Patent ID: 8648504

Claim:
A vehicle drive motor comprising: a stator, which includes an annular stator core, provided in an inner periphery of a tubular motor casing, and a stator coil provided in the stator core; a rotor positioned on an inner peripheral side of the stator core and rotatable relative to the stator; an oil supply passage and an oil discharge passage provided in the motor casing and opening at respective locations on an inner diametric surface of the motor casing, which are opposite to each other in an axial direction; and one or more stator core grooves provided in an outer diametric surface of the stator core so as to extend in the axial direction and communicated with the oil supply passage and the oil discharge passage, in which a lubricant oil is allowed to flow from the oil supply passage towards the oil discharge passage through the stator core groove or grooves, wherein the oil discharge passage includes an axially extending oil supply passageway defined so as to extend axially from one end face of the motor casing, and a circumferentially grooved oil supply passageway defined in the inner diametric surface of the motor casing so as to extend in a circumferential direction and is communicated with the axially extending oil supply passageway, and wherein the oil discharge passage includes an axially extending oil discharge passageway defined so as to extend axially from the opposite end face of the motor casing, and a circumferentially grooved oil discharge passageway defined in the inner diametric surface of the motor casing so as to extend in the circumferential direction and is communicated with the axially extending oil discharge passageway.