| 摘要 |
A spindle structure in which a noise occurrence due to a tap hole and a screw 2007 is effectively prevented. A nut 8 for adjusting a preload of a bearing 5 is threadedly engaged with an outer circumference of a spindle 2 . On an edge of the nut 8 , a plurality of tap holes for balance adjustment are provided at even intervals on a circumference centered around the axis of the spindle 2 and to be parallel to the axial direction of the spindle 2 . These tap holes are countersinked, and a plate screw 11 is threadedly engaged so that an edge of each plate screw 11 is flush with a surface of the nut 8 . In addition, the plate screw 11 is used as a balance weight by changing the length thereof.
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