ISO INTERNATIONAL STANDARD 19690-1 First edition 2017-03 Disc springs Part 1: Calculation Ressorts a disques - Partie 1: Calcul Reference number ISO 19690-1:2017(E) International Organization for Standardization @ IS0 2017 =ZHEJIANG INST OF STANDARDIZATION C1 5956617 Not for Resale, 2017/5/16 00:32:4 itted without license from IHS IS0 19690-1:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, 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 copyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org PrganizationforStandardization ensee-ZHEJIANG INST OF STANDARDIZRoISQ $17 - All rights reserved Not for Resale, 2017/5/16 00:32:4 etworking permitted without license from IHS IS0 19690-1:2017(E) Contents Page Foreword ..iv 1 Scope 2 Normative references 3 Terms and definitions 4 Symbols and units 5 Dimensions and designation .3 5.1 General. .3 5.2 Disc spring groups .3 5.3 Dimensional series. .4 6 Design formulae for springs .4 6.1 General ..4 6.2 Test load. .4 6.3 Coefficients used in calculation .4 6.4 Springload .5 6.5 Design stresses. 6.6 Spring rate. .6 6.7 Energy capacity of springs .6 7 Load characteristics .6 7.1 Load characteristics for a single disc spring .6 7.1.1 Load/deflection curve .6 7.1.2 Design and actual load characteristics. .7 7.2 Load characteristics for stacks of disc springs ..8 7.2.1 General. 7.2.2 Stacking in parallel. ..8 7.2.3 Stacking in series 7.2.4 Stacking in parallel and series. .10 8 Design stresses ..11 9 Types of loading ..12 9.1 Static loading and moderate fatigue conditions ..12 9.2 Dynamic loading .12 Bibliography .13 iii see=ZHEJIANG INST OF STANDARDIZATION C15956617 d without license from IHS Not for Resale, 2017/5/16 00:32:44