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GB/T 5764-2023 PDF English

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GB/T 5764-2023: Clutch facings for automobiles
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GB/T 5764: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
GB/T 5764-2023English260 Add to Cart 0-9 seconds. Auto-delivery Clutch facings for automobiles Valid
GB/T 5764-2011English125 Add to Cart 0-9 seconds. Auto-delivery Clutch facings for automobiles Obsolete
GB/T 5764-1998English439 Add to Cart 4 days Clutch facings for automobiles Obsolete
GB 5764-1986English319 Add to Cart 3 days Clutch facings for automobiles Obsolete

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GB/T 5766   GB/T 5764   GB 5763   

GB/T 5764-2023: Clutch facings for automobiles

---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/GBT5764-2023
GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 43.040.40 CCS Q 69 Replacing GB/T 5764-2011 Clutch Facings for Automobiles Issued on. DECEMBER 28, 2023 Implemented on. JULY 01, 2024 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 Requirements... 6 5 Test Methods... 8 6 Inspection Rules... 15 7 Marking, Packaging, Transportation and Storage... 17 Appendix A (Informative) Recommendation List on Basic Dimension of Facing ... 18 Appendix B (Normative) Fixture for Bending Test... 19

Foreword

This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for Standardization – Part 1.Rules for the Structure and Drafting of Standardizing Documents. This Document replaced GB/T 5764-2011 Clutch Facings for Automobiles. Compared with GB/T 5764-2011, the major technical changes of this Document are as follows besides the structural adjustments and editorial modifications. a) Changed the “Scope” (see Clause 1 of this Edition; Clause 1 of the 2011 Edition); b) Add Normative References of GB/T 23263 (see 5.7.1 of this Edition), JC/T 2268 (see 5.7.2 of this Edition), GB/T 26125 (see 5.7.3 of this Edition); c) Delete the “Classification” (see Clause 4 of the 2011 Edition); d) Change the thickness difference requirements of each piece of "dimensional deviation" (see 4.2 of this Edition; 5.2 of the 2011 Edition); e) Change "friction property" (see 4.4 of this Edition; 5.4 of the 2011 Edition); f) Delete the content about Category-1 facings in the "Requirements" (see 5.4~5.6 of the 2011 Edition); g) Add “hazardous ingredients” (see 4.7 of this Edition); h) Add the measurement method of "limit of hazardous ingredients" (see 5.7 of this Edition); i) Change the “Inspection Rules” (see Clause 6 of this Edition; Clause 7 of the 2011 Edition); j) Change "Marking, packaging, transportation and storage" (see Clause 7 of this Edition; Clause 8 of the 2011Edition). Please note some contents of this Document may involve patents. The issuing agency of this Document shall not assume the responsibilities to identify these patents. This Document was proposed by China Building Materials Federation. This Document shall be under the jurisdiction of China Nonmetallic Mineral Products Standard Technical Committee (SAC/TC 406). Drafting organizations of this Document. Zhejiang Kema Friction Materials Co., Ltd.; Xianyang Design Institute of Nonmetallic Minerals Research; Laian County Longhua Friction Material Co., Ltd.; Nantong Wanda Friction Materials Co., Ltd.; and China Testing & Certification International Group (Xianyang) Co., Ltd. Chief drafting staffs of this Document. Hou Libing, Wang Zonghe, Shi Zhigang, Xue Zhengyu, Peng Peng, Wang Jiayyi, Zhang Honglin, Zhang Yang, Cao Shuai, and Du Ming. This Document was first-time published in 1986; first-time revised in 1998; second-time revised in 2011; and it is third-time revised hereby. Clutch Facings for Automobiles

1 Scope

This Document specifies the requirements, test methods, inspection rules, marking, packaging, transportation and storage of clutch facings for automobiles. This Document is applicable to winding dry friction clutch facings for automobiles (hereinafter referred to as "facings").

2 Normative References

The provisions in following documents become the essential provisions of this Document through reference in 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) is applicable to this Document. GB/T 2828.1 Sampling procedures for inspection by attribute - Part1.Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection GB 5763 Brake linings for automobiles GB/T 23263 Determination of asbestos in products GB/T 26125 Electrical and electronic products - Determination of six regulated substances (lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ethers) JB/T 7498 Coated abrasives - Abrasive paper JC/T 1065 Constant speed friction test machine JC/T 2268 Measurement of copper and other elements in brake friction materials

3 Terms and Definitions

For the purposes of this Document, the terms and definitions given in GB 5763 and the following apply. 3.1 Max flexibility; δ During the bending test, the distance of the top or bottom surface of the span center of the test piece deviates from the original position at the moment when the test piece breaks. 3.3 Rotate bursting test strength The limit rotating speed of the facing that is rotated at a specified angular acceleration on a rotational strength testing machine until it breaks.

4 Requirements

4.1 Appearance 4.1.1 The surface of the facing shall be smooth after processing, and there shall be no defects such as blisters, cracks, oil stains, unevenness, warping, and distortion that may affect use. 4.2 Dimensional-deviation The basic dimensions of the facings are shown in Appendix A or determined by the purchaser. The size deviation and thickness difference of each piece shall comply with the provisions of Table 1. 4.3 Flatness The flatness of the facing under the specified load shall comply with the provisions of Table 2. 4.4 Friction property 4.5 Bending property The bending strength and maximum strain of the facings shall comply with the provisions of Table 4. 4.6 Rotate bursting test strength The rotate bursting test strength of the facings under specified acceleration shall comply with the provisions of Table 5. 4.7 Hazardous ingredients 4.7.1 The facings shall not contain asbestos.

5 Test Methods

5.1 Appearance The appearance quality is checked visually. 5.2 Dimensional-deviation The outer diameter and inner diameter are measured by a vernier caliper with an accuracy of no less than 0.02mm; while the thickness is measured by a micrometer with an accuracy of no less than 0.01mm. 5.3 Flatness 5.4 Friction property 5.4.1 Test pieces 5.4.2 Test equipment 5.4.3 Test conditions 5.4.3.1 The pressure of the test piece is 0.49MPa. 5.4.4 Test procedures 5.4.5.1 The coefficient of dynamic friction at each test temperature is calculated according to Formula (1). 5.5 Bending property 5.5.1 Test piece 5.5.1.1 Three test pieces are prepared from the same facing along the friction direction. 5.5.1.2 The thickness of the test piece shall be the thickness of the facing, with a length of 55 mm ± 0.5 mm and a width of 15 mm ± 0.2 mm. If the length of the test piece is less than 55 mm, take 40 mm ± 0.5 mm. When sampling, the grooves in the test piece shall be avoided. 5.5.2 Test equipment 5.5.3 Test procedures 5.5.3.1 The thickness of the test piece shall be measured by a micrometer at three points in the middle; and the arithmetic mean value shall be taken. The width of the test piece shall be measured by a vernier caliper at three points in the middle; and the arithmetic mean value shall be taken. 5.5.3.2 Adjust the distance between the fulcrums according to the test piece. 5.5.3.3 Place the test piece on the fulcrum of the test fixture with the friction surface side facing up. 5.5.5 Expression of results The test results are expressed as the arithmetic mean of the test results of three test pieces, rounded off to one digit after the decimal point. 5.6 Rotate bursting test strength 5.6.1 Test pieces Take 6 complete facings with no defects in appearance quality as test pieces. Among them, 3 test pieces shall be tested at normal temperature and 3 test pieces shall be tested at high temperature. The reference dimension is Φ200mm×Φ134mm×3.5mm (without holes or grooves). 5.6.2 Test equipment The principle of testing equipment of rotate bursting test strength is shown in Figure 1; and the 5.6.3 Test procedures 5.6.3.1 Carry out idle test run first; and use a speedometer to check whether the set speed and angular acceleration are consistent with the test conditions. 5.6.3.2 Select the appropriate test fixture according to the size of the test piece. 5.6.3.3 Install the test piece on the test fixture and press it tightly; close and lock the test chamber. 5.6.4 Test report The limit rotation speed when the test piece rotates on the rotate strength testing machine under normal temperature or high temperature conditions until bursting is the rotate bursting test strength at normal temperature or high temperature; when the test piece reaches the upper limit of the equipment speed and still does not burst, record the upper limit speed as the test result, and indicate not bursting. 5.7 Limits of hazardous ingredients 5.7.1 The determination of asbestos content shall be carried out in accordance with the provisions of GB/T 23263.

6 Inspection Rules

6.1 Classification of inspection 6.1.1 Exit-factory inspection The exit-factory inspection items are shown in Table 7. 6.1.2 Type inspection The type inspection items are shown in Table 7.Type inspection shall be carried out when any of the following situations occurs. 6.3 Sampling plan 6.3.1 The appearance, dimensional deviation, and flatness of the facings are inspected by random sampling methods. According to GB/T 2828.1, a normal inspection sampling plan is used; and if the special inspection level is S-4, and the AQL value shall be 4.0.The sample size required for different batches and the determination of qualified or unqualified batches shall comply with the provisions of Table 8. 6.4 Judgment of results 6.4.1 Appearance, dimensional deviation and flatness shall be determined according to Table 8. 6.4.2 Except for 6.4.1, if all other inspection items meet the requirements of this Document, the batch of products shall be judged to be qualified. If any of the above inspection items is unqualified, double samples shall be taken for re-inspection; if the re-inspection results meet the requirements of this Document, the item shall still be judged to be qualified. If there is still one re-inspection result that does not meet the requirements of this Document, the item of this batch of product shall be judged to be unqualified.

7 Marking, Packaging, Transportation and Storage

7.1 Marking 7.1.1 The non-working surface of the facing shall have the manufacturer’s name or trademark, production date or batch number. 7.2 Packaging 7.2.1 The facings shall be packed tightly and neatly into clean, dry, strong and durable packaging boxes. 7.3 Transportation During transportation, the facings shall not be damaged or contaminated by oil or water. 7.4 Storage The facings shall be stored in a ventilated, dry room with a flat floor. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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