Fluid bearing apparatus including dynamic pressure grooves with striations, spindle motor, and disk drive apparatus
US9422974B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 2015 |
| Grant date | Aug 23, 2016 |
| Priority date | — |
| Expiry date | Aug 11, 2035 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2370/12
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fluid bearing apparatus includes a stationary member and a rotating member. A bearing surface of the stationary member and a bearing surface of the rotating member are arranged opposite to each other with a minute gap intervening therebetween. A lubricating fluid is arranged in the minute gap. At least one of the bearing surfaces includes a dynamic pressure groove, and a plurality of striations defined in a bottom portion of the dynamic pressure groove. Each of the dynamic pressure groove and the striations is arranged to extend in a direction at an angle greater than 0° to a circumferential direction. An angle defined between each striation and the circumferential direction is equal to or smaller than an angle defined between the dynamic pressure groove and the circumferential direction. Thus, an improvement in a force of dynamic pressure at the dynamic pressure groove is achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.