1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 1726-3:2010Road vehicles Mechanicalcouplings between tractors andsemi-trailersPart 3: Requirements for semi-trailer contactarea to fifth wheelBS ISO 1726-3:2010 BRITISH ST
2、ANDARDNational forewordThis British Standard is the UK implementation of ISO 1726-3:2010.The UK participation in its preparation was entrusted to TechnicalCommittee AUE/13, Commercial and public service vehicles.A list of organizations represented on this committee can beobtained on request to its s
3、ecretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 58734 4ICS 43.040.70Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was publ
4、ished under the authority of theStandards Policy and Strategy Committee on 30 September 2010.Amendments issued since publicationDate Text affectedBS ISO 1726-3:2010Reference numberISO 1726-3:2010(E)ISO 2010INTERNATIONAL STANDARD ISO1726-3First edition2010-08-15Road vehicles Mechanical couplings betw
5、een tractors and semi-trailers Part 3: Requirements for semi-trailer contact area to fifth wheel Vhicules routiers Liaisons mcaniques entre tracteurs et semi-remorques Partie 3: Exigences pour plateaux friction de semi-remorques BS ISO 1726-3:2010ISO 1726-3:2010(E) PDF disclaimer This PDF file may c
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10、of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2010 All rights reservedBS ISO 1726-3:2010ISO 1726-3:2010(E) ISO 2010 All rights reserved iiiForeword ISO (the
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13、cal standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member b
14、odies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to 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 a
15、ny or all such patent rights. ISO 1726-3 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 15, Interchangeability of components of commercial vehicles and buses. ISO 1726 consists of the following parts, under the general title Road vehicles Mechanical couplings between t
16、ractors and semi-trailers: Part 1: Interchangeability between tractors and semi-trailers for general cargo Part 2: Interchangeability between low-coupling tractors and high-volume semi-trailers Part 3: Requirements for semi-trailer contact area to fifth wheel BS ISO 1726-3:2010ISO 1726-3:2010(E) iv
17、ISO 2010 All rights reservedIntroduction The dimensional interchangeability of truck and trailer is specified in various standards and regulations. In order to be able to design the details and resistance of the coupling devices, the area for the introduction of forces and torques between fifth whee
18、l and kingpin and trailer also needs to be well defined. Since many fifth wheel coupling plates are designed with certain wear resistance and limited flexibility, stiffness needs to be taken into account when designing the mating area of the trailer, which generally is made of steel. The fact that d
19、amage can occur in this area, including broken coupling plates, emphasizes the necessity of this part of ISO 1726. BS ISO 1726-3:2010INTERNATIONAL STANDARD ISO 1726-3:2010(E) ISO 2010 All rights reserved 1Road vehicles Mechanical couplings between tractors and semi-trailers Part 3: Requirements for
20、semi-trailer contact area to fifth wheel 1 Scope This part of ISO 1726 specifies the test conditions of a static test to be performed on the semi-trailer contact area to the fifth wheel. It ensures the ability of the semi-trailer to couple the greatest possible variety of tractor vehicles equipped w
21、ith a fifth wheel coupling in accordance with ISO 3842. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 contact area to the fifth wheel circular zone surrounding and centred on the kingpin and having a diameter of 965 mm 2.2 test force Fvmaxi
22、mum vertical static load the semi-trailer manufacturer allows to be transmitted to a fifth wheel 3 Requirements During the static test described in 4.2, the elastic deformation, S, shall not exceed 5 mm vertical deflection at any point of the contact area to the fifth wheel during the application of
23、 the test force (see Figure 1). After unloading/discharging, the total unevenness shall not exceed 2 mm at any point within this zone (see Figure 4). 4 Test methods 4.1 General The verification of the minimum requirements specified in this part of ISO 1726 can be performed by static tests (see 4.2)
24、or adequate calculation, if the deformation is only elastic (see 4.3). In the case of a static test, the test forces, Fv/2, shall be positioned at dimensions X (see Figure 1), and may be either applied in one point or uniformly distributed in accordance with the semi-trailer manufacturers recommenda
25、tion. BS ISO 1726-3:2010ISO 1726-3:2010(E) 2 ISO 2010 All rights reserved4.2 Test with static vertical force 4.2.1 Test arrangement The test shall be performed on a whole semi-trailer or on a representative vehicle section. In any case, the fixing arrangements shall be representative and in accordan
26、ce with the kingpin manufacturers fitting instructions. 4.2.2 Preliminary verification Neither protrusions nor sharp edges are allowed in the contact area to the fifth wheel. Holes with sharp edges and holes exceeding a maximum diameter of 50 mm are not allowed. 4.2.3 Test procedure The test semi-tr
27、ailer or the representative vehicle section shall be laden with the maximum admissible static load as declared by the vehicle manufacturer. Examples of load application are given in Figures 1 and 2. The section shall be supported by a ring having an internal diameter of 220 mm and external diameter
28、in the range of 280 mm to 300 mm, as shown in Figure 3. 4.3 Alternative method In case of calculation, a preliminary verification shall be performed in accordance with 4.2.2 in order to ensure that the maximum existing unevenness of the contact area, semi-trailer unladen, is 2 mm at any point of the
29、 contact area to the fifth wheel (see Figure 4). The calculation method or the mathematical model shall be validated in comparison with the actual test procedure. Comparability of the results of the calculation (or the model) with results of conventional test procedures shall be proven. BS ISO 1726-
30、3:2010ISO 1726-3:2010(E) ISO 2010 All rights reserved 3Dimensions in millimetres Key 1 supporting ring for test B semi-trailer width Fvtest force X dimension Smaxmaximum elastic deformation Figure 1 Examples of application of vertical load, front view Dimensions in millimetres Key r1= 1 r2= 7 Figure
31、 2 Example of application of vertical load, side view BS ISO 1726-3:2010ISO 1726-3:2010(E) 4 ISO 2010 All rights reservedDimensions in millimetres Figure 3 Static test supporting ring Dimensions in millimetres Figure 4 Examples for the method to measure the total unevenness (unladen case) BS ISO 172
32、6-3:2010ISO 1726-3:2010(E) ISO 2010 All rights reserved 5Bibliography 1 ISO 3842, Road vehicles Fifth wheels Interchangeability 2 ISO 8716, Road vehicles Fifth wheel kingpins Strength test 3 ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories BS ISO 1726-3:
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