| 摘要 |
<p>A hard disc drive is disclosed, which comprises a compound bearing assembly including a stepped shaft (1) having a larger diameter portion (1a) and a smaller diameter portion (1b). A plurality of balls 4 are 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 larger diameter portion (1a). A plurality of balls (8a) are also provided between an inner raceway groove (6a) formed in the outer periphery of an inner race ring (7a) fitted on the smaller 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. <IMAGE></p> |
