Drive system of an electric vehicle

A drive system of an electric vehicle comprising:

• a drive motor;
• a transmission having an input shaft, a countershaft, an output shaft, a first transmission unit, a first clutch, a second transmission unit and a second clutch;
• wherein, the drive motor is attached to the input shaft;
• the input shaft is attached to the countershaft to provide power of the drive motor to the countershaft;
• the first transmission unit is placed between the countershaft and output shaft to transmit power between the countershaft and the output shaft;
• the second transmission unit is placed between the countershaft and the input shaft to transmit power between the countershaft and the input shaft;
• the first clutch is attached to the countershaft and connected to the first transmission unit, for linking or cutting off the power transmission between the countershaft and the first transmission unit;
• the second clutch is attached to the countershaft and connected to the second transmission unit, for linking or cutting off the power transmission between the countershaft and the second transmission unit;
• a first transmission ratio of the first transmission unit is greater than a second transmission ratio of the second transmission unit;
• and
• a hydraulic system connected to the first clutch to engage or disengage the first clutch, and connected to the second clutch to engage or disengage the second clutch.