Bearing with improved resistance to micropitting
US9670959B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2013 |
| Grant date | Jun 6, 2017 |
| Priority date | — |
| Expiry date | Feb 6, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49684
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A bearing comprising a plurality of rolling elements arranged between an inner and outer raceway thereof. A rolling contact interface is between a first rolling contact surface on at least one rolling element and a second rolling contact surface formed by one of the inner and outer raceways. The first rolling contact surface has a first RMS roughness Rq1 and a first roughness pattern γ1, expressed in terms of the Peklenik number γ. The second rolling contact surface has a second RMS roughness Rq2 and a second roughness pattern γ2. To minimize micropitting in the bearing, the rolling contact interface has a surface topography wherein (a) the roughness pattern of the first and second rolling contact surfaces are oriented in the direction of rolling, whereby γ1≧3.0 and γ2≧10.0; and (b) the first and of the second rolling contact surfaces have substantially equal roughness heights, whereby 0.8≦Rq1/Rq2≦1.25.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.