Experimental Study of Cage Imbalance and Wear in Deep Groove Ball Bearing Under Cryogenic Environments

摘要

The cage whirling amplitude increased with an increase in the rotation speed up to 5,000 rpm for which the amplitude decreased with the increase in the speed up to 11,000 rpm. In addition, the amplitude of abnormal whirling increased with the increase in the rotating speed. The effects of the imbalance mass of cage were more pronounced at 11,000 rpm, in contrast to the case for the lower speed range. The wear loss of the cage bottom was larger than that of the cage top, because of the force acting on the bottom surface of the cage bottom owing to the instable motions of cage. Further, the wear loss of the cage was relatively larger than that of the metal elements, because the cage was made of PTFE. In addition, the total wear loss of the cage was the highest for a cage imbalance mass of 17.358 and 23.178 g.cm, owing to the increased number of intermittent collisions. The obtained experimental results highlighted the effects of the cage imbalance mass on the cage whirling motion and cage wear loss. In addition, the test results demonstrated that, for overly large cage imbalance mass, the cage instability decreased with an increase in the rotating speed of the inner race.