1、BRITISH STANDARDBS ISO 21244:2008Agricultural equipment Mechanical connections between towed and towing vehicles Implement hitch rings and attachment to tractor drawbarsICS 65.060.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g
2、36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS ISO 21244:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2008 BSI 2008ISBN 978 0 580 57186 2National forewordThis British Standard is the UK imp
3、lementation of ISO 21244:2008.The UK participation in its preparation was entrusted to Technical Committee AGE/6, Agricultural tractors and forestry machinery.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to includ
4、e all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsReference numberISO 21244:2008(E)INTERNATIONAL STANDARD ISO21244
5、First edition2008-06-01Agricultural equipment Mechanical connections between towed and towing vehicles Implement hitch rings and attachment to tractor drawbars Matriel agricole Liaisons mcaniques entre vhicules tracteurs et vhicules tracts Attelages anneau pour instruments et fixation la barre datte
6、lage BS ISO 21244:2008ii 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 technical committees. Each member body intereste
7、d 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 with the International Electrotechnical Com
8、mission (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 committees is to prepare International Standards. Draft International Standards adopted by the techni
9、cal 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 document may be the subject of patent rights. ISO sh
10、all not be held responsible for identifying any or all such patent rights. ISO 21244 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and foresty, Subcommittee SC 4, Tractors. BS ISO 21244:2008blank1Agricultural equipment Mechanical connections between towed and
11、towing vehicles Implement hitch rings and attachment to tractor drawbars 1 Scope This International Standard specifies dimensional requirements for the hitch rings of agricultural trailers and trailed implements designed to be attached to agricultural tractor drawbars of clevis type according to ISO
12、 6489-3. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 6489-3:2004,
13、Agricultural vehicles Mechanical connections between towed and towing vehicles Part 3: Tractor drawbar 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 angle of yaw A rotation around a vertical axis of the vehicle passing through the coupling
14、point 3.2 angle of pitch B rotation around a horizontal axis passing through the coupling point and perpendicular to the longitudinal plane of symmetry of the vehicle 3.3 angle of roll C rotation around a horizontal axis passing through the coupling point and located in the plane of symmetry of the
15、vehicle BS ISO 21244:20082 4 Specifications 4.1 The hitch dimensions shall be in accordance with Figure 1 and Table 1, and Figure 2 and Table 2, and shall allow rotation as shown in Figure 3 and as specified in Table 3. 4.2 The dimensions relative to the standard specifications are divided into the
16、six categories based on tractor PTO power as defined in ISO 6489-3. NOTE For information on hitch combinations, see Annex A. 4.3 Draft loads, PTO power according to ISO 6489-3:2004, Table 1, and the maximum static vertical load requirements of the towed agricultural implement shall dictate the hitch
17、 category, and whether a hitch ring (see Figure 1) or ball ring hitch (see Figure 2) is to be used. A ball ring hitch may be used when a tighter connection between the tractor and implement is required. 4.4 The maximum static vertical load shall be determined in accordance with ISO 6489-3:2004, Tabl
18、e 5. 4.5 The hitch design shall be for connection to a clevis type drawbar only. BS ISO 21244:20083For use only with a drawbar clevis. NOTE For angle B, see Table 3. Figure 1 Hitch ring of implement (see Table 1) Table 1 Hitch ring specifications (see Figure 1) Dimensions in millimetres Drawbar cate
19、gory Parameter 0 1 2 3 4 5 Slot length, D 2140 3348 3360 4166 5570 7385 Slot width (min.), E 21 33 33 41 55 73 Thickness (max.), F 30 36 38 48 50 60 Distance (max.), G 55 85 95 95 110 140 Distance (min.), H 35 40 50 50 65 80 Radius, I 0,5F 0,5F 0,5F 0,5F 0,5F 0,5F Width (max.), J 95 107 115 140 160
20、190 Radius, M As required to provide adequate articulation between the tractor and the implement. Pin diameter (min.) In accordance with ISO 6489-3:2004, Table 4. BS ISO 21244:20084 For use only with a drawbar clevis. NOTE For angle B, see Table 3. For dimensions F, G and H, see Table 1. aIn all dir
21、ections. Figure 2 Ball hitch ring of implement (see Table 2) Table 2 Hitch ring specifications (see Figure 2) Dimensions in millimetres Drawbar category Parameter 0 1 2 3 4 5 Ball thickness (max.), K 45 65 65 85 85 95 Drawpin hole diameter, L, 0,80,25+19 31 31 39 51 71 Pin diameter (min.) In accorda
22、nce with ISO 6489-3:2004, Table 4. BS ISO 21244:20085Angle of yaw Angle of pitch Angle of roll Figure 3 Minimum angles of articulation of drawbar (see Table 3) Table 3 Angles of articulation (see Figure 3) Angles in degrees Drawbar category Parameter 0 1 2 3 4 5 Angle of yaw, A a90 90 90 90 90 90 An
23、gle of pitch, B 20 20 20 20 15 15 Angle of roll, C 20 20 20 20 15 15 aThe intent is to provide more clearance in the connection than is allowed by the tractor rear tires and implement hitch. BS ISO 21244:20086 Annex A (informative) Permissible mechanical connection combinations between towed and tow
24、ing vehicles See Table A.1. Table A.1 Permissible mechanical connection combinations Towing vehicle Towed vehicle ISO 6489-1:1991 hook type ISO 5692:1979/ISO 5692-1:2004 hitch ring (50 mm hole centre, 30 mm ring diameter) ISO 5692:1979/ISO 5692-1:2004 hitch ring (50 mm hole centre, 30 mm ring diamet
25、er) ISO 6489-1:2001 hook type aISO 20019:2001 hitch ring (50 mm hole centre, 30 mm to 41 mm ring diameter) ISO 5692-2:2002 coupling ring (40 mm socket) ISO 6489-2:2002 bolt type ISO 8755:1986 40 mm drawbar coupling bISO 5692:1979/ISO 5692-1:2004 hitch ring (50 mm hole centre, 30 mm ring diameter) IS
26、O 5692-2:2002 coupling ring (40 mm socket) ISO 8755:1986 40 mm drawbar coupling ISO 1102:1986 50 mm drawbar coupling cISO 6489-3:2004 drawbar (category 2) ISO 21244 implement hitch ring (category 2) ISO 6489-3:2004 drawbar (other categories) ISO 21244 implement hitch ring (other categories) ISO 6489
27、-4:2004 piton type ISO 5692:1979/ISO 5692-1:2004 hitch ring (50 mm hole centre, 30 mm ring diameter) ISO 24347:2005 ball type ISO 24347:2005 (80 mm ball diameter) Only the combinations given above are recommended. aConnecting an ISO 6489-1:2001 hook, manufactured in accordance with the maximum sizes
28、 permitted, to hitch-rings in accordance with ISO 5692-1 and of minimum dimensions (30 mm ring diameter) according to ISO 20019, could result in a “jerky” connection between the tractor and the trailer and result in less driving comfort. bPrimarily used on trailers towed behind trucks (on-road). cCo
29、uld result in a “jerky” connection between the tractor and the trailer and result in less driving comfort.BS ISO 21244:20087Bibliography 1 ISO 1102:1986, Commercial road vehicles Mechanical connections between towing vehicles and trailers 50 mm drawbar couplings 2 ISO 5692:1979, Agricultural vehicle
30、s Mechanical connections on towed vehicles Hitch-rings Specifications 3 ISO 5692-1:2004, Agricultural vehicles Mechanical connections on towed vehicles Part 1: Dimensions for hitch rings of 50/30 mm cross section 4 ISO 5692-2:2002, Agricultural vehicles Mechanical connections on towed vehicles Part
31、2: Coupling ring 40 with socket 5 ISO 6489-1:1991, Agricultural vehicles Mechanical connections on towing vehicles Part 1: Hook type 6 ISO 6489-1:2001, Agricultural vehicles Mechanical connections between towed and towing vehicles Part 1: Dimensions of hitch-hooks 7 ISO 6489-2:2002, Agricultural veh
32、icles Mechanical connections between towed and towing vehicles Part 2: Specifications for clevis coupling 40 8 ISO 6489-4:2004, Agricultural vehicles Mechanical connections between towed and towing vehicles Part 4: Dimensions of piton-type coupling 9 ISO 8755:1986, Commercial road vehicles Mechanica
33、l connections between towing vehicles and trailers 40 mm drawbar coupling 10 ISO 20019:2001, Agricultural vehicles Mechanical connections on towed vehicles Dimensions for hitch rings 11 ISO 24347:2005, Agricultural vehicles Mechanical connections between towed and towing vehicles Dimensions of ball-
34、type coupling device (80 mm) BS ISO 21244:2008BS ISO 21244:2008BSI Group Headquarters389 Chiswick High Road,London W4 4AL, UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996 Standards Institute (BSI)BSI is the independent national body responsible for preparing British Standards. It presents the UK view o
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