US 6,200,035 B1Granted

Hydrodynamic gas bearing structure

AssigneeSumitomo Electric Industries, Ltd.

InventorMakoto Otsuki

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Abstract

A hydrodynamic gas bearing structure includes a fixed shaft, a hollow cylindrical sleeve opposing to the fixed shaft with a radial space kept therebetween, and a thrust plate having an opposing surface opposing to an end surface in the axial direction of the sleeve. The opposing surface of the thrust plate has a groove for generating dynamic pressure between the sleeve and the thrust plate, a protruded portion formed at an inner peripheral portion, and a recessed portion formed shallower than the groove, extending from the protruded portion toward an outer peripheral portion. Top surface of the protruded portion is at a position of a first height from the bottom of the recessed portion, and the outer peripheral portion of the opposing surface includes a portion at a position of a second height lower than the first height from the bottom of the recessed portion.

Claims8

Dependent claims

A hydrodynamic gas bearing structure, comprising:

a shaft body;
a hollow cylindrical bearing body opposing to the shaft body with a radial space kept therebetween;
and
a plate-shaped member having an opposing surface opposing to an end surface in axial direction of one of said shaft body and said bearing body;
wherein
the opposing surface of said plate-shaped member has a groove for generating dynamic pressure between said plate-shaped member and one of said shaft body and said bearing body, a protruded portion formed at an inner peripheral portion, and a recessed portion formed shallower than said groove, extending from the protruded portion toward an outer peripheral portion, and
top surface of said protruded portion is at a position of a first height from the bottom of said recessed portion, and an outer peripheral portion of said opposing surface includes a portion positioned at a second height lower than said first height from the bottom of said recessed portion.

4 more elements

Dependencies are inferred from the claim text.