Bsi bs au 214a 1 1987 (2000) iso 8667 1986

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,[.]

ISO 8667:1986

Incorporating Amendment No 1

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

This British Standard, having

been prepared under the

direction of the Automobile

Standards Committee, was

published under the authority

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

© BSI 02-2000 i

Contents

Page

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

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.

Cross-references

International Standard Corresponding British Standard

Part 2:1987 Specification for dimensions for type A gearbox flanges for commercial vehicles and buses

(Identical) ISO 7647:1986 Part 3:1987 Specification for dimensions for type S

gearbox flanges for commercial vehicles and buses

(Identical)

© BSI 02-2000 1

1 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

2 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

3 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 do not form part

of the drive

4 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

Example:

Designation of a type T gearbox flange of size code 1:

Flange ISO 8667-T1

Table

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.

Size code d1

± 0,5

d2 d3

± 0,5

d4

0 – 0,2

l

0 – 0,5

d5

+ 0,2 0

d6

± 0,2

1 150 130 95 111 12 13 15

2 165 140 105 121 12 13 15

3 180 150 105 128 14 15 17

4 200 165 125 143 16 15 17

Figure

© BSI 02-2000

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