GB/T 29042-2020 (GB/T29042-2020, GBT 29042-2020, GBT29042-2020) & related versions
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Thresholds and grading of rolling resistance for motor vehicle tyres
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| GB/T 29042-2012 | English | 160 |
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Thresholds of rolling resistance for motor vehicle tyres
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GB/T 29042-2020: PDF in English (GBT 29042-2020)
GB/T 29042-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.160.10
G 41
Replacing GB/T 29042-2012
Thresholds and grading of rolling resistance for motor
vehicle tyres
ISSUED ON: DECEMBER 14, 2020
IMPLEMENTED ON: NOVEMBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions... 5
4 Thresholds and grading requirements of rolling resistance coefficient ... 6
5 Test methods ... 7
Appendix A (Normative) Establishment of the tyre rolling resistance test benchmark
laboratory ... 8
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 29042-2012 “Thresholds of rolling resistance for motor
vehicle tyres”; compared with GB/T 29042-2012, the main technical changes, except
editorial changes, are as follows:
-- Adjust the thresholds of rolling resistance coefficient for tyres (see 4.1; Chapter 4
of version 2012);
-- Add the requirements for grading of rolling resistance coefficient for tyres (see
4.2);
-- Add thresholds and grading cut-off values of rolling resistance coefficient for tyres
during consistency check (see 4.3);
-- Add determination for the grading cut-off values of the rolling resistance
coefficient for tyres (see 4.4.2);
-- Delete the inspection rules (see Chapter 6 of version 2012);
-- Delete the tyre rolling resistance drum tester (dynamometric method) calibration
specification (see Appendix A of version 2012).
This Standard was proposed by China Petroleum and Chemical Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee on Tyres
and Rims of Standardization Administration of China (SAC/TC 19).
The drafting organizations of this Standard: Beijing Research and Design Institute of
Rubber Industry Co., Ltd., Shandong Linglong Tyre Co., Ltd., Triangle Tyre Co. Ltd.,
Sailun Group Co., ltd., Giti Radial Tire (Anhui) Company Ltd., Zhongce Rubber Group
Co., Ltd., Doublestar Group Co., Ltd., Double Coin Holdings Group Shanghai Tyre
Research Institute Co, LTD, Aeolus Tyre Co., Ltd., Wanli Tire Corporation Limited,
Chaoyang Longmarch Tyre Co., Ltd., Qingdao Sentury Tire Company Limited, Sichuan
Tyre And Rubber Co., Ltd., Xiamen Zhengxin Rubber Industry Co., Ltd., Guizhou Tyre
Co., Ltd., Prinx Chengshan (Shandong) Tire Company Ltd., Jiangsu General Science
Technology Co., Ltd., Shandong Huasheng Rubber Co., Ltd., Shandong Jinyu Tyre Co.,
Ltd, Shandong Xinghongyuan Tyre Co., Ltd., China Quality Certification Center,
Bridgestone (China) Investment Co., Ltd., Continental Tires (China) Co., Ltd.,
Michelin (China) Investment Co., Ltd., Dalian Goodyear Tire Co., Ltd., SUMITOMO
Rubber (China) Co., Ltd., YOKOHAMA Rubber (China) Co., Ltd., Hankook Tire Co.,
Ltd., Shantou Haoda Tires Testing Equipment Co., Ltd., SAIC-GM-Wuling Automobile.
The drafters of this Standard: Wang Kexian, Xu Lihong, Chen Shaomei, Hou Jingbin,
Cheng Hongfang, Zha Lei, Chai Delong, Wang Jun, Li Bowei, Liu Yuwan, Luo Jiliang,
Thresholds and grading of rolling resistance for motor
vehicle tyres
1 Scope
This Standard specifies terms and definitions for thresholds and grading of rolling
resistance for motor vehicle tyres, requirements and test methods for thresholds and
grading of rolling resistance coefficient.
This Standard applies to new radial tyres for passenger cars and new radial tyres for
miniature and light trucks and new radial tyres for trucks. However, it does not include:
tyres whose nominal diameter of rims is not greater than 10 inches and nominal
diameter of rims is not less than 25 inches; T-type spare tyres for temporary use only;
ST metric tyres for road-type trailers, and radial tyres with high throughput for light
trucks; truck tyres with a speed capacity of less than 80 km/h (excluding); racing tyres,
studded tyres and special off-road tyres.
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.
GB/T 6326, Tyre terms and definitions
GB/T 8170, Rules of rounding off for numerical values & expression and judgment
of limiting values
GB/T 29040, Test methods of rolling resistance for motor vehicle tyres - Single point
test and correlation of measurement results
3 Terms and definitions
Terms and definitions determined by GB/T 6326 and GB/T 29040, as well as the
following ones, are applicable to this document.
3.1
professional off-road tyre
Tyres primarily designed for use in harsh off-road conditions. For passenger car tyres
and miniature and light truck tyres with a single tyre load index of not more than 121
and a speed class of N and above, the groove depth of the pattern is not less than 11
Appendix A
(Normative)
Establishment of the tyre rolling resistance test benchmark laboratory
A.1 Basic requirements
A.1.1 The technical conditions and equipment requirements of the comparison
laboratory shall comply with the provisions of GB/T 29040.
A.1.2 The comparison laboratory shall monitor the equipment with control tyres for no
less than 3 times a month in accordance with the provisions of GB/T 29040 to ensure
that the test equipment meets the requirements.
A.1.3 The comparison laboratory shall pass the accreditation of the corresponding
national laboratory and obtain the nationally recognized qualification certificate.
A.2 Establishment of the benchmark laboratory
A.2.1 The benchmark laboratory is established based on the test data of multiple
comparison laboratories. Two benchmark laboratories shall be established, respectively
for:
a) Test of rolling resistance of passenger car tyres and miniature and light truck tyres
with a single tyre load index not greater than 121;
b) Test of rolling resistance of miniature and light truck tyres with a single tyre load
index greater than 121 and truck tyres.
A.2.2 The relevant departments (third parties) shall be responsible for the establishment
of the benchmark laboratory, and uniformly stipulate the quantity, requirements and
serial number of the laboratory and confirm every two years.
A.2.3 The establishment unit of the benchmark laboratory is responsible for
establishing the correlation between the benchmark laboratory and each comparison
laboratory, and gives a correlation coefficient for each comparison laboratory, and
publish the correlation coefficient every two years.
A.2.4 A set of calibration tyres shall be used for the establishment of each benchmark
laboratory; each set of calibration tyres shall be at least 5 tyres of different specifications.
These tyres shall meet the following requirements:
a) The difference between the maximum value and the minimum value of the rolling
resistance coefficient:
......
| Standard ID | GB/T 29042-2020 (GB/T29042-2020) | | Description (Translated English) | Thresholds and grading of rolling resistance for motor vehicle tyres | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G41 | | Classification of International Standard | 83.160.10 | | Word Count Estimation | 7,773 | | Date of Issue | 2020-12-14 | | Date of Implementation | 2021-11-01 | | Older Standard (superseded by this standard) | GB/T 29042-2012 | | Quoted Standard | GB/T 6326; GB/T 8170; GB/T 29040 | | Drafting Organization | Beijing Rubber Industry Research and Design Institute Co., Ltd. | | Administrative Organization | National Tire and Rim Standardization Technical Committee Automobile Industry and Agricultural Machinery Tire and Rim Branch | | Regulation (derived from) | National Standard Announcement No. 28 of 2020 | | Proposing organization | China Petroleum and Chemical Industry Federation | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | | Summary | This standard specifies the terms and definitions for the limits and grades of the rolling resistance of automobile tires, the limits and grade requirements and test methods for the coefficients of rolling resistance. This standard is applicable to new radial car tires and new miniature and light truck radial tires and new truck radial tires. But it does not include: tires with a nominal wheel diameter of not more than 10 inches and a nominal rim diameter of not less than 25 inches; T-type spare tires for temporary use only; special ST metric tires for road trailers, and high-passing radial tires for light trucks ; Truck tires, racing tires, studded tires and special off-road tires with a speed capability of 80 km/h (not included). |
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