滚动轴承油气润滑及喷油润滑温度场对比研究

Comparing Study on Temperature Field of Rolling Bearing under Oil-air Lubrication and Spray Lubrication

分析滚动轴承内部生热机制,计算不同转速下油气润滑和喷油润滑的轴承滚道表面对流换热系数;应用Workbench流场分析模块,建立滚动轴承流体域几何模型,对不同转速下滚动轴承油气润滑和喷油润滑时轴承腔热流耦合温度场进行仿真分析。结果表明,当轴承转速较低时,油气润滑和喷油润滑时轴承腔最高温度基本相同,但油气润滑条件下轴承腔的整体温度远远低于喷油润滑方式;当轴承转速较高时,油气润滑条件下的轴承腔最高温度要远远低于喷油润滑条件下的轴承腔最高温度,从而验证了高速工况下油气润滑的优越性。

The heat generating mechanism inside the cavity of the rolling bearing was analyzed and the convective heat transfer coefficient of the bearing raceway surface in different rotation speed was calculated under oil-air lubrication and spray lubrication. The fluid domain geometry model of the deep groove ball bearing SKF6208 was established by using the flow field module in Workbench. The temperature field in the cavity of rolling bearing under oil-air lubrication and spray lubrication was simulated in different rotation speed. The simulation results show that, at lower bearing rotational speed, the highest temperature in the bearing cavity under oil-air lubrication is almost the same as that under spray lubrication, but the whole temperature in the bearing cavity under oil-air lubrication is lower than that under spray lubrication. At higher bearing rotational speed, the highest temperature in the bearing cavity under oil-air lubrication is far lower than that under spray lubrication. Those conclusions verify the advantages of oil-air lubrication in high rotation speed.