A Rating Formula for Tapered Roller Bearings

This paper presents the rating formula used by The Timken Roller Bearing Company to determine the basic ratings for tapered roller bearings. A derivation of the formula is given. A resume of fatigue tests on 1760 bearings, representing 16 different series, provides experimental verification of the Timken bearing formula. These data are clearly in better agreement with the Timken Company rating formula than the rating method proposed by the American Standards Association.