| 摘要 |
PURPOSE:To ensure the function of a fluid seal after spindle assembling by connecting a space formed between a magnetic fluid seal and a bearing to other space to prevent destruction of the magnetic fluid seal when the bearing is subjected to press fit. CONSTITUTION:A magnetic disc 1 is fixed to a hub shaft 6, a yoke 7 placed near a bearing 3 and a magnet 8 are fitted to a substrate 4, a magnetic fluid is packed in an air gap between the yoke 7 and the hub shaft 6 to constitute the magnetic fluid seal 2. The space S formed between the bearing 3 and the magnetic fluid seal 2 is connected to the remaining space of the magnetic disc 1 through a vent hole 5 provided to the substrate 4. Thus, in pressing the bearing 3 to the hub shaft 6, the pressure in the space S is not increased to avoid destruction of the seal 2.
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