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GB/T 4502-2023: Laboratory test methods for passenger car tyres capabilities Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 4502: Historical versions
GB/T 4502-2023: Laboratory test methods for passenger car tyres capabilities---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT4502-2023GB NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA ICS 83.160.10 CCS G 41 Replacing GB/T 4502-2016 Laboratory test methods for passenger car tyres capabilities (ISO 10191.2021, Passenger car tyres - Verifying tyre capabilities - Laboratory test methods, MOD) Issued on. MAY 23, 2023 Implemented on. DECEMBER 1, 2023 Issued by. State Administration for Market Regulation; Standardization Administration of PRC. Table of ContentsForeword... 3 1 Scope... 7 2 Normative references... 7 3 Terms and definitions... 7 4 Test equipment and its precision... 8 5 Test samples... 9 6 Test methods... 10 7 Judgment rules... 18 8 Test report... 19 Appendix A (Informative) Comparison list of structure numbers between this document and ISO 10191.2021... 21 Appendix B (Informative) List of technical differences between this document and ISO 10191.2021 and their reasons... 23 Appendix C (normative) Shape and dimensions of the pressing block for bead unseating ... 26 Reference... 27ForewordThis document was drafted in accordance with the provisions of GB/T 1.1-2020 Directives for standardization - Part 1.Rules for the structure and drafting of standardizing documents. This document replaces GB/T 4502-2016 Laboratory test methods for passenger car tyres capabilities. Compared with GB/T 4502-2016, except for the structural adjustment and editorial revisions, the main technical changes are as follows. -- The scope of application is changed (see Chapter 1; see Chapter 1 of the 2016 edition); -- The term and definition of "test drum speed" is deleted (see 3.1 of the 2016 edition); -- The term and definition of "parasitic tread block chunking" is added (see 3.1); -- The type of standard pressing block for bead unseating that the testing machine shall be equipped with is changed (see 4.1.2; see 4.1.2 of the 2016 edition); -- The requirement that the accuracy of the P value indicator is ±1 mm is added (see 4.1.5); -- The regulation that the maximum range of the inflation pressure gauge shall be at least 500 kPa is deleted (see 4.4 of the 2016 edition); -- The instructions and requirements for the test samples are changed, and they constitute a separate chapter (see Chapter 5; see 6.1 of the 2016 edition); -- The content that appearance quality shall comply with the provisions of GB 9743 is deleted (see 5.1.1.1, 5.2.1.1, 5.3.1.1, and 5.4.1.1 of the 2016 edition); -- The regulations on test rims are changed (see 6.1.1.2, 6.2.1.1, 6.3.1.1, and 6.4.1.1; see 5.1.1.2, 5.2.1.2, 5.3.1.2, and 5.4.1.2 of the 2016 edition); -- The scope of use of different types of pressing blocks for bead unseating is changed (see 6.1.1.6; see 5.1.1.6 of the 2016 edition); -- The rounding rule of the H value related to the calculation of P value is changed (see Table 2; see Table 2 of the 2016 edition); -- The description of "If the same set of tyre and rim assembly used for the bead unseating resistance test is used, the test can be continued." is added (see 6.2.1.3); -- The provision of "If the device for automatically calculating the breaking energy is used, when the specified minimum breaking energy is reached, the indenter shall be immediately stopped pressing into the tyre." is added (see 6.2.2.8); -- The requirement that necessary means used to maintain the specified test pressure during the test shall be noted in the test report is added (see 6.2.2.9); -- The regulation that when the same sample is used for the second test of the passenger car tyre with a speed exceeding 300 km/h, it needs to be stood and the tyre pressure shall be readjusted is added (see 6.3.1.7); -- The requirement that "no bead unseating but slippage" is considered to pass the test is added to the judgment rule of the bead unseating resistance test (see 7.1); -- The provision of "If the rim is touched and the tyre isn't punctured, the tyre is judged to pass the test." is added to the judgment rule of the strength performance (see 7.2); -- The description of "Tyres with a maximum speed of 300 km/h and above may have bulges on the tread surface or chunking caused by bulging." is added to the judgment rule of the high-speed performance (see 7.3); -- The provision of "chunking (except PTBC of snow tyres)" is added to the judgment rules of the endurance test and low-pressure performance (see 7.4, 7.5); -- The provision of "slippage or the rim is touched" is added to the condition of each test point of the tyre in the test report of bead unseating resistance [see j) in Chapter 8]. This document is modified in relation to ISO 10191.2021 Passenger car tyres - Verifying tyre capabilities - Laboratory test methods. Compared with ISO 10191.2021, this document has more structural adjustments; the comparison list of structure numbers between the two documents is shown in Appendix A. Compared with ISO 10191.2021, this document has many technical differences, and the outer margin of the terms involved is marked with a vertical single line (|). See Appendix B for a list of these technical differences and their reasons. The following editorial changes have been made to this document. -- In order to coordinate with the existing standard, the name of the standard is changed to "Laboratory test methods for passenger car tyres capabilities"; -- The informative reference GB/T 2978 is added; -- Appendix A (informative) the comparison list of structure numbers between this document and ISO 10191.2021 is added; -- Appendix B (informative) the list of technical differences between this document and ISO 10191.2021 and their reasons is added; -- Appendix A (informative) of ISO 10191.2021 High-speed test - Test conditions for tyres without service description marking is deleted. Please note that some of the content of this document may involve patents. The issuing agency of this document is not responsible for identifying patents. This document was proposed by China Petroleum and Chemical Industry Federation. This document shall be under the jurisdiction of the National Technical Committee on Tyres and Rims of Standardization Administration of China (SAC/TC19). The previous versions of the documents replaced by this document are as follows. -- GB/T 4502 was first published in 1984 and first revised in 1998; -- When it was revised for the second time in 2009, GB/T 4503-2006 Test method of strength for passenger car tyres (the previous versions of GB/T 4503-2006 are as follows. it was first published in 1984, first revised in 1996 and secondly revised in 2006), GB/T 4504-1998 Bead unseating resistance test for tubeless passenger car tyres (the previous versions of GB/T 4504-1998 are as follows. it was first published in 1984 and first revised in 1998), and GB/T 7034-1998 High speed test for passenger car tyres - Drum method (the previous versions of GB/T7034-1998 are as follows. it was first published in 1986 and first revised in 1998) were incorporated; -- The third revision was in 2016; -- This is the fourth revision. Laboratory test methods for passenger car tyres capabilities1 ScopeThis document describes the laboratory test methods for performance testing of passenger car tyres, including test equipment and its precision, test conditions, test procedures, judgment rules and test reports.2 Normative referencesThe following documents contain the provisions which, through normative reference in this document, constitute the essential provisions of this document. For the dated referenced documents, only the versions with the indicated dates are applicable to this document; for the undated referenced documents, only the latest version (including all the amendments) is applicable to this document. GB/T6326 Tyre terms and definitions (GB/T 6326-2014, ISO 4223-1.2002, NEQ) GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values3 Terms and definitionsTerms and definitions defined in GB/T 6326 and the following apply to this document. 3.1 parasitic tread block chunking; PTBC A defect characterized by rubber pieces separated from the tyre tread or tearing without exposing the tyre reinforcing material (such as carcass ply, belt, etc.).4 Test equipment and its precisionThe testing machine shall be equipped with standard pressing blocks for bead unseating (A-type and C-type), and the size, shape and manufacturing materials shall comply with the provisions of Appendix C. The testing machine shall be equipped with a sufficiently long cylindrical metal indenter, and the end of the indenter is hemispherical with a diameter of 19 mm±0.5 mm.5 Test samplesAccording to the needs of the test, the test samples are 3 to 5 identical tyres, which are used for bead unseating resistance test and strength test, high-speed test, endurance test and low-pressure performance test respectively.6 Test methodsThe test tyres shall be tubeless passenger car tyres, and the bead parts shall be clean and dry before installation. The test rim should comply with the provisions of GB/T 2978 or relevant industry technical documents on measuring rims.7 Judgment rulesAfter the test is completed according to the requirements of 6.1, if the bead unseating resistance of each test point is not less than the specified value in Table 8, the sample is judged as "pass the test"; otherwise, it is judged as "fail the test"; the situation that the bead has not been unseated but the pressing block slips or touches the rim is deemed as "pass the test".8 Test reportThe test report shall include the following content. a) the manufacturer name, trademark, specification, and production number of the test tyre; b) the load index or ply rating, maximum load capacity, speed symbol, material, and structure of the test tyre, etc.; c) test rim specifications. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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