Patent ID: 8467146

Claim:
An apparatus for clamping a disk, comprising: a rotor case jointed with an outer peripheral surface of a shaft and rotating together with the shaft; a flange part including a disk mounting surface formed at a radial outer side of the rotor case and formed to be inclined as the disk mounting surface is toward the radial outer side; and a clamping member pressing and clamping the disk to the rotor case, wherein an inclination of the disk mounting surface of the flange part is changed depending on the position of the pressing point to the disk of the clamping member, and wherein the disk mounting surface of the flange part is formed to be inclined upwardly in an axial direction when the pressing point is outward of the radial center of the flange part and is formed to be inclined downwardly in the axial direction when the pressing point is inward of the radial center of the flange part.