Abstract:Aimed at the lubrication failure problem of high speed rotor bearing in space environment,a unified model of mixed lubrication analysis for angular contact ball bearings was established,considering the influence of contact geometry,real rough surface morphology,elastic deformation,rheological properties of lubricant and highspeed spin characteristics.Based on the model,the influences of rotating speed,load,vacuum,high and low temperature on bearing microdrive interface contact and lubrication characteristics were analyzed,and the critical rotate speed for conversion among various lubrication states was given according to an example.The conclusions include that,with the increase of speed,the lubrication state in the contact interface of bearing is gradually improved;The pressure peak in the contact interface of bearing is increased as the load rises overall except at the extremely low rotate speed;As the atmospheric pressure increases,the film thickness is increased while the pressure peak of interface is decreased;The film thickness is decreased as the temperature increases and as the rotate speed rises;Under the low speed condition,the inlet oil starvation caused by centrifugal force and microgravity has minor effects on lubrication properties.