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1、BRITISH STANDARD AUTOMOBILE SERIES BS AU 50-1-4.2b:1999 ISO 4251-2: 1998 Tyres and wheels Part 1: Tyres Section 4: Agricultural tractor and machine tyres Subsection 4.2b: Specification for load ratings for ply rating marked series tyres ICS 65.060.01; 83.160.30 Licensed Copy: London South Bank Unive
2、rsity, London South Bank University, Sat Dec 09 02:11:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1-4.2b:1999 This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into ef
3、fect on 15 March 1999 BSI 07-1999 ISBN 0 580 30771 9 National foreword This British Standard reproduces verbatim ISO 4251-2:1998 and implements it as the UK national standard. It supersedes BS AU 50-1-4.2a:1993 which is withdrawn. The UK participation in its preparation was entrusted to Technical Co
4、mmittee AUE/4, Tyres and wheels for motor vehicles, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related int
5、ernational and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be fou
6、nd 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 not purport to include all the necessary provisions of a contract. Users of British Standard
7、s are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ISO title page, page ii, pages 1 to 10 and a back cover. T
8、his 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. Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Sa
9、t Dec 09 02:11:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1-4.2b:1999 BSI 07-1999i Contents Page National forewordInside front cover Forewordii 1Scope1 2Normative reference1 3Definitions1 4Tyres loads1 Annex A (informative) Tyres on nominal rim diameter codes 15.3 and 16.19 Annex B (info
10、rmative) Bibliography10 Table 1 Agricultural drive wheels Tractor tyres (diagonal construction normal section height) Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP)2 Table 2 Agricultural drive wheels Tractor tyres (diagonal construction low section heigh
11、t) Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP)3 Table 3 Agricultural drive wheels Tractor tyres Tyre loads at different speeds (load/speed relationship)3 Table 4 Agricultural drive wheels Tractor tyres used as duals (diagonal construction normal secti
12、on height) Load per tyre (L) for a maximum speed of 30 km/h and reference inflation pressures (IP)4 Table 5 Agricultural drive wheels Tractor tyres used as duals (diagonal construction low section height) Load per tyre (L) for a maximum speed of 30 km/h and reference inflation pressures (IP)5 Table
13、6 Agricultural drive wheels Tractor tyres for special cultivation work (diagonal and radial construction) Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP)5 Table 7 Agricultural drive wheels Tractor tyres for special cultivation work (diagonal and radial co
14、nstruction) Tyre loads (L) for special cultivation work at a maximum speed of 10 km/h and reference inflation pressures (IP)5 Table 8 Agricultural steering wheels Tractor tyres (diagonal construction normal section height) Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation
15、 pressures (IP)6 Table 9 Agricultural steering wheels Tractor tyres (diagonal construction low section height) Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP)6 Table 10 Agricultural steering wheels Tractor tyres Tyre loads at different speeds (load/speed
16、relationship)6 Table 11 Agricultural implement tyres (diagonal construction normal section height) Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP)7 Table 12 Agricultural implement tyres (diagonal construction low section height) Basic tyre loads (BTL) for
17、 a maximum speed of 30 km/h and reference inflation pressures (IP)8 Table A.1 Agricultural steering wheels Tractor tyres (diagonal construction low section height) Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP)9 Table A.2 Agricultural implement tyres (di
18、agonal construction normal section height) Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP)9 Table A.3 Agricultural implement tyres (diagonal construction low section height) Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pre
19、ssures (IP) 9 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:11:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:11:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI L
20、icensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:11:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1-4.2b:1999 ii BSI 07-1999 Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO m
21、ember 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 been established has the right to be represented on that committee. International organizations, governm
22、ental 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 standardization. Draft International Standards adopted by the technical committees are circulated to the m
23、ember bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 4251-2 was prepared by Technical Committee ISO/TC 31, Tyres, rims and valves, Subcommittee SC 5, Agricultural tyres and rims. This fift
24、h edition cancels and replaces the fourth edition (ISO 4251-2:1992), of which it constitutes a technical revision. ISO 4251 consists of the following parts, under the general title Tyres (ply rating marked series) and rims for agricultural tractors and machines: Part 1: Tyre designation and dimensio
25、ns, and approved rim contours; Part 2: Tyre load ratings; Part 3: Rims; Part 4: Tyre classification and nomenclature; Part 5: Log skidder tyres. Annex A and Annex B of this part of ISO 4251 are for information only. Descriptors: Agricultural machinery, agricultural tractors, tyres, pneumatic tyres,
26、loads (forces), load capacity, ratings. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:11:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1-4.2b:1999 BSI 07-19991 1 Scope This part of ISO 4251 specifies load ratings for the ply rating marked series of
27、 tyres for agricultural tractors and machines. Tyre designation and dimensions, and approved rim contours, rim dimensions, and tyre classification and nomenclature are given in ISO 4251-1, ISO 4251-3 and ISO 4251-4 respectively. Service description (load index and speed symbol) marking for existing
28、series (ply rating marked series) of agricultural tractor drive-wheel tyres of radial construction are given in ISO 8664. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this part of ISO 4251. At the time of publication
29、, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this part of ISO 4251 are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently
30、 valid International Standards. ISO 4223-1:1989, Definitions of some terms used in the tyre industry Part 1: Pneumatic tyres. 3 Definitions For the purposes of this part of ISO 4251, the definitions given in ISO 4223-1 and the following definitions apply. 3.1 load/inflation pressure relationship loa
31、ds as given in the tables which are maximum values and are valid for the reference inflation pressures indicated 3.2 cyclic loading application gradual increase of pay load to maximum allowable load with unloading before off-field transport 4 Tyres loads 4.1 Agricultural drive wheels Tractor tyres B
32、asic tyre loads for a maximum speed of 30 km/h, and corresponding reference inflation pressures are given in a) Table 1 for tyres of diagonal construction with normal section height; b) Table 2 for tyres of diagonal construction with low section height. On combine harvesters in cyclic loading applic
33、ation, except hillside combines, a load of up to 170 % of the basic tyre loads given in Table 1 and Table 2 is permitted for speeds up to 10 km/h with an inflation pressure increase of approximately 30 % (consult tyre manufacturers). This load increase shall include all possible field and user modif
34、ications that increase the vehicle mass. The wheel and rim manufacturers shall be consulted concerning the strength of the wheels. Tyre loads at different speeds (load/speed relationship) are given in Table 3 for tyres of diagonal construction with normal section height and tyres of diagonal constru
35、ction with low section height. Load for tyres in dual application for a maximum speed of 30 km/h, and corresponding reference inflation pressures are given in a) Table 4 for tyres of diagonal construction with normal section height; b) Table 5 for tyres of diagonal construction with low section heig
36、ht. Loads for tyres of diagonal and radial construction for special cultivation work and corresponding reference inflation pressures are given in a) Table 6 for a maximum speed of 30 km/h; b) Table 7 for cultivation work at a maximum speed of 10 km/h. 4.2 Agricultural steering wheels Tractor tyres B
37、asic tyre loads for a maximum speed of 30 km/h, and corresponding reference inflation pressures are given in a) Table 8 for tyres of diagonal construction with normal section height; b) Table 9 for tyres of diagonal construction with low section height. Tyre loads at different speeds (load/speed rel
38、ationship) are given in Table 10 for tyres of diagonal construction with normal and low sections. 4.3 Agricultural implement tyres Basic tyre loads for a maximum speed of 30 km/h, tyre loads for other speeds and special applications and corresponding reference inflation pressures are given in a) Tab
39、le 11 for tyres of diagonal construction with normal section height; b) Table 12 for tyres of diagonal construction with low section height. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:11:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1-4.2b:1999
40、2 BSI 07-1999 Table 1 Agricultural drive wheels Tractor tyres (diagonal construction normal section height) Basic tyre loads (BTL) for a maximum speed of 30 km/h and reference inflation pressures (IP) Tyre size4 PR6 PR8 PR10 PR12 PR14 PR BTL kg IP kPa BTL kg IP kPa BTL kg IP kPa BTL kg IP kPa BTL kg
41、 IP kPa BTL kg IP kPa 8.3 24625160810240 9.5 24 9.5 32 9.5 36 740 840 890 140 940 1 065 1 130 210 1 110 1 260 1 335 280 11.2 24845 130 1 045 180 1 225 240 1 380300 11.2 289001 1151 305 12.4 24 12.4 28 12.4 32 12.4 36 12.4 38 945 1 005 1 070 1 135 1 165 110 1 200 1 275 1 355 1 440 1 480 170 1 415 1 5
42、10 1 605 1 700 1 750 2301 800280 13.6 24 13.6 28 13.6 36 13.6 38 1 030 1 100 1 240 1 275 100 1 340 1 430 1 615 1 660 160 1 545 1 645 1 855 1 910 200 1 790 1 910 2 150 2 215 250 14.9 24 14.9 26 14.9 28 14.9 30 14.9 38 1 510 1 560 1 610 1 665 1 870 140 1 760 1 820 1 880 1 940 2 180 180 1 990 2 055 2 1
43、20 2 190 2 460 230 15.5 381 7651402 0601802 320230 16.9 24 16.9 26 16.9 28 16.9 30 16.9 34 16.9 38 1 725 1 780 1 840 1 900 2 015 2 130 130 2 040 2 105 2 175 2 245 2 380 2 520 170 2 230 2 305 2 380 2 455 2 605 2 760 200 2 730240 18.4 26 18.4 30 18.4 34 18.4 38 18.4 42 1 990 2 120 2 250 2 380 110 2 26
44、5 2 415 2 565 2 715 2 865 140 2 645 2 815 2 990 3 165 3 340 80 2 985 3 180 3 375 3 575 3 765 2303 630260 20.8 34 20.8 38 20.8 42 2 920 3 090130 3 285 3 475 3 670 160 3 785 4 000 4 225 200 23.1 26 23.1 30 23.1 34 2 850 3 025 3 225 110 3 245 3 460 3 675 140 3 610 3 850 4 090 170 3 970200 24.5 323 9501
45、404 390170 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:11:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1-4.2b:1999 BSI 07-19993 Table 2 Agricultural drive wheels Tractor tyres (diagonal construction low section height) Basic tyre loads (BTL) for
46、 a maximum speed of 30 km/h and reference inflation pressures (IP) Table 3 Agricultural drive wheels Tractor tyres Tyre loads at different speeds (load/speed relationship) Tyre size10 PR12 PR14 PR BTL kg IP kPa BTL kg IP kPa BTL kg IP kPa 28 L 263 4601203 7851404 245170 30.5 L 324 745140 Maximum spe
47、eda km/h Maximum tyre loadb 10c 20 25 30 140 120 107 100 a The values given for the maximum tyre loads also apply when drive wheel tractor tyres are fitted on the front axles (steering wheels). b Expressed as a percentage of the basic tyre loads given in Table 1 and Table 2. If national legislation
48、permits speeds in excess of 30 km/h, for example up to 40 km/h, a tyre load of 90 % of the basic tyre load shall be permitted at a speed of 35 km/h, and a tyre load of 80 % of the basic tyre load shall be permitted at a speed of 40 km/h. Tyres intended for higher speeds, for example multipurpose app
49、lications (MPT), will form the subject of a future International Standard. c This applies to drive wheel tractor tyres fitted on front axles of front-end loaders used in intermittent service. Tyre inflation pressures have to be increased by 30 kPa for operating at these overloads. Licensed Copy: London South Bank University, London South Bank Univers