ISO 2790:2020
(Main)Belt drives — V-belts for the automotive industry and corresponding pulleys — Dimensions
Belt drives — V-belts for the automotive industry and corresponding pulleys — Dimensions
This document specifies the requirements for belts and pulleys for V-belt drives used for driving auxiliaries of internal combustion engines for the automotive industry.
Transmissions par courroies — Courroies trapézoïdales pour la construction automobile et poulies correspondantes — Dimensions
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INTERNATIONAL ISO
STANDARD 2790
Fifth edition
2020-06
Belt drives — V-belts for the
automotive industry and
corresponding pulleys — Dimensions
Transmissions par courroies — Courroies trapézoïdales pour la
construction automobile et poulies correspondantes — Dimensions
Reference number
ISO 2790:2020(E)
©
ISO 2020
---------------------- Page: 1 ----------------------
ISO 2790:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 2790:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Belts . 1
4.1 General . 1
4.2 Cross-section . 2
4.3 Measurement of the effective length of a belt and its ride-out . 3
4.4 Centre distance variations . 4
5 Service pulleys . 5
5.1 General . 5
5.2 Dimensions . 5
5.3 Checking of effective diameter . 7
5.4 Designation . 8
Bibliography . 9
© ISO 2020 – All rights reserved iii
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ISO 2790:2020(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.
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 documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
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 1, Friction.
This fifth edition cancels and replaces the fourth edition (ISO 2790:2004), which has been technically
revised. The main changes compared to the previous edition are as follows:
— the cogged type has been added throughout the document;
— the symmetry of the groove has been changed from (90 ± 2)° to (90 ± 0,5)° in Table 4, as in ISO 9981;
— the designation of belt has been added.
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.
iv © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 2790:2020(E)
Belt drives — V-belts for the automotive industry and
corresponding pulleys — Dimensions
1 Scope
This document specifies the requirements for belts and pulleys for V-belt drives used for driving
auxiliaries of internal combustion engines for the automotive industry.
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 1081, Belt drives — V-belts and V-ribbed belts, and corresponding grooved pulleys — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1081 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Belts
4.1 General
A belt is defined by its cross-section, type and by its effective length in millimetres measured under
specified conditions. Cogged belt is represented by X.
Belt types are given in Figure 1.
© ISO 2020 – All rights reserved 1
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ISO 2790:2020(E)
a) Raw-edge plain be
...
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 2790
ISO/TC 41/SC 1
Belt drives — V-belts for the
Secretariat: AFNOR
automotive industry and
Voting begins on:
20200326 corresponding pulleys — Dimensions
Voting terminates on:
Transmissions par courroies — Courroies trapézoïdales pour la
20200521
construction automobile et poulies correspondantes — Dimensions
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
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
ISO/FDIS 2790:2020(E)
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. ISO 2020
---------------------- Page: 1 ----------------------
ISO/FDIS 2790:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
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
CH1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 2790:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Belts . 1
4.1 General . 1
4.2 Crosssection . 2
4.3 Measurement of the effective length of a belt and its rideout . 3
4.4 Centre distance variations . 4
5 Service pulleys . 5
5.1 General . 5
5.2 Dimensions . 5
5.3 Checking of effective diameter . 7
5.4 Designation . 8
Bibliography . 9
© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/FDIS 2790:2020(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 nongovernmental, 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 documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
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 1, Friction.
This fifth edition cancels and replaces the fourth edition (ISO 2790:2004), which has been technically
revised. The main changes compared to the previous edition are as follows:
— the cogged type has been added throughout the document;
— the symmetry of the groove has been changed from (90 ± 2)° to (90 ± 0,5)° in Table 4, as in ISO 9981;
— the designation of belt has been added.
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.
iv © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 2790:2020(E)
Belt drives — V-belts for the automotive industry and
corresponding pulleys — Dimensions
1 Scope
This document specifies the requirements for belts and pulleys for V-belt drives used for driving
auxiliaries of internal combustion engines for the automotive industry.
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 1081, Belt drives — V-belts and V-ribbed belts, and corresponding grooved pulleys — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1081 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Belts
4.1 General
A belt is defined by its cross-section,
...
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