Hydrodynamic bearing device and compact motor including hydrodynamic bearing device
US7371010B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2005 |
| Grant date | May 13, 2008 |
| Priority date | — |
| Expiry date | Aug 30, 2026 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2370/12
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A shaft is rotatably inserted through a bearing hole of a sleeve, a screw hole for fastening a clamp to the shaft is formed along a direction of an axis from an upper end portion of the shaft, an operating fluid is charged in a gap between an inner peripheral surface of the sleeve and an outer peripheral surface of the shaft, and radial bearing parts constituted of dynamic pressure generating grooves are provided on the inner peripheral surface of the sleeve. As for an inside diameter of the sleeve, an inside diameter in a predetermined range from the opening upper end part is formed to be larger by an expected deformation amount in a diameter direction of the shaft than an inside diameter in a range at a lower end side from the predetermined range. The predetermined range corresponds to a range including a radial bearing part located at the upper end side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.