Patent ID: 7059443

Claim:
A motor-cooling structure of a front-and-rear-wheel-drive vehicle having an engine adapted to drive first driven wheels and a motor adapted to drive second driven wheels, wherein a driving force of the motor is transmitted to the second driven wheels through a reduction unit and a differential, the motor-cooling structure comprising: a casing accommodating the reduction unit and the differential therein; an oil sump formed on a bottom of the casing; a first oil storage chamber provided within the casing, the first oil storage chamber storing an oil splashed from the oil sump by a driven gear of the differential; a second oil storage chamber provided within the casing, the second oil storage chamber storing the oil splashed from the oil sump by the driven gear of the differential; a first oil supply passage provided in an inner surface of the casing to supply the oil stored within the first storage chamber into a motor shaft by gravitational force, wherein the motor accommodated in a motor housing coupled to the casing is cooled; an oil supply means disposed in the second oil storage chamber and driven by the motor; and a second oil supply passage provided in the inner surface of the casing to supply the oil splashed by the oil supply means into the motor shaft to cool the motor.