Patent ID: 8754555

Claim:
A rotating member assembly comprising: a shaft including an outer surface step part provided in an outer surface thereof; and a rotor hub including an insertion hole into which the shaft is inserted, the insertion hole including an inner surface step part provided in an inner surface thereof and corresponding to the outer surface step part, such that the inner surface step part and the outer surface step part are fittingly-coupled to each other, wherein the outer surface of the shaft is divided into a first outer surface part on all part of an upper portion thereof and a second outer surface part on a lower portion thereof, based on the outer surface step part, the inner surface of the rotor hub is divided into a first inner surface part on an upper portion thereof and a second inner surface part on a lower portion thereof, based on the inner surface step part, the first outer surface part is fittingly-coupled to the first inner surface part and the second outer surface part is fittingly-coupled to the second inner surface part, the second outer surface part has a diameter larger than the first inner surface part, and the shaft and the rotor hub include an adhesive provided therebetween.