Large-Bore Tapered-Roller Bearing Performance and Endurance to 2.4 Million DN,
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER
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The performance and endurance life of 120.65-mm 4.75-in. bore tapered-roller bearings of two designs were investigated under heavy combined radial and thrust loads. Performance tests were run up to 15 000 rpm with the modified standard design bearing and to 20 000 rpm with the computer optimized design bearing. Temperature distribution and bearing heat generation were determined as functions of shaft speed, radial and thrust loads, lubricant flow rate, and lubricant inlet temperature. Lubricant was supplied to the test bearings either by jets or through holes in the cone to the undercuts at the edges of the raceway.