Fluid dynamic bearing mechanism including communicating channel, spindle motor, and disk drive apparatus
US8169738B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 2011 |
| Grant date | May 1, 2012 |
| Priority date | — |
| Expiry date | Feb 25, 2031 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2370/12
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fluid dynamic bearing mechanism includes a stationary bearing portion including a sleeve portion, and a rotating bearing portion including an outer rotating portion. A lubricating oil is arranged between the stationary and rotating bearing portions. A first dynamic pressure groove array is arranged in an upper surface of the sleeve portion or a lower surface of the outer rotating portion. A second dynamic pressure groove array is arranged in a surface of the outer rotating portion or a surface of the stationary bearing portion in a region between the first array and a liquid surface. An end of the second array closer to the liquid surface is arranged radially inward of an opposite end of the second array. An upper end opening of a communicating channel defined in the sleeve portion is arranged radially outward of a radially inner end of the first array.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.