过至少3次放大。在有限的空间范围内，提升了传动比，从而降低了电动机的选件要求或者提高了扭矩输出的上限。