BRITISH STANDARD AUTOMOBILE SERIES BS AU 214a 1 1987 ISO 8667 1986 Incorporating Amendment No 1 Specification for Gearbox flanges — Part 1 Specification for dimensions of cross tooth gearbox flanges,[.]
Licensed Copy: London South Bank University, London South Bank University, Wed Mar 22 03:00:25 GMT 2006, Uncontrolled Copy, (c) BSI BRITISH STANDARD AUTOMOBILE SERIES BS AU 214a-1:1987 ISO 8667:1986 Incorporating Amendment No Specification for Gearbox flanges — Part 1: Specification for dimensions of cross-tooth gearbox flanges, type T, for commercial vehicles and buses UDC 629.114.4/.5:621.825.24 Licensed Copy: London South Bank University, London South Bank University, Wed Mar 22 03:00:25 GMT 2006, Uncontrolled Copy, (c) BSI BS AU 214a-1:1987 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Automobile Standards Committee (AUE/-) to Technical Committee AUE/13, upon which the following bodies were represented: Department of Transport (Highways) Freight Transport Association Institute of Road Transport Engineers (Incorporated) London Regional Transport Ministry of Defence National Bus Company Road Haulage Association Ltd Society of Motor Manufacturers and Traders Limited This British Standard, having been prepared under the direction of the Automobile Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 January 1987 © BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference AUE/13 Draft for comment 84/78655 DC ISBN 580 15687 Amendments issued since publication Amd No Date of issue Comments 5778 January 1988 Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Wed Mar 22 03:00:25 GMT 2006, Uncontrolled Copy, (c) BSI BS AU 214a-1:1987 Contents Committees responsible National foreword Scope and field of application References Dimensions and tolerances Designation Figure Table Publications referred to © BSI 02-2000 Page Inside front cover ii 1 1 Inside back cover i Licensed Copy: London South Bank University, London South Bank University, Wed Mar 22 03:00:25 GMT 2006, Uncontrolled Copy, (c) BSI BS AU 214a-1:1987 National foreword This British Standard has been prepared under the direction of the Automobile Standards Committee and is identical with ISO 8667:1986 “Commercial vehicles and buses — Cross-tooth gearbox flanges, type T”, published by the International Organization for Standardization (ISO) Terminology and conventions The text of the International Standard has been approved as suitable for publication as a British Standard without deviation Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following The comma has been used as a decimal marker In British Standards it is current practice to use a full point on the baseline as the decimal marker Wherever the words “International Standard” and “ISO 8667” appear, referring to this standard, they should be read as “British Standard” and “BS AU 214a-1” respectively Cross-references International Standard Corresponding British Standard ISO 7646:1986 BS AU 214: Gearbox flanges Part 2:1987 Specification for dimensions for type A gearbox flanges for commercial vehicles and buses (Identical) Part 3:1987 Specification for dimensions for type S gearbox flanges for commercial vehicles and buses (Identical) ISO 7647:1986 The Technical Committee has reviewed the provisions of ISO 1101:1983 to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard A related British Standard to ISO 1101 is BS 308 “Engineering drawing practice” Part 3:1972 “Geometrical tolerancing” A British Standard does not purport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct application Compliance with a British Standard does not of itself confer immunity from legal obligations Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages and 2, an inside back cover and a back cover This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover ii © BSI 02-2000 Licensed Copy: London South Bank University, London South Bank University, Wed Mar 22 03:00:25 GMT 2006, Uncontrolled Copy, (c) BSI BS AU 214a-1:1987 Scope and field of application This International Standard specifies the nominal dimensions and tolerances which affect interchangeability between cross-tooth gearbox flanges, type T, and mating parts used on commercial vehicles and buses Dimensions and tolerances of the mating parts, other than those occurring at the interface of the two flanges, are left to the discretion of the manufacturer of that component References ISO 1101, Technical drawings — Geometrical tolerancing — Tolerancing of form, orientation, location and run-out — Generalities, definitions, symbols, indications on drawings ISO 7646, Commercial vehicles and buses — Gearbox flanges — Type A ISO 7647, Commercial vehicles and buses — Gearbox flanges — Type S Dimensions and tolerances Nominal dimensions and tolerances which affect the interchangeability of type T gearbox flanges shall be as shown in the Table and Figure Where the flange is formed by forging, an additional groove either side of the driving teeth is permissible In this case the additional grooves not form part of the drive Designation Gearbox flanges meeting the requirements of this International Standard shall be identified by a certain number of elements, to be given in the following order: a) reference to this International Standard; b) type T; c) size code © BSI 02-2000 Example: Designation of a type T gearbox flange of size code 1: Flange ISO 8667-T1 Table Size code d1 d2 ± 0,5 d3 ± 0,5 d4 – 0,2 l – 0,5 d5 + 0,2 d6 ± 0,2 150 130 95 111 12 13 15 165 140 105 121 12 13 15 180 150 105 128 14 15 17 200 165 125 143 16 15 17 NOTE Gearbox flanges of types A and S, as specified in ISO 7646 and ISO 7647 respectively, are designed for force-locking (friction) torque transmission, their capacity for transmission being determined by the size of the flange and the bolts As static or dynamic torque loads increase, however, a point is reached when these are inadequate, and there is a need for form-locking components Increasing problems are being encountered with the flange joint in the assembly of drive shafts for heavy lorries, as power tools cannot be used because of space limitations, and because the large bolts, M16 type, have to be tightened steadily to a torque loading of about 300 N·m for example With special vehicles it may also be necessary to replace the engine, transmission units or axles in the shortest possible time, but this can be impracticable with a conventional flange joint which has, for example, ten M16 bolts This form-locking flange joint has been developed to avoid the need to increase the size of the flange or bolts while achieving the required performance or to simplify assembly Initially, a flange joint with spiral bevel-type teeth was developed but this is expensive to manufacture The flange joint specified in this International Standard overcomes the problems described above It requires only four bolts which are smaller than comparable flanges of conventional construction, and the alignment of the drive shaft is not dependent on them The drive shaft flange and the transmission flange centre themselves through the groups of teeth which intersect at 70° which improves alignment, and play, which occurs in conventional joints, is eliminated As the drive is transmitted through the teeth, the axial force which arises under torque loading, which must be carried by the bolts, is relatively low A further feature is that jamming between flanges during dismantling is prevented The teeth can be produced on a universal milling machine with special cutters for short production runs, while for mass production the use of a surface broaching machine is envisaged The simple tooth form can be measured easily, thus ensuring interchangeability between components made by different manufacturers Licensed Copy: London South Bank University, London South Bank University, Wed Mar 22 03:00:25 GMT 2006, Uncontrolled Copy, (c) BSI BS AU 214a-1:1987 Figure © BSI 02-2000 Licensed Copy: London South Bank University, London South Bank University, Wed Mar 22 03:00:25 GMT 2006, Uncontrolled Copy, (c) BSI BS AU 214a-1:1987 Publications referred to See national foreword © BSI 02-2000 Licensed Copy: London South Bank University, London South Bank University, Wed Mar 22 03:00:25 GMT 2006, Uncontrolled Copy, (c) BSI BS AU 214a-1:1987 ISO 8667:1986 BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or 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