| 摘要 |
PURPOSE: A spindle motor is provided to maintain an oil interface by gradually processing a surface for a touch surface of oil from an inner side to an outer side in the oil interface. CONSTITUTION: Oil is formed between a shaft(11) and a sleeve(22). A hub(12) is combined with the shaft. A sealing member(13) is separated from an outer circumference surface of the sleeve. An oil interface(31) is formed between the outer circumference of the sleeve and an inner circumference surface of the sealing member. A plurality of surface layers is gradually formed on a surface facing to the sealing member and the sleeve. The oleophilic property of each surface layer is gradually reduced along a surface layer formation direction. |
