摘要
以角接触球轴承为研究对象,采用FLUENT流体计算软件对高速滚动轴承环间气相介质的状态进行数值模拟,获得了环间气流速度场和压力场的分布特性,揭示了轴承转速对环间气相介质流动状态的影响规律。结果表明:内圈小端面气流的切向速度符合腔型/旋转结构中气相介质的运动规律;由于小端面湍流强度较小,且靠近外圈有涡存在,因此靠近内圈喷油更利于润滑油的进入,从而可确定最佳喷油位置位于该端面无量纲径向坐标0.25处;随着转速增大,轴承环间气流周向压力值两极化变得越明显,压力分布无明显迁移,轴承环间存在利于润滑油贴滚道运动的气流径向作用力。该研究结果为开展高速滚动轴承喷油润滑油液的穿透机理提供了更真实的边界条件和初值。
The angular contact ball bearing was set as the object. The state of gas phase medium between high-speed rings was simulated using FLUENT software. The airflow velocity and pressure field characteristics between the rings were obtained,as well as the influence rule of the bearing rotating speed on the gas phase medium fluent state between rings. The results indicated that the tangential speed of the airflow at the small end face of inner ring conformed to the motion rule in the chamber-rotating structure. It was more beneficial to inject the lubricating oil nearby the inner ring because of lower turbulence intensity and vortexes closed to out ring. The best location of oil injection was the dimensionless radial coordinate 0.25 of the small end face. With the increase of revolving speed, the polarization of the airflow circumferential pressure between the rings was more obvious. The migration of pressure distribution was inconspicuous. The airflow radial force facilitating the adhered motion of lubricating oil to the rollaway nests existed between rings. The above results provided more real boundary conditions and initial values for the research of the penetration mechanism of injecting lubricant oil in the high-speed rolling bearings.
出处
《机械设计》
CSCD
北大核心
2016年第6期61-66,共6页
Journal of Machine Design
基金
国家自然科学基金资助项目(U1404517)
河南省教育厅科学技术研究重点资助项目(14A460009)
河南科技大学自然科学重大预研资助项目(2013ZCX007)
关键词
滚动轴承
喷油润滑
气相介质
切向速度
rolling bearing
injecting lubrication
gas phase medium
tangential speed
