Lubricant composition, speed reduction gear using the lubricant composition, and electric power steering apparatus using the speed reduction gear
US8039423B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 23, 2005 |
| Grant date | Oct 18, 2011 |
| Priority date | — |
| Expiry date | Jul 5, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/19991
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disclosed are a lubricant composition including a lubricating base oil, fine particles and a calcium sulfonate-based thickener, a speed reduction gear filled with the lubricant composition, and an electric power steering apparatus including the speed reduction gear. The invention reduces operating noise of the speed reduction gear, regardless of the amount of backlash that occurs on combining a small gear and a large gear and without a more complicated structure for the speed reduction gear, by action of the fine particles. Further, separation of oil is prevented, by action of the calcium sulfonate-based thickener of the lubricant composition, so that electric power steering apparatus noise within the inside of a car is reduced at a low cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.