ISO/FDIS 12046
(Main)Synchronous belt drives — Automotive belts — Determination of physical properties
Synchronous belt drives — Automotive belts — Determination of physical properties
This International Standard specifies test methods for determining the physical properties of synchronous belts used in driving engine parts, such as camshafts, fuel injection pumps, balancing shafts. These test methods are intended to provide a means of characterizing synchronous belt properties for belts which are evaluated and qualified by dynamic laboratory and field testing. NOTE The dimensional characteristics of these belts are the subject of ISO 9010.
Transmissions synchrones par courroies — Courroies pour la construction automobile — Détermination des caractéristiques physiques
La présente Norme internationale spécifie des méthodes d'essai pour déterminer les caractéristiques physiques des courroies synchrones utilisées pour l'entraînement des pièces de moteurs, telles que les arbres à cames, les pompes à injection et les arbres d'équilibrage de vilebrequin. Ces méthodes d'essai sont destinées à fournir un moyen permettant de déterminer les caractéristiques des courroies synchrones qui sont évaluées et qualifiées par des essais dynamiques en laboratoire et par des essais en conditions réelles.
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FINAL DRAFT
International
Standard
ISO/TC 41/SC 4
Synchronous belt drives —
Secretariat: ANSI
Automotive belts — Determination
Voting begins on:
of physical properties
2024-10-15
Transmissions synchrones par courroies — Courroies pour la
Voting terminates on:
construction automobile — Détermination des caractéristiques
2024-12-10
physiques
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 41/SC 4
Synchronous belt drives —
Secretariat: ANSI
Automotive belts — Determination
Voting begins on:
of physical properties
Transmissions synchrones par courroies — Courroies pour la
Voting terminates on:
construction automobile — Détermination des caractéristiques
physiques
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2024
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Test methods . 1
6 General conditions for testing . 2
6.1 Standard environmental conditions .2
6.2 Standard conditions of test specimens .2
6.3 Rounding off the test results .2
6.4 Test report .2
7 Static property tests . 3
7.1 Test for hardness of rubber core .3
7.1.1 Test specimens .3
7.1.2 Procedure .3
7.1.3 Expression of results .3
7.2 Tensile strength test .3
7.2.1 Test specimens .3
7.2.2 Procedure .3
7.2.3 Expression of results .4
7.3 Fabric adhesion test .4
7.3.1 Test specimens .4
7.3.2 Procedure .4
7.3.3 Expression of results .4
7.4 Tension-cord adhesion test.5
7.4.1 Test specimens .5
7.4.2 Procedure .6
7.4.3 Expression of results .6
7.5 Tooth-shear test . .6
7.5.1 Test specimens .6
7.5.2 Apparatus .6
7.5.3 Tooth-shearing chip .7
7.5.4 Procedure .9
7.5.5 Expression of results .9
7.6 Test for resistance to high temperature .9
7.6.1 Test specimens .9
7.6.2 Procedure .10
7.7 Test for resistance to low temperature .10
7.7.1 Test specimens .10
7.7.2 Procedure .10
7.8 Test for resistance to oil .10
7.8.1 Test specimens .10
7.8.2 Procedure .10
7.9 Test for resistance to ozone .10
7.9.1 Test specimens .10
7.9.2 Procedure .10
7.10 Test for resistance to water .10
7.10.1 Test specimens .10
7.10.2 Procedure .11
iii
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.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee
...
ISO/TC 41/SC 4
ISO/DIS 12046:2024(en)
2024-06-07
Secretariat: ANSI
Third edition
Date: 2024-09-30
Synchronous belt drives — Automotive belts — Determination of
physical properties
Transmissions synchrones par courroies — Courroies pour la construction automobile — Détermination
des caractéristiques physiques
FDIS stage
ISO/DISFDIS 12046:2024(en)
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
E-mail: copyright@iso.org
Website: www.iso.org
Published in Switzerland
iii
Contents
Foreword . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Test methods . 1
6 General conditions for testing . 2
6.1 Standard environmental conditions . 2
6.2 Standard conditions of test specimens . 2
6.3 Rounding off the test results . 2
6.4 Test report . 2
7 Static property tests . 3
7.1 Test for hardness of rubber core. 3
7.2 Tensile strength test . 3
7.3 Fabric adhesion test . 4
7.4 Tension-cord adhesion test . 7
7.5 Tooth-shear test . 8
7.6 Test for resistance to high temperature . 13
7.7 Test for resistance to low temperature . 13
7.8 Test for resistance to oil . 13
7.9 Test for resistance to ozone . 13
7.10 Test for resistance to water . 14
iv
ISO/DISFDIS 12046:2024(en)
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.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 41, Pulleys and belts (including veebelts),
Subcommittee SC 4, Synchronous belt drives.
This secondthird edition cancels and replaces the second edition (ISO 12046:2012), which has been
technically revised.
The main changes are as follows:
— Clause 2— Clause 2 - Normative References was has been updated.;
— Clause 7.9.2 – Volumetricvolumetric units werehave been clarified ( 7.9.2.).
- Bibliography was updated
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
v
DRAFT International Standard ISO/DIS 12046:2024(en)
Synchronous belt drives — Automotive belts — Determination of
physical properties
1 Scope
This document specifies test methods for determining the physical properties of synchronous belts used in
driving engine parts, such as camshafts, fuel injection pumps, balancing shafts. These test methods are
intended to provide a means of characterizing synchronous belt properties for belts which are evaluated and
qualified by dynamic laboratory and field testing.
NOTE The dimensional characteristics of these belts are covered in ISO 9010.
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 48-2, Rubber, vulcanized or thermoplastic — Determination of hardness (hardness— Part 2: Hardness
between 10 IRHD and 100 IRHD)
ISO 1817, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids
3 Terms and definitions
For the purposes of this document, the following terms and definitions given in ISO 5288 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— — ISO Online browsing platform: available at https://www.iso.org/obp
— — IEC Electropedia: available at https://www.electropedia.org/
4 Principle
The objective of the test methods covered in this document is the evaluation of the physical properties of
automotive synchronous belts through standardized testing. These test methods are independent of tooth
profiles.
5 Test methods
The tests covered in this document are listed in Table 1Table 1.
Table 1 — Tests
Test Subclause
Hardness of rubber core 7.1
Tensile strength 7.2
Test Subclause
Fabric adhesion 7.3
Tension-cord adhesion 7.4
Tooth shear 7.5
Resistance to high temperature 7.6
Resistance to low temperature 7.7
Resistance to oil 7.8
Resistance to ozone 7.9
Resistance to water 7.10
6 General conditions for testing
6.1 Standard environmental conditions
Standard conditions in the laboratory shall be maintained at a temperature of (25 ± 5) °C, a relative humidity
of (65 ± 20) % and an atmospheric pressure of 86 kPa to 106 kPa. The test conditions should be recorded.
6.2 Standard conditions of test specimens
The test specimens shall be tested at least 16 h after vulcanization and shall be kept for at least 1 h prior to
test in a room maintained under standard conditions.
6.3 Rounding off the test results
The results of each test shall be rounded off. Results shall be recorded according to the number of figures
specified in Table 2.
Table 2 — Rounding off of results
Test Unit Measured test value Test results to be obtained
Hardness of rubber core Shore A or IRHD Integer Integer
Tensile strength N Nearest 10 Nearest 100
Fabric adhesion N Integer Integer
Tension-cord adhesion N Nearest 10 Nearest 10
Tooth shear N Nearest 10 Nearest 10
EXAMPLES Nearest tens Nearest hundreds
3 474 → 3 470 3 440 → 3 400
3 475 → 3 480 3 450 → 3 500
...
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