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1、BRITISH STANDARD AUTOMOBILE SERIES BS AU 3:1970 Specification for Clearance dimensions and fifth wheel positions for tractors and semi-trailers UDC 629.114.2.013.6 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:39:58 GMT+00:00 2006, Uncontrolled Copy, (c) BS
2、I BS AU 3:1970 This British Standard, having been approved by the Automobile Industry Standards Committee, was published under the authority of the Executive Board of the Institution on 20 March 1970 BSI 09-1999 The following BSI reference relates to the work on this standard: Committee reference AU
3、E/- ISBN 580 05967 7 Foreword This British Standard, prepared under the authority of the Automobile Industry Standards Committee of the BSI, was first published in 1963 and later revised in 1968 to assist interchangeability of tractors and semi-trailers to the weights and dimensions permitted by the
4、 Motor Vehicles (Construction and Use) Regulations No. 321:1969. The present revision incorporates additional data for articulated vehicles considered necessary as a result of experience in the use of the standard. Trailer manufacturers will note that the application of this standard depends upon th
5、e knowledge of the dimensions of the towing vehicles. Users will note that the physical interchangeability between the towing vehicle and the semi-trailer does not itself ensure compatibility of load carrying, braking, lighting and overall length. It is important that the equipment be so designed th
6、at semi-trailers will couple easily and satisfactorily with the towing vehicle, and not slope forward when the fifth wheel is mounted in accordance with the dimensions given in this standard. NOTEThe values specified in imperial units are to be regarded as the standard. The metric units are given as
7、 approximate equivalents. 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 page
8、s This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4 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. Amendments issued sinc
9、e publication Amd. No.Date Comments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:39:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 3:1970 BSI 09-1999i Contents Page ForewordInside front cover 1Scope1 2Dimensions1 3Articulation2 4Heights2 Figure 1 Dime
10、nsions of towing vehicle with single rear axle and of semi-trailer3 Figure 2 Clearance dimensions between towing vehicle and semi-trailer to permit specified articulation4 Table 1 Preferred dimensions for single axle semi-trailers in articulated vehicles not exceeding 20 tons and tandem axle semi-tr
11、ailers in articulated vehicles not exceeding 24 tons gross train weight1 Table 2 Preferred dimensions for single axle semi-trailers in articulated vehicles exceeding 20 tons and tandem axle semi-trailers in articulated vehicles exceeding 24 tons gross vehicle weight2 Table 3 Towing vehicle with sing
12、le rear axle height to face of fifth wheel from ground vehicle unladen and uncoupled3 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:39:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London South Bank University, London South Bank Univ
13、ersity, Sat Dec 09 03:39:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 3:1970 BSI 09-19991 1 Scope 1.1 This British Standard specifies clearance dimensions and the positions and heights of fifth wheel attachments fitted to the tractive units of articulated vehicles for the purpose of coupling
14、semi-trailers. It relates to towing vehicles with single rear axles not exceeding 2.5 metres width and to semi-trailers fitted with king pins complying with BS AU 11). 1.2 The standard applies to vehicles in normal road use and excludes vehicles used under cross-country conditions. 2 Dimensions The
15、basic dimensions shall be as given in Table 1, Table 2 and Table 3, with reference to Figure 1 and Figure 2. Table 1 and Table 2 give preferred dimensions for the tractors and semi-trailers as follows: NOTESubject to agreement between the user and the manufacturer, and where special conditions exist
16、, the dimensions given in either Table 1 or Table 2 may be selected as alternatives. Table 3: gives the heights of the fifth wheel face from the ground. Table 1 Preferred dimensions for single axle semi-trailers in articulated vehicles not exceeding 20 tons and tandem axle semi-trailers in articulat
17、ed vehicles not exceeding 24 tons gross train weight 1) BS AU 1, “Dimensions of 2 2+ in diameter fifth wheel king pin for use with semi-trailers”. Table 1: preferred dimensions for single axle semi-trailers in articulated vehicles not exceeding 20 tons and tandem axle semi-trailers not exceeding 24
18、tons gross train weights. Table 2: preferred dimensions for single axle semi-trailers in articulated vehicles exceeding 20 tons and tandem axle semi-trailers in articulated vehicles exceeding 24 tons gross train weights. DetailSymbolDimensions inmm Position of fifth wheel from centre of rear axleD m
19、in. D max. 6 min. 12 max. 150 min. 305 max. Distance from point C on clearance plane at back of cab to centre line of rear axle CA64 min.1 625 min. Distance from centre line of king-pin to point C on clearance plane at back of cab or other chassis equipment CA-D58 min.1 475 min. Distance from fifth
20、wheel to extreme rearwards projection of vehicle X160 max.1 525 max. Distance from king-pin to extreme forward projection of semi-trailer Y54 max.1 370 max. Distance from king-pin rearwards to any projection likely to foul towing vehicle Z63 min.1 600 min. Distance from fifth wheel face to point C o
21、n clearance planeh4100 Angle of forward inclination of clearance plane from point C88 Maximum flat width of back of cab to permit 100 articulation of semi-trailer W61.5 max.1 560 max. Clearance angle at sides of rear of cab to permit 100 articulation of semi-trailer 10 min.10 min. Licensed Copy: Lon
22、don South Bank University, London South Bank University, Sat Dec 09 03:39:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 3:1970 2 BSI 09-1999 Table 2 Preferred dimensions for single axle semi-trailers in articulated vehicles exceeding 20 tons and tandem axle semi-trailers in articulated vehicle
23、s exceeding 24 tons gross vehicle weight 3 Articulation Care shall be taken to ensure that when working to the positions and heights shown in the tables there shall be no fouling between the rear of the towing vehicle and its mudguards and the adjacent parts of the semi-trailer at a fore and aft art
24、iculation of up to plus and minus 8 from the designed static position when the combination is in a straight line. The clearance plane passing through point C (see Figure 2) at the back of the cab is a flat transverse plane sloping forward from point C at an angle of 8 as shown and is intended to pro
25、vide clearance for the 8 fore and aft articulation requirement, and for semi-trailer clearance over chassis equipment mounted at the back of the tractor cab. The cab profile shown in Figure 2 permits a maximum semi-trailer articulation of 100. The clearances of vehicles built to the dimensions in Ta
26、ble 2 are such that the flat back of cab may extend to the full legal width of 2.5 metres. 4 Heights The heights of the fifth wheel face from the ground, with the vehicle unladen and uncoupled, shall be as given in Table 3 when the fifth wheel is set at a minimum of 6 in (150 mm) and a maximum of 27
27、 in (685 mm) forward of the rear axle centre line. The heights of intermediate positions shall be determined on a sloping line between the position 6 in (150 mm) forward of the rear axle centre-line and the position 27 in (685 mm) forward of the rear axle centre-line. NOTE 1These heights are based o
28、n the towing vehicle rear springs having a deflection of approximately 3 in (75 mm) laden to unladen. NOTE 2It is emphasized that advantage should be taken of the height tolerances specified only in extreme cases where coupling could not be otherwise effected. DetailSymbolDimensions inmm Position of
29、 fifth wheel from centre of rear axleD min. D max. 12 min. 27 max. 305 min. 685 max. Distance from point C on clearance plane at back of cab to centre line of rear axle CA76 min.1 930 min. Distance from centre line of king-pin to point C on clearance plane at back of cab or other chassis equipment C
30、A-D64 min.1 625 min. Distance from fifth wheel to extreme rearwards projection of towing vehicle X278 max.1 980 max. Distance from king-pin to extreme forward projection of semi-trailerY60 max.1 525 max. Distance from king-pin rearwards to any projection likely to foul towing vehicle Z81 min.2 060 m
31、in. Distance from fifth wheel face to point C on clearance planeh4100 Angle of forward inclination of clearance plane from point C88 Maximum flat width of back of cab to permit 100 articulation of semi-trailer W98.5 max.2 500 max. Clearance angle at sides of rear of cab to permit 100 articulation of
32、 semi-trailer ZeroZero Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:39:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 3:1970 BSI 09-19993 Table 3 Towing vehicle with single rear axle height to face of fifth wheel from ground vehicle unladen and uncoup
33、led (see Figure 1) (United Kingdom and overseas) Tyre size Dimensions H at D = 6 in (150 mm) at D = 27 in (685 mm) inmminmm 7.50 20 8.25 20 or tyres of equivalent diameter 471 195501 270 9.00 20 or tyres of equivalent diameter 48.51 23051.51 310 10.0 20 or tyres of equivalent diameter 501 270531 350
34、 11.0 20 or tyres of equivalent diameter 51.51 31054.51 385 NOTEThe dimensions for H in this table are subject to a tolerance of plus and minus 1 in (25 mm). Figure 1 Dimensions of towing vehicle with single rear axle and of semi-trailer Licensed Copy: London South Bank University, London South Bank
35、 University, Sat Dec 09 03:39:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 3:1970 4 BSI 09-1999 Figure 2 Clearance dimensions between towing vehicle and semi-trailer to permit specified articulation Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:39:58
36、 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 5blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:39:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 3:1970 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent
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