Abstract
An oil and air lubrication system for ball bearings supporting a high speed spindle maintains friction losses and temperature rises in low level comparing with other lubrication systems, e.g., oil jet or oil mist lubrication. In this study, rotating speeds of the ball in an angular contact ball bearing lubricated by the oil and air lubrication system are observed in various oil supply rates. In addition, quasi-static model analysis of the ball motion is carried out. Experiments indicate that the angular velocity of the ball varies with the oil supply rate even at the constant spindle speed. Furthermore, the model analysis suggests that the ball angular velocity is considerably concerned with an inlet film thickness. From the both results, a relationship between a starvation factor in the ball-race contacts and the oil supply rate is derived for the ball bearing under the oil and air lubrication.
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