洁净真空与失重和超重环境滚动轴承的设计与试验

Design of Overweight and Weightlessness,Clean and Vacuum Special Environments of Rolling Bearings with Ferrofluid

基于磁性流体不能旋转密封其它液体,但应能够旋转密封磁性流体本身的构思,研制磁性流体润滑和密封的滚动轴承。利用含10%纳米Fe3O4的聚α-烯烃合成油(PAO)基磁性流体的优良润滑性能,在实验测试的基础上,选择高粘度的25w/50聚α-烯烃合成油基磁性流体代替滚动轴承的润滑脂。利用磁性流体离心式转动密封具有零泄漏和极低磨损微粒排放的优异密封性能,在计算分析和结构优化设计的基础上,选择低粘度的5w/30聚α-烯烃合成油基磁性流体作为离心式密封介质,用磁性流体离心式转动密封代替滚动轴承的橡胶密封。试验表明:这种离心式磁性流体转动密封的滚动轴承有效地减少了润滑剂的散失和磨损微粒的排放,适用于洁净、真空、失重和超重的特殊环境。

Although ferrofluid can＇t realize rotating sealing other fluid, it does can fulfill rotating sealing itself. Grounded on this new idea, we actualized the rolling bearings lubricated and sealed with ferrofluid. Based on the excellent lubricating property of Poly- α -olefin（PAO） with 10% nano-Fe3O4, we used the 25w/50 PAO as lubricant of rolling bearings instead of normally lubricating greases. With analytical calculations and optimal design of mechanism, we select low viscosity, 5w/30 PAO as sealing medium, centrifugally rotary seal of rolling bearings utilizing ferrofluid was used instead of rubber sealing because of its nil leak and little wear debris generation. Experiments proved that this kind of rolling bearings effectively reduced lubricant evaporation loss and wear debris generation as well and it could find promising application in overweight and weightlessness, clean and vacuum environment.