Rolling bearings — Explanatory notes on ISO 281 — Part 1: Basic dynamic load rating and basic rating life

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Part 1: Basic dynamic load rating and basic rating life由国际标准化组织(International Organization for Standardization,简称ISO)于2021-05发布,适用于全球范围。

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Part 1: Basic dynamic load rating and basic rating life
Part 1: Basic dynamic load rating and basic rating life(截图)

 

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TECHNICAL REPORT ISO/TR 1281-1:2021(E)

Rolling bearings — Explanatory notes on ISO 281 —

Part 1: Basic dynamic load rating and basic rating life

1 Scope

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 a nd definiti ons

For the purposes of this document, the terms and definitions given in ISO 281:2007 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://w ww .iso .org/o bp

— IEC Electropedia: available at http:// www .electropedia .org/ 4 Symbols

A constant of proportionality

A constant of proportionality determined experimentally

1

B constant of proportionality determined experimentally

1

C basic dynamic radial load rating of a rotating ring

1

C basic dynamic radial load rating of a stationary ring

2

C basic dynamic axial load rating for thrust ball or roller bearing

a

C basic dynamic axial load rating of the rotating ring of an entire thrust ball or roller bearing

a1

C basic dynamic axial load rating of the stationary ring of an entire thrust ball or roller bearing

a2

C basic dynamic axial load rating as a row k of an entire thrust ball or roller bearing

ak

C basic dynamic axial load rating as a row k of the rotating ring of thrust ball or roller bearing

a1k

C basic dynamic axial load rating as a row k of the stationary ring of thrust ball or roller bearing

a2k

ISO/TR 1281-1:2021(E)

C basic dynamic load rating for outer ring

e

C basic dynamic load rating for inner ring

i

C basic dynamic radial load rating for radial ball or roller bearing

r

D pitch diameter of ball or roller set

pw

D ball diameter

w

D mean roller diameter

we

E modified modulus of elasticity

o

F axial load

a

F radial load

r

J factor relating mean equivalent load on a rotating ring to Q

1 max

J factor relating mean equivalent load on a stationary ring to Q

2 max

J axial load integral

a

J radial load integral

r

L bearing life

L basic rating life

10

L effective contact length of roller

we

L L per row k

wek we

N number of stress applications to a point on the raceway

P dynamic equivalent axial load for thrust bearing

a

P dynamic equivalent radial load for radial bearing

r

P dynamic equivalent radial load for the rotating ring

r1

P dynamic equivalent radial load for the stationary ring

r2

Q normal force between a rolling element and the raceways

Q rolling element load for the basic dynamic load rating of the bearing

C

Q rolling element load for the basic dynamic load rating of a ring rotating relative to the applied load

C1

Q rolling element load for the basic dynamic load rating of a ring stationary relative to the applied C2

load

Q maximum rolling element load

max

S probability of survival, reliability

V volume representative of the stress concentration

V rotation factor

f

X radial load factor for radial bearing

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