Detection and Analysis of Degraded Grease for EMU Axle Box Bearings

Aimed at that a part of EMU axle box bearings has a high working temperature,and the grease degrade and even shows a black color after operation. The original grease and degraded grease after use are detected and compared.The influence of detecting couplant and rust inhibitor during detecting process for hollow shaft is considered,the mixed grease is designed with different doping types of original grease,detecting couplant and rust inhibitor. The physical and chemical properties and element content are tested. The infrared spectroscopy and element content of grease are researched,and the analysis conclusions are given.