Importance

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Abstract

A disk drive motor has a mounting plate with a circuit board on one face and a cylindrical hub extending therethrough. A stator is secured to the plate and exterior of the hub. A cup-shaped rotor overlies the stator and has a rotor shaft journaled in the hub by spaced sealed precision bearings. The bearing opening includes an integral ledge which forms bearing chambers having smooth, uninterrupted walls within which a bearing is secured. Each bearing has an outer race secured within the chamber and an aligned inner race secured to the shaft, with end sealing members to seal the bearings. Spring means are located between each ledge are the inner races of the corresponding bearings to load the bearings. In assembly, the one bearing is assemblied on the shaft and inserted into the hub with the outer race adhesively bonded in place. The opposite bearing is close fitted into the opposite bearing and the shaft is pressed into the bearing during the assembly. Each of said bearings is preloaded with about 20 to 30 percent of maximum and both lubricates the bearing and reduces operational bearing noise.

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First Claim