Bearing with improved resistance to micropitting
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United States of America Patent
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Jun 6, 2017
Grant Date -
Apr 21, 2016
app pub date -
Feb 6, 2013
filing date -
Feb 6, 2013
priority date (Note) -
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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.
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