Hydrodynamic bearing and spindle motor and information recording and reproducing apparatus equipped with the same
US7862237B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 2, 2008 |
| Grant date | Jan 4, 2011 |
| Priority date | — |
| Expiry date | May 29, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K7/085
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
As axis direction dimensions become smaller in HDD spindle motors as a result of thinner and more compact designs, there is a demand for hydrodynamic bearings with a long lifespan. As a means of solving this problem, a lubricant reservoir section is formed between a sleeve side surface and a cover side surface with a depth varying in a circumferential direction, lubricant is circulated in a bearing gap section, a sleeve end face gap section larger than a bearing gap between a sleeve end face and the cover, and a connecting channel, and the lubricant reservoir section and the sleeve end face gap section are connected via an introducing gap section having a bubble separation function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.