The Friction of Radially Loaded Hybrid Spindle Bearings under High Speeds

Friction losses are an important parameter for evaluating the operational behaviour of high-speed rolling bearings. Specifically, in machine tool applications, bearings subjected to high radial loads and speeds, which lead increased forces contact and, as a result, bearing friction. In this application, hybrid spindle bearings, typically made ceramic balls steel raceways, show better frictional compared full steel-made Therefore, precise knowledge friction characteristics can improve models generalise them with different types, geometries, operating conditions. article, new straightforward cost-efficient method measuring torque is presented. A rigidly arranged 7008 pair was tested up rotational speeds 24,000 rpm 3 kN. The effects oil–air grease lubrication discussed characteristic diagrams Then, based on test results, calculation model presented validated outer race control minimised power dissipation regarding influence forces.