Patent ID: 8091099

Claim:
A spindle motor, comprising: a base; a bearing housing disposed on the base; a bearing in the bearing housing; a rotation shaft is rotatably supported by the bearing; a stator coupled to the bearing housing, wherein the stator includes a core and a coil, wherein the core is supported by a lateral surface and an upper surface of the bearing housing; a hush directly coupled to the rotation shaft exposed from an upper portion of the bearing housing, wherein an uppermost surface of the bush is not lower than an uppermost surface of the rotation shaft; a rotor yoke directly coupled to the bush, wherein the rotor yoke is spaced from the rotation shaft; a magnet fixed on an inner circumference of the rotor yoke and faced with the stator; and a clamping device disposed on the rotor yoke, wherein the rotor yoke includes a first portion supporting the clamping device, a second portion connected to the first portion and supporting a disk, and a third portion connected to the second portion and coupled to the magnet, wherein the first portion includes a flat upper surface lower than an upper surface of the second portion, and wherein the clamping device is directly contacted with the flat upper surface of the first portion.