1、BRITISH STANDARD BS ISO 12368:2001 Agricultural vehicles Mechanical hook-type connections on towing vehicles Test methods and requirements ICS 65.060.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS ISO 12368:2001 This British Standard, having been prepared under the direc
2、tion of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 August 2001 BSI 08-2001 ISBN 0 580 37933 7 National foreword This British Standard reproduces verbatim ISO 12368:2001 and implements it as the UK national standard. The
3、UK participation 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 whi
4、ch implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does n
5、ot purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their 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 i
6、nternational/European committee any enquiries 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
7、ISO title page, pages ii and iii, a blank page, pages 1 to 7 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsReference number ISO 12368:2001(E) INTERNATIONAL STANDARD ISO 12368
8、First edition 2001-05-01 Agricultural vehicles Mechanical hook- type connections on towing vehicles Test methods and requirements Vhicules agricoles Liaisons mcaniques de type crochet sur vhicules tracteurs Mthodes dessai et exigencesISO 12368:2001(E) ii ISO 12368:2001(E)iii Foreword ISO (the Intern
9、ational 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 technical committees. Each member body interested in a subject for which a technical committee has b
10、een 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 with the International Electrotechnical Commission (IEC) on all matters of electrotechnical sta
11、ndardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. 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 l
12、east 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 12368 was pre
13、pared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee SC 2, Common tests.INTERNATIONAL STANDARD ISO 12368:2001(E)1 Agricultural vehicles Mechanical hook-type connections on towing vehicles Test methods and requirements 1 Scope This International St
14、andard specifies a dynamic test method for mechanical hook-type connections and hook coupling devices, as well as a static test of their keeper plates. It is applicable to hooks meeting the requirements of ISO 6489-1 used on towing vehicles with an unladen mass of up to 10 t. Towing vehicles with a
15、greater unladen mass are nevertheless treated as 10 t towing vehicles, especially with regard to their reference mass. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated re
16、ferences, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated
17、references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 6489-1, Agricultural vehicles Mechanical connections between towed vehicles and towing vehicles Part 1: Dimensions of hitch-hooks IS
18、O 20019: 1) , Agricultural vehicles Mechanical connections on towed vehicles Dimensions for hitch rings 89/173/EEC, Council of Europe Directive of 21 December 1988 on the approximation of the laws of the Member States relating to certain components and characteristics of wheeled agricultural or fore
19、stry tractors 3 Terms and definitions For the purposes of this International Standard, the following terms and definitions apply. 3.1 unladen mass mass of the unladen towing vehicle in working order with tanks and radiators full, including any protective structure, track equipment or additional fron
20、t-wheel-drive components required for normal use, but not including operator, optional ballast weights, additional wheel equipment, special equipment or loads 3.2 reference mass m R mass, not less than the unladen mass, selected by the manufacturer for calculation of the force to be used in the test
21、 1) To be published. (Revision of ISO 5692:1979)ISO 12368:2001(E) 2 3.3 hook coupling device hook, together with its keeper plate, locking mechanism and all load-carrying components needed for its installation o nat ow i n gv eh i clech a ssi s 3.4 keeper plate part that ensures that the hitch ring
22、cannot become detached from the hook See ISO 20019. 3.2 vertical static load S maximum permissible static load at the hook, as declared by the manufacturer, applied vertically to a hitch ring See ISO 20019. 4 Test equipment 4.1 Strength The test equipment and the means of ensuring that the hook coup
23、ling device is fixed firmly to the bedplate shall be such that they do not deflect significantly in relation to the hook coupling device under loading. 4.2 Load application 4.2.1 Hook coupling device The means of applying a force to the hook coupling device (see Figure 1) shall comply with the follo
24、wing requirements. a) The dynamic force application frequency shall not exceed 5 Hz unless it can be demonstrated that the natural frequency is not affecting the load pattern. b) The force shall be applied by means of a hitch ring whose maximum dimensions are in accordance with ISO 20019. c) The for
25、ce applied shall, during the whole test, be kept to within 2 % of the maximum force limits set as calculated. d) The loading direction shall, during the whole test, be kept to within 3 of the original set direction downwards and 1,5 from the set sideways inclination. 4.2.2 Keeper plate The means of
26、applying a force to the keeper plate (see Figure 2) and hook shall comply with the following requirements. a) The static force shall be applied by means of a hitch ring whose dimensions are in accordance with ISO 20019. b) The force applied shall be within 2 % of the calculated force, and the upward
27、 inclination within 3 .ISO 12368:2001(E)3 Key 1 Keeper plate 2 Hook 3R i n g Figure 1 Hook coupling device dynamic test load applicationISO 12368:2001(E) 4 Key 1 Keeper plate 2 Hook 3R i n g Figure 2 Keeper plate static test load application 5 Preparation of hook coupling device The hook coupling de
28、vice shall be to production specification and fitted on the test bed or towing vehicle chassis with all parts, and only those parts, needed for installation on a towing vehicle. The assembly shall be secured to the bedplate so that the members connecting the assembly and the bedplate do not deflect
29、significantly. The assembly shall not receive any support under loading other than that due to the initial attachment. 6 Test conditions The hook coupling device, in the locked position, shall be dynamically tested with a pulsating tensile force of the magnitude and direction specified in clauses 7
30、and 8. After completion of the dynamic test, the keeper plate shall be tested with a static tensile force according to clause 9. The tests shall be conducted at an ambient temperature of at least 10 C.ISO 12368:2001(E)5 7 Determination of test force and load direction 7.1 Test force The determinatio
31、n of the test force, F,i sv al idfo r towing vehicle/trailer assemblies whose combined total mass does not exceed 40 t, and a ratio between the unladen mass of the towing vehicle and the maximum laden mass of the towing vehicle equal to 1,5 (as adopted in 89/173/EEC, Annex IV). The test force, F, ex
32、pressed in newtons, is determined using the following equation: F =( F h 2 + F v 2 ) 1/2 where F h is a horizontal force, in newtons: F h =12 m R where m R is the reference mass in kilograms; NOTE This is a simplified version of the formula for the horizontal force, F h , found in 89/173/EEC. F v is
33、 a vertical force, in newtons: F v =15 S where S is the static vertical load, in kilograms (if a value is not available, use S =0, 6 m R ). When selecting the value S, the limitation on the vertical static load given in ISO 6489-1 shall be taken into account. 7.2 Load direction The downward angle of
34、 load direction, A, is defined as: v h tan F A F In addition, the load direction shall be inclined 5 to the side of the longitudinal plane. 8 Dynamic test of hook coupling device Load the hook coupling device with a pulsating tensile force, F,a cco rd in gtocl au se4 . Before the test, check that ho
35、ok coupling device conforms to the requirements given in clause 5; conduct the test under the conditions given in clause 6. Calculate the test force and load direction using the formulae given in 7.1 and 7.2. During the whole test, the force shall alternate between 0,05F and 1,0F. For steel componen
36、ts, test for 1 10 6 load cycles.ISO 12368:2001(E) 6 NOTE The endurance limit of steel fabricated and welded assemblies is generally agreed to be 2 10 6 load cycles. The verification of the strength of the hook coupling device after completing 1 10 6 load cycles is possible due to an acceleration fac
37、tor applied to the test load equal to 1,26 times the normally permissible stress for vehicle coupling devices. 9 Static test of hook and keeper plate The test force 0,5 F shall be applied upwards and rearwards at an angle of 45 to the horizontal and maintained for a period of 1 min using a hitch rin
38、g of the dimensions specified in ISO 20019, within the hook contact area. If the shape of the keeper plate is such that it is not possible to apply the load with a single ram at 45 ,t h el o a d may be applied with two rams, providing that the resultant loads are at 45 . NOTE By loading at 45 , a we
39、dging action will be created between keeper plate and hook, as well as loading the keeper plate. 10 Conditions of acceptance 10.1 Hook coupling device After completing the test, inspect the hook coupling device for cracks and tears. Perform this inspection using the colour penetration, or a similar,
40、 crack-indication method. If the hook coupling device breaks before the completion of the required number of load cycles, note the number reached, together with the reason the test was stopped. 10.2 Keeper plate and hook At no time during the test shall the distance, d, between the keeper plate and
41、the hook (see Figure 1), exceed 10 mm. 11 Extension to other towing-vehicle models In the case of a hook coupling device which complies with this International Standard and which is designed to be used on other towing-vehicle models, the tests specified in clauses 8 and 9 are not required to be carr
42、ied out for each model of towing vehicle, provided that a) the mass of the towing vehicle does not exceed the reference mass used in the test by more than 5 %, and b) the means of attachment and the components of the towing vehicle to which attachment is made are identical, or of equivalent strength
43、, to the ones tested. In such cases, the test report shall contain a reference to the previous report. 12 Labelling If a label is required it shall contain at least the following information: a) name and address of the manufacturer of the hook coupling device; b) hook coupling device identification
44、number; c) reference mass; d) static vertical load.ISO 12368:2001(E)7 The label shall be durable and permanently attached to the hook coupling device such that it can be read, and shall be located in such a way as to be reasonably well protected from damage. 13 Test report The test report shall cont
45、ain at least the following: a) name of manufacturer and identification number of the hook coupling device; b) reference to the product drawing or drawings of the hook coupling device and specification of the materials used for its components; c) make, model and series of each towing vehicle the hook
46、 coupling device is designed to fit; d) reference mass and static vertical load used for determining the test parameters; e) results of tests and observations.BS ISO 12368:2001 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible
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