Patent ID: 7314314

Claim:
An oil retaining structure of a spindle, comprising a spindle penetrating and rotating in a through hole of a bearing having oil, wherein the outer peripheral surface of the spindle is provided with a first oil groove extending spirally along a clockwise direction and a second oil groove extending spirally along a counterclockwise direction, the first oil groove and the second oil groove across each other so as to form a plurality of collecting points; wherein the bearing is disposed in a spindle motor that comprises a metal tube, a stator and a turntable, the metal tube has a one-way opening on the top thereof and an upper accommodating chamber and a lower accommodating chamber in the interior thereof, the bearing is disposed in the lower accommodating chamber and has a locking ring on the upper end thereof, the locking ring is fastened with an upper lid so that the upper end of the bearing is affixed in the upper accommodating chamber, the stator is affixed on the outer peripheral surface of the metal tube, the spindle is inserted and affixed at a center of the turntable, and has an annular groove to be locked by the locking ring, the turntable has a motor housing on the bottom surface around the circumference thereof, the motor housing has a ring-shaped magnet on the inner surface thereof.