GB/T 29064-2012 English PDF

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GB/T 29064-2012: Road vehicles -- Brake lining friction materials -- Friction behaviour assessment method for automotive brake systems
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 29064-2012	614	Add to Cart	3 days	Road vehicles -- Brake lining friction materials -- Friction behaviour assessment method for automotive brake systems	Valid

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Basic data

Standard ID: GB/T 29064-2012 (GB/T29064-2012)
Description (Translated English): Road vehicles -- Brake lining friction materials -- Friction behaviour assessment method for automotive brake systems
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Q69
Classification of International Standard: 46.040.40
Word Count Estimation: 31,349
Quoted Standard: ISO 611; ISO 15484; UNECE R13-H
Adopted Standard: ISO 26867-2009, IDT
Regulation (derived from): National Standards Bulletin No. 41 of 2012
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the pressure, temperature, given the specified line speed dual parts (brake disc or brake drum) coefficient of friction material impact evaluation methods. This standard applies to contrast friction material under the same conditio

GB/T 29064-2012: Road vehicles -- Brake lining friction materials -- Friction behaviour assessment method for automotive brake systems

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Road vehicles.Brake lining friction materials.Friction behaviour assessment method for automotive brake systems ICS 43.040.40 Q69 National Standards of People's Republic of China Road vehicles Brake linings Friction materials Automotive brakes Evaluation Method of System Friction Performance (ISO 26867..2009, IDT) 2012-12-31 release 2013-09-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Management Committee released Directory Preface III Introduction IV 1 Scope 1 2 normative reference document 1 3 Terms and definitions 1 4 symbols and abbreviations 4 4.1 Symbol 4 4.2 Abbreviations 5 5 Test conditions and preparation 5 5.1 Axial inertia 5 5.2 Rear axle inertia 5 5.3 Test wheel load 6 5.4 Braking pressure rise rate 6 5.5 Maximum pressure 6 5.6 No help pressure level 6 5.7 sampling rate 6 5.8 Initial braking temperature 6 5.9 Brake heating 6 Temperature measurement 6 5.11 Measurement of brake fluid displacement 6 5.12 Cooling air condition 6 5.13 Cooling air flow rate or flow rate 7 5.14 Setting of air conditioning temperature and absolute humidity (humidity ratio) 7 5.15 between the two brake inertia test bench speed 7 5.16 Brake installation positioning 7 5.17 Direction of cooling air for brake 7 5.18 Brake cooling rate 7 5.19 Wear measurement 7 5.20 side beating 7 5.21 Brake disc or brake drum condition 5.22 Decay test item 7 5.23 data collection 8 6 Test procedure 9 6.1 Product monitoring test procedure (non-option) 9 6.2 Product development test procedures (with additional items) 11 6.3 Calculation of standard friction value in test procedure 7 Test Report 15 7.1 General 15 7.2 Graphic Report 15 7.3 Table data for each brake 15 7.4 Wear measurement 16 7.5 Test conditions 16 7.6 Cooling air condition 16 7.7 Brake cooling rate 16 7.8 Friction value 16 7.9 Statistical analysis Appendix A (informative) Disc Brake Test Report Example 17 Appendix B (informative appendix) Instantaneous friction value Histogram 21 Appendix C (informative) Reference Calculation of Cooling Air Speed and Flow 23 Reference 25

Foreword

This standard is drafted in accordance with the rules given in GB/T 1.1-2009. This standard uses the translation method equivalent to the international standard ISO 26867..2009 "Road vehicle brake lining friction material Car brake System friction performance evaluation ". And the normative reference in this standard international documents are consistent with the relationship between China's documents are as follows. GB/T 5620-2002 Road vehicles - Glossary terms for automobile and trailer brakes and their definitions (GB/T 5620-2002, ISO 611..1994, IDT); --- GB/T 26738-2011 Road vehicle brake lining friction material Product confirmation and quality assurance (GB/T 26738- 2011, ISO 15484..2008, IDT). This standard is proposed by the China Building Materials Federation. This standard is the national non-metallic mineral products and products Standardization Technical Committee (SAC/TC406) centralized. The drafting unit. Dongying Borui Brake System Co., Ltd., Tonglu Yuxin Auto Parts Co., Ltd., Ningguo Eagle Auto Parts Co., Ltd. Co., Ltd., Zhuhai Greeley Friction Material Co., Ltd., Hubei Feilong Friction Sealing Material Co., Ltd., Jiangyin Hicklin Friction Material Material Co., Ltd., Chongqing Hongyu friction products Co., Ltd., the national non-metallic mineral products quality supervision and inspection center. The main drafters of this standard. Shi Zhigang, Hou Libing, Li Kang, Zhang Hongguang, Wang Shengxin, Sun Qichun, Ma Yanbing, Xu Keling, Wang Danying, Feng Dingding, Du Ming

Introduction

In the process of coordinating the application of automobile braking system, the modern evaluation of friction performance is imperative. This standard is intended to replace the previous end All based on a single trailing brake as a friction performance evaluation test procedures, it does not take into account the real life of the driving conditions or vehicle specific parameters. Friction materials are tested and evaluated under different conditions to determine the breadth of data. These data are in different stages of product life, Such as manufacturing process development, production validation, quality control, product stereotypes and application areas of the assessment is very critical. This standard is intended to be used in conjunction with other applicable standards or test procedures (ISO , SAE, JIS/JASO, national laws or regulations, other items or users Specified test procedures) to evaluate the friction material under different conditions to ensure the breadth of its data. This standard is not included National laws or regulations in the braking distance, braking force distribution, different vehicle conditions (speed, temperature, tire adhesion, car load) and brake system Performance requirements for operating conditions. This standard is used as a test procedure for the evaluation of the inertia test bench of friction performance, instead of the previous basis based on a single fully traced test protocol. This standard supports friction performance evaluation of friction material life cycle. The friction performance evaluation and description are very limited when subjected to a drag test with a sample or a shrink test bench. Drag and drop brake with actual driving Conditions, braking system characteristics or vehicle dynamics. Friction of the dual surface (friction lining and brake disc or brake drum) transfer layer of chemistry The nature and structure of the development will produce changes in the coefficient of friction, resulting in changes in the characteristics, such as sliding speed, surface and temperature distribution, brake pressure Force, braking energy and surface local structure. In any braking process, the braking energy is proportional to the vehicle mass distribution and the dynamic mass transfer of. This is directly related to the wheelbase of the vehicle, the center of gravity, the height of the vehicle itself, which can directly affect the performance of the friction material. When the same brake lining Or part number for different vehicles, the different performance depends on its load, speed, operating temperature, applied force and work experience. modern The test equipment enables the friction formula designers, process designers, application engineers, manufacturing personnel to obtain extensive and detailed under various braking conditions The friction characteristics of the brake lining or lining. This standard is intended to evaluate the friction performance of a range of travel speeds, braking temperatures, brake pressures and deceleration levels price. This new procedure has the following advantages. - standard methods for determining frictional performance during early review, benchmarking, development or production monitoring phases; - the average torque and pressure calculation using the distance meter; - statistical data on instantaneous friction; - Evaluate the braking distance with the fully emitted average braking deceleration; - control and record environmental conditions. Road vehicles Brake linings Friction materials Automotive brakes Evaluation Method of System Friction Performance

1 Scope

This standard specifies the effect of pressure, temperature, and linear velocity on the friction coefficient of a given friction material (brake disc or brake drum) Evaluation method. This standard applies to the comparison of friction materials under the same conditions, or when the lack of friction material control specifications and the performance requirements of the friction material Or to limit the performance of certain friction materials. Taking into account the cooling systems of different types of inertia test benches and ensuring repeatable temperature increases The braking temperature is the control item in the decay test. The selected brake and brake discs are determined according to the project. In the production verification test, the test results can be combined with statistical process control as part of the quality assurance program. Specific items or dollars Delineate its scope of application and evaluation criteria. This standard allows the number of test units and braking times to be increased during product development.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article Pieces. For undated references, the latest edition (including all modifications) applies to this document. ISO 611 Road Vehicles Car and Trailer Braking Glossary (Roadvehicles-Brakingofautomotivevehiclesand theirtrailers-Vocabulary) ISO 15484 Road vehicles Brake linings Friction materials Product validation and quality assurance (Roadvehicles-Brakelining frictionmaterials-Productdefinitionandqualityassurance) Uniform provisions of UNECER13-H regulations for passenger car brake system type certification (Uniformprovisionsconcerningthe approvalofpassengercarswithregardtobraking)

3 terms and definitions

ISO 611, ISO 15484 and UNECER 13-H and the following terms and definitions apply to this document. 3.1 Friction value Disc Brake or Drum Brake Brakes up to 95% of the setpoint (pressure or deceleration) to drop to 95% of the setpoint value. The average value of all instantaneous frictional values obtained between the braking distances. Note 1. For disc brakes, the average of the friction values is obtained by equation (1) (see definition 3.2). Note 2. For drum brakes, the average of the friction values is obtained by equation (2) (see definition 3.3). Note 3. The average value of the friction values obtained by the braking distance during each individual braking process is given in Table 4 "Friction values". 3.2 Instantaneous friction value instantaneousfrictionvalue μ * (Disc brake) at any given time point instantaneous output torque and instantaneous input torque ratio, according to formula (1) calculation. ......

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