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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS AU 138b:2000 ICS 43.04
2、0.70; 43.080.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Towing vehicle, trailer and semi-trailer pneumatic braking systems Contact type couplings Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:11:22 GMT+00:00 2006, Uncontrolled
3、 Copy, (c) BSI This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 April 2000 BSI 04-2000 The following BSI references relate to the work on this standard: Commit
4、tee reference AUE/11 Draft for comment 99/708253 DC ISBN 0 580 33150 4 BS AU 138b:2000 Amendments issued since publication Amd. No.DateComments Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee AUE/11, Braking systems, upon
5、 which the following bodies were represented: British Friction Materials Council Department of Environment, Transport and the Regions Freight Transport Association Motor Industry Research Association National Caravan Council Ltd. Society of Motor Manufacturers and Traders Ltd. Transport and General
6、Workers Union Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:11:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 138b:2000 BSI 04-2000i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2References1 3General requirements1 4Semi-tra
7、iler combinations2 5Drawbar combinations2 6Performance2 7In service repair and inspection3 8Marking3 Bibliography9 Figure 1 Male C type coupling incorporating self-sealing valve4 Figure 2 Female C type coupling incorporating self-sealing valve5 Figure 3 Female CA type coupling incorporating self-sea
8、ling valve6 Figure 4 Female C type coupling incorporating valve lifter7 Figure 5 Male C type coupling8 Figure 6 Male CA type coupling8 Table 1 Couplings2 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:11:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii BSI 0
9、4-2000 BS AU 138b:2000 Foreword This British Standard has been prepared by Technical Committee AUE/11. It supersedes BS AU 138a:1980 which is withdrawn. BSAU5:1963, although partially superseded by BS AU 138a:1980, remains current for vacuum braking systems. NOTEFrom 1 April 1989 The Road Vehicles (
10、Construction and Use) Regulations 1986 require that all new towing vehicles have air line couplings that incorporate self-sealing valves. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct applicatio
11、n. 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 1 to 9 and a back cover. The BSI copyright notice displayed in this document indicates when the docume
12、nt was last issued. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:11:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 04-20001 BS AU 138b:2000 1 Scope This British Standard specifies the dimensions required for correct mating of contact type couplings for
13、connecting the pneumatic braking system of towing vehicles to trailers or semi-trailers. If not specifically dimensioned, the couplings may follow a form to suit the manufacturer. This British Standard also specifies performance requirements for the couplings, identity markings, serviceability, insp
14、ections, and maintenance. The layout and position of the couplings on the vehicle are defined in BS AU 195a:1991 and are not incorporated in this revised British Standard. Rubber hose assemblies are specified in BS AU 110a:1995 and are not incorporated in this revised British Standard. Coiled pipe a
15、ssemblies are specified in ISO 7375-1:1996, ISO 7375-2:1998, ISO 7628-1:1998, and ISO 7628-2:1998, and are not incorporated in this revised British Standard. This British Standard applies to two-line pneumatic braking systems and to three line pneumatic braking systems that include a secondary line.
16、 This British Standard specifies C type and CA type contact couplings. C type couplings are used in two line braking systems, and the CA type exclusively for the secondary line of a three line braking system. Each of the assemblies specified in this British Standard are intentionally physically non-
17、interchangeable. It is further intended that each of the assemblies cannot be dismantled or repaired. This British Standard specifies the following: a) the form and dimensions of the mating parts of the C type contact coupling and for the self-sealing valve and valve lifter to be incorporated in the
18、 coupling, to enable it to be used on the control or on the supply line of a two-line or three-line pneumatic braking system; b) the form and dimensions of the mating parts of the CA type contact coupling and for the self-sealing valve incorporated into the female coupling, to enable it to be used o
19、n the secondary line of a three-line pneumatic braking system. 2 References The following normative documents contain provisions that, through reference in this text, constitute provisions of this British Standard. For dated references, subsequent amendments to, or revisions of, any of these publica
20、tions do not apply. For undated references, the latest edition of the publication referred to applies. BS 3643 (all parts), ISO Metric screw threads. BS 7479:1991, Methods for salt spray tests in artificial atmosphere. BS AU 195a:1991, Specification for mounting electrical connections on rear cross
21、member of towing vehicles. BS AU 110a:1995, Specification for rubber hoses and hose assemblies for automotive air pressure braking systems. ISO 7375-1:1996, Road vehicles Coiled pipe assemblies for pneumatic braking connection between motor vehicles and towed vehicles Part 1: Dimensions. ISO 7375-2:
22、1998, Road vehicles Coiled pipe assemblies for pneumatic braking connection between motor vehicles and towed vehicles Part 2: Performance requirements. ISO 7628-1:1998, Road vehicles thermoplastics tubing for air braking systems Part 1: Dimensions and marking. ISO 7628-2:1998, Road vehicles thermopl
23、astics tubing for air braking systems Part 2: Mounting on vehicle and test methods. 3 General requirements 3.1 Manufacturers responsibility The manufacturer of a semi-trailer shall supply and fit the couplings rigidly on to the fixed pipes of the trailer. For drawbar trailers, the manufacturer shall
24、 supply the couplings fitted to coiled pipe assemblies or flexible hoses that are connected to the fixed pipes of the trailer. The control line of each trailer shall be fitted with a coupling that incorporates a valve lifter. The manufacturer of the towing vehicle shall supply and fit on the towing
25、vehicle, the couplings incorporating self-sealing valves, and for towing vehicles for semi-trailers, the coiled pipe assemblies. The manufacturer of the towing vehicle shall also provide suitable means to prevent water and dirt ingress when the vehicles are uncoupled and, if relevant, suitable means
26、 to stow the couplings to prevent damage. 3.2 Colour coding The couplings shall be coloured or colour coded with a permanent tag or identifying collar as follows: a) control line (also called service or signal line): yellow; b) supply line (also called emergency line): red; c) secondary line (also c
27、alled auxiliary line): blue. 3.3 Couplings 3.3.1 General Types of coupling for each line and appropriate locations shall conform to Table 1. Couplings shall conform to the form and dimensions specified for the mating parts in Figures 1 to 6 as specified in Table 1. All couplings fitted to the towing
28、 vehicle, either directly or by means of flexible hoses or coiled pipe assemblies, shall incorporate a self-sealing valve. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:11:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 BSI 04-2000 BS AU 138b:2000 Table 1 C
29、ouplings Type of vehicle combination Coupling locationControl line couplingSupply line couplingSecondary line coupling Semi-trailerTractor (on end of flexible hose) Male C incorporating self-sealing valve (Figure 1) Female C incorporating self-sealing valve (Figure 2) Female CA incorporating self-se
30、aling valve (Figure 3) Semi-trailerFemale C incorporating valve lifter (Figure 4) Male C (Figure 5)Male CA (Figure 6) DrawbarTowing vehicleMale C incorporating self-sealing valve (Figure 1) Female C incorporating self-sealing valve (Figure 2) Female CA incorporating self-sealing valve (Figure 3) Tra
31、iler (on end of flexible hose) Female C incorporating valve lifter (Figure 4) Male C (Figure 5)Male CA (Figure 6) 3.3.2 Self-sealing valve/valve lifter Male couplings incorporating a self-sealing valve shall be arranged to open only when the assembly is connected to a female coupling incorporating a
32、 valve lifter (see Figures 1 and 4). Female couplings incorporating a self-sealing valve shall be arranged to open only when the assembly is connected to a male coupling see Figures 2 and 5 (C type) and Figures 3 and 6 (CA type). The valve shall automatically reseal when uncoupled from the mating co
33、upling. 3.3.3 Threads Couplings threaded to fit to fixed pipes or coiled pipe assemblies or flexible hoses of the towing vehicle or trailer shall be threaded M22 3 1.5 or M16 3 1.5 as specified in BS 3643. With reference to Figures 1 to 6, all couplings that incorporate a threaded entry shall be thr
34、eaded to a minimum full thread length of 15 mm. 3.3.4 Method of connection to the pneumatic braking pipes Couplings connected by a thread shall conform to 3.3.3. Connections shall show no signs of leakage when immersed in water and pressurized to 10 bar. 4 Semi-trailer combinations 4.1 Connections C
35、onnections of air braking lines shall consist of a set of mating couplings conforming to Table 1. One of the couplings shall be attached to the coiled pipe assembly on the towing vehicle and the other fixed to the semi-trailer. The coupling interface shall be at the semi-trailer. The flexible coiled
36、 pipe assembly shall be connected to the fixed pipes on the towing vehicle. 4.2 Stowage devices The vehicle shall be equipped with stowage devices that prevent damage, dirt or water ingress for each coupling and coiled hose. The couplings on the semi-trailer shall have plugs/covers fixed to the semi
37、-trailer that prevent dirt or water ingress. 5 Drawbar combinations 5.1 Connections Connections of each of the air braking lines between towing vehicle and trailer shall consist of a set of mating couplings conforming to Table 1. One of the couplings shall be attached to the coiled pipe assembly or
38、flexible hose on the trailer, and the other fixed to the towing vehicle. The coupling interface shall be at the towing vehicle. The coiled pipe assembly or flexible hose shall be connected to the fixed pipes on the trailer. 5.2 Stowage devices The trailer shall be equipped with stowage devices, that
39、 prevent damage, dirt or water ingress, for each coupling and coiled pipe assembly or flexible hose. The couplings on the towing vehicle shall have plugs/covers fixed to the towing vehicle to prevent dirt or water ingress. 6 Performance 6.1 Flow Couplings shall have minimum bores of 8 mm diameter. T
40、he flow area created in the self-sealing valve by a lift of at least 3 mm of the internal slider assembly shall not be less than 100 mm2. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:11:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 04-20003 BS AU 138b:
41、2000 6.2 Corrosion resistance The external surfaces of couplings shall show at least 96 h external neutral salt spray resistance when tested in accordance with BS 7479:1991. 6.3 Low temperature performance It shall be possible to couple then uncouple and recouple the couplings at all temperatures in
42、 the range 220 8C to +50 8C while pressurized to 8.5 bar at the self-sealing valve. 6.4 Durability of components 6.4.1 Load test With the internal slide or valve lifter held rigidly at area B of Figures 1, 2, 3, and 4, the internal slider or valve lifter shall be able to withstand a progressively ap
43、plied load of 300 N in direction A applied on the area of contact with the mating part (area X), at 220 8C and +50 8C, without failure or permanent deformation greater than 0.1 mm in direction A. The load shall be maintained for 1 min. 6.4.2 Shock load test With the internal slide or valve lifter he
44、ld vertically and rigidly at area B of Figures 1, 2, 3, and 4, the internal slider or valve lifter shall be able to withstand a shock load of 4 kg dropped from a height of 80 mm in direction A onto the area of contact with the mating part (area X), at 220 8C and +50 8C, without failure or permanent
45、deformation greater than 0.1 mm in direction A. 6.5 Leakage Test all couplings for leakage after final assembly. No leakage shall be visible to the naked eye when immersed in water and charged to a pressure of 8.5 bar for 10 s. Couplings that incorporate self-sealing valves shall be tested in the co
46、upled and uncoupled states. Couplings that do not incorporate self-sealing valves should be tested in the coupled state only. 7 In service repair and inspection Couplings conforming to this British Standard shall not be considered repairable and cannot be serviced. If any of the couplings shown in F
47、igures 1 to 6 is considered faulty then the coupling should be replaced entirely. The couplings shall be designed and assembled so that they cannot be readily disassembled. NOTECouplings should be inspected regularly for damage and wear. To facilitate regular inspections, suitable gauging should be
48、employed to accurately assess the mating dimensions shown in Figures 1 to 6. 8 Marking Couplings shall be permanently marked with the manufacturers identification mark and the date or manufacturers date code. Couplings shall be marked BS AU 138b:2000 to indicate conformity to this standard. Licensed
49、 Copy: London South Bank University, London South Bank University, Sat Dec 09 02:11:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 138b:2000 4 BSI 04-2000 Figure 1 Male C type coupling incorporating self-sealing valve Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:11:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 04-20005 BS AU 138b:2000 Figure 2 Female C type coupling incorporating self-sealing valve Licensed Copy: London South Bank University, London South Bank University, Sa