ISO/TR 1281-1:2021
Rolling bearings — Explanatory notes on ISO 281 — Part 1: Basic dynamic load rating and basic rating life
This document specifies supplementary background information regarding the derivation of mathematical expressions and factors given in ISO 281:2007.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 General
6 Basic dynamic load rating
6.1 General
6.2 Basic dynamic radial load rating, Cr, for radial ball bearings
6.3 Basic dynamic axial load rating, Ca, for single row thrust ball bearings
6.3.1 Thrust ball bearings with contact angle α ≠ 90°
6.3.2 Thrust ball bearings with contact angle α = 90°
6.4 Basic dynamic axial load rating, Ca, for thrust ball bearings with two or more rows of balls
6.5 Basic dynamic radial load rating, Cr, for radial roller bearings
6.6 Basic dynamic axial load rating, Ca, for single row thrust roller bearings
6.6.1 Thrust roller bearings with contact α ≠ 90°
6.6.2 Thrust roller bearings with contact angle α = 90°
6.7 Basic dynamic axial load rating, Ca, for thrust roller bearings with two or more rows of rollers
7 Dynamic equivalent load
7.1 Expressions for dynamic equivalent load
7.1.1 Theoretical dynamic equivalent radial load, Pr, for single row radial bearings
7.1.2 Theoretical dynamic equivalent radial load, Pr, for double row radial bearings
7.1.3 Theoretical dynamic equivalent radial load, Pr, for radial contact groove ball bearings
7.1.4 Practical expressions for dynamic equivalent radial load, Pr, for radial bearings with constant contact angle
7.1.5 Practical expressions for dynamic equivalent radial load, Pr, for radial ball bearings
7.1.6 Practical expressions for dynamic equivalent axial load, Pa, for thrust bearings
7.2 Factors X, Y and e
7.2.1 Radial ball bearings
7.2.2 Values of X, Y and e for each type of radial ball bearing
7.2.3 Tabulation of factors X, Y and e for radial ball bearings
7.2.4 Calculated values of Y and e different from standard
7.2.5 Thrust ball bearings
7.2.6 Radial roller bearings
7.2.7 Thrust roller bearings
8 Basic rating life
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 General
6 Basic dynamic load rating
6.1 General
6.2 Basic dynamic radial load rating, Cr, for radial ball bearings
6.3 Basic dynamic axial load rating, Ca, for single row thrust ball bearings
6.3.1 Thrust ball bearings with contact angle α ≠ 90°
6.3.2 Thrust ball bearings with contact angle α = 90°
6.4 Basic dynamic axial load rating, Ca, for thrust ball bearings with two or more rows of balls
6.5 Basic dynamic radial load rating, Cr, for radial roller bearings
6.6 Basic dynamic axial load rating, Ca, for single row thrust roller bearings
6.6.1 Thrust roller bearings with contact α ≠ 90°
6.6.2 Thrust roller bearings with contact angle α = 90°
6.7 Basic dynamic axial load rating, Ca, for thrust roller bearings with two or more rows of rollers
7 Dynamic equivalent load
7.1 Expressions for dynamic equivalent load
7.1.1 Theoretical dynamic equivalent radial load, Pr, for single row radial bearings
7.1.2 Theoretical dynamic equivalent radial load, Pr, for double row radial bearings
7.1.3 Theoretical dynamic equivalent radial load, Pr, for radial contact groove ball bearings
7.1.4 Practical expressions for dynamic equivalent radial load, Pr, for radial bearings with constant contact angle
7.1.5 Practical expressions for dynamic equivalent radial load, Pr, for radial ball bearings
7.1.6 Practical expressions for dynamic equivalent axial load, Pa, for thrust bearings
7.2 Factors X, Y and e
7.2.1 Radial ball bearings
7.2.2 Values of X, Y and e for each type of radial ball bearing
7.2.3 Tabulation of factors X, Y and e for radial ball bearings
7.2.4 Calculated values of Y and e different from standard
7.2.5 Thrust ball bearings
7.2.6 Radial roller bearings
7.2.7 Thrust roller bearings
8 Basic rating life
Bibliography