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US 8,297,844 B2Granted
Fluid dynamic bearing device
AssigneeNtn Corporation
InventorsJun Hirade, Kimihiko Bito, Tetsuya Yamamoto
Life of this patent
Estimating the term…
Abstract
To manufacture a shaft member, which is excellent in both accuracy and strength at low cost, a shaft member (2) includes a shaft portion (21) and a flange portion (22) provided to one end of the shaft portion (21). The flange portion (22) has an annular shape, and the shaft portion (21) and the flange portion (22) are fixed by a welded portion (23), which is formed by applying a laser beam (35) to an upper end of an inner periphery thereof.
Claims13
A fluid dynamic bearing device, comprising:
- a shaft member comprising
- a shaft portion, and
- a flange portion provided at one end of the shaft portion;
- radial bearing gaps formed with an outer peripheral surface of the shaft portion;
- and
- thrust bearing gaps formed with end surfaces of the flange portion,
- wherein the flange portion has an annular shape, and
- wherein a welded portion is formed by fixing the flange portion and the shaft portion to each other by welding at an end portion of said flange portion which is axially closest to the radial bearing gaps, on an inner periphery of the flange portion.
5 more elements
A fluid dynamic bearing device, comprising:
- a shaft member comprising
- a shaft portion and
- a flange portion provided at one end of the shaft portion;
- radial bearing gaps formed with an outer peripheral surface of the shaft portion;
- and
- thrust bearing gaps formed with end surfaces of the flange portion,
- wherein the shaft portion and the flange portion are fixed to each other by welding in a state in which an aligning mechanism is interposed therebetween and both the shaft portion and the flange portion are held in linear contact with each other.
4 more elements
Dependencies are inferred from the claim text.