ISO INTERNATIONAL STANDARD 8717 Second edition 2000-07-01 Commercial road vehicles Fifth wheel couplings Strength tests Véhicules routiers utilitaires Sellette d'attelage -Essais de résistance Reference number ISO 8717:2000(E) ISO @ ISO 2000 ISO 8717:2000(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. @ISO2000 ber body in the country 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 [email protected] Web www.iso.ch Printed in Switzerland ii @ ISO 2000 - All rights reserved ISO 8717:2000(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO mittees. Each member body interested in a subject for which a technical committee has been established has the son with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. patent rights. IsO shall not be held responsible for identifying any or all such patent rights. SC15,Interchangeabilityofcomponentsofcommercialvehiclesandbuses. This second edition cancels and replaces the first edition (iSO 8717:1988), which has been technically revised Annex A forms a normative part of this International Standard. @ ISO 2000 - All rights reserved ii ISO 8717:2000(E) INTERNATIONAL STANDARD Commercial road vehicles Fifth wheel couplings Strength tests 1 Scope This International Standard specifies the test conditions and strength requirements to be met by 50 and 90 fifth wheel couplings(seeIsO3842) 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publica tions do not apply. However, parties to agreements based on this International Standard are encouraged to investi- gate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. IsO 1176, Road vehicles—Masses— Vocabulary and codes. IsO 3842, Road vehicles Fifth wheels Interchangeability. 3 General test requirements specified in annex A. ing vehicle in accordance with the coupling manufacturer's fitting instructions 3.3 At the discretion of the manufacturer, any flexible components may be neutralized. 4 Determination of D-value ingvehicleandthesemi-trailer.D,expressedinkilonewtons,shallbecalculatedfromtheequation: 0,6 ×T× R D=g× T+R-U where T is the maximum design total mass, including U, of the towing vehicle which is to tow the semi-trailer, in tonnes; R is the maximum design total mass of the semi-trailer which is to be drawn with the fifth wheel, in tonnes; U is the mass imposed vertically on the fifth wheel coupling by the semi-trailer loaded to its maximum design total mass, in tonnes; @ ISO 2000 - All rights reserved 1 ISO 8717:2000(E) g is the acceleration due to gravity (= 9,81m/s2) Terminology for the different masses shall be taken with the meanings given in the corresponding definiti