US Patent 7975789 Wheel assembly with in-wheel motor

A wheel assembly with an in-wheel motor includes a motor for driving a wheel, which is arranged in the wheel; a reduction mechanism that reduces the rate of rotational output of the motor and transmits the resultant rotational output to the wheel; an oil tank in which oil collects; an oil pump that is driven by rotational output of the motor; and an oil flow path that leads oil from the oil pump to at least one of the motor and the reduction mechanism. The oil tank is arranged below the reduction mechanism, farther toward a vehicle inside in a vehicle width direction than a brake dust cover, and farther toward the vehicle outside in the vehicle width direction than a lower ball joint.