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US 12,158,180 B2Granted
Fluid dynamic bearing, spindle motor, hard disk drive device
AssigneeMINEBEA MITSUMI Inc.
InventorsTadashi Akahori, Kazuya Iinuma
Life of this patent
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Abstract
A conical bearing member includes a communication hole communicating an inner peripheral surface and an outer peripheral surface of the conical bearing member, and the inner peripheral surface includes a press-fit region in contact with a shaft and an enlarged diameter region having a diameter greater than a diameter of the press-fit region and including an inner opening part of the communication hole. A tapered part having a diameter increasing toward the enlarged diameter region is provided at an end part of the press-fit region on the enlarged diameter region side.
Claims8
A fluid dynamic bearing comprising:
- a conical bearing member press-fitted with a shaft, wherein
- the conical bearing member includes a communication hole configured to communicate an inner peripheral surface and an outer peripheral surface of the conical bearing member,
- the inner peripheral surface includes a press-fit region in contact with the shaft and an enlarged diameter region having a larger diameter than the press-fit region and including an inner opening part of the communication hole,
- wherein the conical bearing member includes a guide region adjacent to the enlarged diameter region, the guide region having an inner diameter identical to an inner diameter of the press-fit region, and
- a tapered part is provided at an end part of the press-fit region on a side of the enlarged diameter region, the tapered part having a diameter increasing toward the enlarged diameter region.
2 more elements
Dependencies are inferred from the claim text.