1、 ASABE/ISO 21244:2008 JAN2011 (R2016) Agricultural equipment Mechanical connections between towed and towing vehicles Implement hitch rings and attachment to tractor drawbars American Society of Agricultural and Biological Engineers ASABE is a professional and technical organization, of members worl
2、dwide, who are dedicated to advancement of engineering applicable to agricultural, food, and biological systems. ASABE Standards are consensus documents developed and adopted by the American Society of Agricultural and Biological Engineers to meet standardization needs within the scope of the Societ
3、y; principally agricultural field equipment, farmstead equipment, structures, soil and water resource management, turf and landscape equipment, forest engineering, food and process engineering, electric power applications, plant and animal environment, and waste management. NOTE: ASABE Standards, En
4、gineering Practices, and Data are informational and advisory only. Their use by anyone engaged in industry or trade is entirely voluntary. The ASABE assumes no responsibility for results attributable to the application of ASABE Standards, Engineering Practices, and Data. Conformity does not ensure c
5、ompliance with applicable ordinances, laws and regulations. Prospective users are responsible for protecting themselves against liability for infringement of patents. ASABE Standards, Engineering Practices, and Data initially approved prior to the society name change in July of 2005 are designated a
6、s “ASAE”, regardless of the revision approval date. Newly developed Standards, Engineering Practices and Data approved after July of 2005 are designated as “ASABE”. Standards designated as “ANSI” are American National Standards as are all ISO adoptions published by ASABE. Adoption as an American Nat
7、ional Standard requires verification by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by ASABE. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and material
8、ly affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made toward their resolution. CAUTION NOTICE: ASABE and ANSI standards may be revised or
9、withdrawn at any time. Additionally, procedures of ASABE require that action be taken periodically to reaffirm, revise, or withdraw each standard. Copyright American Society of Agricultural and Biological Engineers. All rights reserved. ASABE, 2950 Niles Road, St. Joseph, Ml 49085-9659, USA, phone 2
10、69-429-0300, fax 269-429-3852, hqasabe.org S T A N D A R D ASABE/ISO 21244:2008 JAN2011 (R2016) Copyright American Society of Agricultural and Biological Engineers 1 ASABE/ISO 21244:2008 JAN2011 (R2016) Approved January 2011; reaffirmed January 2016 as an American National Standard Agricultural equi
11、pment Mechanical connections between towed and towing vehicles Implement hitch rings and attachment to tractor drawbars These materials are subject to copyright claims of ISO and ASABE. No part of this publication may be reproduced in any form, including an electronic retrieval system, without the p
12、rior written permission of ASABE. All requests pertaining to the ASABE/ISO 21244:2008 JAN2011 (R2016) standard should be submitted to ASABE. This standard was reviewed for adoption by the ASABE Power and Machinery Agricultural Machinery - Agricultural Tractor Technical subcommittee, and has been for
13、merly approved by the Technical Committee. Adopted by ASABE and approved as an American National Standard January 2011; reaffirmed January 2016. Keywords: Dimensions, Implement attachment, Mechanical connections, Tractor 0 Foreword 0.1 ASABE/ISO 21244:2008, Agricultural equipment Mechanical connecti
14、ons between towed and towing vehicles Implement hitch rings and attachment to tractor drawbars, is an adoption without modification of the identically titled ISO standard ISO 21244:2008(E), Mechanical connections between towed and towing vehicles Implement hitch rings and attachment to tractor drawb
15、ars 0.2 ASABE/ISO 21244:2008 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 6489-3. Note that ISO 6489-3 has been nationally adopted as ANSI/ ASABE AD6489-
16、3:2004 (JUN2009). 0.3 One normative reference is listed in ISO 21244:2008(E). This reference has been reviewed and accepted as part of the adoption of ASABE/ISO 21244:2008. 0.4 This standard has been approved as an American National Standard by ANSI (American National Standards Institute). Text of I
17、SO 21244:2008, Agricultural equipment Mechanical connections between towed and towing vehicles Implement hitch rings and attachment to tractor drawbars, follows. 1 Scope This International Standard specifies dimensional requirements for the hitch rings of agricultural trailers and trailed implements
18、 designed to be attached to agricultural tractor drawbars of clevis type according to ISO 6489-3. ASABE/ISO 21244:2008 JAN2011 (R2016) Copyright American Society of Agricultural and Biological Engineers 2 2 Normative references The following referenced documents are indispensable for the application
19、 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, Agricultural vehicles Mechanical connections between towed and towing vehicles Part 3: Tractor drawbar 3
20、 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 point 3.2 angle of pitch B rotation around a horizontal axis passing through the coupling point and perp
21、endicular 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 vehicle 4 Specifications 4.1 The hitch dimensions shall be in accordance with Figure 1 and Table 1, and
22、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 six categories based on tractor PTO power as defined in ISO 6489-3. NOTE: For information on hitch combinations, see Annex
23、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 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
24、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, Table 5. 4.5 The hitch design shall be for connection to a clevis type drawbar only. ASABE/ISO 21244:2008 JAN2011 (R2016) Copy
25、right American Society of Agricultural and Biological Engineers 3 For 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 Parameter Drawbar Category 0 1 2 3 4 5 Slot
26、length, D 21-40 33-48 33-60 41-66 55-70 73-85 Slot width (min.), E 21 33 33 41 55 73Thickness (max.), F 30 36 38 48 50 60 Distance (max.), G 55 85 95 95 110 140Distance (min.), H 35 40 50 50 65 80 Radius, I 0,5F 0,5F 0,5F 0,5F 0,5F 0,5FWidth (max.), J 95 107 115 140 160 190 Radius, M As required to
27、provide adequate articulation between the tractor and the implement. Pin diameter (min.) In accordance with ISO 6489-3:2004, Table 4. ASABE/ISO 21244:2008 JAN2011 (R2016) Copyright American Society of Agricultural and Biological Engineers 4 For use only with a drawbar clevis. NOTE: For angle B, see
28、Table 3. For dimensions F, G and H, see Table 1. aIn all directions. Figure 2 Ball hitch ring of implement (see Table 2) Table 2 Hitch ring specifications (see Figure 2) Dimensions in millimetres Parameter Drawbar Category 0 1 2 3 4 5 Ball thickness (max.), K 45 65 65 85 85 95 Drawpin hole diameter,
29、 L,8,025,0+19 31 31 39 51 71 Pin diameter (min.) In accordance with ISO 6489-3:2004, Table 4. ASABE/ISO 21244:2008 JAN2011 (R2016) Copyright American Society of Agricultural and Biological Engineers 5 Figure 3 Minimum angles of articulation of drawbar (see Table 3) Table 3 Angles of articulation (se
30、e Figure 3) Angle in degrees Parameter Drawbar Category 0 1 2 3 4 5 Angle of yaw, Aa 90 90 90 90 90 90 Angle of pitch, B 20 20 20 20 15 15Angle of roll, C 20 20 20 20 15 15 a The intent is to provide more clearance in the connection than is allowed by the tractor rear tires and implement hitch. ASAB
31、E/ISO 21244:2008 JAN2011 (R2016) Copyright American Society of Agricultural and Biological Engineers 6 Annex A (informative) Permissible mechanical connection combinations between towed and towing vehicles See Table A.1. Table A.1 Permissible mechanical connection combinations Towing Vehicle Towed V
32、ehicle ISO 6489-1:1991 hook type ISO 5692:1979/ISO 5692-1:2004 hitch ring (50 mm hole centre, 30 mm ring diameter) ISO 6489-1:2001 hook typea ISO 5692:1979/ISO 5692-1:2004 hitch ring (50 mm hole centre, 30 mm ring diameter) ISO 20019:2001 hitch ring (50 mm hole centre, 30 mm to 41 mm ring diameter)
33、ISO 6489-2:2002 bolt type ISO 5692-2:2002 coupling ring (40 mm socket) ISO 8755:1986 40 mm drawbar coupling bISO 6489-3:2004 drawbar (category 2) ISO 5692:1979/ISO 5692-1:2004 hitch ring (50 mm hole centre, 30 mm ring diameter) ISO 5692-2:2002 coupling ring (40 mm socket) ISO 8755:1986 40 mm drawbar
34、 coupling ISO 1102:1986 50 mm drawbar coupling cISO 21244 implement hitch ring (category 2) ISO 6489-3:2004 drawbar (other categories) ISO 21244 implement hitch ring (other categories) ISO 6489-4:2004 piton type ISO 5692:1979/ISO 5692-1:2004 hitch ring (50 mm hole centre, 30 mm ring diameter) ISO 24
35、347:2005 ball type ISO 24347:2005 (80 mm ball diameter) Only the combinations given above are recommended. a Connecting an ISO 6489-1:2001 hook, manufactured in accordance with the maximum sizes permitted, to hitch-rings in accordance with ISO 5692-1 and of minimum dimensions (30 mm ring diameter) a
36、ccording to ISO 20019, could result in a “jerky” connection between the tractor and the trailer and result in less driving comfort. b Primarily used on trailers towed behind trucks (on-road). c Could result in a “jerky” connection between the tractor and the trailer and result in less driving comfor
37、t. ASABE/ISO 21244:2008 JAN2011 (R2016) Copyright American Society of Agricultural and Biological Engineers 7 Bibliography 1 ISO 1102:1986, Commercial road vehicles Mechanical connections between towing vehicles and trailers 50 mm drawbar couplings 2 ISO 5692:1979, Agricultural vehicles Mechanical c
38、onnections 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 2: Coupling ri
39、ng 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 vehicles Mechanic
40、al 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 Mechanical connections
41、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-type coupling device (80 mm)
