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GB/T 4502-2016 English PDF (GBT4502-2016)

GB/T 4502-2016 English PDF (GBT4502-2016)

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GB/T 4502-2016: Laboratory test methods for passenger car tyres capabilities

This Standard specifies laboratory test methods for verifying the capabilities of tyres for passenger cars, including terms and definitions used in the tests, testing equipment and precision, test conditions, testing procedures, judgment criteria, and test reports. Of the test methods presented, it is possible that only some will be required, depending on the type of tyre to be tested (tube or tubeless, diagonal or radial).
GB/T 4502-2016
GB
NATIONAL STANDARD OF
THE PEOPLE REPUBLIC OF CHINA
ICS 83.160.10
G 41
Replacing GB/T 4502-2009
Laboratory test methods for
passenger car tyres capabilities
(ISO 10191.2010, Passenger car tyres - Verifying tyre capability
- Laboratory test methods, MOD)
ISSUED ON. AUGUST 29, 2016
IMPLEMENTED ON. JULY 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 7
4 Test equipment and precision ... 7
5 Test methods ... 9
6 Determination criterion ... 17
7 Test report ... 19
Annex A (Informative) Comparison between clause numbers of this Standard and ISO 10191. 2010 ... 21
Annex B (Informative) Technical differences between this Standard and ISO 10191.2010 and causes for these differences ... 24
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 4502-2009 Laboratory Test Methods for
Passenger Car Tyres Capabilities. Compared with GB/T 4502-2009, the main technical changes are as follows.
- modified and added definitions of test drum speed and test speed (see 3.1, 3.2 of this Edition [Translator note. in the text, there is no 3.2; test drum speed and test speed are all in 3.1], 3.1 of Edition 2009);
- modified requirements for accuracy of inflation pressure gauges which was modified to ?€???5 kPa?€? (see 4.4 of this Edition, 4.4 of Edition 2009); - modified the provisions for distance P from bead unseating block of which P value shall be determined by requirements in Table 2 (see Table 2 of
this Edition, Table 2 of Edition 2009);
- added and modified relevant content of ?€?Type C bead unseating block
shall be used for other tubeless passenger car tyres with rims of nominal diameters ranging 10~19 and the aspect ratio less than or equal to 30.?€? (see 5.1.1.6 of this Edition, 5.1.1.6 of Edition 2009);
- modified ?€?Apply a force through the block to the tyre outer at a rate of 50 mm/min ?? 2.5 mm/min, and increase the force until the bead block seats
or until the minimum bead unseating resistance prescribed in Table 7 is reached?€? to ?€?The bead unseating block shall apply to the tyre outer at a rate of 50 mm/min ?? 2.5 mm/min to increase the applied force until the
minimum bead unseating resistance specified in Table 8 is reached and
the final test point shall continue until it is unseating or contact with the rim. Correct the air pressure before proceeding to the next point.?€? (see 5.1.2.4 of this Edition, 5.1.2.4 of Edition 2009);
- added requirements of ?€?It should be noted if there is block slippage or pressure to the rim?€? (see 5.1.2.5 of this Edition);
- added test conditions and test procedures in high speed test for
passenger car tyres with a maximum speed exceeding 300 km/h (see
5.3.1.7, 5.3.1.8, 5.3.2.4, Table 6 of this Edition);
- added special requirements for test speed of 110 km/h in snow tyre?€?s
endurance test, low-pressure performance test (see 5.4.1.6, 5.5.1.3 of this Edition);
For easy use, this Standard also makes the following editorial modification. - deleted Bibliography in the International standard.
This Standard was proposed by China Petroleum and Chemical Industry
Federation.
This Standard shall be under the jurisdiction of National Technical Committee on Tyre and Rim of Standardization Administration of China (SAC/TC 19). The drafting organizations of this Standard. Guangzhou South China Rubber Tyre Co., Ltd., Triangle Tyre Co., Ltd., Zhongce Rubber Group Co., Ltd., Shandong Linglong Tyre Co., Ltd., Beijing Rubber Industry Research and
Design Institute, Xiamen Cheng Shin Rubber Ind. Co., Ltd., Sai Lun Jinyu Group Co., Ltd., Double Star Group Limited Liability Company, Aeolus Tyre Co., Ltd., Guangzhou Fengli Rubber Tyre Co., Ltd., Qingdao Senqilin Tyre Co., Ltd., Michelin (China) Investment Co., Tongyi Tyres Zhangjiagang Co., Ltd.,
Bridgestone (China) Investment Co., Dalian Goodyear Tyre Co., Ltd.,
Continental Brand tyres (China) Co., Ltd., Tianjin Jiurong Wheel Technology Co., Ltd., Shantou Huge Tyre Testing Equipment Co., Ltd..
Main drafters of this Standard. Xie Peng, Deng Shitao, He Haoming, Chen Shaomei, Xu Lihong, Wang Kexian, Chen Jianming, Xiao Shenglong, Zhu
Xinjing, Zhang Yong, Ren Shaowen, Zhou Qiong, Sheng Baoxin, Lu Yi, Zhu
Bangneng, Fu Guangping, Yin Qingye, Ma Zhong, Gu Zheng, Chen Xun, Mou
Shouyong.
Versions of standard substituted by this Standard are.
- GB/T 4502-1984, GB/T 4502-1998, GB/T 4502-2009;
- GB/T 4503-1984, GB/T 4503-1996, GB/T 4503-2006;
- GB/T 4504-1984, GB/T 4504-1998;
- GB/T 7034-1986, GB/T 7034-1998.
Laboratory test methods for
passenger car tyres capabilities
1 Scope
This Standard specifies laboratory test methods for verifying the capabilities of tyres for passenger cars, including terms and definitions used in the tests, testing equipment and precision, test conditions, testing procedures, judgment criteria, and test reports. Of the test methods presented, it is possible that only some will be required, depending on the type of tyre to be tested (tube or tubeless, diagonal or radial).
This Standard includes.
(1) Bead unseating test. assesses the resistance of the tubeless tyre to bead unseating.
(2) Strength test. assesses the capability of the tyre structure, with respect to braking energy, in the tread area.
(3) High speed test. assesses the capability of the tyre according to its speed category.
(4) Endurance test. assesses the resistance of the type, with respect to service at specified load and speed.
(5) Low-pressure performance test. assesses reliability of radial tyres under low pressure, with respect to service at specified load, speed, and low pressure conditions.
The test methods presented in this Standard are not intended for gradation of tyre performance or quality levels.
This Standard applies to all pneumatic-tyres for passenger cars.
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 2978-2008 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-l. 2002, NEQ)
GB 9743 Passenger car tyres
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 6326 and the following apply.
3.1 test drum speed
test speed
peripheral linear speed of the test drum surface during its rotation
4 Test equipment and precision
4.1 Bead unseating testing machine
4.1.1 The basic structure and main positions and dimensions of the testing machine are shown in Figure 1.
4.1.2 The testing machine shall be provided with a standard bead unseating block (Type A, Type B, and Type C) of the dimensions, shape, and
manufacturing material, as shown in Figure 2.
4.1.3 The bead unseating block loading device shall permit progressive
application of the force. Indicators of displacement and force provided shall be accurate to within ?? 1 % of full scale.
4.1.4 The displacement speed of the bead unseating block shall be controlled with an accuracy within ?? 3 % of the full scale.
4.2 Strength testing machine
4.2.1 The testing machine shall be provided with a cylindrical metal plunger of sufficient length with a hemispherical end and a diameter of 19 ?? 0.5 mm. 4.2.2 For the plunger equipment, the loading device shall permit gradual application of the force. Indicators of displacement and force provided shall be accurate to within ??1% of full scale.
4.2.3 The displacement speed of the plunger shall be controlled with an If the given P value is greater than D/2 or slip and other specifications not included calculated in the following formula.
Calculation
where,
D - Tyre?€?s new tyre design outside diameter;
D1 - Nominal diameter of rim;
H - Tyre section height, , rounding to the millimeter integer.
5.1.2 Test procedure
5.1.2.1 Readjust the pressure of the rested test tyre to the value specified in Table 1.
5.1.2.2 Mount the tyre and rim assembly to the bead unseating testing
machine shown in Figure 1 and test the assembly point by point.
5.1.2.3 Position the bead unseating block against the tyre at a horizontal distance, P, as given in 5.1.1.6.
5.1.2.4 The bead unseating block shall apply to the tyre outer at a rate of 50 mm/min ?? 2.5 mm/min to increase the applied force until the minimum bead unseating resistance specified in Table 8 is reached and the final test point shall continue until it is unseating or contact with the rim. Correct...

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