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GB/T 29040-2012 PDF in English


GB/T 29040-2012 (GB/T29040-2012, GBT 29040-2012, GBT29040-2012)
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GB/T 29040-2012: PDF in English (GBT 29040-2012)

GB/T 29040-2012
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.160.10
G 41
Test Methods of Rolling Resistance for Motor Vehicle Tyres -
Single Point Test and Correlation of Measurement Results
(ISO 28580:2009 Passenger Car, Truck and Bus Tyres - Methods of Measuring
Rolling Resistance - Single Point Test and Correlation of Measurement Results,
MOD)
ISSUED ON: DECEMBER 31, 2012
IMPLEMENTED ON: SEPTEMBER 1, 2013
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
Introduction ... 4
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 5
4 Test Methods ... 8
5 Test Equipment ... 9
6 Test Conditions ... 10
7 Test Procedure ... 11
8 Data Interpretation ... 14
9 Data Analysis ... 18
10 Measurement Machines Alignment and Monitoring Requirements ... 19
Appendix A (Informative) Comparison of Chapter and Article Numbers between This
Standard and ISO 28580:2009 ... 24
Appendix B (Informative) Technical Differences between This Standard and ISO
28580:2009 and Their Reasons ... 26
Appendix C (Normative) Test Equipment Tolerances ... 28
Appendix D (Informative) Measurement Methods of Moment of Inertia for Drum and
Tyre Assembly (Deceleration Method) ... 31
Bibliography ... 36
Foreword
This standard was drafted according to the rules specified in GB/T 1.1-2009.
This Standard is modified in relation to ISO 28580:2009 "Passenger Car, Truck and Bus Tyres
- Methods of Measuring Rolling Resistance - Single Point Test and Correlation of
Measurement Results".
There are some adjustments in the structure for this Standard which is compared with ISO
28580:2009; the comparison list of chapter and article numbers of this Standard and ISO
28580:2009 is given in Appendix A.
There are some technical differences between ISO 28580:2009 and this Standard, those
technical differences have already been incorporated into the text and marked with
perpendicular single line on the margin of relevant clauses. Appendix B gives a summary list
of these technical differences and their reasons for your reference.
To be convenient for use, the following editorial changes are also made in this Standard:
— Standard name was changed;
— Bibliography was deleted.
This national standard was proposed by China Petroleum and Chemical Industry Association.
This Standard is under the jurisdiction of National Technical Committee 19 on Tyres and
Rims of Standardization Administration of China (SAC/TC 19).
Chief drafting organizations of this Standard: Beijing Research & Design Institute of Rubber
Industry, Michelin (China) Investment Co., Ltd., Double Coin Holdings Ltd., Shandong
Linglong Tyre Co., Ltd., Inspection and Quarantine Center of Shandong Exit & Entry
Inspection and Quarantine Bureau, Triangle Tyre Co., Ltd., Sailun Co., Ltd., Hangzhou
Zhongce Rubber Co., Ltd., Bridgestone (China) Investment Co., Ltd., Qingdao Gaoxiao
Measurement & Control Technology Co., Ltd. and Sichuan Haida Rubber Group Co., Ltd.
Chief drafting staff of this Standard: Li Hongwei, Xu Lihong, Lu Yi, Li Bowei, Chen
Shaomei, Sheng Menglong, Qiao Lingling, Liu Aiqin, Zhang Jianjun, Fu Guangping, Qin
Juncun, Yang Qi and Zheng Guangliang.
Test Methods of Rolling Resistance for Motor Vehicle Tyres -
Single Point Test and Correlation of Measurement Results
1 Scope
This Standard specifies methods for measuring rolling resistance, under controlled laboratory
conditions, for new pneumatic tyres designed primarily for use on passenger cars, and trucks.
This Standard is applicable to the new pneumatic tyres designed primarily for use on
passenger cars, trucks and motorcycles. Tyres intended for temporary use only are not
included in this Standard.
2 Normative References
The following document is essential for the application of this Standard. For dated references,
only the edition cited applies. For undated references, the latest edition (including any
amendments) is applicable to this document.
GB/T 2977 Size Designation, Dimensions Inflation Pressure and Load Capacity for truck
tyres
GB/T 2978 Size Designation, Dimensions Inflation Pressure and Load Capacity for
Passenger Car Tyres
GB/T 6326 Tyre Terms and Definitions (GB/T 6326-2005, ISO 4223-1:2002, Definitions
of Some Terms Used in Tyre Industry - Part 1: Pneumatic Tyres, NEQ)
ISO/IEC 17025 General Requirements for the Competence of Testing and Calibration
Laboratories
ISO/TS 16949 Quality Management Systems - Particular Requirements for the
Application of ISO 9001: 2008 for Automotive Production and Relevant Service Part
Organizations
3 Terms and Definitions
For the purpose of this Standard, the terms and definitions defined in GB/T 6326 apply.
3.1 Rolling resistance Fr
described in ISO 18164, SAE J1269 and SAE J2452.
Note 2: It is permissible to repeat an accepted test procedure.
3.8 Measurement result correlation
Set of rolling resistance measurements to be carried out on a regular time basis by separate
laboratories, in order to allow direct comparisons between their rolling resistance results.
Note: The results of these measurements are used to compute “alignment” corrective coefficients
and permit calculation of aligned rolling resistance measurement (see Clause 10).
3.9 Compare laboratory
Laboratory that participates in the establishment of reference laboratory and execute
alignment procedure.
3.10 Reference laboratory
A virtual laboratory that is established on the base of test data of compare laboratory. Take
specified quantity of tyres which required to be aligned; carry out rolling resistance
measurement by multiple approved compare laboratories in accordance with relevant
requirements; and take the average value of test results as the test results of the virtual
laboratory.
3.11 Candidate laboratory
Non-compare-laboratory that participates in alignment procedure.
3.12 Alignment tyre
A test tyre that is used to execute the alignment procedure.
3.13 Alignment tyres set
A set of five or more alignment tyres.
3.14 Laboratory control tyre
Tyre used by an individual laboratory to control machine behaviour as a function of time.
Note: An example of machine behaviour is drift.
3.15 Measurement reproducibility σm
Capability of a machine to measure rolling resistance.
Note: σm can be obtained by measuring a set of tyres for n times (n≥3), as the complete procedure
described in Clause 7. For a set of p(p≥5) tyres, it assumes that the variances of the set of p tyres are
10.2.1 Alignment tyres shall be a set of tyres, at least 5, of different sizes.
10.2.2 For the predetermined alignment tyres used to conduct the alignment procedure,
the load index (LI), Cr and Fr, shall satisfy the requirements as follows:
a) the different value between Cr maximum and minimum
— passenger car and smaller truck and bus tyres (LI ≤ 121): ≥ 3 N/kN;
— smaller truck and bus tyres (LI > 121) and larger truck and bus tyres: ≥ 2 N/kN
b) Cr value shall be evenly distributed, and the interval range is as follows:
— for passenger car and smaller truck and bus tyres (LI ≤ 121), it is (1.0±0.5) N/kN;
— for smaller truck and bus tyres (LI > 121) and larger truck and bus tyres, it is
(1.0±0.5) N/kN.
c) section width of alignment tyres
— passenger car and smaller truck and bus tyres (LI ≤ 121): ≤ 245 mm;
— smaller truck and bus tyres (LI > 121) and larger truck and bus tyres: ≤ 385 mm.
d) outer diameter of alignment tyres
— for passenger car and smaller truck and bus tyres (LI ≤ 121), it is between 510 mm
and 800 mm;
— for smaller truck and bus tyres (LI > 121) and larger truck and bus tyres, it is
between 771 mm and 1143 mm.
e) load index values shall adequately cover the range for the tyres to be tested, ensuring
that the Fr values can also cover the range for the tyres to be tested.
10.2.3 Each alignment tyre shall be checked prior to use and replaced when:
a) it shows a condition that makes it unusable for further tests;
b) there are deviations of Cr for alignment tyre measurement greater than 1.5 % relative to
earlier measurements after correction for any machine drift.
10.3 Alignment procedure
10.3.1 Each time an alignment tyre is measured, the tyre/wheel assembly shall be removed
from the machine and the entire test procedure specified in Clause 7 shall be followed again.
This requirement applies to both the compare laboratory and the candidate laboratory.
10.3.2 Compare laboratory shall measure each alignment tyre three times in accordance
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.