1、 ANSI/ASABE S625 MAR2015 Drawbar Pin Dimensions and Requirements for Towed Equipment American Society of Agricultural and Biological Engineers ASABE is a professional and technical organization, of members worldwide, who are dedicated to advancement of engineering applicable to agricultural, food, a
2、nd 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 Society; principally agricultural field equipment, farmstead equipment, structures, soil and wat
3、er 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, Engineering Practices, and Data are informational and advisory only. Their use by anyone eng
4、aged 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 compliance with applicable ordinances, laws and regulations. Prospective users are responsi
5、ble 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 as “ASAE“, regardless of the revision approval date. Newly developed Standards, Engineering
6、 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 National Standard requires verification by ANSI that the requirements for due process, consen
7、sus, 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 materially affected interests. Substantial agreement means much more than a simple majority, but n
8、ot 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 CAUTION NOTICE: ASABE and ANSI standards may be revised or withdrawn at any time. Additionally, procedures of ASABE require that action be taken peri
9、odically 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 269-429-0300, fax 269-429-3852, hqasabe.org ANSI/ASABE S625 MAR2015 Copyright American Soci
10、ety of Agricultural and Biological Engineers 1 ANSI/ASABE S625 MAR2015 Approved March 2015 as an American National Standard Drawbar Pin Dimensions and Requirements for Towed Equipment Developed by the ASABE Tractor Implement Interface/PTO committee. Approved as an ASABE standard March 2015; approved
11、 by ANSI March 2015. Keywords: Drawbar pin, Hitch pin, Pin strength, Towed equipment, Towing hitch 1 Purpose and Scope This standard establishes the dimensional and minimum strength requirements for agricultural drawbar hitch pins used in the single point attaching of a towed machine to towing machi
12、nes or leading machines. Application of this standard assumes that there is a clevis on the towing machine conforming to ANSI/ASABE AD 6489-3:2004 and a ring on the towed machine conforming to ASABE/ISO 21244:2008. Additionally, this standard defines loading conditions for drawbar pin retention syst
13、ems. When the towing machine does not conform to ANSI/ASABE AD 6489-3:2004 and/or the towed machine does not conform to ASABE/ISO 21244:2008, fit and performance of pins designed per this standard may be affected. However, usage of applicable specifications derived from this standard is encouraged f
14、or such cases. Note: ANSI/ASABE AD6489-3:2004 and ASABE/ISO 21244:2008 provide essential information related to tractor drawbars and associated implement hitch rings. 2 Normative References The following referenced documents are indispensable for the application of this document. For dated reference
15、s, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ANSI/ASABE AD6489-3:2004 Agricultural vehicles Mechanical connections between towed and towing vehicles Part 3: Tractor drawbar ASABE/ISO 21244:2008 Agricultur
16、al equipment Mechanical connections between towed and towing vehicles Implement hitch rings and attachment to tractor drawbars. 3 Terms and Definitions 3.1 drawbar pin: cylindrical component by which the motive and controlling forces are transferred from the towing machine to the towed machine under
17、 normal operating conditions 3.2 drawbar pin keeper: a mechanical means by which the drawbar pin is vertically retained and prevents the drawbar pin from being inadvertently dislodged due to upward loading from the towed machine during normal operations ANSI/ASABE S625 MAR2015 Copyright American Soc
18、iety of Agricultural and Biological Engineers 2 3.3 drawbar pin keeper secondary latch: a mechanical means, independent of the drawbar pin keeper that prevents the drawbar pin keeper from being inadvertently dislodged due to upward loading from the towed machine or passing crop 3.4 drawbar pin secon
19、dary keeper: a lynch pin or similar device, independent of the drawbar pin keeper, placed through a cross drilled hole near the bottom of the drawbar pin to prevent the drawbar pin from being inadvertently dislodged due to upward loading from the towed machine, if the drawbar pin keeper fails Note:
20、Some Original Equipment Manufacturers may have a need to minimize the amount that the drawbar pin extends below the Drawbar to reduce a raking effect, crop damage or crop entanglement. In this case the drawbar pin secondary keeper may be at another location. 3.5 towing machine: any tractor or self-p
21、ropelled vehicle providing the forces to move and control a unit of agricultural field equipment 3.6 towed machine: any unit of agricultural field equipment that receives the forces for movement and control from a towing machine Note: in trains of multiple units of agricultural field equipment, a un
22、it of agricultural field equipment may be both a towing and a towed machine. See Figure 4. 3.7 towed machine hitch: mechanical connection by which the motive and controlling forces are transferred from the towing or leading machine to the towed machine 3.8 leading machine: any unit of agriculture fi
23、eld equipment that furnishes the forces necessary to move and control another towed machine 3.9 clevis: mechanical device combined with a drawbar to form a U shaped structure with holes in both the top and bottom of the structure allowing a pin to be passed through the holes in to connect two machin
24、es 4 Requirements 4.1 Drawbar pin 4.1.1 Shall be designed according to Figure 1 and with the dimensions in Table 1. 4.1.2 Shall be designed with a head or similar means to resist the downward forces experienced during normal transport and field operations 4.1.3 Shall be designed with a cross drilled
25、 hole or similar feature near the bottom for the use of a drawbar pin secondary keeper. 4.1.4 Shall have adequate strength to resist both the impact loading and longitudinal loading. See Section 5. 4.1.5 Shall be permanently marked with identification on the head of the pin, as shown in Figure 1, in
26、 the following format; “ANSI/ASABE S625, Cat _”. The size of the lettering shall be as large as the pin head dimensions will allow so that it is easily read. 4.1.6 May have a handle to aid the operator during hitching and unhitching operations with a maximum height dimension as specified in Table 1
27、and Figure 1. The end user is responsible for selecting the appropriate pin for the application. 4.1.7 Length and head configurations may be optimized on pins supplied by the original equipment manufacturer. ANSI/ASABE S625 MAR2015 Copyright American Society of Agricultural and Biological Engineers
28、3 Table 1 Drawbar pin dimensions Dimensions in mm Key Drawbar Category 0 1 2 3 4 5 K, Pin diameter (min-max) 18-19.2 30-32.2 30-32.2 38-40 50-52 70-72 L, Secondary keeper hole diameter (min) 10 12 12 12 17.5 17.5 M, Pin length (min) 90 142 174 204 218 270 N, Head height (max) 10 15 20 25 25 25 P, He
29、ad diameter or equivalent (max) 40 50 60 70 100 120 R, Useable length of Pin (min) 85 136 168 198 210 262 S, Overall length of Pin (min) 125 150 150 170 175 185 T, Flat length (min) 3 3 4 4 4 4 U, Handle height (max)* 25 25 27 30 35 40 * Note: The dimension U handle height is for pins with fixed han
30、dles relative to the pin body. Larger rings for handles are allowable provided they can fold down as long as all portions of the handle are less than the U dimension. Note: See ANSI/ASABE AD6489-3:2004 for the matching dimensions for the mating part. Figure 1 Drawbar pin ANSI/ASABE S625 MAR2015 Copy
31、right American Society of Agricultural and Biological Engineers 4 4.2 Drawbar pin keeper 4.2.1 Shall be designed to resist 50 000 cycles of an upward load, Fp. See Table 2. 4.2.3 Shall be easily attached or engaged without the use of tools. 4.3 Drawbar pin keeper secondary latch 4.3.1 Shall be desig
32、ned to resist a single maximum upward load, Fs. See Table 2. 4.3.2 Shall be easily attached or engaged without the use of tools. 4.4 Drawbar pin secondary keeper 4.4.1 Shall be designed to resist a single maximum upward load, Fs. See Table 2. 4.4.2 Shall be easily attached or engaged without the use
33、 of tools Table 2 Drawbar pin test forces Drawbar Category 0 1 2 3 4 5 Fe, Endurance test force - kN 15.3 25.2 50.9 71.8 85 107.3 Fi, Impact strength test force - kN 37.5 64.4 144 231.7 295.3 492.1 Fp, Force on drawbar pin keeper - kN 2.5 4 7.5 9 11 15 Fs, Force on secondary drawbar pin keeper - kN
34、1.0 1.6 3.0 3.6 4.4 6.0 , Angle of applied test load 20 20 20 20 20 20 Note: See Appendix A for force calculations. 5 Drawbar Pin Strength Requirements The endurance and impact tests are to be run using separate pins. 5.1 Endurance strength 2 106cycles of a cycling load Fe of 0.05 Fe to Fe without f
35、ailure or crack development. 5.2 Impact strength 100 cycles load Fi of 0.05 Fi to Fi without failure or crack development. 5.3 Force on drawbar pin keeper 50,000 cycles load Fp of 0.05 Fp to Fp without failure or crack development 5.4 Force on drawbar pin secondary keeper 1 cycle load Fs without fai
36、lure or crack development 6 Acceptance No fracture, visible cracks or cracks detectable by non-destructive metallurgical testing, dye penetrants or magnetic particle. The pin must be capable of being freely removed from the test fixture. 7 Drawbar Pin Strength Test Fixture Shall be designed accordin
37、g to Figures 2 and 3, and the dimensions in Table 3. ANSI/ASABE S625 MAR2015 Copyright American Society of Agricultural and Biological Engineers 5 Figure 2 Test load application Figure 3 Drawbar pin test fixture Table 3 Drawbar pin test fixture dimensions Clevis dimensions from ASABE AD6489-3 Dimens
38、ions in mm Dimension Hitch Category 0 1 2 3 4 5 Hitch pin hole A +0.8/-0.25 20 33 33 41 52.5 72.5 Throat depth Bmin 50 70 80 80 90 110 C max 30 40 45 45 65 80 Clevis plate thickness (top and bottom) D max 10 18 26 26 32 40 Clevis opening height Emin 50 70 70 90 90 100 Clevis width F max 60 67 90 90
39、130 160 ANSI/ASABE S625 MAR2015 Copyright American Society of Agricultural and Biological Engineers 6 Figure 4 Towing, towed and leading machines ANSI/ASABE S625 MAR2015 Copyright American Society of Agricultural and Biological Engineers 7 Appendix A (Informative) Drawbar pin impact strength test fo
40、rce DB cat per ISO 6489-3 0 1 2 3 4 5 Max PTO power, kw 28 48 115 185 300 500 Safety factor 1.5 1.5 1.5 1.5 1.5 1.5 Fi = impact strength test force, kN 37.6 64.4 144.0 231.7 295.3 492.1 Max. static vertical load per ISO 6489-3, kN 5 8 15 18 22 30 Drawbar pin endurance strength test force (EC Homol)
41、Mt = unladened mass of tractor (approximated by 0.55 Ma, t (metric ton) Where Ma is the maximum ballasted tractor mass, t(metric ton) 1.4 2.4 5.4 8.7 11.0 18.4 S = max. vert static load per ISO 6489-3 (Reg position) kN 5 8 15 18 22 30 GA = allowable total mass of trailer (implement), t (metric tons)
42、 38.6 37.6 34.6 31.3 29.0 21.6 D = maximum horizontal force applied to the coupling (drawbar) from a fully loaded trailer, kN 13.3 22.2 45.7 66.6 78.4 97.4 Fe = applied test load, kN 15.3 25.2 50.9 71.8 85.0 107.3 Angle of applied test load, arctan(S/D) = 20.6 19.8 18.2 15.1 15.7 17.1 Drawbar pin se
43、condary keeper upward force Secondary keeper upward force, Fu = 0.2S 1.0 1.6 3.0 3.6 4.4 6.0 European maximum train mass for on-road use t (metric ton or 1000 kg) 40 g = acceleration due to gravity = 9.8066 m/s2Definition of loads Total mass of the tractor and trailer is limited to 40 t (1000 kg) Mt
44、 = Tractor mass in ton (1000kg). Limited to 18t for road use. The unladened mass of the tractor including all fluids (fully filled) and operator. It does not include the ballast weights or associated brackets to hold them. S = the allowable vertical load (kN) on the coupling (drawbar pin) by the tra
45、ctor manufacturer. The maximum horizontal force applied to the coupling (drawbar) from a fully loaded trailer GA = allowable total mass of trailer (implement) GA = 40 Mt g = acceleration due to gravity = 9.8066 m/s2()MtGMtGgDAA+= F = applied test load (kN) = angle in degrees of applied load F = (1.5S)2+ D2 1/2 = arctan(S/D)
