Dynamic of Damage of Aircraft Engine High-speed Rolling-element Bearings Tested in Low-viscosity Model Mediums

Analysis of the results of studies in a low-viscosity model medium of high-speed ball bearings, racers and rolling elements made of corrosion-resistant 95H18Sh steel with a massive bronze separator on a special multipurpose installation was carried out.Water was used as the low-viscosity model medium in accordance with GOST 2874-82. The dynamics of damage formations on bearing working surfaces, depending on the level of load-velocity parameters and on the pumping rate of lubricoolant water medium, was demonstrated. A limit level of contact stresses was established, above which damages of working surfaces have a pitting character; while under contact stresses not exceeding this limit, working surfaces are exposed only to mechanochemical wear. Recommendations for developers of bearing assemblies on the ascertainment of permissible load levels on bearings in the design of rolling contact bearings were given.