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首页> 美国政府科技报告 >Long Term Performance of a Retainerless Bearing Cartridge with an Oozing Flow Lubricator for Spacecraft Applications
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Long Term Performance of a Retainerless Bearing Cartridge with an Oozing Flow Lubricator for Spacecraft Applications

机译：具有用于航天器应用的渗流润滑器的无固定轴承盒的长期性能

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A hybrid bearing cartridge using two retainerless bearings and an oozing flow lubricator was operated in vacuum for 440 days. Conditions included: 12,000 rpm, room temperature, 31 N (7 lbf) preload, 0.52 GPa (75 ksi) mean Hertzian stress, 0.01 Pa vacuum level. Bearing races were made of 440C stainless steel and bearing balls were Si3N4. The lubricant was a polyalphaolefin (Nye 176 A). Bearing health was monitored by measuring shaft temperature, run down time, and power supply drop out voltage. Only minor changes in these parameters occurred throughout the test duration. Post test visual analysis of the bearings confirmed their excellent condition. About 2/3 of the original lubricant charge remained in the reservoir. Based on previous flow calculations and measurements, the estimated life for this cartridge is greater than 12 years of nominal operation.

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