1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58semi-trailers Part 2: Interchangeability between low-coupling tractors and high-volume semi-trailer
2、sICS 43.040.70Road vehicles Mechanical couplings between tractors and BRITISH STANDARDBS ISO 1726-2:2007BS ISO 1726-2:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2007 BSI 2007ISBN 978 0 580 55436 0Amendments issued since pu
3、blicationAmd. No. Date Comments(approximately 1 in 14). A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compl
4、iance with a British Standard cannot confer immunity from legal obligations. National forewordThis British Standard is the UK implementation of ISO 1726-2:2007. The UK participation in its preparation was entrusted to Technical Committee AUE/13, Commercial and public service vehicles. UK Technical C
5、ommittee AUE/13 advises users of this International Standard that it may not be compatible with all operational circumstances in the United Kingdom, especially in respect of clearances of spray-suppression equipment and of relative inclinations between road surfaces that exceed 4 degrees Reference n
6、umberISO 1726-2:2007(E)INTERNATIONAL STANDARD ISO1726-2First edition2007-04-15Road vehicles Mechanical couplings between tractors and semi-trailers Part 2: Interchangeability between low-coupling tractors and high-volume semi-trailers Vhicules routiers Liaisons mcaniques entre tracteurs et semi-remo
7、rques Partie 2: Interchangeabilit entre tracteurs avec accouplement bas et semi-remorques de grand volume BS ISO 1726-2:2007ii iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Intern
8、ational Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with
9、 ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical
10、 committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to
11、the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 1726-2 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 15, Interchangeability of componen
12、ts of commercial vehicles and buses. ISO 1726 consists of the following parts, under the general title Road vehicles Mechanical couplings between tractors and semi-trailers: Part 1: Interchangeability between tractors and semi-trailers for general cargo1) Part 2: Interchangeability between low-coupl
13、ing tractors and high-volume semi-trailers 1) Revision of ISO 1726:2000. BS ISO 1726-2:2007blank1Road vehicles Mechanical couplings between tractors and semi-trailers Part 2: Interchangeability between low-coupling tractors and high-volume semi-trailers 1 Scope This part of ISO 1726 specifies dimens
14、ions to ensure interchangeability between a low coupling height tractor vehicle and a coupled high-volume semi-trailer, the two together constituting a high-volume articulated vehicle. It specifies certain interchangeability dimensions, including those of the optimised gooseneck contour, as well as
15、operating dimensions related to angle values. The specifications are primarily intended to permit semi-trailers to be coupled with two-axle tractors. However, three-axle tractors are not excluded, provided they are in compliance with the requirements of this part of ISO 1726. This part of ISO 1726 d
16、oes not provide limitations of maximum gross mass and overall dimensions, which are generally laid down by legislative requirements. 2 Interchangeability dimensions 2.1 Height of fifth wheel of a laden tractor The height, h, of the fifth wheel of a laden low-coupling tractor above ground (see Figure
17、 1) shall be in the range 900 mm to 975 mm. Key h height of fifth wheel Figure 1 Height of fifth wheel BS ISO 1726-2:20072 2.2 Height of fifth wheel of an uncoupled tractor The height, h, of the fifth wheel of an uncoupled low-coupling tractor shall not exceed 1 000 mm. 2.3 Forward clearance zone ra
18、dius of a semi-trailer The front end of the semi-trailer (see Figure 2) shall not exceed the radius, r1, of 2 040 mm. Dimensions in millimetres Key L4distance between two cylinders of revolution see 3.4 a) L5distance between surface of cylinder of revolution and conical surface of revolution see 3.4
19、 b) r1forward clearance zone radius of semi-trailer (see 2.3) r3radius between axis of coupling pin and lower part of the semi-trailer gooseneck see 2.4 d) 1angle of inclination towards the front 2angle of inclination towards the rear angle of articulation Figure 2 Free space between tractor and sem
20、i-trailer BS ISO 1726-2:200732.4 Gooseneck contour The gooseneck shall be located on the outside of a surface consisting of different planes and one surface of revolution specified below, which are interconnected one to the next without forming a step, as shown in Figures 3 a) and 3 b). These parts
21、of the total surface are defined as follows: a) a first plane, AB, horizontal and perpendicular to the axis of the coupling pin (kingpin) with a length of L1and a width the same as the semi-trailer, limited by the intersection of a second plane, described in b); b) a second plane, BC, with a width t
22、he same as the semi-trailer, making an angle 1with the first plane, limited by the intersection of a third plane, described in c); c) a third plane, CD, with a width the same as the semi-trailer, making an angle 2with the first plane, limited by the intersection of a surface of revolution, described
23、 in d); d) a surface of revolution, generated by rotating the vertical portion, EF, situated at a radius r3from the axis of the coupling pin (kingpin), and an arc of a circle of radius r2(DE) between the third plane and the vertical portion, EF, such that no discontinuity arises; e) a fourth plane,
24、AU, situated towards the front end of the semi-trailer, horizontal and perpendicular to the axis of the coupling pin (kingpin), with a length L3and a width the same as the semi-trailer, limited by the intersection of an inclined plane, UV, making an angle with the horizontal; the extremity of the fr
25、ont end (V) shall not protrude beyond a surface of revolution generated by a vertical plane at radius r1= 2 040 mm from the axis of the coupling pin (kingpin). The values adopted for these elements of the generator are as follows: length of first plane, L1= 500 mm length of first and second planes c
26、ombined, L2= 1 350 mm length of fourth plane, L3= 1 800 mm radius of arc between third plane and vertical portion, r2= 450 mm radius between axis of coupling pin (kingpin) and vertical portion, r3= 2 100 mm angle between second plane and first plane, 1= 1 angle between third plane and first plane, 2
27、= 7 angle between inclined plane and the horizontal, W 3,5 The centre of the circle of radius r2is determined on the basis of these dimensions. BS ISO 1726-2:20074 Dimensions in millimetres a) Generator elements b) 3-dimensional view Key L1length of first plane (AB) L2length of first and second plan
28、es combined (AB and BC) L3length of fourth plane (AU) r1radius of cylinder of revolution at the front end = 2 040 r2radius of arc (DE) r3radius between coupling pin (kingpin) axis and vertical portion (EF) angle between inclined plane (UV) and the horizontal 1angle between second plane (BC) and firs
29、t plane (AB) 2angle between third plane (CD) and first plane (AB) Figure 3 Optimized gooseneck contour BS ISO 1726-2:200753 Operating dimensions 3.1 Angles of inclination of the semi-trailer in relation to the tractor The tractor shall be so constructed that the tractor and the semi-trailer componen
30、ts, except for those concerned with articulation, do not make contact with each other when the articulated vehicle is running in a straight line, when the angle of inclination of the semi-trailer relative to the tractor does not exceed the values shown below (see Figure 2): angle of inclination towa
31、rds the front, 1u 3,5; angle of inclination towards the rear, 2u 4,5. For the purposes of the measurement of 1and 2, the fifth wheel plate is assumed to be situated in a horizontal plane. The tractor shall be set at the attitude which corresponds to the design laden condition when the tractor is sta
32、nding on a horizontal plane. 3.2 Lateral inclination When the semi-trailer is at a lateral inclination, , of a maximum of 2 relative to the tractor chassis (see Figure 4), there shall be no contact between the tractor chassis and the semi-trailer. Key lateral inclination Figure 4 Lateral inclination
33、 BS ISO 1726-2:20076 3.3 Angle of articulation The angle of articulation, , is the projection of the angle between the longitudinal axes of the tractor and semi-trailer in the horizontal plane (see Figure 2). The articulation of the vehicle shall be such that no contact is made between the semi-trai
34、ler and the tyres or spray suppression equipment of the tractor, taking into account that 2u 4,5 for all angles of u 25. Under manoeuvring conditions, the angle of articulation, , shall be able to reach 90 and the maximum angle of inclination, 2, may vary from 4,5 to 3 as varies from 25 to 90. 3.4 F
35、ree space between the tractor and the semi-trailer The free space between the tractor and semi-trailer is measured as follows (see Figure 2). a) L4is the distance between two cylinders of revolution, both having the kingpin (coupling pin) axis as their axis. One of these cylinders has radius r3(lowe
36、r part of the gooseneck) and the other is the cylinder of smallest radius within which all points of the rear part of the tractor are located. L4W 100 mm. b) L5is the clearance between the surface of the cylinder of revolution, whose axis is the axis of the fifth wheel coupling and whose radius, r1,
37、 is 2 040 mm, and a conical surface of revolution which has the same axis. This conical surface is generated by a line making an angle of 4 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 80 mm abo
38、ve the fifth wheel coupling face. At this point, L5W 80 mm. 4 Designation Low-coupling tractors and high-volume semi-trailers in compliance with the requirements of this part of ISO 1726 shall be designated as follows: Tractor ISO 1726 - L Semi-trailer ISO 1726 - L where L means “low coupling height
39、”. BS ISO 1726-2:20077Bibliography 1 ISO 337, Road vehicles 50 semi-trailer fifth wheel coupling pin Basic and mounting/interchangeability dimensions BS ISO 1726-2:2007BS ISO BSI389 Chiswick High RoadLondonW4 4AL1726-2:2007BSI British Standards InstitutionBSI is the independent national body respons
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