Hydrodynamic bearing and spindle motor
US6552455B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 2001 |
| Grant date | Apr 22, 2003 |
| Priority date | — |
| Expiry date | Feb 9, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K7/09
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Provided is a durable spindle motor with a precise rotation but free from a shaft vibration, a decrease of rotation accuracy or a contact due to a swing during rotation. A shaft (11) is inclined relative to a sleeve (12) by an external biasing force, generating and then utilizing a hydrodynamic pressure generated during the rotation. The sleeve (12) has a central cylindrical section (C) extending parallel to the axis and two tapered sections (A), (B) each connect(d with the cylindrical section (C) at its opposite ends and enlarged outwardly, so that a dynamic force is generated between the tapered sections (A), (B) and the shaft (11). Preferably, an inclination of the tapered sections (A), (B) is identical to that of the shaft (11), and lengths of the tapered sections (A), (B) is one fourth of that of the sleeve (12). Similar advantages can be attained in an arrangement in which the sleeve (12) is defined in the form of cylinder while the shaft (11) is defined at its peripheral center with cylindrical section (c) and at its opposite ends with tapered sections (a), (b).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.