Lubrication of 35-Millimeter-Bore Ball Bearings of Several Designs to 2.5. Million DN,
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER
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Parametric tests were conducted in a high-speed, high-temperature bearing tester using 35-mm-bore, angular-contact ball bearings with either a single- or double-outer-land-guided cage. The bearing had a nominal contact angle of 24 deg. The bearing was jet-lubricated with a 20 msec 66 ftsec jet velocity or had axial grooves and radial holes which permitted lubrication through the bearing inner ring. An outer-ring cooling oil flow rate maintained at 1700 cm3min 0.45 galmin at 394 K 250 deg F oil-inlet temperature was used in some tests. The distribution of the total oil supplied to the inner ring was 50 percent for lubrication of the rolling elements and 50 percent for inner-ring cooling in some tests. In other tests the distribution was 25 percent lubrication and 75 percent cooling. Test results for a bearing with identical dimensions and cage design.