Patent ID: 7156195
Filing Date: 2007-01-02
Classification: F16H,H02K

Abstract:
1. A cooling system for an electric motor of a vehicle, comprising: an electric motor which drives a vehicle; a reduction gear which adjusts a driving force of an output shaft of the electric motor and transmits the driving force to a drive shaft; an in-shaft refrigerant passage provided in a shaft of the reduction gear and the output shaft of the electric motor; a rotation detector chamber which houses a rotation detector for detecting rotations of the output shaft of the electric motor, the rotation detector chamber being provided on an end portion of the output shaft of the electric motor separately from a motor case; and an outside refrigerant passage which allows an inside of the rotation detector chamber and a refrigerant feedback passage in a reduction gear case housing the reduction gear to communicate with each other outside the motor case, wherein a refrigerant which has passed through the in-shaft refrigerant passage is collected outside a motor case housing the electric motor, and is circulated, and the refrigerant is allowed to flow into the rotation detector chamber and is circulated to the refrigerant feedback passage through the outside refrigerant passage.