복합하중을 받는 각접촉 볼베어링을 위한 개선된 피로수명식

Abstract

Rolling bearing fatigue life is an essential criterion in industrial equipment design and manufacturing and requires precisemaintenance and replacement predictions. ISO/TS 281:2007 and 16281:2008 are commonly used for angular contact ballbearing (ACBB) fatigue life calculations, but they do not account for the characteristics of individual bearing elements undercombined loading conditions. This study proposes an enhanced formula for calculating fatigue life modification factors thatconsiders individual element-specific contact loads and resulting film thickness variations. The proposed fatigue life formulaprovides longer life predictions than the conventional method of determining modification factors based solely on maximumcontact loads. This difference is particularly noticeable in low-speed and/or heavy-loading applications. Analysis conductedusing the proposed fatigue life formula on various factors affecting fatigue life revealed that fluid kinetic viscositycoefficients, temperature-associated density changes, and changes in radial loads and rotational speeds could significantlyimpact the fatigue life of ACBBs. The proposed fatigue life formula is expected to increase the accuracy of ACBB fatiguelife predictions.