1、BRITISH STANDARD BS ISO 7867-1:2005 Tyres and rims (metric series) for agricultural tractors and machines Part 1: Tyre designation, dimensions and marking, and tyre/rim coordination ICS 83.160.30 BS ISO 7867-1:2005 This British Standard was published under the authority of the Standards Policy and S
2、trategy Committee on 26 August 2005 BSI 26 August 2005 ISBN 0 580 46472 5 National foreword This British Standard reproduces verbatim ISO 7867-1:2005 and implements it as the UK national standard. It supersedes BS AU 50-1.4.5a:1996 which is withdrawn. The UK participation in its preparation was entr
3、usted to Technical Committee AUE/4, Tyres and wheels for motor vehicles, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to i
4、n this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of
5、a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or propo
6、sals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, The BSI copyright notice displayed in this document indicates whe
7、n the document was last issued. Amendments issued since publication Amd. No. Date Comments pages ii to iv, pages 1 to 18, an inside back cover and a back cover. Reference number ISO 7867-1:2005(E)INTERNATIONAL STANDARD ISO 7867-1 Fourth edition 2005-06-15 Tyres and rims (metric series) for agricultu
8、ral tractors and machines Part 1: Tyre designation, dimensions and marking, and tyre/rim coordination Pneumatiques et jantes (srie millimtrique) pour tracteurs et machines agricoles Partie 1: Dsignation, cotes et marquage des pneumatiques, coordination pneumatiques/jantes BS ISO 7867-1:2005ii iii Co
9、ntents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 2 4 Tyre designation . 2 5 Marking 5 6 Tyre dimensions . 5 7 Tyre dimensions . 7 8 Method of measurement of tyre dimensions . 7 9 Tyre and rim coordination . 8 Annex A (normative) Tyre dimensions 9 Annex B (norma
10、tive) Approved rim widths . 11 Annex C (informative) Approved rim contours . 13 Bibliography . 18 BS ISO 7867-1:2005iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Sta
11、ndards 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, governmental and non-governmental, in liaison with ISO, also
12、take part in the work. ISO collaborates closely with the International Electrotechnical Commission (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
13、 is to prepare International Standards. Draft International Standards adopted by the technical 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 possibi
14、lity that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 7867-1 was prepared by Technical Committee ISO/TC 31, Tyre, rims and valves, Subcommittee SC 5, Agricultural tyres and rims. This
15、fourth edition cancels and replaces the third edition (ISO 7867-1:1996), which has been technically revised. ISO 7867 consists of the following parts, under the general title Tyres and rims (metric series) for agricultural tractors and machines: Part 1: Tyre designation, dimensions and marking, and
16、tyre/rim coordination Part 2: Service description and load ratings BS ISO 7867-1:20051 Tyres and rims (metric series) for agricultural tractors and machines Part 1: Tyre designation, dimensions and marking, and tyre/rim coordination 1 Scope This part of ISO 7867 establishes the size designation, the
17、 dimensional calculation and the markings of the metric series of tyres primarily intended for use on agricultural tractors and machines. Tyre and rim coordination is also given. It applies to bias-belted, diagonal and radial tyres mounted an 5 tapered rims, as specified in ISO 4251-3. Only establis
18、hed rim diameters and widths within the ranges in Tables 1 and 2 are recommended. This part of ISO 7867 also applies to different concepts and types of tyres and rims; in this case, however, appropriate rim/section ratios K 1and coefficients K 2 , a and b will be established and added. Dimensions of
19、 existing rims are specified in ISO 4251-3. NOTE Tyres (ply rating marked series) and rims for agricultural tractors and machines are specified in ISO 4251-1 to ISO 4251-5. Service description (load index speed symbol) marking of the existing series of agricultural tractor-drive- wheel tyres is give
20、n in ISO 8664. 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 4223-1:
21、2002, 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 7867-2, Tyres and rims (metric series) for agricultural tractors and machines Part 2: Service descripti
22、on and load ratings BS ISO 7867-1:20052 3 Terms and definitions For the purposes of this part of ISO 7867, the terms and definitions given in ISO 4223-1 and the following apply. 3.1 agricultural tyre for special cultivation work tyre for use on wheels (usually tractor drive wheels) on agricultural m
23、achines engaged in surface work or linear cultivation and the transport on roads and tracks of the tools required for such work 4 Tyre designation 4.1 General The designation of the tyre shall be shown on its sidewall and shall include the following markings close to each other: size and constructio
24、n characteristics (see 4.2); service description (see 4.3). 4.2 Size and construction characteristics 4.2.1 General The size and construction characteristics shall be indicated as follows: 4.2.2 Nominal section width The nominal section width shall be expressed in millimetres and shall end in 0. 4.2
25、.3 Nominal aspect ratio The nominal aspect ratio shall be expressed as a percentage and shall be a multiple of 5. 4.2.4 Tyre construction code The tyre construction code shall be as follows: “B” for bias-belted construction; “D” for diagonal/bias construction; “R” for radial construction. NOTE Other
26、 codes will be established for new concepts (constructions) of tyres. 4.2.5 Nominal rim diameter code For tyres mounted on 5 tapered rims, the rim diameter shall be expressed by a code comprising 1 or 2 digits. The code shall be as given in Table 1. For tyres requiring new-concept rims, for safety r
27、easons especially concerning mounting the code number shall be equal to the nominal rim diameter expressed in an integral number of millimetres, i.e. comprising 3 or 4 digits. BS ISO 7867-1:20053 Table 1 Nominal rim diameter code Nominal rim diameter codeaNominal rim diameter, D rmm 4 101 6 152 8 20
28、3 (9) 229 10 254 12 305 (13) 330 14 356 (15) 381 16 406 (17) 432 18 457 (19) 483 20 508 22 559 24 610 25 635 26 660 28 711 30 762 32 813 34 864 36 914 38 965 40 1 016 42 1 067 44 1 118 46 1 168 48 1 219 50 1 270 52 1 321 54 1 372 aValues in parentheses are not recommended. BS ISO 7867-1:20054 Table
29、2 Rim width code Rim width code Measuring rim width, R mmm 2.50 63,5 3.00 76,2 3.50 88,9 4.00 101,6 4.50 114,3 5.00 127 5.50 139,7 6.00 152,4 7.00 177,8 8.00 203,2 9.00 228,6 10.00 254 11.00 279,4 12.00 304,8 13.00 330,2 14.00 355,6 15.00 381 16.00 406,4 18.00 457,2 20.00 508 21.00 533,4 23.00 584,2
30、 25.00 635 27.00 685,8 28.00 711,2 31.00 787,4 36.00 914,4 44.00 1 117,6 4.2.6 Rim width code For tyres mounted on 5 tapered rims, the rim width shall be expressed by a code, as given in Table 2. For tyres requiring new-concept rims, other code numbers will be established. 4.3 Service description Th
31、e service description shall be indicated as follows: load index speed symbol The characteristics are specified and explained in ISO 7867-2. 4.4 Other service characteristics 4.4.1 In the case of tubeless tyres, the marking “TUBELESS” shall be shown on the tyre. 4.4.2 In the case of a preferred direc
32、tion of rotation of the tyre, an arrow shall be used to indicate that direction. 4.4.3 Specific indications, if required, may be added to indicate other characteristics. BS ISO 7867-1:20055 4.5 Tyre classification and nomenclature (optional) A tyre classification code use of which is optional may be
33、 used to describe the primary field of application for the tyre. NOTE Nomenclature and a classification code are under study. 5 Marking Tyres meeting the size and construction requirements and service description of this part of ISO 7867 shall be marked on the sidewall as shown in the example below.
34、 EXAMPLE A tyre having a) size and construction characteristics of nominal section width 480 mm, nominal aspect ratio 70, radial construction (symbol R), nominal rim diameter code 38; b) service description of basic load 2 900 kg (load index 145), reference speed 40 km/h (speed symbol A8). The above
35、 tyre will be marked 480/70 R 38 145A8 In addition, other service characteristics, such as tubeless will be marked: TUBELESS 6 Tyre dimensions 6.1 Calculation of “design tyre” dimensions 6.1.1 Theoretical rim width, R thThe theoretical rim width R this equal to the product of the nominal section wid
36、th S Nand the rim/section ratio K 1 : th 1 N R KS = For factor K 1 , see Table 3. BS ISO 7867-1:20056 6.1.2 Measuring rim width, R mThe measuring rim width R mis the width of the standardized rim nearest to the theoretical rim width R th(see Table 2 and Annex A). 6.1.3 Design tyre section width, S T
37、he design tyre section width S is a nominal section width S N , transferred from the theoretical rim width R thto the measuring rim width R m : N2mt h () SSKRR =+ Round to the nearest whole number. For factor K 2 , see Table 3. 6.1.4 Design tyre section height, H The design tyre section height H is
38、equal to the product of the nominal section width S Nand the nominal aspect ratio / H S divided by 100: N / 100 H S HS = 6.1.5 Design tyre overall diameter, D oThe design tyre overall diameter D ois equal to the nominal rim diameter D rplus twice the tyre section height H: or 2 D DH =+ For those tyr
39、es using a rim diameter code comprising 1 or 2 digits, see Table 1 for the value of D r , in millimetres, to be used. 6.2 Calculation of “minimum overall tyre dimensions” 6.2.1 Minimum overall width, W minThe minimum overall width W minis equal to the product of the design tyre section width S and t
40、he appropriate coefficient c (see Table 3): min WS c = 6.2.2 Minimum overall diameter, D o,minThe minimum overall diameter D o,minis equal to the nominal rim diameter D rplus twice the product of design tyre section height H and the appropriate coefficient d (see Table 3): o,min r 2 D DH d =+ 6.3 Ca
41、lculations of “maximum overall tyre dimensions in service” 6.3.1 General These calculations are for use by vehicle manufacturers in designing for tyre clearance. BS ISO 7867-1:20057 6.3.2 Maximum overall width in service, W maxThe maximum overall width in service W maxis equal to the product of the
42、design tyre section width S and the appropriate coefficient a (see Table 3): max WS a = It includes protective ribs, lettering, embellishments, manufacturing tolerances and growth due to service. 6.3.3 Maximum overall diameter in service, D o,maxThe maximum overall diameter in service D o,maxis equa
43、l to the nominal rim diameter D rplus twice the product of the design tyre section height H and the appropriate coefficient b (see Table 3): o,max r 2 D DH b =+ It includes manufacturing tolerances, the different types of tread patterns (see footnote to Table 3) and growth due to service. 6.4 Coeffi
44、cients for calculation of tyre dimensions For all types of tyres (for tractor drive, tractor steer, implement and garden tractor wheels) of all structures (bias-belted, diagonal/bias and radial construction) with nominal aspect ratio /5 0 HS W mounted on 5 tapered rims, the coefficients for the calc
45、ulation of tyre dimensions shall be as given in Table 3. For tyres with ratio /5 0 HS and/or different-concept tyres and rims, other coefficients will be defined. Table 3 Coefficients for calculation of tyre dimensions Coefficients Structure Tyre construction code K 1K 2a b ac d Bias-belted B Diagon
46、al/bi as D 1,08 1,07 Radial R 0,8 0,4 1,05 1,04 0,96 0,97 aValues are based on regular service tyres. The user should recognize that deep treads and corresponding increased overall diameters may be used for certain specialized tyres. 7 Tyre dimensions For the relevant dimensions of tyres (metric ser
47、ies) for traction wheels and steering wheels of agricultural tractors and machines, and for agricultural implements, see Annex A. 8 Method of measurement of tyre dimensions Before being measured, the tyre shall be mounted on its measuring rim, inflated with air or nitrogen to the recommended pressur
48、e, and allowed to stand for a minimum of 24 h at normal room temperature, after which the inflation pressure shall be readjusted to the original value. BS ISO 7867-1:20058 9 Tyre and rim coordination 9.1 Approved rim width For all types of tyres (for tractor drive, tractor steer, implement and garde
49、n tractor wheels) of all structures (bias-belted, diagonal/bias and radial construction) mounted on 5 tapered rims, the coefficients for the calculation of approved rim widths shall be as given in Table 4. The values shall be rounded to the nearest standardized rim from the first column of Table 2. Table 4 Coefficients for calculation of approved rim widths Rim width Aspect ratio, H / S, % 95 90 to 70 u 6
