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, type T, for
commercial vehicles and buses
UDC 629.114.4/.5:621.825.24
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BS AU 214a-1:1987
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 0 580 15687 7
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
Amendments issued since publication
Amd. No. Date of issue Comments
5778 January 1988 Indicated by a sideline in the margin
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BS AU 214a-1:1987
© BSI 02-2000 i
Contents
Page
Committees responsible Inside front cover
National foreword ii
1 Scope and field of application 1
2 References 1
3 Dimensions and tolerances 1
4 Designation 1
Figure 2
Table 1
Publications referred to Inside back cover
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BS AU 214a-1:1987
ii © BSI 02-2000
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
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)
ISO 7647:1986 Part 3:1987 Specification for dimensions for type S
gearbox flanges for commercial vehicles and buses
(Identical)
Summary of pages
This document comprises a front cover, an inside front cover, pages i and ii,
pages 1 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.
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BS AU 214a-1:1987
© 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
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BS AU 214a-1:1987
2 © BSI 02-2000
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BS AU 214a-1:1987
© BSI 02-2000
Publications referred to
See national foreword.
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BS AU
214a-1:1987
ISO 8667:1986
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