Fluid bearing unit and lubricating oil composition for bearing
US6903056B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 23, 2002 |
| Grant date | Jun 7, 2005 |
| Priority date | — |
| Expiry date | Apr 15, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2380/26
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
There is provided a durable low-torque lubricating oil for bearings and fluid dynamic bearings, porous oil-impregnated bearings and hydrodynamic type porous oil-impregnated bearings suitable for use as bearings in small-sized spindle motors for information equipment. The lubricating oil composition comprising (A) a diester of a monovalent aliphatic alcohol containing 6-10 carbon atoms and a saturated aliphatic dicarboxylic acid containing 10 carbon atoms as base oil and (B) 3-20% by weight of a low-viscosity lubricating oil with a kinematic viscosity of less than 11 mm2/s at 40° C., a fluid dynamic pressure bearing unit or a porous oil-impregnated bearing unit containing said lubricating oil composition or a spindle motor provided with said bearing unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.