BS-AU-50-1.4.6-1996 ISO-7867-2-1996.pdf

BRITISH STANDARD AUTOMOBILE SERIES BS AU 50-1-4.6:1996 ISO 7867-2: 1996 Tyres and wheels Part 1: Tyres Section 4: Agricultural tractor and machine tyres Subsection 4.6 Specification for service description and load ratings for metric series tyres ICS 43.040.50; 83.160.30 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:08:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1-4.6:1996 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 October 1996 © BSI 11-1998 The following BSI references relate to the work on this standard: Committee reference AUE/4 Draft for comment 94/703350 DC ISBN 0 580 26059 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee AUE/4, Tyres and wheels for motor vehicles, upon which the following bodies were represented: Agricultural Engineers Association Automobile Association British Industrial Truck Association British Pressure Gauge Manufacturers Association British Rubber Manufacturers Association Confederation of Passenger Transport UK Department of Transport Freight Transport Association Institute of Road Transport Engineers (Inc) Motor Cycle Industrys Association of Great Britain Ltd. Motor Industry Research Association National Tyre Distributors Association Retread Manufacturers Association Road Haulage Association Ltd. Society of Motor Manufacturers and Traders Ltd. Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:08:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1-4.6:1996 © BSI 11-1998i Contents Page Committees responsibleInside front cover National forewordii 1Scope1 2Normative references1 3Definitions1 4Service description1 5Tyre load ratings3 6Reference inflation pressures4 Annex A (informative) Basic tyre loads5 Annex B (informative) Bibliography8 Table 1 Load indices (LI) and tyre load-carrying capacities (TLCC)2 Table 2 Speed symbol and reference speed3 Table 3 Load/speed relationship3 Table A.1 Load per tyre at reference speed A2 and inflation pressure “95” series tractor tyres for special cultivation work5 Table A.2 Load per tyre at reference speed A8 and inflation pressure “80” series tyres5 Table A.3 Load per tyre at reference speed A8 and inflation pressure “75” series tyres5 Table A.4 Load per tyre at reference speed A8 and inflation pressure “70” series tyres6 Table A.5 Load per tyre at reference speed A8 and inflation pressure “65” series tyres7 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:08:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1-4.6:1996 ii © BSI 11-1998 National foreword This Subsection of BS AU 50 has been prepared by Technical Committee AUE/4 and is identical to ISO 7867-2:1996 Tyres and rims (metric series) for agricultural tractors and machines Part 2: Service description and load ratings, published by the International Organization for Standardization (ISO). BS AU 50 is published in four Parts: Part 1: Tyres; Part 2: Wheels and rims; Part 3: Valves; Part 4: Rim profiles and dimensions. ISO 7867 specifies requirements for metric series tyres and rims for agricultural tractors and machines and ISO 8664 specifies requirements for agricultural tractor drive-wheel tyres. The Technical Committee has reviewed the provisions of ISO 4223-1, to which normative reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A British Standard does not 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. Cross-references Publication referred toCorresponding British Standard BS AU 50 Tyres and wheels Part 1 Tyres Section 4 Agricultural tractor and machine tyres ISO 7867-1:1996Subsection 4.5a:1996 Specification for designations, dimensions, marking and tyre/rim coordination for metric series tyres (Identical) Part 4 Rim profiles and dimensions Section 4 Agricultural tractor and machine rims ISO 4251-3:1994Subsection 4.1a:1995 Specification for ply-rating marked series rims (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:08:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1-4.6:1996 © BSI 11-19981 1 Scope This part of ISO 7867 establishes the service description, the tyre load ratings in basic and special applications and reference inflation pressure increments for the metric series of tyres primarily intended for agricultural tractors and machines. It applies to bias-belted, diagonal and radial tyres mounted on 5° tapered rims, as specified in ISO 4251-3. It also applies to different concepts and types of tyres and rims; in these cases, however, appropriate load/speed-curves and reference inflation pressure increments will be established and added. Basic tyre load-carrying capacities for ranges of existing tyres are given in annex A. NOTE 1Designation and marking of the metric series is defined in ISO 7867-1. Code (ply rating) marked series of tyres and rims for agricultural tractors and machines are specified in ISO 4251-1, ISO 4251-2 and ISO 4251-5. Service description (load index speed symbol) marking of existing series of agricultural tractor-drive-wheel tyres is given in ISO 8664. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 7867. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 7867 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 4223-1:1989, Definitions of some terms used in the tyre industry Part 1: Pneumatic tyres. ISO 4251-3:1994, Tyres (ply rating marked series) and rims for agricultural tractors and machines Part 3: Rims. ISO 7867-1:1996, Tyres and rims (metric series) for agricultural tractors and machines Part 1: Tyre designation, dimensions, marking and tyre/rim coordination. 3 Definitions For the purposes of this part of ISO 7867, the definitions given in ISO 4223-1 and ISO 7867-1 apply. 4 Service description The service description shall be indicated as follows: 4.1 Load index The load index is a numerical code associated with a maximum load a tyre can carry at the speed indicated by its speed symbol under service conditions specified by the tyre manufacturer. The correlation between load indices and tyre load-carrying capacities shall be as given in Table 1. Load indexSpeed symbol Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:08:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1-4.6:1996 2 © BSI 11-1998 Table 1 Load indices (LI) and tyre load-carrying capacities (TLCC) LITLCCLITLCCLITLCCLITLCCLITLCC kgkgkgkgkg 04540140804501201 4001604 500 146,241145814621211 4501614 625 247,542150824751221 5001624 750 348,743155834871231 5501634 875 45044160845001241 6001645 000 551,545165855151251 6501655 150 65346170865301261 7001665 300 754,547175875451271 7501675 450 85648180885601281 8001685 600 95849185895801291 8501695 800 106050190906001301 9001706 000 1161,551195916151311 9501716 150 126352200926301322 0001726 300 136553206936501332 0601736 500 146754212946701342 1201746 700 156955218956901352 1801756 900 167156224967101362 2401767 100 177357230977301372 3001777 300 187558236987501382 3601787 500 1977,559243997751392 4301797 750 2080602501008001402 5001808 000 2182,5612571018251412 5751818 250 2285622651028501422 6501828 500 2387,5632721038751432 7251838 750 2490642801049001442 8001849 000 2592,5652901059251452 9001859 250 2695663001069501463 0001869 500 2797,5673071079751473 0751879 750 28100683151081 0001483 15018810 000 29103693251091 0301493 25018910 300 30106703351101 0601503 35019010 600 31109713451111 0901513 45019110 900 32112723551121 1201523 55019211 200 33115733651131 1501533 65019311 500 34118743751141 1801543 75019411 800 35121753871151 2151553 87519512 150 36125764001161 2501564 00019612 500 37128774121171 2851574 12519712 850 38132784251181 3201584 25019813 200 39136794371191 3601594 37519913 600 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:08:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1-4.6:1996 © BSI 11-19983 4.2 Speed symbol The speed symbol is a symbol indicating the speed at which the tyre can carry a load corresponding to its index under service conditions specified by the tyre manufacturer. The correlation between speed symbols and reference speeds shall be as given in Table 2. 5 Tyre load ratings 5.1 Basic tyre loads Basic tyre load is the tyre load-carrying capacity indicated by the tyres load index at the reference speed indicated by the tyres speed symbol. Load for dual tyres equals 1,76 times the load for a single tyre. For basic tyre loads for ranges of existing tyres, see annex A. 5.2 Tyre applications other than at reference speed For applications without high and sustained torques, including road transport, the load/speed relationship is given in Table 3. The tyre manufacturer concerned shall be consulted for the actual pressure to be used when applying the load/speed relationship given in Table 3. The rim/wheel manufacturer shall be consulted for confirmation of the strength of the rim/wheel for the intended service. Table 2 Speed symbol and reference speed Table 3 Load/speed relationship 5.3 Tyre application on combine harvesters (A8 tyres only) On combine harvesters in cyclic loading application, except hillside combines, a load of up to 170 % of the basic tyre loads is permitted for speeds up to 10 km/h with an inflation pressure increase of approximately 30 %, in consultation with the tyre manufacturer. This load increase shall include all possible field and user modifications that increase the vehicle mass and shall apply only to load increases which occur during the harvesting process. When not in cyclic application (as for instance when grain tanks are empty during transport) the loads in Table 3 apply. For hill-side operations over 11° (22 %) slope, only the basic tyre loads are permitted. The rim and wheel manufacturer shall be consulted concerning the strength of the wheels. Speed symbolReference speed km/h A15 A210 A315 A420 A525 A630 A735 A8a 40 B50 NOTEThis list of speed symbols is not restrictive; other categories may be determined later. a Recommended speed symbol for tyres for agricultural tractors and machines. Maximum tyre loada SpeedTyres with speed symbol A2 (10 km/h reference speed) Tyres with speed symbol A8 (40 km/h reference speed)km/h 10100150 1594134 2089123 2584111 3080 107b 3576103 4073100 4596 5091 a Expressed as a percentage of the basic tyre loads. b This also applies for all field applications with high and sustained torques. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:08:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1-4.6:1996 4 © BSI 11-1998 6 Reference inflation pressures The following reference inflation pressures are recommended for basic tyre loads of different ranges of tyres (metric series) for agricultural tractors and machines. 100 kPa 120 kPa 140 kPa 160 kPa 200 kPa 240 kPa 280 kPa 320 kPa 360 kPa 400 kPa 440 kPa NOTE 2These reference inflation pressures are for basic tyre loads of different ranges of metric agricultural tyres. Operating pressures may be different. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:08:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1-4.6:1996 © BSI 11-19985 Annex A (informative) Basic tyre loads A.1 This annex gives information additional to 5.1. A.2 Load indices and basic tyre loads for ranges of existing tyres are given in Table A.1 to Table A.5. Table A.1 Load per tyre at reference speed A2 and inflation pressure “95” series tractor tyres for special cultivation work Table A.2 Load per tyre at reference speed A8 and inflation pressure “80” series tyres Table A.3 Load per tyre at reference speed A8 and inflation pressure “75” series tyres Tyre size designation Load indexBasic tyre load Reference inflation pressurea LIkgkPa 180/95R 401201 400 320 210/95R 441241 600 R 401301 900 230/95R 441322 000 R 481342 120 270/95R 481402 500 230/95 R 321392 430 440 R 361412 575 R 441452 900 R 481473 075 270/95 R 481533 650 R 541574 125 a The inflation pressure is a minimum reference value for the loads given in the table. The tyre manufacturer concerned shall be consulted about the actual pressures to be used in practice. Tyre size designation Load indexBasic tyre load Reference inflation pressurea LIkgkPa 420/80R 461452 900160 a The inflation pressure is a minimum reference value for the loads given in the table. The tyre manufacturer concerned shall be consulted about the actual pressures to be used in practice. Tyre size designation Load indexBasic tyre load Reference inflation pressurea LIkgkPa 340/75R 201171 285 160 380/75R 201211 450 620/75 R 261533 650 R 301553 875 R 341574 125 650/75R 341624 750 680/75R 321645 000 710/75R 341685 600 620/75 R 261665 300 R 301685 600320 R 341706 000 a The inflation pressure is a minimum reference value for the loads given in the table. The tyre manufacturer concerned shall be consulted about the actual pressures to be used in practice. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:08:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1-4.6:1996 6 © BSI 11-1998 Table A.4 Load per tyre at reference speed A8 and inflation pressure “70” series tyres Tyre size designation Load indexBasic tyre load Reference inflation pressurea LIkgkPa 300/70R 201101 060 120 R 201131 150 320/70R 241161 250 R 281191 360 R 201201 400 360/70R 241221 500 R 281251 650 R 201221 500 380/70R 241251 650 R 281271 750 R 241301 900 420/70R 281332 060 R 301342 120 480/70 R 241382 360 R 261392 430 R 281402 500 R 301412 575 R 341432 725 R 381452 900 520/70 R 261432 725 R 301452 900 R 341483 150 R 381503 350 R 261452 900 580/70R 381553 875 R 42