1、BRITISH STANDARD BS ISO 6489-2:2002 Agricultural vehicles Mechanical connections between towed and towing vehicles Part 2: Specifications for clevis coupling 40 ICS 65.060.10 BS ISO 6489-2:2002 This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strat
2、egy Committee, was published under the authority of the Standards Policy and Strategy Committee on 12 November 2002 BSI 12 November 2002 ISBN 0 580 40716 0 National foreword This British Standard reproduces verbatim ISO 6489-2:2002 and implements it as the UK national standard. The UK participation
3、in its preparation was entrusted to Technical Committee AGE/6, Agricultural tractors and forestry machinery, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement inte
4、rnational publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to incl
5、ude all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enqui
6、ries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii and iii, a blank
7、 page, pages 1 to 6, an inside back cover and back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 6489-2:2002(E)INTERNATIONAL STANDARD ISO 6489-2 Second edition 2002
8、-07-01 Agricultural vehicles Mechanical connections between towed and towing vehicles Part 2: Specifications for clevis coupling 40 Vhicules agricoles Liaisons mcaniques entre vhicules remorqueurs et vhicules remorqus Partie 2: Spcifications relatives aux attelages de type chape de 40 BSISO64892:200
9、2BSISO64892:2002iiIS-9846 O2:(2002)E I SO 2002 All irthgs ersedevr iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO techni
10、cal 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 ISO, also take part in the work. ISO collaborates closely w
11、ith 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 3. The main task of technical committees is to prepare International Standards. Draft Int
12、ernational 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 the possibility that some of the elements of this part of IS
13、O 6489 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 6489-2 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee SC 4, Tractors. This second edition cancels and rep
14、laces the first edition (ISO 6489-2:1980), which has been technically revised. ISO 6489 consists of the following parts, under the general title Agricultural vehicles Mechanical connections between towed and towing vehicles: Part 1: Dimensions of hitch-hooks Part 2: Specifications for clevis couplin
15、g 40 Part 3: Tractor drawbar Part 4: Dimensions of piton-type coupling BSISO64892:2002iiiINTENRATIONAL TSANDADR IS-9846 O2:(2002)EI SO 2002 All irthgs ersedevr 1Agricultural vehicles Mechanical connections between towed and towing vehicles Part 2: Specifications for clevis coupling 40 1 Scope This p
16、art of ISO 6489 gives specifications for the clevis couplings used in the attachment to agricultural towing vehicles of towed, non-balanced trailers and implements equipped with a coupling ring 40 as specified in ISO 5692-2 and ISO 8755. The mounting of one of the three trailer coupling shapes, A, B
17、 or C, on an agricultural vehicle or trailer is at the manufacturers or users discretion. The full interchangeability of the three shapes is provided for. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this
18、part of ISO 6489. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO 6489 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indic
19、ated 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 286-1, ISO system of limits and fits Part 1: Bases of tolerances, deviations and fits ISO 2768-1:1989, Gener
20、al tolerances Part 1: Tolerances for linear and angular dimensions without individual tolerance indications ISO 5692-2, Agricultural vehicles Mechanical connections on towed vehicles Part 2: Coupling ring 40 with socket ISO 8755, Commercial road vehicles 40 mm drawbar eye Interchangeability 3 Term a
21、nd definition For the purposes of this part of ISO 6489, the following term and definition apply. 3.1 D value mathematically established representative force for the horizontal component of the force acting on the trailer coupling in the longitudinal axis of the vehicle BSISO64892:20021IS-9846 O2:(2
22、002)E 2 I SO 2002 All irthgs ersedevr 4 Dimensions Any specification not given in this part of ISO 6489 shall be chosen appropriately. Tolerances on dimensions without individual tolerance indications shall be in accordance with ISO 2768-1:1989, tolerance class c. Limits and fits shall be in accorda
23、nce with ISO 286-1. The dimensions of trailer couplings of shapes A, B and C shall be as shown in Figures 1, 2 and 3, respectively. Dimensions in millimetres aThe clevis height shall be greater than half the clevis width. bThe values of the angles of articulation shall be obtained together with the
24、coupling rings used. Figure 1 Non-automatic trailer coupling with cylindrical pin Shape A BSISO64892:20022IS-9846 O2:(2002)E I SO 2002 All irthgs ersedevr 3Dimensions in millimetres aExample for design bReady for coupling cCoupled dThe opening shall be designed so that no dust can collect inside. eH
25、and lever, optionally at left fThe clevis height shall be greater than half the clevis width. gThe values of the angles of articulation shall be obtained together with the coupling rings used. Figure 2 Automatic trailer coupling with cylindrical pin Shape B BSISO64892:20023IS-9846 O2:(2002)E 4 I SO
26、2002 All irthgs ersedevr Dimensions in millimetres aExample for design bReady for coupling cCoupled dThe opening shall be designed so that no dust can collect inside. eHand lever, optionally at left fThe clevis height shall be at least greater than half the clevis width. gThe values of the angles of
27、 articulation shall be obtained together with the coupling rings used. hThe lower tolerance up to 2 is permissible only when the bolt diameter () 0 7 38 mm is reduced by twice the real tolerance: i.e. (51 1) mm = 50 mm, 38 (2 1) mm = 36 mm, (51 2) mm = 49 mm, 38 (2 2) mm = 34 mm. Figure 3 Automatic
28、trailer coupling with crowned pin Shape C BSISO64892:20024IS-9846 O2:(2002)E I SO 2002 All irthgs ersedevr 55 Calculation of value D The D value, in kilonewtons, is calculated using the following equation, where the values of R and T are known: TR Dg TR = +where g = 9,81 m/s 2 ; R is the admissible
29、towed mass of the towed vehicle, in tonnes; T is the admissible total mass of the motor vehicle, in tonnes. 6 Location The location of the pin coupling shall be as shown in Figure 4. For height-adjustable couplings, it shall be possible to realize a positioning in accordance with the value h (see Ta
30、ble 1). The value of h shall be in accordance with Table 1. Key 1 Pin coupling 2 Road surface Figure 4 Location Table 1 Location Value of h Agricultural vehicle engine power kW h mm u 55 825 75 55 100 80 900 + BSISO64892:20025IS-9846 O2:(2002)E 6 I SO 2002 All irthgs ersedevr 7 Requirements 7.1 Vert
31、ical static download The maximum allowable vertical static download force shall be equivalent to a mass of 2 000 kg. 7.2 D value Trailer coupling shape A shall be designed for D u 90 kN; trailer coupling shapes B and C shall be designed for D u 120 kN. 7.3 Closed position Shapes B and C For shapes B
32、 and C after coupling, the closed and secured position of the coupling to the outside shall be indicated clearly and obviously. 8 Marking The identification block indicating conformance with this part of ISO 6489, the type designation and the manufacturers trade mark shall be attached to the couplin
33、g in a durable way. It shall be located on the coupling so that it is legible and can be read easily, for example, on the name plate. 9 Designation EXAMPLE Designation of a non-automatic trailer coupling (shape A) and cylindrical-bolt trailer coupling: Bolt coupling ISO 6489-2-A BSISO64892:20026BS I
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