To improve and stabilize the performance of a dynamic vibration absorber in an in-wheel motor system constructed so that a motor and a vehicle unsprung part are coupled by the dynamic vibration absorber including a hydraulic damper and a guide member.

In mounting an in-wheel motor on the vehicle unsprung part in a floating manner, the dynamic vibration absorber 20 including a motor mounting member 21 fitted to the side surface of a motor case 10a of an electric motor 10, a knuckle fitting member 22 fitted to a knuckle 5, a spring member 23 connecting the motor mounting member 21 and the knuckle fitting member 22, two guide members 24, 24 for guiding the operating direction of the spring member 23, and a hydraulic damper disposed parallel to the guide members 24, 24 is disposed on the side surface of the electric motor 10 in front side of a vehicle, the electric motor 10 and the knuckle 5 are connected to each other, and the hydraulic damper 2 and the guide members 24, 24 can be effectively cooled.

COPYRIGHT: (C)2007,JPO&INPIT