1、BRITISH STANDARD AUTOMOBILE SERIES BS AU 3:1970 Specification for Clearance dimensions and fifth wheel positions for tractors and semi-trailers UDC 629.114.2.013.6BSAU3:1970 This British Standard, having been approved by the AutomobileIndustry StandardsCommittee, was published under the authorityoft
2、he Executive Boardof the Institution on 20March1970 BSI 09-1999 The following BSI reference relates to the work on this standard: Committee reference AUE/- ISBN 580 05967 7 Foreword This British Standard, prepared under the authority of the Automobile Industry Standards Committee of the BSI, was fir
3、st published in1963 and later revised in1968 to assist interchangeability of tractors and semi-trailers to the weights and dimensions permitted by the Motor Vehicles (Construction and Use) Regulations No.321:1969. The present revision incorporates additional data for articulated vehicles considered
4、necessary as a result of experience in the use of the standard. Trailer manufacturers will note that the application of this standard depends upon the knowledge of the dimensions of the towing vehicles. Users will note that the physical interchangeability between the towing vehicle and the semi-trai
5、ler does not itself ensure compatibility of load carrying, braking, lighting and overall length. It is important that the equipment be so designed that semi-trailers will couple easily and satisfactorily with the towing vehicle, and not slope forward when the fifth wheel is mounted in accordance wit
6、h 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 approximate equivalents. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are res
7、ponsible for their correct application. 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 4 and a back cover. This standard has been updated (see copy
8、right date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSAU3:1970 BSI 09-1999 i Contents Page Foreword Inside front cover 1 Scope 1 2 Dimensions 1 3 Articulation 2 4 Heig
9、hts 2 Figure 1 Dimensions of towing vehicle with single rear axle and of semi-trailer 3 Figure 2 Clearance dimensions between towing vehicle and semi-trailer to permit specified articulation 4 Table 1 Preferred dimensions for single axle semi-trailers in articulated vehicles not exceeding 20 tons an
10、d tandem axle semi-trailers in articulated vehicles not exceeding 24 tons gross train weight 1 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 weight 2 Table 3 T
11、owing vehicle with single rear axle height to face of fifth wheel from ground vehicle unladen and uncoupled 3ii blankBSAU3:1970 BSI 09-1999 1 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 arti
12、culated vehicles for the purpose of coupling semi-trailers. It relates to towing vehicles with single rear axles not exceeding2.5metres width and to semi-trailers fitted with king pins complying with BSAU1 1) . 1.2 The standard applies to vehicles in normal road use and excludes vehicles used under
13、cross-country conditions. 2 Dimensions The 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 manuf
14、acturer, and where special conditions exist, 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 notexceeding 20 tons
15、and tandem axle semi-trailers in articulated vehicles not exceeding 24 tons gross train weight 1) BS AU1, “Dimensions of2 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 exceeding20tons and tande
16、m axle semi-trailers not exceeding24tons gross train weights. Table 2: preferred dimensions for single axle semi-trailers in articulated vehicles exceeding20tons and tandem axle semi-trailers in articulated vehicles exceeding24tons gross train weights. Detail Symbol Dimensions in mm Position of fift
17、h wheel from centre of rear axle D min. 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 CA 64 min. 1625 min. Distance from centre line of king-pin to point C on clearance plane at back of cab or other chassis equipment CA-D
18、58 min. 1475 min. Distance from fifth wheel to extreme rearwards projection of vehicle X 1 60 max. 1525 max. Distance from king-pin to extreme forward projection of semi-trailer Y 54 max. 1370 max. Distance from king-pin rearwards to any projection likely to foul towing vehicle Z 63 min. 1 600 min.
19、Distance from fifth wheel face to point C on clearance plane h 4 100 Angle of forward inclination of clearance plane from point C 8 8 Maximum flat width of back of cab to permit 100 articulation of semi-trailer W 61.5 max. 1560 max. Clearance angle at sides of rear of cab to permit 100 articulation
20、of semi-trailer 10 min. 10 min.BSAU3:1970 2 BSI 09-1999 Table 2 Preferred dimensions for single axle semi-trailers in articulated vehiclesexceeding20 tons and tandem axle semi-trailers in articulated vehicles exceeding 24 tonsgrossvehicle weight 3 Articulation Care shall be taken to ensure that when
21、 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 articulation of up to plus and minus8 from the designed static position when the combination is in
22、 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 of8 as shown and is intended to provide clearance for the8 fore and aft articulation requirement, and for semi-trailer clearance ove
23、r chassis equipment mounted at the back of the tractor cab. The cab profile shown in Figure 2 permits a maximum semi-trailer articulation of100 . The clearances of vehicles built to the dimensions in Table 2 are such that the flat back of cab may extend to the full legal width of2.5metres. 4 Heights
24、 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 of6in (150 mm) and a maximum of27in(685mm) forward of the rear axle centre line. The heights of intermediate positions shall be determin
25、ed on a sloping line between the position6in (150mm) forward of the rear axle centre-line and the position27in (685mm) forward of the rear axle centre-line. NOTE 1These heights are based on the towing vehicle rear springs having a deflection of approximately3 in (75mm) laden to unladen. NOTE 2It is
26、emphasized that advantage should be taken of the height tolerances specified only in extreme cases where coupling could not be otherwise effected. Detail Symbol Dimensions in mm Position of fifth wheel from centre of rear axle D min. D max. 12 min. 27 max. 305 min. 685 max. Distance from point C on
27、clearance plane at back of cab to centre line of rear axle CA 76 min. 1930 min. Distance from centre line of king-pin to point C on clearance plane at back of cab or other chassis equipment CA-D 64 min. 1625 min. Distance from fifth wheel to extreme rearwards projection of towing vehicle X 2 78 max.
28、 1 980 max. Distance from king-pin to extreme forward projection of semi-trailer Y 60 max. 1 525 max. Distance from king-pin rearwards to any projection likely to foul towing vehicle Z 81 min. 2 060 min. Distance from fifth wheel face to point C on clearance plane h 4 100 Angle of forward inclinatio
29、n of clearance plane from point C 8 8 Maximum flat width of back of cab to permit 100 articulation of semi-trailer W 98.5 max. 2500 max. Clearance angle at sides of rear of cab to permit 100 articulation of semi-trailer Zero ZeroBSAU3:1970 BSI 09-1999 3 Table 3 Towing vehicle with single rear axle h
30、eight to face of fifth wheel from ground vehicle unladen and uncoupled (see Figure 1) (United Kingdom and overseas) Tyre size Dimensions H at D = 6 in (150 mm) at D = 27 in (685 mm) in mm in mm 7.50 20 8.25 20 or tyres of equivalent diameter 47 1195 50 1270 9.00 20 or tyres of equivalent diameter 48
31、.5 1 230 51.5 1310 10.0 20 or tyres of equivalent diameter 50 1270 53 1350 11.0 20 or tyres of equivalent diameter 51.5 1310 54.5 1385 NOTEThe dimensions for H in this table are subject to a tolerance of plus and minus1in (25mm). Figure 1 Dimensions of towing vehicle with single rear axle and of sem
32、i-trailerBSAU3:1970 4 BSI 09-1999 Figure 2 Clearance dimensions between towing vehicle and semi-trailer topermitspecifiedarticulation5 blankBS AU 3:1970 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStand
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