NASA Technical Reports Server (NTRS) 19840010586: Comparison of predicted and experimental thermal performance of angular-contact ball bearingsReport as inadecuate




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Predicted bearing heat generation and bearing temperature were verified by experimental data for ball bearings over a range of sizes, shaft speeds, and lubricant flow rates. The computer program Shaberth requires, as input, a factor which describes the air-oil mixture in the bearing cavity for calculation of the ball drag contribution to bearing he

Author: NASA Technical Reports Server (NTRS)

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NASA Technical Paper 2275 February 1984 Comparison of Predicted and Experimental Thermal Performance of AngularContact Ball Bearings Richard J.
Parker LOAN COPY: RETURY! TO AFWL TECHNICAL LIBRARY KIRTLAND AFB, N.M.
87117 ii NASA TECH LIBRARY KAFB, NM I NASA Technical Paper 2275 1984 Comparison of Predicted and Experimental Thermal Performance of AngularContact Ball Bearings Richard J.
Parker Lewis Research Center Cleveland, Ohio National Aeronautics and Space Administration Scientific and Technical Information Branch Summary The computer program Shaberth was used to calculate the thermal performance of ball bearings for which sufficient test data were available to make a comparison over a range of test conditions.
Three angular-contact ball bearings of differing sizes were selected.
The variables used for comparison of experimental and calculated data were bearing and oil-out temperatures and bearing heat generation.
An equation was derived based on this comparison for the lubricant percent volume in the bearing cavity XCAV as a function of lubricant flow rate through the cavity, shaft speed, and bearing pitch diameter.
The predicted bearing heat generation, inner- and outer-race temperatures, and oilout temperatures agreed very well with the experimental data obtained from three sizes of ball bearings (35-, 120-, and 167-mm bore) over a speed range from 1.0 to 3.0 million DN.
This agreement provides experimental verification of thermal performance prediction capabilities of Shaberth. The equation derived for the lubricant percent volume in the bearing cavity XCAV appears to be valid over the range of shaft speeds and lubricant flow rates for the three bearing sizes investigated.
The predicted trends of increasing temperature and heat generation with increased shaft speed and of decreasing temperature and increasing heat generation with increased lubricant flow rate were verified by the experimental data. Introduction Rolling-element bearing life and p...






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