Abstract: A lubrication system of a power assembly of an electric scooter includes a case duct and a bearing seat duct formed in a case of the power assembly, and a driven gear shaft duct formed in a driven gear shaft of a driven gear. Lubricant flows to the case duct, the driven gear shaft duct, a driven gear bearing seat in the case, the bearing seat duct, a driving bearing seat in the case in sequence. The lubrication system has a short flowing distance of the lubricant to enhance the effects of lubrication and reducing temperature.

Abstract: A controlling system of an electric scooter includes a case having a mounting room therein; and a circuit board received in the mounting room of the case, and having a recess portion at an edge thereof. A driving shaft of an electric motor has at least a section in the mounting room of the case and received in the recess portion of the circuit board. It may reduce a size of the case.

Abstract: A power assembly of an electric scooter includes a case, in which an electric motor, a driven gear, and a controller are received. The case has a base, and the base is provided with a separating layer to divide a space in the base into a first space and a second space. The electric motor has an output shaft and a driving gear connected to the output shaft. The driving gear is received in the first space of the base. The driven gear is received in the first space of the base and mesh with the driving gear. A gear shaft is connected to the driven gear, and the gear shaft has an end extending out of the case. The controller is provided in the second space of the base and electrically connected to the electric motor.

Abstract: A controlling system of an electric scooter includes a case having a mounting room therein; and a circuit board received in the mounting room of the case, and having a recess portion at an edge thereof. A driving shaft of an electric motor has at least a section in the mounting room of the case and received in the recess portion of the circuit board. It may reduce a size of the case.

Abstract: A lubrication system of a power assembly of an electric scooter includes a case duct and a bearing seat duct formed in a case of the power assembly, and a driven gear shaft duct formed in a driven gear shaft of a driven gear. Lubricant flows to the case duct, the driven gear shaft duct, a driven gear bearing seat in the case, the bearing seat duct, a driving bearing seat in the case in sequence. The lubrication system has a short flowing distance of the lubricant to enhance the effects of lubrication and reducing temperature.

Abstract: An integrated power module of an electric scooter includes a motor unit and a transmission unit. The motor unit includes a motor case, in which a stator, a rotor and a shaft are provided. A board is fixed to an end of the motor case, and a holder is fixed to the board. The transmission unit has a lid connected to the board to form a lubricant chamber. The motor shaft passes through the holder to the lubricant chamber. The transmission unit further includes a transmission shaft, which is connected to the motor shaft through a pair of meshed gears. The motor shaft is provided with a spiral slot to force lubricant in the holder flowing to the lubricant room instead of flowing to the motor unit when the motor shaft is rotating.