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ISO/TR 1281-1 pdf free download

ISO/TR 1281-1-2021 pdf free download.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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 281:2007 Rolling bearings — Dynamic load ratings and rating life
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 28 1:2007 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://wwwisoorg/obp
— IEC Electropedia: available at http;//www.electnwcIiiiirJ
4 Symbols
A constant of proportionality
A1 constant of proportionality determined experimentally
constant of proportionality determined experimentally
C1 basic dynamic radial load rating of a rotating ring
C2 basic dynamic radial load rating of a stationary ring
Ca basic dynamic axial load rating for thrust ball or roller bearing
C1 basic dynamic axial load rating of the rotating ring of an entire thrust ball or roller bearing
C2 basic dynamic axial load rating of the stationary ring of an entire thrust ball or roller bearing
Cak basic dynamic axial load rating as a row k of an entire thrust ball or roller bearing
Calk basic dynamic axial load rating as a row k of the rotating ring of thrust ball or roller bearing
Calk basic dynamic axial load rating as a row k of the stationary ring of thrust ball or roller bearing
Xa radial load factor for thrust bearing Y axial load factor for radial bearing
axial load factor for thrust bearing
Z number of balls or rollers per row
number of balls or rollers per row k
a semimajor axis of the projected contact ellipse
a1 life adjustment factor for reliability
b semiminor axis of the projected contact ellipse
c exponent determined experimentally compression constant
e measure of life scatter, i.e. Weihull slope determined experimentally
e limiting value of F / Fr for the applicability of different values of factors X and Y in the new edition
factor which depends on the geometry of the bearing components, the accuracy to which the various components are made, and the material
h exponent determined experimentally
I number of rows of balls or rollers
I circumference of the raceway
r cross-sectional raceway groove radius.ISO/TR 1281-1 pdf download.

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