| 摘要 |
A hard disc drive is disclosed, which comprises a compound bearing assembly including stepped shaft 1 having a large-diameter portion 1a and a small-diameter portion 1b, a plurality of balls 4 provided between an outer raceway groove 2b formed in the inner periphery of an outer race ring 3 and an inner raceway groove 2a directly formed in the outer periphery of the large-diameter portion 1a, and a plurality of balls 8a provided between an inner raceway groove 6a formed in the outer periphery of an inner race ring 7a fitted on the small-diameter portion 1b of the stepped shaft 1 and an outer raceway groove 6b directly formed in the inner periphery of a portion of a sleeve-like outer race ring 5 adjacent an end thereof. A hub 12 of a rotor 11 of a motor of the hard disc drive is fitted on the compound bearing assembly.
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