KEYWORDS

Rolling Element Bearings, Traction, Thermal Effects in Hydrodynamics

ADORE VALIDATION OF BEARING HEAT GENERATION FOR A 133-MM ANGULAR CONTACT BALL BEARING

ADORE predictions of bearing heat generation are compared with experimental data obtained with a 133mm bore ball bearing for various loads and speeds. The bearing uses MIL-L-23699 type lubricant and traction, churning, and drag models are considered in predictions. Predictions agree well with experimental data. While most of heat generation is due to churning at light loads, traction becomes equally significant at high loads. At very high loads and speeds the Newtonian elastohydrodynamic traction model demonstrates a high traction slope in the low slip region and a relatively fast drop off at high slip rates. Due to such effects the prediction of heat generation is somewhat higher than that observed. In absence of experimental traction data at such extreme conditions, such a behavior has been questionable. Therefore, the deviation between experimental data and analytical predictions at very high loads and speeds is correlated to uncertainties in the lubricant traction model.

AUTHORS

Brian D. Nicholson, Justin Mason, Garry Givan, Kevin Thompson, Air Force Research Laboratory, Wright Patterson AFB, OH, Hitesh Trivedi, UES, Inc., Dayton, OH and Pradeep Gupta, PKG, Inc., Clifton Park, NY