Patent ID: 7474501

Claim:
A hub assembly comprising: an outer hub; a fastening member coupled to a top portion of the outer hub; and an inner hub or a motor shaft; wherein said outer hub is detachably coupled to an outer periphery of the inner hub or to an outer periphery of the motor shaft, the outer hub is shaped such that a plurality of disks and at least one spacer for maintaining an interval between adjacent disks among the plurality of disks are fitted to an outer periphery of the outer hub; wherein said fastening member fixes the outer hub to the inner hub or the motor shaft; wherein the outer hub comprises a cylindrical body unit, a support unit disposed on a bottom portion of the body unit and supporting the plurality of disks, and a clamping unit disposed on a top portion of the body unit and clamping the plurality of disks; and wherein the body unit comprises an upper body and a lower body, the clamping unit is integrated with a top portion of the upper body in the form of a flange, and the support unit is integrated with a bottom portion of the lower body in the form of a flange; wherein the clamping unit and the top portion of the upper body are parts of a first single-piece unit, and the support unit and the bottom portion of the lower body are parts of a second single-piece unit.