Spindle device and bearing device therefor
US5683183A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1996 |
| Grant date | Nov 4, 1997 |
| Priority date | — |
| Expiry date | Sep 26, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2370/12
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A bearing device includes a housing, a shaft arranged in an inner circumference of the housing, and a pair of bearings arranged between the shaft and the housing, and spaced from each other in an axial direction of the shaft, at least one of the bearings comprising a sleeve inserted in the housing and formed cylindrically. The sleeve has an outer layer portion including an outer cylindrical surface and an inner layer portion including an inner cylindrical surface, the outer layer portion being harder than the inner layer portion, the inner cylindrical surface having a groove for generating dynamic pressure. The sleeve is improved in working accuracy, and the dynamic pressure generating grooves can be formed with ease.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.