A 75-millimeter-bore (size 215) cylindrical-roller inner-raceriding cage-type bearing was used in an experimental investigation of the effect of oil viscosity on bearing operating characteristics over a range of DN values (bearing bore in ram times shaft speed in rpm) from 0.3X10" to 1.2Xlo6. Kinematic viscosity at the inlet temperatures varied from 1.7 to 390 centistokes (absolute viscosities of 2.0X10-7 to 470X10-7 reyns).nA previously developed cooling-correlation analysis was extended to include fully the effect of varying lubricant viscosity. This improved correlation makes it possible to predict either the inner- or the outerrace bearing temperatures from single curves regardless Of whether speed, load, oil flow, oil inlet temperature, oil inlet viscosity, oil-jet diameter, or any combination of these parameters is varied over wide ranges.
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