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The complete text of this standard is mandatory.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
It replaces GB 5763-2008 Brake linings for automobiles. The following changes have been made with respect to GB 5763-2008:
——“The provisions are mandatory” is changed to “the complete text of this standard is mandatory” (see Foreword; Foreword of Edition 2008);
——Normative references are modified (see clause 2; clause 2 of Edition 2008);
——Terms and definitions are modified completely (see clause 3; clause 3 of Edition 2008);
——Classification is deleted (see clause 4 of Edition 2008);
——“Technical requirements” is changed to “Basic requirements related to health and safety” (see clause 4; clause 5 of 2008 edition);
——Technical requirements for “appearance quality”, “dimensional deviation”, “impact strength”, “thermal expansion rate” and “compression strain” and their corresponding test methods are deleted (5.1, 5.2, 5.5, 5.6 and 5.7 as well as 6.1, 6.2, 6.4, 6.5, 6.6 and 6.7 of Edition 2008);
——Requirements for “limit of harmful ingredients” and their test methods are added (see 4.1, 5.1 and 5.2);
——Requirements for friction performance are changed from “coefficient of friction, tolerance and friction rate of appointed coefficient of friction at each test temperature of constant speed friction test” to “coefficient of friction at the normal temperature and at the high temperature of small sample bench test for drum linings used in vehicles of Categories M1, M2, N1, O1 and O2” and “operational coefficient of friction deviation and the like of drag test for friction performance of drum linings used in vehicles of Categories M3, N2, N3, O3 and O4 as well as for disk linings” and the test methods are changed correspondingly (see 4.2 and 5.3; 5.3 and 6.3 of Edition 2008);
——Requirements that "The shear strength of bonding rubber-based drum lining shall not be less than 1.0MPa at ambient temperature; lining area left on the shoe iron shall not be less than 70% after test” are added (see 4.3);
——Inspection rules are changed correspondingly (see clause 6; clause 7 of Edition 2008);
——Batching principle is changed from “the actually delivered linings of the same material and specification are regarded as a batch” to “the products are divided into three categories according to disc linings; drum linings used in vehicles of Categories M1, M2, N1, O1 and O2; and drum linings used in vehicles of Categories M3, N2, N3, O3 and O4. The actually delivered linings produced according to the same formula and process and in the same month are regarded as a batch” (see 6.2; 7.2.1 of Edition 2008);
——“the non-working surface of lining shall be printed with manufacturer's name or trademark” is changed to “the non-working surface of lining shall be printed with manufacturer's name (abbreviation) or trademark (code)” (see 7.1.1; 8.1.1 of Edition 2008);
——“There shall be appointed coefficient of friction printed” on the packaging box is changed to “drum linings used in vehicles of Categories M1, M2, N1, O1 and O2 shall also be marked with class code of coefficient of friction; drum linings used in vehicles of Categories M3, N2, N3, O3 and O4 and disc linings shall also be marked with appointed coefficient of friction” (see 7.1.2; 8.1.2 of Edition 2008).
This standard was proposed by and is under the jurisdiction of the Ministry of Industry and Information Technology of the People's Republic of China.
The previous editions of the standard are as follows:
——GB 5763-1986, GB 5763-1998 and GB 5763-2008.
Brake linings for automobiles
1 Scope
This standard specifies terms and definitions, basic requirements related to health and safety, test methods, inspection rules, marking, packaging, transportation and storage, etc. of brake linings for automobiles.
It is applicable to brake linings for automobiles (hereinafter referred to as linings).
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 5620 Road vehicles - braking of automotive vehicles and their trailers - Vocabulary
GB/T 15089 Classification of power-driven vehicles and trailers
GB/T 17469 Characteristics evaluation of brake linings for automobile - Small sample bench test method
GB/T 22309 Road vehicles - Brake linings - Shear test procedure for disc break pad and drum brake shoe assemblies
GB/T 23263 Determination of asbestos in products
GB/T 34007 Road vehicles - Brake lining friction materials - Drag test method for friction performance
JC/T 2268 Measurement of copper and other elements in brake friction materials
3 Terms and definitions
For the purposes of this standard, the terms and definitions specified in GB/T 5620 and GB/T 15089 as well as the following ones apply.
3.1
coefficient of friction
ratio of the tangential force (i.e. friction force) impeding the relative movement of two objects to the normal force acted on the object surface
3.2
coefficient of friction at the normal temperature
μnormal temperature
average of coefficient of friction at 4 temperatures, i.e. 93℃, 121℃, 149℃ and 204℃ in the second fade test of small sample bench test, see GB/T 17469 for details
3.3
coefficient of friction at the high temperature
μhigh temperature
average of coefficient of friction at 10 temperatures, i.e. 204℃ and 149℃ in the first recovery test, 232℃, 260℃, 288℃, 316℃ and 343℃ in the second fade test and 260℃, 204℃ and 149℃ in the second recovery test of small sample bench test, see GB/T 17469 for details
3.4
classification for coefficient of friction
coefficient of friction, divided into 6 classes, i.e. C, D, E, F, G and H, in an order from small to large in small sample bench test, see GB/T 17469 for details. For drum linings used in in vehicles of Categories M1, M2, N1, O1 and O2, their coefficients of friction are expressed in class code alphabets, in which the first one represents the coefficient of friction at the normal temperature and the second one represents the coefficient of friction at the high temperature
3.5
operational coefficient of friction
μoperational
when the disc linings used in vehicles of Categories M1, M2, N1, O1 and O2 are subjected to drag test for friction performance, the average of coefficient of friction measured in the first braking operation of each braking cycle with test serial number of 3 and 4 in constant pressure mode or the average of coefficient of friction measured in the first braking operation of each braking cycle with test serial number of 3, 5 and 7 in constant torque mode, see GB/T 34007 for details
3.6
operational 1 coefficient of friction
μoperational 1
when disc and drum linings used in vehicles of Categories M3, N2, N3, O3 and O4 are subjected to drag test for friction performance, the average of coefficient of friction measured in 5 braking operations with test serial number of 2 in constant pressure mode, see GB/T 34007 for details
3.7
operational 2 coefficient of friction
μoperational 2
when disc and drum linings used in vehicles of Categories M3, N2, N3, O3 and O4 are subjected to drag test for friction performance, the average of coefficient of friction measured in 10 braking operations with test serial number of 10 in constant pressure mode, see GB/T 34007 for details
3.8
appointed coefficient of friction
the value of operational coefficient of friction expressed in the drag test method for friction performance appointed by manufacturer of the lining, which depends on the formula and production process of the lining
Disc linings used in in vehicles of Categories M1, M2, N1, O1 and O2 are expressed as PA + appointed coefficient of friction in constant pressure mode test of original sample method, PS + appointed coefficient of friction in constant pressure mode test of sampling method, MA + appointed coefficient of friction in constant torque mode test of original sample method and MS + appointed coefficient of friction in constant torque mode test of original sampling method.
Disc and drum linings used in vehicles of Categories M3, N2, N3, O3 and O4 are expressed as PS + appointed operational 1 coefficient of friction/appointed operational 2 coefficient of friction
4 Basic requirements related to health and safety
4.1 Limit of harmful ingredients
4.1.1 Asbestos shall not be contained in the lining.
4.1.2 Other harmful elements in the lining shall not exceed the limits as specified in Table 1.
Table 1
Name of harmful element Limits (mass fraction) %
Cadmium ≤0.01
Hexavalent chromium ≤0.1
Lead ≤0.1
Mercury ≤0.1
4.2 Friction performance
4.2.1 Small sample bench test results of drum linings used in vehicles of Categories M1, M2, N1, O1 and O2 shall meet the following requirements:
a) μnormal temperature shall not be less than 0.25 and shall meet the specified class.
b) μhigh temperature shall not be less than 0.25 and shall meet the specified class.
c) The coefficient of friction at any point of temperature range of 93℃ to 288℃ in the second fade and temperature range of 149℃ to 93℃ in the second recovery of 5 tests is not less than 0.15; and difference between the coefficients of friction at each temperature point and average of the five tests is no more than 20%.
4.2.2 Test results of the drag test for friction performance of disc linings used in vehicles of Categories M1, M2, N1, O1 and O2 shall meet the following requirements:
a) μoperational is within ±15% of the appointed coefficient of friction;
b) after the test, the lining shall be free from delamination or falling off.
4.2.3 Test results of the drag test for friction performance of disc and drum linings used in vehicles of Categories M3, N2, N3, O3 and O4 shall meet the following requirements:
a) μoperational 1 and μoperational 2 are within ±15% of the appointed coefficient of friction respectively;
b) after the test, the lining shall be free from delamination or falling off.
4.3 Shear strength
4.3.1 The shear strength of bonding resin-based drum lining shall not be less than 1.5MPa at ambient temperature.
Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Basic requirements related to health and safety 5 Test methods 6 Inspection rules 7 Marking, packaging, transportation and storage
ICS 43.040.40 Q 69 中华人民共和国国家标准 GB 5763—2018 代替GB 5763—2008 汽车用制动器衬片 Brake linings for automobiles 2018—11—19发布 2019—10—01实施 国家市场监督管理总局 中国国家标准化管理委员会 发布 前言 本标准为全文强制。 本标准按照GB/T 1.1—2009给出的规则起草。 本标准代替GB 5763—2008《汽车用制动器衬片》。与GB 5763—2008相比，主要技术变化如下： ——将条文强制修改为全文强制(见本前言，2008年版的前言)； ——规范性引用文件有所改变(见第2章，2008年版的第2章)； ——术语和定义全部修改(见第3章，2008年版的第3章)； ——取消了分类(2008年版的第4章)； ——将“技术要求”修改为“涉及健康和安全的基本要求”(见第4章，2008年版的第5章)； ——取消了“外观质量”“尺寸偏差”“冲击强度”“热膨胀率”“压缩应变”的技术要求及其相应的试验方法(2008年版的5.1、5.2、5.5、5.6、5.7及6.1、6.2、6.4、6.5、6.6、6.7)； ——增加了“有害成分限量”的要求及其试验方法(见4.1、5.1、5.2)； ——将摩擦性能要求由“定速摩擦试验的各个试验温度的摩擦系数、指定摩擦系数的允许偏差、磨损率”修改为“M1、M2、N1、O1、O2类车辆使用的鼓式衬片的小样台架试验常温和高温摩擦系数等”和“盘式衬片及M3、N2、N3、O3、O4类车辆使用的鼓式衬片的摩擦性能拖曳试验测试的工作摩擦系数偏差等”，试验方法也相应作了修改(见4.2、5.3，2008年版的5.3、6.3)； ——增加了“粘结型橡胶基鼓式衬片在室温下的剪切强度不得小于1.0 MPa，试验后留在蹄铁上的衬片的面积不得小于70％”的要求(见4.3)； ——检验规则作了相应修改(见第6章，2008年版的第7章)； ——将组批原则由“以同材质同规格的衬片的实际交货量为一批”修改为“产品按盘式衬片、M1、M2、N1、O1、O2类车辆使用的鼓式衬片、及M3、N2、N3、O3、O4类车辆使用的鼓式衬片分成3类，每类产品以同配方同工艺同月份生产的衬片的实际交货量为一批”(见6.2，2008年版的7.2.1)；将“衬片的非工作面上应印有制造厂名或商标”修改为“衬片的非工作面上应有制造厂名称(简称)或商标(代号)”(见7.1.1，2008年版的8.1.1)； ——将包装箱上“应印有指定摩擦系数”修改为“M1、M2、N1、O1、O2类车辆使用的鼓式衬片还应标有摩擦系数级别代号；盘式衬片和M3、N2、N3、O3、O4类车辆使用的鼓式衬片还应标有设定摩擦系数值”(见7.1.2，2008年版的8.1.2)。 本标准由中华人民共和国工业和信息化部提出并归口。 本标准所代替标准的历次版本发布情况为： ——GB 5763—1986、GB 5763—1998、GB 5763—2008。 汽车用制动器衬片 1 范围 本标准规定了汽车用制动器衬片的术语和定义、涉及健康和安全的基本要求、试验方法、检验规则、标志、包装、运输与贮存等。 本标准适用于汽车用制动器衬片(以下简称“衬片”)。 2规范性引用文件 下列文件对于本文件的应用是必不可少的。凡是注日期的引用文件，仅注日期的版本适用于本文件。凡是不注日期的引用文件，其最新版本(包括所有的修改单)适用于本文件。 GB/T 5620道路车辆 汽车和挂车 制动名词术语及其定义 GB/T 15089机动车辆及挂车分类 GB/T 17469汽车制动器衬片摩擦性能评价 小样台架试验方法 GB/T 22309 道路车辆 制动衬片 盘式制动块总成和鼓式制动蹄总成剪切强度试验方法 GB/T 23263制品中石棉含量测定方法 GB/T 34007道路车辆 制动衬片摩擦材料 摩擦性能拖曳试验方法 JC/T 2268制动摩擦材料中铜及其他元素的测定方法 3术语和定义 GB/T 5620和GB/T 15089界定的以及下列术语和定义适用于本文件。 3.1 摩擦系数 coefficient of friction 阻碍两物体相对运动的切向力(即摩擦力)对作用到该物体表面的法向力之比。 3.2 常温摩擦系数coefficient of friction at the normal temperature μ常温 在小样台架试验的第二次衰退试验中，在93℃、121℃、149℃、204℃4个温度点的摩擦系数的平均值。详见GB/T 17469。 3.3 高温摩擦系数coefficient of friction at the high temperature μ高温 在小样台架试验的第一次恢复试验的204℃、149℃、第二次衰退试验的232℃、260℃、288℃、316℃、343℃以及第二次恢复试验的260℃、204℃、149℃，总共10个温度点的摩擦系数的平均值。详见GB/T 17469。 3.4 摩擦系数级别classification for coefficient of friction 在小样台架试验中，将摩擦系数值从小到大分为C、D、E、F、G、H六级，详见GB/T 17469。对于M1、M2、N1、O1、O2类车辆使用的鼓式衬片，其摩擦系数值用级别代号字母表示，第一个字母表示常温摩擦系数值，第二个字母表示高温摩擦系数值。 3.5 工作摩擦系数operational coefficient of friction μ工作 M1、M2、N1、O1、O2类车辆使用的盘式衬片进行摩擦性能拖曳试验时，在恒压力方式下试验序号3、试验序号4中每个制动循环的第1次制动运行测得的摩擦系数平均值，或在恒力矩方式下试验序号3、试验序号5、试验序号7中每个制动循环的第1次制动运行测得的摩擦系数平均值。详见GB/T 34007。 3.6 工作摩擦系数1 operational 1 coefficient of friction μ工作1 M3、N2、N3、O3、O4类车辆使用的盘式和鼓式衬片进行摩擦性能拖曳试验时，在恒压力方式下试验序号2中5次制动运行测得的摩擦系数的平均值。详见GB/T 34007。 3.7 工作摩擦系数2 operational 2 coefficient of friction μ工作2 M3、N2、N3、O3、O4类车辆使用的盘式和鼓式衬片进行摩擦性能拖曳试验时，在恒压力方式下试验序号10中10次制动运行测得的摩擦系数的平均值。详见GB/T 34007。 3.8 设定摩擦系数appointed coefficient of friction 由衬片的制造商设定的在摩擦性能拖曳试验方法中表现出的工作摩擦系数值，取决于衬片的配方和生产工艺。 对于M1、M2、N1、O1、O2类车辆使用的盘式衬片，采用原样法恒压力方式测试表示为PA+设定摩擦系数值，采用取样法恒压力方式测试表示为PS+设定摩擦系数值，采用原样法恒力矩方式测试表示为MA+设定摩擦系数值，采用取样法恒力矩方式测试表示为MS+设定摩擦系数值。 对于M3、N2、N3、O3、O4类车辆使用的盘式和鼓式衬片，表示为PS+设定工作摩擦系数1/设定工作摩擦系数2。 4涉及健康和安全的基本要求 4.1 有害成分限量 4.1.1衬片中不得含有石棉。 4.1.2衬片中其他有害元素不得超过表1规定的限量要求。 表1 有害元素名称 限量要求(质量分数) ％ 镉 ≤0.01 六价铬 ≤0.1 铅 ≤0.1 汞 ≤0.1
