Hybrid spindle bearing
First Claim
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1. A fluid dynamic bearing system, comprising:
- an inner member;
an outer member;
a first conical element coupled to the inner member and having a first outer surface;
a second conical element coupled to the inner member and having a second outer surface, the first conical element and the second conical element spaced apart from one another along the inner member;
a first fluid dynamic bearing having a first gap, the first fluid dynamic bearing disposed along the first outer surface and configured to support the relative rotation of the outer member and the inner member; and
a second fluid dynamic bearing having a second gap, the second fluid dynamic bearing disposed along the second outer surface and configured to support the relative rotation of the outer member and the inner member, the first gap substantially smaller than the second gap.
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Abstract
A bearing system in which an axially stiff narrow gap fluid dynamic gas bearing is preloaded by an axially less stiff larger gap fluid dynamic bearing. As an example two fluid dynamic bearings are provided spaced apart along a shaft, one of the bearings comprising a fluid dynamic bearing, the other comprising an air bearing. The fluid dynamic bearing has a larger gap, while the air bearing has a relatively small gap. The overall working surface area of the air bearing may be twice as much or more than the working surface area of the fluid bearing.
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Citations
20 Claims
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1. A fluid dynamic bearing system, comprising:
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an inner member;
an outer member;
a first conical element coupled to the inner member and having a first outer surface;
a second conical element coupled to the inner member and having a second outer surface, the first conical element and the second conical element spaced apart from one another along the inner member;
a first fluid dynamic bearing having a first gap, the first fluid dynamic bearing disposed along the first outer surface and configured to support the relative rotation of the outer member and the inner member; and
a second fluid dynamic bearing having a second gap, the second fluid dynamic bearing disposed along the second outer surface and configured to support the relative rotation of the outer member and the inner member, the first gap substantially smaller than the second gap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification