Shaft member for fluid dynamic bearing device and manufacturing method for shaft member
US9931725B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 2014 |
| Grant date | Apr 3, 2018 |
| Priority date | — |
| Expiry date | Nov 27, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2226/10
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Grinding is performed on an outer peripheral surface of a shaft member while rotationally driving the shaft member under a state in which both end surfaces of the shaft member are sandwiched between a pair of support portions. A convex surface is formed on one axial end surface of the shaft member or an end surface of one of the pair of support portions, and a flat surface is formed on the other of the one axial end surface of the shaft member and the end surface of the one of the pair of support portions. The flat surface and an apex of the convex surface are brought into contact with each other to support one axial end portion of the shaft member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.