Study on the EHL behavior and mechanism under quantitative supply conditions

In most cases, rolling bearings work under limited oil supply conditions, where the elastohydrodynamic lubrication (EHL) characteristics of the contact can significantly differ from that observed under fully flooded lubrication conditions. Using a ball-on-ring test rig, we systematically investigated film thickness evolution across a wide velocity range (up to 12.5 m/s) under quantitative oil supply conditions. Experimental results reveal that, under quantitative supply, when the velocity surpasses a critical velocity threshold, the contact transits from fully flooded lubrication to the starvation state, accompanied by film thickness reduction and progressive decrease of the distance between the meniscus and the contact center. Furthermore, at high speeds, the centrifugal force enhances oil replenishment on the free surface.