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1、BRITISH STANDARD AUTOMOBILE SERIES BS AU 50-1.4.8:1998 ISO 11795: 1997 Tyres and wheels Part 1: Tyres Section 4: Agricultural tractor and machine tyres Subsection 4.8 Method of measuring tyre rolling circumference for agricultural tractor drive wheels ICS 65.060.01; 83.160.30 Licensed Copy: London S
2、outh Bank University, London South Bank University, Sat Dec 09 02:11:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1.4.8:1998 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 i
3、nto effect on 15 March 1998 BSI 04-1999 ISBN 0 580 29174 X National foreword This British Standard reproduces verbatim ISO 11795:1997 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee AUE/4, Wheels and tyres for motor vehicles
4、, 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 international and European developments and promulgat
5、e 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 found in the BSI Standards Catalogue under the sectio
6、n 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 Standards are responsible for their correct application. C
7、ompliance 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, pages ii to iv, pages 1 and 2, an inside back cover and a back cover. This standard has been
8、 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, Sat Dec 09 02:11:18 GMT
9、+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1.4.8:1998 BSI 04-1999i Contents Page National forewordInside front cover Forewordiii Text of ISO 117951 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:11:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank
10、 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:11:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:11:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1.4.8:1998 ii
11、BSI 04-1999 Contents Page Forewordiii Introduction1 1Scope1 2Normative references1 3Definition1 4Principle1 5Test conditions1 5.1Tyre installation1 5.2Test tyres1 5.3Tyre load and inflation pressure1 5.4Tyre measurement1 5.5Test course2 5.6Weather conditions2 5.7Test measurement2 5.8Test speed2 6Met
12、hod of test2 6.1Test preparation2 6.2Test procedure2 7Expression of results2 8Test report2 9Other test conditions2 Annex A (informative) BibliographyInside back cover Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:11:18 GMT+00:00 2006, Uncontrolled Copy, (c)
13、 BSI BS AU 50-1.4.8:1998 BSI 04-1999iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member bo
14、dy 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 take part in the work. ISO collaborates closely with the International Electrot
15、echnical Commission (IEC) on all matters of electrotechnical standardization. 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 v
16、ote. International Standard ISO 11795 was prepared by Technical Committee ISO/TC 31, Tyres, rims and valves, Subcommittee SC 5, Agricultural tyres and rims. Annex A of this International Standard is for information only. Descriptors: Agricultural machinery, agricultural tractors, drive-wheels, tyres
17、, pneumatic tyres, tests, determination, circumference, dimensional measurements. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:11:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank Universi
18、ty, Sat Dec 09 02:11:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1.4.8:1998 BSI 04-19991 Introduction Matching front and rear wheels with different tyre sizes on four-wheel drive agricultural tractors requires accurate rolling circumference values. The test method to determine rolling cir
19、cumference outlined below was developed to follow this requirement. The values thus obtained are not intended for use as levels of performance or quality. The test speed has been set at typical working speed when the four-wheel drive will likely be engaged and the most critical match is required. Ge
20、nerally, the four-wheel drive is disengaged at roading speeds. Therefore, the determination of rolling circumference is not related to the tyres maximum speed, e.g. 30 km/h or 40 km/h. Nevertheless, other speeds or conditions may be run provided it is clearly documented in the results. 1 Scope This
21、International Standard specifies the method for measuring rolling circumference for new tyres, under loaded conditions, made for use on agricultural tractors and machines, and applies to agricultural tractor drive wheel tyres in diagonal and radial construction. 2 Normative references The following
22、standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encourage
23、d 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 4251-1:1), Tyres (ply rating marked series) and rims for agricultural tractors and machines Part 1: Tyre d
24、esignation and dimensions, and approved rim contours. ISO 4251-2:2), Tyres (ply rating marked series) and rims for agricultural tractors and machines Part 2: Tyre load ratings. ISO 7867-1:1996, Tyres and rims (metric series) for agricultural tractors and machines Part 1: Tyre designation, dimensions
25、, marking and tyre/rim coordination. ISO 7867-2:1996, Tyres and rims (metric series) for agricultural tractors and machines Part 2: Service description and load ratings. ISO 8664:1992, Agricultural tractor drive-wheel tyres Service description (load index speed symbol) marked tyres. 3 Definition For
26、 the purposes of this International Standard, the following definition applies. 3.1 rolling circumference of tyre distance that the (axle) centre of the tyre moves in one revolution of the tyre under the conditions specified in clause 5 4 Principle The measurement consists of driving a typical vehic
27、le equipped with the test tyres on the drive axle, on a straight, level road at a constant speed, and counting the number of tyre revolutions (or portions thereof) that occur while traversing a measured distance. 5 Test conditions 5.1 Tyre installation Tyre to be tested shall be installed as a singl
28、e on the drive wheels of a vehicle which shall be representative of that used with the tyre size being tested. An approved rim in accordance with ISO 4251-1, ISO 7867-1 or ISO 8664 shall be used. Only the test axle shall be driven. 5.2 Test tyres The tyres shall be a matched set of the same size des
29、ignation, type, and brand, having inflated, unloaded overall diameters within 0,5 % of each other. 5.3 Tyre load and inflation pressure The load on each tyre shall be the maximum rated load at 30 km/h, in accordance with ISO 4251-2, ISO 7867-2 or ISO 8664. Tyre inflation pressure shall be the refere
30、nce inflation pressure that corresponds to the 30 km/h load. The tyre shall be inflated with air only. 5.4 Tyre measurement The overall diameter of each tyre shall be measured after being inflated for 24 h at ambient temperature with no applied load and the inflation pressure specified in 5.3. Infla
31、tion pressure shall be checked and adjusted, if necessary, immediately prior to measurement. 1) To be published. (Revision of ISO 4251-1:1992) 2) To be published. (Revision of ISO 4251-2:1992) Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:11:18 GMT+00:00 20
32、06, Uncontrolled Copy, (c) BSI BS AU 50-1.4.8:1998 2 BSI 04-1999 5.5 Test course The test course for the distance specified in clause 6 shall be a level, straight section of flat, dry road surface (asphalt or concrete). 5.6 Weather conditions The ambient air temperature for measuring, warm-up, and t
33、est shall be between 5 C and 30 C; however, an asphaltic surface shall be sufficiently cool that the surface is not tacky. The wind speed shall not exceed 15 km/h. 5.7 Test measurement Distance shall be determined by direct measurement or by tyre use of a calibrated fifth wheel. Each tyre on test sh
34、all be instrumented to return a minimum of eight impulses per revolution. 5.8 Test speed Tyres shall be tested at 10 km/h 2 km/h. 6 Method of test 6.1 Test preparation Immediately prior to testing, the inflation pressure of the loaded tyres shall be adjusted to the inflation pressure specified in 5.
35、3 at the ambient temperature. Tyres shall be run for 30 min at 25 km/h 5 km/h or until inflation pressure stabilizes (warm-up). The inflation pressure shall not be readjusted afterwards. 6.2 Test procedure Immediately after the test preparation, run the test at the speed specified in 5.8 to achieve
36、a minimum of 1 000 impulses over a test course of 100 m minimum while recording the number of impulses for the right wheel and the left wheel separately. During the test run, a differential lock shall not be engaged, acceleration and braking shall be avoided and steering input should be kept to mini
37、mum. Two runs shall be made in each direction of travel on the test course. Repeat this procedure if the number of impulses recorded on any run differs from the others by more than 0,2 %. In the event of stoppage or interruption of the test, repeat the whole test. 7 Expression of results The tyre ro
38、lling circumference is calculated by averaging the impulses recorded for the eight observations per test (4 runs 2 tyres) and then using the following formula: where: 8 Test report The test report shall include the following information: a) a reference to this International Standard; b) the identifi
39、cation of the tested tyre; c) the rim width (code); d) the tyre overall diameter (mm); e) the tyre load (kg); f) the inflation pressure (kPa); g) the ambient air temperature (C); h) the test speed (km/h); i) the test distance (m); j) the test result (rolling circumference in mm); k) the date of the
40、test (year-month-day). 9 Other test conditions If desired and agreed upon among the interested parties, rolling circumference under other conditions may be determined by following the above method of test. The test report must clearly indicate that results were obtained under non-standard conditions
41、 which shall be defined. RC = rolling circumference, in millimetres; S= test course length, in metres; ipr = number of impulses per tyre revolution; I= average number of impulses recorded per test. RC 1000Sipr I -= Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09
42、 02:11:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1.4.8:1998 BSI 04-1999 Annex A (informative) Bibliography ISO 4251-3:1994, Tyres (ply rating marked series) and rims for agricultural tractors and machines Part 3: Rims. Licensed Copy: London South Bank University, London South Bank Unive
43、rsity, Sat Dec 09 02:11:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-1.4.8:1998 ISO 11795: 1997 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards
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