(iso International Standard 7646 INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONMEXAYHAPOAHAA OPFAHW3AUMA HO CTAHAAPTW3ALWWORGANISATION INTERNATIONALE DE NORMALISATION Commercial vehicles and buses - Gearbox flanges Type A Vehicules utilitaires et autobus --Brides de boites de vitesses -- Type A First edition - 1986-08-15 UDC 629.114.4/.5:62-58 Ref. No. ISO 7646-1986 (E) ISO 7646-1986 (E) Descriptors : road vehicles, commercial road vehicles, buses (vehicles), gearboxes, flanges, dimensions, designation. Price based on3 pages 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 a technical committee has been established has mental and non-governmental, in liaison withIso,also takepart in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approvai before their acceptance as International Standards by least 75 % approval by the member bodies voting. International Standard ISO 7646 was prepared by Technical Committee ISO/TC 22, Roadvehicles. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. InternationalOrganizationforStandardization,1986 Printed in Switzerland ISO 7646-1986 (E) INTERNATIONAL STANDARD Commercial vehicles and buses - Gearbox flanges Type A 1 Scopeandfield of application 3 Dimensions and tolerances This International Standard specifies the nominal dimensions Nominal dimensions, tolerances and bolt hole fixing positions and tolerances which affect the interchangeability between which affect the interchangeability of type A flanges for gear- gearbox flanges and mating parts used on commercial vehicles boxes are shown in figures 1 to 5, and given in the table. and buses. The flanges covered by this International Standard are designated type A. They are not interchangeable with Designation type S flanges dealt with in ISo 7647. Gearbox flanges meeting the requirements of this International Dimensions not specified are left to the discretion of the com- Standard shall be identified bythefollowingdetails intheorder ponent manufacturer. specified: a) reference to this International Standard; 2 References b) the diameter of the flange, ds; c) the number of fixing bolts; ISo286,/sosystemof limitsandfits.1) d)the size of the fixing bolts. IS01101,Technicaldrawings Geometricaltolerancing Example: Tolerancing of form, orientation, location and run-out Generalities, definitions, symbols, indications on drawings. Designation of a gearbox flange type A with d = 150 mm and eight 12 mm fixing bolts: Iso7647,Road vehicles---Gearbox flanges for commercial vehicles and buses - Type S. Flange IS0 7646-150 × 8 × 12 1) At present at the stage of draft. (Revision of ISO/R 286-1962.)