Spindle motor including hydrodynamic bearing and storage disk drive including same
US8520335B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 2011 |
| Grant date | Aug 27, 2013 |
| Priority date | — |
| Expiry date | Oct 13, 2031 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2370/12
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In a motor, a stationary portion includes a shaft portion and an upper thrust portion arranged to define a single continuous monolithic member together with the shaft portion, and arranged to extend radially outward from an upper portion of the shaft portion. The shaft portion includes a female screw portion recessed axially downward from an upper end thereof. An upper end of the single continuous monolithic member defined by the shaft portion and the upper thrust portion includes an upper end annular surface arranged to extend radially outward from the female screw portion perpendicularly or substantially perpendicularly to the central axis. An outside diameter of the upper end annular surface is greater than a diameter of an outer circumferential surface of the shaft portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.