ISO INTERNATIONAL STANDARD 18137 First edition 2015-08-01 Leaf springs Technical specifications Ressorts a lames - Spécifications techniques Reference number ISO 18137:2015(E) ISO @IS02015 IS0 18137:2015(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2015, Published in Switzerland All rights reserved. Unless otherwise specified, 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 Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax+4122 749 09 47 copyright@iso.org www.iso.org @ IS0 2015 - All rights reserved Copvriaht Inte IS0 18137:2015(E) Contents Page Foreword .iv 1 Scope ..1 2 Normative references ..1 3 Terms and definitions ..1 4 Symbols .1 5 Spring types .2 6 Technical requirements. ..7 6.1 Materials. .7 6.2 Tolerances of spring dimensions and shapes .7 6.2.1 Span. .7 6.2.2 Assembled spring width. .7 6.2.3 Spring end width 8 6.2.4 Eye inner diameter and bush inner diameter .8 6.2.5 Flank bending ..8 6.2.6 Perpendicularity and parallelism of the spring eye .9 6.3 Requirements for characteristic 10 6.3.1 Spring rate .10 6.3.2 Design camber .10 6.3.3 Fatigue .10 6.4 Requirements for manufacturing 10 6.4.1 Hardness .10 6.4.2 Decarburization. .10 6.4.3 Shot peening. .10 6.4.4 Presetting 11 6.4.5 Lubricant and surface protection 11 6.4.6 Surface conditions. ..11 7 Designation .11 Annex A (informative) Test methods of leaf springs ..12 son to? Standardizann rights reserved iii