Dynamic pressure gas bearing structure

Details Dynamic pressure gas bearing structure Dynamic pressure gas bearing structure

1996-03-11

1997-05-13

Hannon, Thomas R.

Bearings

Rotary bearing

Fluid bearing

384114, 384115, 384118, F16C 3206

Patent

active

056285671

ABSTRACT:
Provided is a dynamic pressure gas bearing structure which is applicable to a high-speed rotation driving part such as a hard disk driver or the like and has high rotational accuracy in high-speed rotation. The dynamic pressure gas bearing structure comprises a shaft body and a bearing body. When the shaft body and the bearing body are so arranged that central axes thereof are aligned with each other, a substantially cylindrical gap is defined between the outer peripheral surface of the shaft body and the inner peripheral surface of the bearing body. The gap has at least one gap change portion whose thickness is changed with respect to a central angle corresponding to the circumference along the outer peripheral surface of the shaft body. The gap change rate .alpha. is at least 1.0.times.10.sup.-4 /.degree. and less than 10.0.times.10.sup.-4 /.degree. .

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ShinichiTohgo et al. "Gas Bearing" 1984, pp. 12-15.
Atsunobu Mori, "About Whirling of Gas Bearing" Junkatsu, vol. 20, No. 7, 1975, pp. 481-488.

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