ISO/DIS 18137-1

DRAFT INTERNATIONAL STANDARD
ISO/DIS 18137-1
ISO/TC 227 Secretariat: JISC
Voting begins on: Voting terminates on:
2014-03-27 2014-06-27
Leaf springs —
Part 1:
Technical requirements and test methods
Ressorts à lames —
Partie 1: Exigences techniques et méthodes d’essai
ICS: 21.160
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
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STANDARDS MAY ON OCCASION HAVE TO
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Reference number
NATIONAL REGULATIONS.
ISO/DIS 18137-1:2014(E)
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 SUPPORTING DOCUMENTATION. ISO 2014
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ISO/DIS 18137-1:2014(E)
Copyright notice

This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as

permitted under the applicable laws of the user’s country, neither this ISO draft nor any extract

from it may be reproduced, stored in a retrieval system or transmitted in any form or by any means,

electronic, photocopying, recording or otherwise, without prior written permission being secured.

Requests for permission to reproduce should be addressed to either ISO at the address below or ISO’s

Foreword ......................................................................................................................................................iv

1 Scope ................................................................................................................................................1

2 Normative references .......................................................................................................................1

3 Terms and symbols ..........................................................................................................................1

3.1 Terms ................................................................................................................................................1

3.2 Symbols and units ............................................................................................................................1

4 Spring types .....................................................................................................................................3

5 Technical requirements ...................................................................................................................6

5.1 Materials ...........................................................................................................................................6

5.2 Tolerances of spring dimensions and shapes ................................................................................6

5.2.1 Span ..................................................................................................................................................6

5.2.2 Assembled spring width ..................................................................................................................6

5.2.3 Spring end width ..............................................................................................................................7

5.2.4 Eye inner diameter and bush inner diameter ..................................................................................7

5.2.5 Flank bending ...................................................................................................................................8

5.2.6 Perpendicularity and parallelism of the spring eye ........................................................................8

5.3 Requirements for characteristic ......................................................................................................9

5.3.1 Spring rate ........................................................................................................................................9

5.3.2 Design camber..................................................................................................................................9

5.3.3 Fatigue ..............................................................................................................................................9

5.4 Requirements for manufacturing .....................................................................................................9

5.4.1 Hardness ...........................................................................................................................................9

5.4.2 Decarburization ................................................................................................................................9

5.4.3 Shot peening ....................................................................................................................................9

5.4.4 Presetting .......................................................................................................................................10

5.4.5 Lubricant and surface protection ..................................................................................................10

5.4.6 Surface conditions .........................................................................................................................10

6 Designation .....................................................................................................................................10

Annex A (normative) Test methods of the leaf springs ........................................................................... 11

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 s ubject for which a technical committee has been

established has the right to be represented on that committee. International organizations, governmental and

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International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. 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.

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.

This International standard specifies the technical requirements and test methods for leaf springs.

This International Standard is applicable to leaf springs for road vehicle (hereinafter simply “springs”). The leaf

The following referenced documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated references,

the latest edition of the referenced document (including any amendments) applies.

ISO 683-14, Heat-treatable steels, alloy steels and free-cutting steels — Part 14: Hot-rolled steels for

For the purposes of this document, the terms given in ISO 26909 and Table 1 apply.

For the purposes of this document, the symbols and units given in ISO 16249 and Table 1 apply.

Unless otherwise agreed by the purchaser and the supplier, the springs should be made from the hot rolled

The tolerances of the straight span and the fixed half straight span should be in accordance with Table 2.