| 摘要 |
A spindle motor ( 80 ) is composed of a sleeve ( 5 ), a shaft ( 1 ) that is rotatably sustained by the sleeve ( 5 ) in a radial direction through a dynamic pressure bearing ( 20 ) containing lubricant ( 12 ), and a hub ( 3 ) that is fixed to the shaft ( 1 ). The hub ( 3 ) has a raised section ( 11 ) in a ring shape that surrounds one end portion of the sleeve ( 3 ). The spindle motor ( 80 ) is provided with a taper seal section ( 14 ) for the lubricant ( 12 ) between an outer circumferential surface ( 10 ) of the one end portion of the sleeve ( 5 ) and an inner circumferential surface ( 13 ) of the raised section ( 11 ), which confronts the outer circumferential surface ( 10 ) of the sleeve ( 5 ), wherein a gap between these surfaces ( 10, 13 ) increases in accordance with a distance from the one end portion of the sleeve ( 5 ), and formed with a reservoir ( 25 ) for the lubricant ( 12 ) between an end surface ( 5 d) of the one end portion of the sleeve ( 5 ) and a surface ( 3 d) of the hub ( 3 ) that confronts the end surface ( 5 d), wherein the end surface ( 5 d) is in parallel with the surface ( 3 d) with maintaining a prescribed gap (g) between them.
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