ISO 9981:2020
(Main)Belt drives — Pulleys and V-ribbed belts for the automotive industry — PK profile: Dimensions
Belt drives — Pulleys and V-ribbed belts for the automotive industry — PK profile: Dimensions
This document specifies the principal dimensional characteristics of V-ribbed pulley groove profiles, together with the corresponding endless V-ribbed belts of PK profile which are used predominantly for automotive accessory drive applications. This document does not apply to the complete array of V-ribbed belts and pulleys of PH, PJ, PK, PL and PM profile for industrial and other non-automotive applications which are covered by ISO 9982. PK belt profile dimensions and tolerances are the same in both International Standards. 6.2 and 6.3 of this document do not apply to elastic belts.
Transmissions par courroies — Poulies et courroies striées pour la construction automobile — Profil PK: Dimensions
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INTERNATIONAL ISO
STANDARD 9981
Third edition
2020-06
Belt drives — Pulleys and V-ribbed
belts for the automotive industry —
PK profile: Dimensions
Transmissions par courroies — Poulies et courroies striées pour la
construction automobile — Profil PK: Dimensions
Reference number
ISO 9981:2020(E)
©
ISO 2020
---------------------- Page: 1 ----------------------
ISO 9981:2020(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 9981:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 1
5 Pulleys . 2
5.1 Groove dimensions and tolerances . 2
5.2 Minimum effective diameter . 4
5.3 Tolerances on finished pulley . 4
5.3.1 Checking conditions . 4
5.3.2 Groove-to-groove diameter tolerances . 5
5.3.3 Radial and axial circular run-out . 5
5.3.4 Diameter over balls. 5
5.3.5 Groove finish. 5
5.4 Pitch diameter, d . 5
p
5.5 Designation of pulleys. 5
6 Belts . 6
6.1 Belt dimensions . 6
6.2 Measurement of the effective belt length . 8
6.2.1 Elastic belt . 8
6.2.2 Measuring fixture . 8
6.2.3 Measuring force . 8
6.2.4 Procedure . 8
6.3 Designation of belts . 9
Bibliography .10
© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 9981:2020(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 third edition cancels and replaces the second edition (ISO 9981:1998), which has been technically
revised. The main changes compared to the previous edition are as follows:
— the normative references list has been updated;
— clarification has been made where the standard is not for elastic belts;
— 5.3.5 has been revised to reference ISO 254 for pulley roughness;
— the current roughness values have been removed;
— the maximum pulley groove radius (Table 2) has been specified.
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 ----------------------
ISO 9981:2020(E)
Introduction
A V-ribbed belt drive is composed of an endless belt with a longitudinally ribbed traction surface which
engages and grips, by friction, pulley grooves of similar shape. The belt ribbed surface fits the pulley
grooves to make nearly total contact.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 9981:2020(E)
Belt drives — Pulleys and V-ribbed belts for the automotive
industry — PK profile: Dimensions
1 Scope
This document specifies the principal dimensional characteristics of V-ribbed pulley groove profiles,
together with the corresponding endless V-ribbed belts of PK profile which are used predominantly for
automotive accessory drive applications.
This document does not apply to the complete array of V-ribbed belts and pulleys of PH, PJ, PK, PL and
PM profile for industrial and other non-autom
...
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 9981
ISO/TC 41/SC 1
Belt drives — Pulleys and V-ribbed
Secretariat: AFNOR
belts for the automotive industry —
Voting begins on:
20200324 PK profile: Dimensions
Voting terminates on:
Transmissions par courroies — Poulies et courroies striées pour la
20200519
construction automobile — Profil PK: 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 9981:2020(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 9981:2020(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 9981:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviations . 1
5 Pulleys . 2
5.1 Groove dimensions and tolerances . 2
5.2 Minimum effective diameter . 4
5.3 Tolerances on finished pulley . 4
5.3.1 Checking conditions . 4
5.3.2 Groovetogroove diameter tolerances . 5
5.3.3 Radial and axial circular run-out . 5
5.3.4 Diameter over balls. 5
5.3.5 Groove finish. 5
5.4 Pitch diameter, d . 5
p
5.5 Designation of pulleys. 5
6 Belts . 6
6.1 Belt dimensions . 6
6.2 Measurement of the effective belt length . 8
6.2.1 Elastic belt . 8
6.2.2 Measuring fixture . 8
6.2.3 Measuring force . 8
6.2.4 Procedure . 8
6.3 Designation of belts . 9
Bibliography .10
© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/FDIS 9981:2020(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 third edition cancels and replaces the second edition (ISO 9981:1998), which has been technically
revised. The main changes compared to the previous edition are as follows:
— the normative references list has been updated;
— clarification has been made where the standard is not for elastic belts;
— 5.3.5 has been revised to reference ISO 254 for pulley roughness;
— the current roughness values have been removed;
— the maximum pulley groove radius (Table 2) has been specified.
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 ----------------------
ISO/FDIS 9981:2020(E)
Introduction
A V-ribbed belt drive is composed of an endless belt with a longitudinally ribbed traction surface which
engages and grips, by friction, pulley grooves of similar shape. The belt ribbed surface fits the pulley
grooves to make nearly total contact.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 9981:2020(E)
Belt drives — Pulleys and V-ribbed belts for the automotive
industry — PK profile: Dimensions
1 Scope
This document specifies the principal dimensional characteristics of V-ribbed pulley groove profiles,
...
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