Patent ID: 7938212

Claim:
An in-wheel motor system, comprising: a knuckle supporting a hub to be rotatable and including a tank portion in which a refrigerant is accumulated; a housing formed as a component different from the knuckle and fixedly attached to the knuckle; a motor incorporated within the housing and driving the hub to rotate; a pump incorporated within the housing and pumping the refrigerant accumulated within the tank portion to the motor by means of a rotational power of the motor to refrigerate the motor; a first pipe connecting the pump and the tank portion without passing through the knuckle and sending the refrigerant within the tank portion to the pump; a first flow passage sending the refrigerant pumped from the pump to each component member of the motor; and a second pipe connecting the housing and the tank portion without passing through the knuckle and sending the refrigerant within the housing to the tank portion.