ISO INTERNATIONAL STANDARD 3410 Second edition 1989-08-01 Agricultural machinery -- Endless variable-speed V-belts and groove sections of corresponding pulleys Machines agricoles - Courroies trapézoidales sans fin pour variateurs de vitesse et profilsdegorgedespouliescorrespondantes Reference number ISO3410:1989 (E) Povdedbysunderlicensewith o for Standardizatior No reproduction or networking permited without license from IHS Not for Resale ISO3410:1989(E) Foreword ISo(the International Organization for Standardization)is a worldwidefederation of national standards bodies (IsO member bodies). The work of preparing International Standards is normaly 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, govern- mental 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. Draft International Standards adopted by the technical committees are circulated to the ISO Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 3410 was prepared by Technical Committee ISO/TC 41, Pulleys and belts (including veebelts). This second edition cancels and replaces the first edition (IS0 3410 : 1976), of which it constitutes a technical revision. Annex A of this International Standard is for information only ISO 1989 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 . CH-1211 Geneve 20 . Switzerland Printed in Switzerland for Standardizatior No reproduction or networking permited withoutlicense from IHS Provided by IHS un Not for Resale ISO3410:1989(E) INTERNATIONALSTANDARD Agricultural machinery - Endless variable-speed V-belts and groove sections of corresponding pulleys 1 Scope 4.1.2 Cross-sections (see figure 1) This International Standard specifies the main dimensions of The cross-section is characterized by a "relative height" (re- lation of height T of sides to pitch width wp) which, on machinery (and, in particular, harvester-thresher machines), average, is in the region of o,5; the pitch line is shown as being together with the groove section of the corresponding fixed- or at approximately one-third of the height of the profile below the variable-diameter pulleys. large base of the trapezium. The cross-sectional dimensions are given in table 2 4.1.3Lengths 2 Normative references The range of datum lengths is that of the R 40 series of prefer- The following standards contain provisions which, through red numbers (see IS0 3) from 630 mm to 5000 mm (see reference in this text, constitute provisions of this International table 3). If intermediate values are required, they shall be taken Standard. At the time of publication, the editions indicated from the R 80 series of preferred numbers (see ISO 3). were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encour. 4.1.4 Tolerance on length aged to investigate the possibility of applying the most recent editions of the standards listed below. Members of IEC and ISO The length of the belts is affected by the maximum admissible maintain registers of currently valid international Standards. variations of + p/2. 2, where p is calculated, with a certain Series of preferred amount of approximation, using the formula Iso 3 : 1973, Preferred numbers - numbers. p=0,83L+0006L iso 1081 : 1980, Drives using V-belts and pulleys -- Termi- L being the preferred number from the R 10 series equal to or nology. immedi