B3 数値シミュレーションによる宇宙機器用玉軸受の保持器不安定現象に関する研究

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  • B3 A Numerical Study on Retainer Instability of Ball Bearings for Space-Use

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A performance of ball bearing used in reaction wheel toward retainer instability was investigated by numerical simulation. The dynamic simulation of ball bearing showed that the retainer instability occured easily when the friction coefficient at retainer-ball was higher than 0.3. Meanwhile, the mixed lubrication analysis clarified the friction coefficient at retainer-ball kept lower than 0.2 even if oil amount increased under reaction wheel 6000 rpm operation. Combining these results the reaction wheel bearing countered the retainer instability was demonstrated.

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