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1、BRITISH STANDARD AUTOMOBILE SERIES BS AU 138a:1980 Specification for Dimensions of “contact” type couplings for air pressure braking systems on trailers and semi-trailers and their towing vehicles, and the arrangement of these couplings on articulated and drawbar combinations UDC 629.11.013.5:62 592
2、.52 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:49:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 138a:1980 This British Standard, having been prepared under the direction of the Automobile Standards Committee, was published under the authority of th
3、e Executive Board and comes into effect on 28 November 1980 BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference AUE/- Draft for comment 79/71031 DC ISBN 0 580 11566 6 Foreword This British Standard has been prepared under the direction of the Automobile
4、Standards Committee and supersedes BS AU 5:1963, except in regard to its application to vacuum brake systems, and BS AU 138:1967. BS AU 138:1967 is withdrawn on publication of this edition. BS AU 5 is not withdrawn. This edition of this standard makes no fundamental changes to these earlier standard
5、s but takes account of changes in normal practice since they were issued and clarifies certain details, particularly with regard to the operation of the self-sealing valves. The form of coupling and layout of couplings specified in this standard constitute a system for use on any vehicle having a tw
6、o- or three-line air pressure brake system. 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 obligation
7、s. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 10 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. Ame
8、ndments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:49:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 138a:1980 BSI 02-2000i Contents Page ForewordInside front cover 1Scope1 2References1 3General
9、 requirements1 4Articulated vehicles2 5Drawbar combinations3 Figure 1 C type male coupling with self-sealing valve4 Figure 2 C type female coupling with operating adaptor5 Figure 3 C type male coupling6 Figure 4 C type female coupling with self-sealing valve6 Figure 5 CA type female coupling with se
10、lf-sealing valve7 Figure 6 CA type male coupling8 Figure 7 Articulated vehicle braking connections9 Figure 8 Drawbar combination braking connections10 Table 1 Couplings2 Table 2 Summary of dimensions for articulated vehicles2 Licensed Copy: London South Bank University, London South Bank University,
11、 Sat Dec 09 01:49:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:49:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 138a:1980 BSI 02-20001 1 Scope This British Standard specifies the dimensions neces
12、sary to ensure the correct mating of “contact” couplings for connecting the air pressure brake systems of towing vehicles to trailers or semi-trailers, and the layout of these connections. Two types of “contact” coupling are specified: the C type, and the CA type; these two types of coupling are int
13、entionally physically non-interchangeable. This standard specifies the following: a) the form and dimensions for a C type “contact” coupling and for the self-sealing valve, operating probe and operating adaptor that shall be fitted to one or the other of the members of the coupling to enable it to b
14、e used on the service or emergency line of a two-line or three-line air pressure system; b) the form and dimensions for a CA type “contact” coupling and for the self-sealing valve on the female coupling to enable it to be used on the secondary line of a three-line air pressure brake system; c) the g
15、eneral layout and location of flexible hoses/tubes and C type couplings for vehicles using a two-line air pressure brake system and of the additional secondary line and CA type coupling used in a three-line system. 2 References The following standards publications are referred to in this standard. B
16、S 3643, ISO metric screw threads Part 3: Limits and tolerances for fine pitch threads (constant pitch series). BS 5409, Specification for nylon tube Part 2: Plasticized and unplasticized nylon tubing types 11 and 12 for use primarily in the automobile industry. 3 General requirements 3.1 Introductio
17、n. The requirements of this standard apply equally to both two- and three-line air pressure brake systems, except that in the case of a two-line system, the secondary line, its couplings and its stowing device shall be omitted. 3.2 Manufacturers responsibility. The manufacturer of the trailer shall
18、supply and fit the pipes and couplings on the trailer and shall provide hoses in the case of drawbar trailers. Every trailer shall be fitted with an operating adaptor on the service line coupling whether or not the trailer is intended to be coupled to a towing vehicle with a self-sealing valve. Whoe
19、ver installs the fifth wheel or towing hook on the chassis shall supply, and fit on to the towing vehicle, the couplings and self-sealing valves, and for articulated operation, the flexible tubes and their stowing devices. The manufacturer of the towing vehicle shall supply and fit temporary blankin
20、g plugs to the female threaded ends of the fixed pipes, ready for flexible tube connections, for articulated operation, or for the couplings, in the case of drawbar combinations. NOTEWhen vehicles are uncoupled, the connecting tubes/hoses should be safely housed in their stowing devices. 3.3 Colour
21、coding. If a colour is used for a line, it shall be as follows: a) service line, yellow or orange; b) emergency line, red; c) secondary line, blue. 3.4 Couplings 3.4.1 General. The type of coupling to be used on each line at the appropriate location shall be as specified in Table 1. The couplings sh
22、all comply with the form and dimensions specified in the figure referred to in the relevant entry of Table 1. As a requirement of Table 1, all couplings that are fitted to, or have a fixed connection with the towing vehicle shall have a self-sealing valve. With reference to Figure 1 to Figure 6, all
23、 couplings shall be threaded to a depth of 15 mm full length of thread. Some entries in Table 1 specify the inclusion of a self-sealing valve or operating adaptor in the coupling; the requirements for these components are as follows. 3.4.2 Self-sealing valve. A male coupling fitted with a self-seali
24、ng valve shall be so arranged to open only when the assembly is connected to a female coupling. A female coupling fitted with a self-sealing valve shall be so arranged to open only when the assembly is connected to a male coupling. A male coupling (fitted with a self-sealing valve) on a service line
25、 shall be conspicuously marked to ensure that the assembly is coupled only to a female coupling that has an operating adaptor. 3.4.3 Operating adaptor. The operating adaptor fitted to the female coupling of a service line shall be of the type shown in Figure 2 and shall incorporate an integral tip.
26、The tip shall be so arranged that it will open the self-sealing valve in the male member when the assembly is connected to it. For this purpose, the integral tip of the adaptor shall: a) be positioned according to the dimension specified in Figure 2(a); and b) be so shaped that it projects into the
27、nozzle of the male member without fouling it; and Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:49:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 138a:1980 2 BSI 02-2000 Table 1 Couplings c) offer the minimum restriction to the flow of air; and d) be s
28、ufficiently robust or of a material to resist the effects of corrosion. 4 Articulated vehicles 4.1 Arrangement and location of braking connections. Braking connections on articulated vehicles shall consist of: a) fixed pipes on the towing vehicle; b) flexible tubes attached to these pipes; c) flexib
29、le tube stowing devices mounted on the towing vehicle; d) for each line, a set of mating couplings, one of which is attached to the flexible tube, the other being fixed to the semi-trailer. The coupling interface shall thus be at the semi-trailer. The location of the braking connections, flexible tu
30、bes and stowing devices on the towing vehicles and semi-trailers using the two- or three-line system shall be as shown in Figure 7. NOTEThe flexible tube supports are not shown in Figure 7 and should be located in a convenient position (see 4.3.2). Dimensions shown in Figure 7 shall be as specified
31、in Table 2. Table 2 Summary of dimensions for articulated vehicles 4.2 Fixed couplings on semi-trailer 4.2.1 Horizontal location of couplings. The couplings for the service line and emergency line shall be fitted on the front of the semi-trailer as nearly as practicable equidistant from the vertical
32、 centreline of the semi-trailer and from 200 mm to 400 mm apart (dimension G). The secondary line coupling shall be between the service and emergency couplings. 4.2.2 Height of couplings. The couplings shall project at an angle of 0 to 15 downwards from the horizontal and the height to the centrelin
33、e of the couplings when fitted shall be between 50 mm and 600 mm above the face of the fifth wheel (dimension B). 4.3 Fixed connection on towing vehicle 4.3.1 Pipes 4.3.1.1 Horizontal location of pipes. The towing vehicle shall be fitted with three pipes as shown in Figure 7. The service line pipe a
34、nd emergency line pipe shall be fitted as nearly as practicable equidistant from the centreline of the towing vehicle and from 200 mm to 400 mm apart (dimension G). The pipe for the secondary line shall be between the service pipe and emergency pipe. 4.3.1.2 Bore. The pipes shall have a nominal bore
35、 of 9 mm for the service line and the emergency line, and 12 mm for the secondary line. 4.3.1.3 Pipe ends. The pipe ends shall have an M22 1.56H female thread complying with the requirements of BS 3643-3 and shall be tapped to a depth of 15 mm full length of thread. Coupling location Coupling type S
36、ervice lineEmergency lineSecondary line Articulated vehicle Coupling on semi-trailer Female C type + operating adaptor (Figure 2) Male C type (Figure 3) Male CA type (Figure 6) Coupling on rear of flexible tube Male C type + self-sealing valve (Figure 1) Female C type + self-sealing valve (Figure 4)
37、 Female CA type + self-sealing valve (Figure 5) Drawbar combination Coupling on towing vehicle Male C type + self-sealing valve (Figure 1) Female C type + self-sealing valve (Figure 4) Female CA type + self-sealing valve (Figure 5) Coupling on front of trailer-mounted hose Female C type + operating
38、adaptor (Figure 2) Male C type (Figure 3) Male CA type (Figure 6) Dimension (see Figure 7) ABCG mmmmmmmm 50 to 15050 to 600200 to 400H +150 0 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:49:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 138a:1980 BSI
39、02-20003 4.3.2 Flexible tube stowing devices. Stowing devices shall be provided on the back of the cab, shall support the flexible tubes as far as is possible clear of the chassis frame of the towing vehicle when they are not connected to the semi-trailer, shall afford adequate protection against da
40、mage and shall inhibit entry of moisture and dirt. 4.4 Flexible tubes 4.4.1 Type, attachment and support. The tube shall be flexible nylon tube complying with the requirements of BS 5409-2. The coiled nylon tube shall be arranged generally as shown in Figure 7. Any support shall be flexible, such th
41、at the slack of the tube does not make contact with any part of the towing vehicle or its fittings. 4.4.2 Tube ends. The ends of the towing vehicle-mounted tubes that are to receive the couplings shall be male M22 1.56g threaded connections, threaded to a length of 12 mm, complying with the requirem
42、ents of BS 3643-3. 4.4.3 Dimensions 4.4.3.1 Bore. The nominal bore of the flexible tube shall be as follows: a) for service line and emergency line, 9 mm; b) for secondary line, 12 mm. 4.4.3.2 Length. The coiled nylon tube shall be of sufficient length so that it will readily stretch to the dimensio
43、n J plus 750 mm, where J is the distance from the back of the cab (or any projection from the cab likely to foul the semi-trailer) to the centreline of the rear axle, as shown in Figure 7. 4.5 Tilt cabs. Special provision shall be made for the tube supports and stowage devices on an articulated vehi
44、cle with a tilt cab. 5 Drawbar combinations 5.1 Arrangement and location of braking connections. Braking connections on drawbar combinations shall consist of: a) flexible hoses taken directly from the trailer forecarriage; b) stowing devices mounted on the drawbar trailer; c) for each line, a set of
45、 mating couplings, one of which is attached to the flexible hose, the other being fitted to the towing vehicle. The coupling interface shall thus be at the towing vehicle. The location of the braking connections and flexible hoses on the towing vehicles and drawbar trailers using the two- or three-l
46、ine system shall be as shown in Figure 8. NOTEThe flexible hose supports are not shown in Figure 8 and should be located in a convenient position (see 5.3.2). 5.2 Fixed couplings on towing vehicle 5.2.1 Horizontal location of couplings. The couplings for the service line and emergency line shall be
47、fitted on the rear of the towing vehicle as nearly as practicable equidistant from the vertical centreline of the vehicle and from 550 mm to 700 mm apart (dimension C), located as shown in Figure 8. The secondary line shall be on the same side as the emergency coupling. Dimension Z shall be 75 mm mi
48、nimum. The face of the fixed part of the female C type coupling to the centreline of the towing pin (dimension B) shall be 150 mm maximum and 50 mm minimum, with the other couplings mounted approximately in line, as shown in Figure 8. 5.2.2 Height of couplings. The couplings shall project at an angl
49、e of 0 to 15 downwards from the horizontal and shall all be on the same horizontal plane. The centreline of the couplings shall be 200 mm maximum and 0 mm minimum vertically below the centreline of the towing jaw (dimension A). 5.3 Pipes and connections on drawbar trailer 5.3.1 Pipes and hoses 5.3.1.1 Location. Flexible hoses shall be run directly from the trailer forecarriage, and shall be secured at a point near the apex of the drawbar (see Figure 8). The length of hoses shall be such that, when coupled to
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