GB/T Translated English of Chinese Standard: GB/T

Transcription

1 Translated English of Chinese Standard: GB/T GB ICS G 41 GB/T Replacing GB/T Laboratory Test Methods for Truck and Bus Tyres Capabilities 载重汽车轮胎性能室内试验方法 (ISO 10454:1993, Truck and bus tyres - Verifying tyre capabilities - Laboratory test methods, MOD) Issued on: June 14, 2016 Implemented on: May 1, 2017 Jointly Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People's Republic of China. Page 1 of 22

2 Table of Contents Foreword Scope Normative References Terms and Definitions Test Equipment and Precision Requirements Test Method Judgment Rules Test Report Appendix A (Informative) Comparison of Chapter and Article Numbers between This Standard and ISO 10454: Appendix B (Informative) Technical Differences between This Standard and ISO 10454:1993 and Their Reasons Appendix C (Normative) Corresponding Relationship between Tyre Speed Symbol and Speed Page 2 of 22

3 Foreword This Standard is drafted according to the rules given in GB/T This Standard replaces GB/T "Endurance test for truck and bus tyres - Drum method". Compared with GB/T , main technical changes of this Standard are as follows: - MODIFY the expression of normative references (see Chapter 2 of this edition; Chapter 2 of 2008 edition); - MODIFY the description of plunger material of strength tester, from metal to steel (see of this edition; of 2008 edition); - MODIFY the precision of filling pressure gauge, from precision is ± 20 kpa to precision is ± 10 kpa (see 4.3 of this edition; 4.3 of 2008 edition); - MODIFY the plunger diameter for strength test of truck and bus tyres (see Table 2 of this edition; Table 2 of 2008 edition); - MODIFY the requirements for the test rim (see , and of this edition; , and of 2008 edition); - ADD the endurance test conditions of radial tyres with the maximum load rating of a single tyre > 1500 kg and the speed symbol of N and P, and diagonal tyres with the maximum load rating of a single tyre > 1500 kg and the speed symbol of L (see Table 3 of this edition; Table 3 of 2008 edition); - MODIFY Note 2 of Endurance Test Conditions of Truck and Bus Tyres (Table 3), FROM It is for the tyres of which the nominal section width is and maximum speed is 70 km/h. Test drum speed shall be 30 km/h for test. TO For tyres with the maximum load rating of a single tyre > 1500 kg, and the maximum speed is 70 km/h, test drum speed shall be 30 km/h for test. (see Table 3 of this edition; Table 3 of 2008 edition); - ADD Note 3 of Endurance Test Conditions of Truck and Bus Tyres (Table 3), For radial tyres with the maximum load rating a single tyre > 1500 kg, and the maximum speed is 160 km/h, test drum speed shall be 110 km/h for test. (see Table 3 of this edition; Table 3 of 2008 edition); - DELETE the content of measuring the main dimensions of tyres after staying in endurance test (see of 2008 edition); - MODIFY the inspection procedure after the completion of endurance test (see of this edition; of 2008 edition); Page 3 of 22

4 For the convenience of use, the following editorial changes are made in this Standard: a) MODIFY the standard name; b) DELETE the Bibliography of the international standard. This Standard was proposed by China Petroleum and Chemical Industry Association. This Standard shall be under the jurisdiction of the National Technical Committee 19 on Tyre and Rim of Standardization Administration of China (SAC/TC 19). Main drafting organizations of this Standard: Aeolus Tyre Co., Ltd., Longmarch Tyre Co., Ltd., Shandong Linglong Tire Co., Ltd., Zhongce Rubber Group Co., Ltd., Beijing Research & Design Institute of Rubber Industry, Double Star Group Co., Ltd., Triangle Tyre Co., Ltd., Guizhou Tyre Co., Ltd., Guangzhou Wanli Rubber Tyre Co., Ltd., Double Coin Co., Ltd., Sailun Jinyu Group Co., Ltd., Xia men Cheng Shin Rubber Industry Co., Ltd., Guangzhou Fengli Rubber Tyre Co., Ltd., Qingdao Senqilin Tyre Co., Ltd., Bridgestone (China) Investment Co., Ltd., Dalian Goodyear Tyre Co., Ltd., Michelin (China) Investment Co., Ltd., Continental Tires (China) Co., Ltd., Shantou Haoda Tyre Test Equipment Co., Ltd., Tianjin Jiurong Wheel Technology Co., Ltd. Main drafters of this Standard: Ren Shaowen, Feng Yaoling, Bai Tao, Chen Shaomei, Mao Jianqing, Wang Kexian, Xu Lihong, Qi Shunqing, Zhou Pengcheng, Hu Xiangqi, Li Qinzhu, Li Bowei, Xu Hui, Chen Jianming, Peng Jinyu, Sheng Baoxin, Fu Guangping, Yin Qingye, Lu Yi, Ma Zhong, Chen Xun, Gu Zheng, Mou Shouyong. The previous editions replaced by this Standard are as follow: - GB/T , GB/T , GB/T ; - GB/T , GB/T ; - GB/T , GB/T Page 5 of 22

5 Laboratory Test Methods for Truck and Bus Tyres Capabilities 1 Scope This Standard specifies test methods for verifying the capabilities of tyres for truck and bus, including terms and definitions, test equipment and precision, test conditions, test procedure, judgment criterion and test report, etc. In the test methods given, only some may be required depending on the type of tyre to be tested. This Standard includes: (1) Endurance test test the endurance capability of tyres by the travel distance under specified load and speed; (2) High speed test test the capability of the tyre according to its speed symbol; (3) Strength test test the capability of the tyre structure with respect to braking energy of tread cap. The test methods presented in this Standard are suitable for grading of tyre capabilities or quality levels. This Standard is applicable to new pneumatic tyres of truck and bus. 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 2977 Size designation, dimensions, inflation pressure and load capacity for truck tyres GB/T 6326 Tyre terms and definitions (GB/T , ISO :2002, Definitions of some terms used in tyre industry - Part 1: Pneumatic tyres, NEQ) GB 9744 Truck tyres Page 6 of 22

6 conditions of both single tire and twin tires are specified, take the maximum load rating of single tire as final) Maintain the tyre and rim assembly at ambient temperature of 38 C ± 3 C for at least 3 h The test drum shall be started at uniform acceleration to the initial test speed within 5 min Endurance test conditions of tyres at each speed rating shall meet those specified in Table Test procedure Re-adjust the tyre pressure to the value specified in Mount the tyre and rim assembly on a test axle so that the tyre may be pressed radially against the outer face of the test drum During the test, the ambient temperature shall be maintained at 38 C ± 3 C Conduct the test in accordance with those specified in Table 3. Conduct test according to specified procedure. In each successive phase of the test, without interruption, re-adjust the pneumatic pressure and cool down tyre artificially, and the test loads shall be maintained constant After test is completed according to the specified procedures, cool the test tyre down naturally for 15 min ~ 25 min, measure the pneumatic pressure during this specified duration. Dismantle the tyre after complete cooling. Carry out appearance inspection. Tyre speed symbol a Table 3 Endurance Test Conditions of Truck and Bus Tyres Test drum speed (km/h) Radial tyres Diagonal tyres Load as percentage of maximum load rating (%) Duration 7h (Period 1) 16h (Period 2) 24h (Period 3) a) Single tire with maximum load rating 1500 kg F G J K L Page 9 of 22

7 Re-adjust the tyre pressure to the pneumatic pressure specified in Mount the tyre and rim assembly on a tester Conduct test at 5 test points approximately equally spaced around the circumference of the tyre Position the plunger as near to the centreline as possible; avoid penetration into the tread grooves Force the plunger perpendicularly into the tread at a rate of 50 mm/min ± 2.5 mm/min until the tread is penetrated or achieving the minimum breaking energy specified in Table 5 and Table 6. Check the pressure before moving to the next test point Measure and record the force (F) and pressed depth (penetration P) at the moment of plunger stops moving at each test point If the tyre fails to be penetrated before the plunger is contacting the rim, the test point shall be deemed to pass the test, and indicate touch rim unseated in the test report Compute the breaking energy for each test point (except those considered by ) by means of the Formula (1). W = F P/2000 (1) Where: W the breaking energy, in joules (J); F the force, in newtons (N); P the penetration, in millimeters (mm) When an appropriate device which automatically evaluates the value of the energy is available, the penetration can be stopped shortly after having achieved the prescribed minimum breaking energy In the test process, if the tubeless tyres are unable to keep charging pressure, they may be equipped with inner tubes to carry out test. However, this case shall be indicated in the test report. Page 12 of 22

8 Appendix A (Informative) Comparison of Chapter and Article Numbers between This Standard and ISO 10454:1993 Table A.1 lists out the comparison list of chapter and article numbers between this Standard and ISO 10454:1993 (English edition). Table A.1 Comparison of Chapter and Article Numbers between this Standard and ISO 10454:1993 Chapter and article numbers of this Standard Chapter and article numbers of ISO 10454:1993 Chapter and article numbers of this Standard Chapter and article numbers of ISO 10454: ~ ~ ~ , , ~ Table 1 Table Table a) 6.3.1, Table 5 Table ~ Table 6 Page 16 of 22

9 Appendix B (Informative) Technical Differences between This Standard and ISO 10454:1993 and Their Reasons Table B.1 lists out the comparison of technical differences between this Standard and ISO 10454:1993 (English edition) and their reasons. Table B.1 Technical Differences between This Standard and ISO 10454:1993 and Their Reasons Chapter and Article numbers Technical differences Reasons of this Standard 1 Different scope of this Standard ISO specifies 2 laboratory test methods for truck and bus tires capabilities, while this Standard specifies 3 test methods GB/T 6326, GB/T 2977 and GB 9744 were quoted directly, and ISO quoted in ISO was deleted The majority of specific provisions of the international standard were deleted, only one key term was reserved, and another term was added Only one of two test drum diameters specified in ISO Although GB/T 6326 is not equivalent to ISO , it covers 410 terms in total and 52 of which are stemmed from the 58 terms of ISO Simultaneously, test methods are involved in test load, measuring rim and other requirements; according to the national conditions of China, GB/T 2977 and GB 9744 were added The majority of terms and definitions of ISO are already included in GB/T For the purpose of simplification, only 1 term is reserved The requirements of test drum diameter of 1700 mm ± 17 mm Page 18 of 22

10 Appendix C (Normative) Corresponding Relationship between Tyre Speed Symbol and Speed Table C.1 lists out the corresponding relationship between tyre speed symbol and speed. Table C.1 Corresponding Relationship between Tyre Speed Symbol and Speed Tyre speed symbol Maximum driving speed (km/h) C 60 D 65 E 70 F 80 G 90 J 100 K 110 L 120 M 130 N 140 P 150 Q 160 R 170 S 180 T 190 U 200 H 210 END Page 22 of 22