Quote:
Originally Posted by JFP in PA
The theory on the DOF is the lack of lubrication causes heat build up, leading to galling and failure. As the dual row has twice the contact area, the heat build up in the bearing should be both faster and to a higher temp, which should be leading to its failure sooner than the single row. But that is not what happens in the real world, were single rows fail at a rate near ten times that of dual rows.
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I don`t think the contact area really matters here. The axial force on each ball is double in a single-row bearing as compared to a dual-row. The contact surface from the bearing ball`s point of view is identical in both single-row and dual-row. Heat dissipation is similar too, as it`s like putting two bearings next to each other. What is different, is the load. If the bearing was running completely dry, the dual row would still last longer.