| 摘要 |
A plurality of toroidal sealing plates 16a, 16b, and 16c spaced axially by slight gaps S1 and S2 are disposed between spindle 3 and vertical bore 6 of the rotor hub at above and/or below the bearing apparatus such that the outer or inner peripheral portion of each plate is secured to the inner peripheral portion of the bore of the rotor hub or the outer peripheral portion of the spindle so as to leave slight radial gaps alpha1, alpha2 and alpha3 between the inner or outer peripheral portion of each plate and the outer peripheral portion of the spindle or the inner peripheral portion of the bore of the rotor hub to make each sealing plate uncontacted with the spindle or the bore, wherein the radial gaps are positioned alternately on the side of the spindle or on the side of the bore of the rotor hub.
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