Influence of the Unequal Orbital Intervals of Balls on the NRRO of Rotational Frequency of the Cage in a Ball Bearing

摘要

The nonrepetitive runout (NRRO) of rotational frequency of a cage is caused mainly by the diameter differences of balls contained in one bearing. In addition, it was known that unequal orbital intervals of balls could influence the NRRO of the rotational frequency of the cage. There were few quantitative studies about this, however. In this work, we investigated the influence of unequal orbital intervals of balls on the NRRO of retainer rotation by pulling out balls intentionally. We clarified that the NRRO of rotational frequency of the cage became large if the difference between orbital intervals of balls was large.