ISO INTERNATIONAL STANDARD 9457-1 First edition 1991-04-15 Road vehicles --- Metric starter motor pinions. Part 1: Currently used pinions Vehicules routiers -Pignons de demarreurs a module metrique Partie1:Pignonsd'usagecourant Reference number ISO 9457-1:1991(E) ISO 9457-1:1991(E) Foreword 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 subject for which atechnical committee has been established has the righttobe represented on that committee.International organizations, govern- mental and non-governmental,in liaisonwith isO,alsotakepart inthe work.Iso collaborates closely with the International Electrotechnical Commission(iEC)onallmattersofelectrotechnicalstandardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.Publication as an Inter- national Standard requiresapproval byatleast75%ofthemember bodies casting a vote. International StandardisO9457-1waspreparedbyTechnicalCommittee ISO/TC22,Roadvehicles. iso 9457 consists of thefollowingparts,under the general title Road vehicles-Metric startermotorpinions: Part 1: Currently used pinions NOTE -Afuturepartwill coverpinionswitha20°pressureangle C ISO 1991 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 OrganizationforStandardization CasePostale56.CH-1211Geneve20·Switzerland Printed in Switzerland ii ISO 9457-1:1991(E) INTERNATIONALSTANDARD Road vehicles -- Metric starter motor pinions - Part 1: Currently used pinions 2 Dlmensions Scope Detailed tooth limit dimensions and the basetangent as the inspection value,W2,are given in length table 1 for currently used starter motor pinions. This part of Iso 9457 specifies the metric modules, NOTE1 Thesymbols,which areinaccordancewith pressure angles, number of teeth and other tooth iso701:1976,International gearnotation-Symbo/s for characteristics which are necessary to ensure geometrical data, are illustrated in figure1. interchangeability of currently used starter motor pinions (those with a pressure angle of14°30') used Other dimensions and specifications for starter motors mounted on reciprocating interna! 3 combustion engines for road vehicles. Dimensions and requirements not given in this part of iso 9457 are left to the manufacturer's choice.