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GB/T 34007-2017: Road vehicles - Brake lining friction materials - Drag test method for friction performance Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 34007-2017: Road vehicles - Brake lining friction materials - Drag test method for friction performance---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/GBT34007-2017 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 43.040.40 Q 69 Road vehicles - Brake lining friction materials - Drag test method for friction performance Issued on. JULY 12, 2017 Implemented on. JUNE 01, 2018 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of PRC. Table of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Terms and definitions... 4 4 Test equipment... 5 5 Test type and test device... 6 6 Test procedures... 7 7 Report of results... 13ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by the China Building Materials Federation. This standard shall be under the jurisdiction of the National Non-metallic Mineral Products and Products Standardization Technical Committee (SAC/TC 406). Drafting organizations of this standard. Dongying Baofeng Auto Parts Co., Ltd., Jinan Jinqilin Brake System Co., Ltd., Taimington Friction Material Technology (Shanghai) Co., Ltd., Fujian Huari Auto Parts Co., Ltd., Xiamen Lixingda Friction Material Co., Ltd., Chongqing Hongyu Friction Products Co., Ltd., Shandong Liangshan Shenli Auto Parts Co., Ltd., Ningguo Feiying Auto Parts Co., Ltd., Tonglu Yuxin Auto Parts Co., Ltd., Xianyang Non-Metallic Mineral Research and Design Institute Co., Ltd., National Non-metallic Mineral Products Quality Supervision Inspection center. The main drafters of this standard. Chen Kewen, Tian Shiguo, Sun Peng, Zhen Minghui, Zhang Jianli, Su Meizhen, Yang Lijun, Ye Jialing, Zhao Yong, Feng Jingyou, Sun Qichun, Wang Xiaopeng, Shi Zhigang. Road vehicles - Brake lining friction materials - Drag test method for friction performance1 ScopeThis standard specifies the test equipment, test type, test device, test procedure, result report of the friction performance test of the brake lining materials of road vehicles using the drag test method. This standard applies to the friction performance test of brake linings (hereinafter referred to as linings) used in category M, N, O, L vehicles.2 Normative referencesThe following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard. GB/T 5620 Road vehicles - Braking of automotive vehicles and their trailers - Vocabulary (GB/T 5620-2002, idt ISO 611.1994) GB/T 15089 Classification of power-driven vehicles and trailers JB/T 7498 Coated abrasives - Abrasive paper QC/T 556 Automotive brake - Temperature measurement and thermocouple installation3 Terms and definitionsThe terms and definitions defined in GB/T 5620 and GB/T 15089 AND the following terms and definitions apply to this document. 3.1 Braking cycle A braking process which consists of several braking runs, each braking operation consisting of 5 s braking and 10 s idling. 3.2 Constant pressure mode The control method in which the pipeline pressure remains constant during braking. 3.3 Constant torque mode The control method in which the braking torque remains constant during braking. 3.4 Initial brake rotor temperature The temperature of the brake disc at the beginning of the first brake run of each braking cycle. 3.5 Maximum brake rotor temperature The temperature exceeded by the brake disc is not allowed during each braking cycle.4 Test equipment4.1 The test equipment shall be capable of performing pre-set test procedures and achieving automatic control. 4.2 The recording equipment shall be capable of continuously recording the following parameters, the measurement accuracy shall meet the following requirements. 4.3 The cooling during the test is air-cooled. The temperature of the cooling air does not exceed 25 °C and is blown to the brake at a flow rate of (600 ± 60) m3/h. 4.4 The speed of the equipment’s main shaft shall be (660 ± 10) r/min when idling, it shall be not less than 600 r/min at full load. 4.5 During the test, it should use the embedded thermocouple to measure the temperature of the brake disc. The installation and measurement shall be in accordance with QC/T 556. 4.6 The radial runout and axial runout of the brake disc during equipment operation shall not exceed 0.08 mm.5 Test type and test device5.1 Test type The test type is divided into the original sample test and the sampling method test. The original sample test is to test the specimen of original size, the sampling method test is to prepare the specimen into the sample block of the specified size to perform test. 5.2 Test device for disc linings for categories M1, M2, N1, O1, O2, L vehicles 5.2.1 When performing the original sample test, the brake disc and brake caliper used in the test shall be the brake disc and brake caliper according to the drawings and technical documents. 5.2.2 When performing the sampling test, it shall install a fixed-type disc brake caliper on the test machine, the piston diameter is 36 mm. The distance between the center of the sample block and the center of the brake disc after installation is 116.5 mm. 5.3 Test devices for disc linings and drum linings for categories M3, N2, N3, O3, O4 vehicles It shall install a fixed-type disc brake caliper on the test machine, which has a piston diameter of 60 mm. The distance between the center of the sample block and the center of the brake disc after installation is 108 mm.6 Test procedures6.1 Test procedure for disc linings for categories M1, M2, N1, O1, O2, L vehicles 6.1.1 Test preparation 6.1.1.1 Determination of test pressure and torque by original sample method 6.1.1.2 Determination of test pressure and torque by sampling method The pressure per unit area of the friction surface of the sample block under constant pressure mode is 75 N/cm2, the pressure of the brake pipeline is 0.89 MPa; 6.1.1.3 Treatment of the surface of brake disc Before each test, the surface of the brake disc shall be treated by the sandpaper which has a grain size of P240 or finer in JB/T 7498, so that the surface of the brake disc has no obvious wear marks and rust; use a soft cloth and absolute ethanol to remove the dust and oil stains from the surface of the brake disc. 6.1.1.4 Preparation of specimen 6.1.2 Run-in of the lining or sample block The lining or sample block shall be run-in before the formal test, until the contact area of the lining or sample block with the brake disc is not less than 80%. 6.1.3 Measurement of initial thickness and mass Take out the linings or sample block that have been run-in, measure and record the thickness of each measurement point of each lining or sample block, accurate to 0.01 mm; weigh and record the mass of each lining or sample block, accurate to 0.01 g. 6.1.4 Test procedure 6.1.4.1 Test procedure at constant pressure mode The test procedure at constant pressure mode is as shown in Table 1. 6.1.4.2 Test procedure at constant torque mode The test procedure at constant torque mode is as shown in Table 2. 6.1.5 Measurement of final thickness and mass Remove the lining or sample block after test, follow the requirements of 6.1.3 to measure and record the thickness and mass. 6.2 Test procedure for disc linings and drum linings for categories M3, N2, N3, O3, O4 vehicles 6.2.1 Test preparation 6.2.1.1 Determination of pressure The pressure per unit area of the friction surface of the sample block is 75 N/cm2 and the pressure of the brake lining is 1.17 MPa. 6.2.2 Run-in of sample block The lining or sample block shall be run-in before the formal test, until the contact area of the sample block with the brake disc is not less than 80%. The surface temperature of the brake disc during running-in shall not exceed 200 °C. The procedure for run-in of sample block is as shown in the test number 1 (run- in) in Table 3. 6.2.3 Measurement of initial thickness and mass Take out the sample block that have been run-in, measure and record the thickness of each measurement point of each sample block, accurate to 0.01 mm; weigh and record the mass of each sample block, accurate to 0.01 g. 6.2.4 Test procedure The test procedure is as shown in Table 3. 6.2.5 Measurement of final thickness and mass Remove the lining after test, follow the requirements of 6.2.3 to measure and record the thickness and mass.7 Report of results7.1 Collection of working friction coefficient 7.1.1 In the constant pressure mode, the collection point (μB) of the working friction coefficient is 1 s after each brake run, it is collected within the interval of ±1 s of this 1 s. The collection frequency is not less than 20 Hz, as shown in Figure 4. 7.1.2 In the constant torque mode, the collection point (μB) of the working friction coefficient is 1 s after the braking torque reaches 80% of the set value, it is collected within the interval of ±1 s of this 1 s. The collection frequency is not less than 20 Hz, as shown in Figure 5. 7.1.3 The working friction coefficient for each brake run is the average of the friction coefficients collected in the interval of (1 ± 0.1) s. Figure 4 -- Schematic diagram of the collection point of the working 7.2 Collection point of minimum friction coefficient (μmin) and maximum friction coefficient (μmax) 7.2.1 In the constant pressure mode, the collection point of the minimum friction coefficient is the minimum value of the friction coefficient from the start of each brake run to the end of this brake run. 7.2.2 In the constant torque mode, the collection point of the minimum friction coefficient is the minimum value of the friction coefficient from the end of 0.5 s after the braking torque reaches 80% of the set value to the end of this brake Time 7.4 Method of determining the minimum friction coefficient and the maximum friction coefficient The method of determining the minimum friction coefficient is to take the minimum value of the minimum friction coefficient as collected from each brake run [except for the test No.1 (run-in)] during the test. 7.5 Test report The test report shall include basic information, test parameters, working friction coefficient, maximum friction coefficient, minimum friction coefficient, thickness wear record, weight wear record, surface condition of the lining and brake disc after the test, etc. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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