SIST ISO 76:2001/AMD1:2001

Annex A (informative) -- Discontinuities in the calculation of basic static load ratings

Annexe A (informative) -- Discontinuités dans le calcul des charges statiquesde base

Kotalni ležaji - Statične nosilnosti - Dopolnilo 1: Dodatek A (informativni) - Različnosti pri izračunu imenske statične nosilnosti

General Information

• Status: Withdrawn
• Publication Date: 30-Jun-2001
• Withdrawal Date: 10-Feb-2015
• ICS: 21.100.20 - Rolling bearings
• Technical Committee: ISEL - Mechanical elements
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 28-Jan-2015
• Due Date: 20-Feb-2015
• Completion Date: 11-Feb-2015
• Ref Project: ISO 76:1987/Amd 1:1999 - Rolling bearings — Static load ratings — Amendment 1: Annex A (informative) — Discontinuities in the calculation of basic static load ratings

Relations

• Replaced By: SIST ISO 76:2006 - Rolling bearings -- Static load ratings
• Effective Date: 01-Dec-2006
• Child: ISO 76:1987 - Rolling bearings — Static load ratings
• Effective Date: 14-Aug-2008
• Child: SIST ISO 76:2001 - Rolling bearings -- Static load ratings
• Effective Date: 12-May-2008
• Amends: SIST ISO 76:2001 - Rolling bearings -- Static load ratings
• Effective Date: 06-Jun-2022

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 76
Second edition
1987-02-01
AMENDMENT 1
1999-11-15
Rolling bearings — Static load ratings
AMENDMENT 1: Annex A (informative) —
Discontinuities in the calculation of basic static
load ratings
Roulements — Charges statiques de base
AMENDEMENT 1: Annexe A (informative) — Discontinuités dans le calcul
des charges statiques de base
A
Reference number
ISO 76:1987/Amd.1:1999(E)

---------------------- Page: 1 ----------------------
ISO 76:1987/Amd.1:1999(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
Amendment 1 to ISO 76:1987 was prepared by Technical Committee ISO/TC 4, Rolling bearings, Subcommittee
SC 8, Load ratings and life. It constitutes a possibility of more accurately calculating and comparing static load
ratings for radial and thrust angular contact ball bearings.
Amendment 1 to ISO 76:1987 comprises annex A to ISO 76:1987 and is for information only.
©  ISO 1999
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet [e-mail]
Printed in Switzerland
ii

---------------------- Page: 2 ----------------------
© ISO
ISO 76:1987/Amd.1:1999(E)
Rolling bearings — Static load ratings
AMENDMENT 1: Annex A (informative) — Discontinuities in the
calculation of basic static load ratings
A.1  Discontinuities in the calculation of basic static load ratings for radial and thrust
angular contact ball bearings
The factors used for calculation of basic static load ratings C and C according to ISO 76 are slightly different for
0r 0a
radial and thrust angular contact ball bearings.
Therefore there is a discontinuity in the calculated static axial load rating ( ) when a bearing with the contact
C
0a
angle a = 45° is first regarded as a radial bearing (C = C /Y ) and then as a thrust bearing.
0a 0r 0
This annex explains why the load rating factors are different, and shows how the load ratings can be re-calculated
in order to bring about correct comparisons under the same conditions.
A.2  Symbols
The same symbols are used as in ISO 76:1987. Additional symbols are:
C is the adjusted basic static axial load rating for a radial bearing (a < 45°), in newtons;
0ar
C is the adjusted basic static axial load rating for a thrust bearing (a . 45°), in newtons;
0aa
r is the cross-sectional raceway groove radius of inner ring, in millimetres;
i
r is the cross-sectional raceway groove radius of outer ring, in millimetres.
e
A.3  Different factors for calculating the static load rating for radial and thrust angular
contact ball bearings
Angular contact thrust ball bearings
In the calculation of C the osculations between balls and raceways are
0a
r /D < 0,54 and r /D < 0,54
i w e w
Angular contact radial ball bearings
In the calculation of C the osculations between balls and raceways are
0r
r /D < 0,52 and r /D < 0,53
i w e w
1

---------------------- Page: 3 ----------------------
© ISO
ISO 76:1987/Amd.1:1999(E
...

NORME ISO
INTERNATIONALE 76
Deuxième édition
1987-02-01
AMENDEMENT 1
1999-11-15
Roulements — Charges statiques de base
AMENDEMENT 1: Annexe A (informative) —
Discontinuités dans le calcul des charges
statiques de base
Rolling bearings — Static load ratings
AMENDMENT 1: Annex A (informative) — Discontinuities in the calculation
of basic static load ratings
A
Numéro de référence
ISO 76:1987/Amd.1:1999(F)-

---------------------- Page: 1 ----------------------
ISO 76:1987/Amd.1:1999(F)
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux de
normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est en général confiée aux
comités techniques de l'ISO. Chaque comité membre intéressé par une étude a le droit de faire partie du comité
technique créé à cet effet. Les organisations internationales, gouvernementales et non gouvernementales, en
liaison avec l'ISO, participent également aux travaux. L'ISO collabore étroitement avec la Commission
électrotechnique internationale (CEI) en ce qui concerne la normalisation électrotechnique.
Les projets de Normes internationales adoptés par les comités techniques sont soumis aux comités membres pour
vote. Leur publication comme Normes internationales requiert l'approbation de 75 % au moins des comités
membres votants.
L'Amendement 1 à l'ISO 76:1987 a été élaboré par le comité technique ISO/TC 4, Roulements, sous-comité SC 8,
Charges de base et durée. Il constitue une possibilité pour calculer et comparer plus précisément les charges
statiques de base des roulements (radiaux) et des butées à contact oblique.
L'Amendement 1 à l'ISO 76:1987 consiste en l'annexe A à cette Norme internationale, qui est donnée uniquement à
titre d’information.
©  ISO 1999
Droits de reproduction réservés. Sauf prescription différente, aucune partie de cette publication ne peut être reproduite ni utilisée sous quelque
forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les microfilms, sans l'accord écrit de l'éditeur.
Organisation internationale de normalisation
Case postale 56 • CH-1211 Genève 20 • Suisse
Internet [e-mail]
Imprimé en Suisse
ii

---------------------- Page: 2 ----------------------
© ISO ISO 76:1987/Amd.1:1999(F)
Roulements — Charges statiques de base
AMENDEMENT 1: Annexe A (informative) — Discontinuités dans le
calcul des charges statiques de base
A.1  Discontinuité dans le calcul des charges statiques de base des roulements à billes
(radiaux) et des butées à billes à contact oblique
Les facteurs utilisés pour le calcul des charges statiques de base C et C , conformément à l'ISO 76, sont
0r 0a
légèrement différents pour les roulements à billes (radiaux) et les butées à billes à contact oblique.
Cependant, il existe une discontinuité dans les charges axiales statiques calculées (C ) quand un roulement avec
0a

un angle de contact a = 45° est considéré soit comme un roulement radial (C = C /Y ), soit comme une butée.
0a 0r 0
La présente annexe explique pourquoi les facteurs de charge sont différents, et comment les charges peuvent être
recalculées, afin de pouvoir effectuer des comparaisons dans les mêmes conditions.
A.2  Symboles
Les symboles sont les mêmes que ceux utilisés dans l'ISO 76:1987. Les symboles supplémentaires sont:
C est la charge axiale statique de base ajustée pour un roulement radial (a < 45°), en newtons;
0ar
C est la charge axiale statique de base ajustée pour une butée (a . 45°), en newtons;
0aa
r est le rayon de courbure du chemin de roulement de la bague intérieure en section transversale, en
i
millimètres;
r est le rayon de courbure du chemin de roulement de la bague extérieure en section transversale, en
e
millimètres.
A.3  Différents facteurs de calcul de la charge statique de base des roulements à billes
(radiaux) et des butées à billes à contact oblique
Butées à billes à contact oblique

Dans le calcul de C , les osculations entre les billes et les chemins sont
0a
r /D < 0,54 et r /D < 0,54
i w e w
1

---------------------- Page: 3 ----------------------
© ISO
ISO 76:1987/Amd.1:1999(F)
Roulement radial à contact oblique
Dans le calcul de C , les osculations entre les billes et les chemins sont
0r
r /D < 0,52 et r /D < 0,53
i w e w
C C
A.4  Comparaison des charges axiales statiques de base ajustées, et , pour
0ar 0aa

roulements à
...

SLOVENSKI STANDARD
SIST ISO 76:2001/AMD1:2001
01-julij-2001
.RWDOQLOHåDML6WDWLþQHQRVLOQRVWL'RSROQLOR'RGDWHN$LQIRUPDWLYQL
5D]OLþQRVWLSULL]UDþXQXLPHQVNHVWDWLþQHQRVLOQRVWL
Annex A (informative) -- Discontinuities in the calculation of basic static load ratings
Annexe A (informative) -- Discontinuités dans le calcul des charges statiquesde base
Ta slovenski standard je istoveten z: ISO 76:1987/Amd 1:1999
ICS:
21.100.20 Kotalni ležaji Rolling bearings
SIST ISO 76:2001/AMD1:2001 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST ISO 76:2001/AMD1:2001

---------------------- Page: 2 ----------------------

SIST ISO 76:2001/AMD1:2001
INTERNATIONAL ISO
STANDARD 76
Second edition
1987-02-01
AMENDMENT 1
1999-11-15
Rolling bearings — Static load ratings
AMENDMENT 1: Annex A (informative) —
Discontinuities in the calculation of basic static
load ratings
Roulements — Charges statiques de base
AMENDEMENT 1: Annexe A (informative) — Discontinuités dans le calcul
des charges statiques de base
A
Reference number
ISO 76:1987/Amd.1:1999(E)

---------------------- Page: 3 ----------------------

SIST ISO 76:2001/AMD1:2001
ISO 76:1987/Amd.1:1999(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
Amendment 1 to ISO 76:1987 was prepared by Technical Committee ISO/TC 4, Rolling bearings, Subcommittee
SC 8, Load ratings and life. It constitutes a possibility of more accurately calculating and comparing static load
ratings for radial and thrust angular contact ball bearings.
Amendment 1 to ISO 76:1987 comprises annex A to ISO 76:1987 and is for information only.
©  ISO 1999
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet [e-mail]
Printed in Switzerland
ii

---------------------- Page: 4 ----------------------

SIST ISO 76:2001/AMD1:2001
  © ISO
ISO 76:1987/Amd.1:1999(E)
Rolling bearings — Static load ratings
AMENDMENT 1: Annex A (informative) — Discontinuities in the
calculation of basic static load ratings
A.1  Discontinuities in the calculation of basic static load ratings for radial and thrust
angular contact ball bearings
The factors used for calculation of basic static load ratings C and C according to ISO 76 are slightly different for
0r 0a
radial and thrust angular contact ball bearings.
Therefore there is a discontinuity in the calculated static axial load rating ( ) when a bearing with the contact
C
0a
angle a = 45° is first regarded as a radial bearing (C = C /Y ) and then as a thrust bearing.
0a 0r 0
This annex explains why the load rating factors are different, and shows how the load ratings can be re-calculated
in order to bring about correct comparisons under the same conditions.
A.2  Symbols
The same symbols are used as in ISO 76:1987. Additional symbols are:
C is the adjusted basic static axial load rating for a radial bearing (a < 45°), in newtons;
0ar
C is the adjusted basic static axial load rating for a thrust bearing (a . 45°), in newtons;
0aa
r is the cross-sectional raceway groove radius of inner ring, in millimetres;
i
r is the cross-sectional raceway groove radius of outer ring, in millimetres.
e
A.3  Different factors for calculating the static load
...