Shaft member for fluid bearing device, manufacturing method therefor, and fluid bearing device
US10837486B2 · kind B2 · utility
0Cited by
5References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 31, 2017 |
| Grant date | Nov 17, 2020 |
| Priority date | — |
| Expiry date | Aug 31, 2037 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2370/12
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A shaft member for a fluid bearing device includes, on an outer peripheral surface thereof, two bearing surfaces (31 and 32) separated from each other in an axial direction, and a middle relief portion (33) formed between the bearing surfaces (31 and 32) and having a diameter smaller than a diameter of the bearing surfaces. The middle relief portion (33) includes a cylindrical surface portion (331) having a ground surface, and stepped portions (332) arranged on both axial sides of the cylindrical surface portion and having a diameter difference from the cylindrical surface portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.