| 摘要 |
A computer direct disc drive wherein a hub is mounted on a shaft supported in spaced bearings within a housing with one of the bearings being fixed and the other bearing having an outer race which is free to float both radially and axially and wherein a biasing spring arrangement and a preload sleeve is positioned around the shaft to bias the outer race of the floating bearing away from the fixed bearing, the improvement which consists mounting magnets within the preload sleeve in axially spaced relationship to each other and in radially spaced relationship to the shaft to set up a magnetic circuit through the shaft, preload sleeve and housing to bias the shaft toward the magnets and force the outer race of the floating bearing into engagement with the housing to thereby stabilize it against radial movement while still permitting it to move axially to compensate for thermal variations to which the direct disc drive is subjected. In another embodiment, disc springs are located between the housing and the outer race, and the magnets are mounted on the housing.
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