Research On Solid Lubrication Angular Contact Ceramic Bearing Of Electrical Servo System

To meet the requirement of harsh environment, solid lubricated ceramic ball bearings are widely applied in the fields of aerospace and industrial owing to their superiority of friction properties. The solid lubrication ceramic bearings, which are continually lubricated by cage, are always in the excellent lubrication condition. Based on the oil-free lubrication rolling bearings which are used in an electrical servo system of an aerospace research institute, solid lubrication angular contact ceramic bearings are designed in this dissertation. To simulate working conditions, the test equipment is designed and the experiments are made. The fault tree of the bearing failure modes is established, and the failure causes are analyzed.Based on the requirement of the electrical servo system to the bearings, the solid lubrication angular contact ceramic bearing is designed. The 9Cr18 is chosen as the material of bearing enclose. The complex material, PTFE as the substrate and polybenzoate and aramid fiber as the addition, is utilized as the cage material. The guide clearance, which is the primal design parameter of the solid lubrication, is designed. In the vacuum environment, the friction coefficient is very low and steady when the cage material is matching with 9Cr18 and ceramic. And this experiment replace the bearing testing in the vacuum environment.Based on the working conditions of the electrical servo system, the experimental bench in the low and normal temperature is designed. And the working condition simulation testing is made by the experimental bench. The friction moment of the tested bearing is tested by the BRG-3000. The change of the friction moment is analyzed.The failure modes of the solid lubrication bearing are analyzed. The reliability model of the solid lubrication bearing system is established. Based on the previous working base, the fault tree of the solid lubr ication bearing system is built. Every step of the solid lubrication bearing is analyzed. And based on the primal failure modes of the solid lubrication bearing, the improvement actions are proposed.