Patent ID: 6980394

Claim:
A spindle used for a disk drive having a recording disk and a case, the spindle motor comprising a rotor part, a stator part and an FDB unit, wherein: the rotor part comprises a rotor hub rotating around a rotary axis integrally with the recording disk, and an annular rotor magnet attached to the rotor hub; the stator part has a stator opposed to a peripheral surface of the rotor magnet in a radial direction, around which a plurality of coils is wound, the base plate to which the stator is disposed and that consists the case of disk drive, and a bush member; the FDB unit comprises a shaft, a sleeve and a bearing housing, and the shaft and the sleeve are mutually supported rotatably by a dynamic pressure groove formed in at least one of opposed surfaces between the shaft and the sleeve and a lubricant retained therebetween to thereby support the rotor part rotatably around the rotary axis with respect to the stator part, and the bearing housing is formed with the sleeve integrally and provides the outer surface of the FDB unit; and the bush member of the stator part is interposed between an inner periphery of a motor attaching part provided in the base plate and an outer periphery of the FDB unit to fix and hold the FDB unit.