Patent ID: 8242655

Claim:
An engine cooling system, comprising a fan unit, cooling pipes, cooling channels in the engine and a coolant tank, the coolant tank, the cooling pipes and the cooling channels in the engine being connected together and forming a cooling circuit, the fan unit being used to cool the cooling pipes and coolant therein, the fan unit comprising a motor and fan blades driven by the motor; wherein the motor comprises a stator and a rotor rotatable mounted confronting the stator; the rotor comprising a shaft, a commutator fitted to the shaft, a rotor core fitted to the shaft adjacent to the commutator, windings wound about teeth of the rotor core and electrically connected to segments of the commutator; the windings being formed from aluminum cored wire that has an electrical insulation film around its peripheral surface, each of the segments comprising a hook formed at one end thereof, a protective film encapsulating the hook and lead wire of the windings after the lead wire and the hook are soldered together for preventing the soldered hook and lead wire from being corroded by oxygen and/or moisture.