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1、BRITISH STANDARD AUTOMOBILE SERIES BS AU 241:1991 ISO 1726:1989 Specification for Mechanical coupling between tractors and semi-trailers: interchangeability Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:07:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU
2、 241:1991 This British Standard, having been prepared under the direction of the Automobile Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 30 April 1991 BSI 02-2000 The following BSI references relate to the work on this standard: Commit
3、tee reference AUE/13 Draft for comment 88/77118 DC ISBN 0 580 19418 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Automobile Standards Policy Committee (AUE/-) to Technical Committee AUE/13, upon which the following bodies were repre
4、sented: British Railways Board Bus and Coach Council Department of Transport Freight Transport Association Health and Safety Executive Institute of Road Transport Engineers (Incorporated) London Regional Transport Ministry of Defence Road Haulage Association Ltd. Society of Motor Manufacturers and T
5、raders Limited Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:07:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 241:1991 BSI 02-2000i Contents Page Committees responsibleInside front cover Nationa
6、l forewordii 1Scope1 2Interchangeability dimensions1 3Operating dimensions2 Annex A (informative) Bibliography5 Figure 1 Height of fifth wheel1 Figure 2 Horizontal position of fifth wheel1 Figure 3 Lateral inclination2 Figure 4 Free space between tractor and semi-trailer3 Figure 5 Gooseneck contour4
7、 Publication(s) referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:07:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 241:1991 ii BSI 02-2000 National foreword This British Standard has been prepared under the direction of the Au
8、tomobile Standards Policy Committee and is identical with ISO 1726:1989 “Road vehicles Mechanical coupling between tractors and semi-trailers Interchangeability” published by the International Organization for Standardization (ISO). The Technical Committee has reviewed the provisions of ISO 1728:198
9、0 and ISO 4086:1982, to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. There are no corresponding British Standards for ISO 1728 and ISO 4086. A British Standard does not purport to include all the necessary provisions of a co
10、ntract. 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 StandardCorresponding British Standard ISO 337:1981BS AU 1c:1989 Specification for dimensions
11、 of “50” fifth wheel king pin for semi-trailers (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated
12、. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:07:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 241:1991 BSI 02-20001 1 Scope This International Standard specifies the various e
13、lements and dimensions of a tractor vehicle and a coupled semi-trailer which together constitute an articulated vehicle, in order to ensure interchangeability. It specifies certain interchangeability dimensions of the gooseneck contour and operating dimensions relating to some angle values. The requ
14、irements of this International Standard permit use of the same semi-trailer with two-axle or three-axle tractors. NOTEThe dimensions of the 50 mm and 90 mm fifth-wheel coupling pins are specified in ISO 3371 and ISO 40862 respectively. Mounting zones for pneumatic braking couplings are specified in
15、ISO 17283. The articulated vehicles are intended for commercial transport of cargo of the greatest possible variety: this International Standard does not necessarily cover special combination types (e.g. high-cube vehicles, low-bed vehicles, tipper vehicles). Limitations of maximum gross mass and ov
16、erall dimensions are generally laid down by legislative requirements. 2 Interchangeability dimensions 2.1 Height of fifth wheel of laden tractor The height of the fifth wheel of a laden tractor above GRP, h (see Figure 1), in millimetres, shall be To establish conformity, the height of the fifth whe
17、el of the laden tractor, h, in millimetres, may be determined according to the following formula (see Figure 1, Figure 2 and Figure 3): h W 0,137 l1+ 0,095 b + r + r1 143,5 where l1is the distance between the coupling axis and the axis of the rearmost axle of the tractor; bis the total width of the
18、tyres at the rearmost axle of the tractor; ris the radius of the tyres, unladen; r1is the radius of the tyres, laden. 2.2 Height of fifth wheel of unladen tractor The height of the fifth wheel of an unladen tractor above GRP, h (see Figure 1) shall be 1 400 mm max. 2.3 Forward clearance zone radius
19、of semi-trailer The forward clearance zone radius of the semi-trailer, d (see Figure 4), shall be 2 040 mm max. 1 200 mm +100 50 mm. Figure 1 Height of fifth wheel Figure 2 Horizontal position of fifth wheel Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:07:
20、07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 241:1991 2 BSI 02-2000 2.4 Gooseneck contour The gooseneck shall be located on the outside of the surface of revolution generated about the vehicle coupling vertical axis, as shown in Figure 5 and described below. The generator is constituted as fo
21、llows: a part AB of length l2, situated in the horizontal plane of the centre of the coupling and in the median longitudinal plane of the semi-trailer; a part BC situated in the same median plane making an angle with the horizontal plane; an arc of a circle of radius r2, tangential on one hand to th
22、e portion BC previously defined and on the other hand to a vertical portion DE situated in the median at a distance and radius r3 from the coupling axis. During the rotation of the generator, AB describes a horizontal plane, BC describes a conical surface of revolution, the arc of the circle describ
23、es a portion of a torus, and the vertical axis DE describes a portion of the surface of a cylinder of revolution. The values adopted for these elements of the generator are as follows: l2= 750 mm = 4 r2= 450 mm r3= 2 300 mm These dimensions allow the determination of the centre of the circle of radi
24、us r2. 3 Operating dimensions 3.1 Angles of inclination of semi-trailer in relation to tractor The tractor shall be so constructed that the tractor and the semi-trailer components, except for those concerned with articulation, do not make contact with each other when the articulated vehicle is runni
25、ng in a straight line, when the angle of inclination of the semi-trailer relative to the tractor does not exceed the following values (see Figure 4): 1= 6 towards the front; 2= 7 towards the rear. For the purposes of the measurement of 1 and 2, the fifth-wheel plate is assumed to be situated in a ho
26、rizontal plane. The tractor shall be set at the attitude which corresponds to the design laden condition when the tractor is standing on a horizontal plane. 3.2 Lateral inclination When the trailer is at a lateral inclination, (see Figure 3), of a maximum of 3 relative to the tractor chassis, there
27、shall be no contact between the tractor chassis and the semi-trailer. Figure 3 Lateral inclination Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:07:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 241:1991 BSI 02-20003 3.3 Angle of articulation The angle
28、 of articulation, (see Figure 4), is the projection of the angle between the longitudinal axes of the tractor and semi-trailer in the horizontal plane. 3.3.1 The articulation of the vehicle shall be such that no contact is made between the semi-trailer and the tyres of the tractor, taking into accou
29、nt the maximum value 2= 7 for all angles up to 25, for both two-axle and three-axle tractors. 3.3.2 Under manoeuvring conditions, the angle of articulation shall be able to reach 90 and the angle of inclination 2 vary from 7 to 3 as the angle varies from 25 to 90. 3.4 Free space between tractor and
30、semi-trailer The free space between the tractor and semi-trailer is measured as follows (see Figure 4). 3.4.1 l3 is the distance between two cylinders of revolution, both having the kingpin axis as their axis. One of these cylinders has radius r3 (lower part of the gooseneck) and the other is the cy
31、linder of smallest radius within which all points of the rear part of the tractor are located: l3= 100 mm min. Figure 4 Free space between tractor and semi-trailer Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:07:07 GMT+00:00 2006, Uncontrolled Copy, (c) BS
32、I BS AU 241:1991 4 BSI 02-2000 3.4.2 l4 is the clearance between the surface of the cylinder of revolution having as its axis the axis of the fifth wheel coupling, and of radius d, and a conical surface of revolution having the same axis. This conical surface is generated by a line making an angle o
33、f 6 from the vertical towards the front of the tractor. A point X of this surface is positioned on the plane of symmetry of the semi-trailer at a height of 250 mm above the fifth-wheel coupling face. At this point, l4= 80 mm min. Figure 5 Gooseneck contour Licensed Copy: London South Bank University
34、, London South Bank University, Sat Dec 09 02:07:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 241:1991 BSI 02-20005 Annex A (informative) Bibliography 1 ISO 337:1981, Road vehicles 50 semi-trailer fifth wheel coupling pin Basic and mounting/interchangeability dimensions. 2 ISO 4086:1982, Road
35、 vehicles 90 semi-trailer fifth wheel coupling pin Basic and mounting/interchangeability dimensions. 3 ISO 1728:1980, Road vehicles Pneumatic braking connections between motor vehicles and towed vehicles Interchangeability. Licensed Copy: London South Bank University, London South Bank University, S
36、at Dec 09 02:07:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 6 blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:07:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 241:1991 BSI 02-2000 Publication(s) referred to See national foreword. Licensed Copy:
37、London South Bank University, London South Bank University, Sat Dec 09 02:07:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 241:1991 ISO 1726:1989 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British St
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