Recalibrated Equations for Determining Effect of Oil Filtration on Rolling Bearing Life

In 1991, Needelman and Zaretsky presented a set of empirically derived equations for bearing fatigue life (adjustment) factors (LFs) as a function of oil filter ratings. These equations for life factors were incorporated into the reference book, STLE Life Factors for Rolling Bearings (Zaretsky, 1992). These equations were normalized (LF = 1) to a 10-μm filter rating at βx = 200 (normal cleanliness) as it was then defined. Over the past 20 years, these life factors based on oil filtration have been used in conjunction with American National Standards Institute/American Bearing Manufacturers Association (ANSI/ABMA) standards and bearing computer codes to predict rolling bearing life. Additional experimental studies have been made by other investigators into the relationship between rolling bearing life and the size, number, and type of particle contamination. During this time period, filter ratings have also been revised and improved, and they now use particle counting calibrated to a new National Institute of Standards and Technology (NIST) reference material, NIST SRM 2806 (NIST 1997). This article reviews the relevant bearing life studies and describes the new filter ratings. New filter ratings, βx(c) = 200 and βx(c) = 1,000, are benchmarked to old filter ratings, βx = 200, and vice versa. Two separate sets of filter LF values were derived based on the new filter ratings for roller bearings and ball bearings, respectively. Bearing LFs can be calculated for the new filter ratings.

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