Spindle device and bearing device therefor

Details Spindle device and bearing device therefor Spindle device and bearing device therefor

1996-09-26

1997-11-04

Hannon, Thomas R.

Bearings

Rotary bearing

Fluid bearing

384101, 384114, 384625, F16C 3206

Patent

active

056831838

ABSTRACT:
A bearing device includes a housing, a shaft arranged in an inner circumference of the housing, and a pair of bearings arranged between the shaft and the housing, and spaced from each other in an axial direction of the shaft, at least one of the bearings comprising a sleeve inserted in the housing and formed cylindrically. The sleeve has an outer layer portion including an outer cylindrical surface and an inner layer portion including an inner cylindrical surface, the outer layer portion being harder than the inner layer portion, the inner cylindrical surface having a groove for generating dynamic pressure. The sleeve is improved in working accuracy, and the dynamic pressure generating grooves can be formed with ease.

REFERENCES:
patent: 5028148 (1991-07-01), Kanamaru et al.
patent: 5366298 (1994-11-01), Toshimitsu et al.
patent: 5536088 (1996-07-01), Cheever et al.
patent: 5541462 (1996-07-01), Nii et al.

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