| 摘要 |
To provide cramp mechanism for cramping a disk medium (3) with an even cramp load without needing special process such as heating shrinkage fit, the cramp mechanism comprises a disk cramper (4) having an inside opening and a cramping part (A) for cramping the disk medium (3), a cylindrical wall provided on a spindle hub (2) having the same center axis with a spindle motor (7), and a cramp nut (5). The outside surface of the cylindrical wall is configured to make a clearance fit at a fitting part (B) with the inside opening of the disk cramper (4), and the inside surface of the cylindrical wall is made tapered and provided with screw threads. On condition that the disk cramper (4) is added with a pre-load for cramping the magnetic disk medium (3), the cramp nut (5) is screwed onto the spindle hub (2) engaging with the screw threads with a tightening force (C) so as to deform the fitting part (B) to make a close fit with the disk cramper (4).
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