ISO INTERNATIONAL STANDARD 1604 Second edition 1989-11-15 Belt drives - Endless wide V-belts for industrial speed-changers and groove profiles for corresponding pulleys Transmissions par courroies - Courroies trapezoidales larges sans fin pour variateurs de vitesse industriels et profils de gorge des poulies correspondantes Reference number ISO 1604 : 1989 (E) Noreproduction ornetworking permitted without license from IHS Not for Resale ISO 1604 : 1989 (E) Foreword Iso (the International Organization for Standardization) is a woridwide 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, 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 member bodies for approval before their acceptance as International Standards by the Iso Council. They are approved in accordance with Iso procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 1604 was prepared by Technical Committee ISO/TC 41, Pulleys and belts (including veebelts). This second edition cancels and replaces the first edition (IS0 1604: 1976), of which it constitutes a technical revision. AnnexAofthis International Standard isforinformationonly. ? ISO 1989 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 CopyrightInternational Organizatin for Standardization etworking permitted without license from IHS Not for Resale ISO 1604 : 1989 (E) INTERNATIONAL STANDARD Belt drives -- Endless wide V-belts for industrial speed changers and groove profiles for corresponding pulleys 1 Scope 3 Definitions and symbols This International Standard specifies the principal dimensions For the purposes of this international Standard, the terms and of endless wide V-belts for industrial speed-changers, and the symbols relatingto drives using V-belts (i.e.belts and grooved groove profiles of corresponding fixed or variable diameter pulleys) defined in ISo 1081 apply. pulleys. It does not apply to speed-changer belts used either as parts of farm-machines (in particularharvesters),which are stan- Belt designation dardized in IsO 3410,or for the propulsion of self-propelled vehicles (motor-cycles, scooters, cars). The belt designation consists of the letter W and the nominal pitch width of the belt. 2 Normative references The cross-sections are designated as follows: The following standards contain provisions which,through reference in this text, constitute provisions of this International W16-W20-W25-W31.5-W40-W50-W63 Standard. At the time of publication, the editions indicated W80-W100 were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged The values of the pitch widths, w, (expressed in millimetres), toinvestigate thepossibility of applyingthe most recent are nine consecutive terms from the R10 series of preferred editions of the standards listed below. Members of IEC and ISO numbers. Should this series of values be considered insuffi- maintain registers of currently valid international Standards. cient, it may be completed Is0 1081 : 1980, Drives using V-belts and grooved pulleys - outside the limits, with other terms from the R10 series Terminology. of preferred numbers; ISO9608:1988,V-be/ts Uniformity of belts Centre inside the limits, with terms from the R20 s