A new type of rolling contact damage was found out in the fatigue tests of the deep groove ball bearings #6206 under pure radial load and grease lubrication. In appearance, the damages had a few cracks at perpendicular to the ball revolution direction, sank about 20 μ m in the surface of rolling raceway, happened only in the raceway of stationary races and surface of balls, and distributed widely within loaded zone. And in the cross section there were a lot of cracks propagated at 60∼80 degrees to the rolling surface at not only damage position but also other parts. The cracks at the damage position just opened to the surface. It is supposed that the damages are caused by rolling contact fatigue and metal to metal contacts due to lubricant starvation under grease lubrication.

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