GB/T 3565.4-2022Safety requirements for bicycles - Part 4: Braking test methods (English PDF)

Foreword

This document was issued on 30 December 2022 by the State Administration for Market Regulation; Standardization Administration of the PRC and takes effect on 1 October 2023.

It is a GB/T standard: recommended rather than compulsory, but it is the text a Chinese reviewer applies when assessing a submission.

It is classified under ICS 43.150, Chinese classification Y14.

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules for Standardization Documents"

drafting.

This document is part 4 of GB (/T) 3565 "Safety Requirements for Bicycles". And GB 3565.2 "Bicycle Safety Requirements Part 2

Subdivision. Requirements for City and Touring Bicycles, Youth Bicycles, Mountain Bicycles and Competition Bicycles" is the supporting standard. GB (/T)3565

The following 9 parts have been released.

--- Part 1.Terms and definitions;

--- Part 2.Requirements for city and touring bicycles, youth bicycles, mountain bikes and racing bicycles;

--- Part 3.General test methods;

--- Part 4.Brake test method;

--- Part 5.Test methods for handlebars;

--- Part 6.Test methods for frame and front fork;

--- Part 7.Test methods for wheels and rims;

--- Part 8.Test methods for pedals and drive systems;

--- Part 9.Test methods for saddles and saddle tubes.

This document is modified to adopt ISO 4210-4.2014 "Safety requirements for bicycles and two-wheeled bicycles - Part 4.Test methods for brakes".

The technical differences between this document and ISO 4210-4.2014 and their reasons are as follows.

--- Replaced ISO 4210-1 with the normatively quoted GB/T 3565.1 to adapt to my country's technical conditions and increase operability (see

Clause 3, Clause 3 of ISO 4210-4.2014);

--- In the "Measurement method of C-type brake handle", the inspection method of "brake handle with position adjustment" is added, which is consistent with GB 3565.2;

Changed the "Installation method of the gauge in C-type brake handle and handle bar in Figure 4" to correct the error in the original figure (see 4.1.2, Figure 4, ISO 4210-4.

Figure 4 of.2014);

---In the "dry state test" of the "testing machine test method", change the operating force from "completely applied within 1s" to "0.5s after the brake is activated"

"Complete application within" to facilitate accurate measurement of braking performance; delete "time to measure each operating force increment" and "time to measure braking force

Time", which is convenient for test measurement and operability [see 4.6.5.7c)1), ISO 4210-4.2014's 4.6.5.7c)1)];

--- In the "brake heat resistance test", the requirement that "the brake system can be adjusted" is added to make the braking performance comparison under the same conditions

Compared with; increase the coefficient "c" in the braking energy calculation formula (5) to adapt to the various qualities of the bicycle recommended (see 4.7).

The following editorial changes have been made to this document.

--- Change the name of the standard to "Bicycle Safety Requirements Part 4.Brake Test Method" in order to be compatible with the existing standardized documents

coordination.

Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents.

This document is proposed by China National Light Industry Council.

This document is under the jurisdiction of the National Bicycle Standardization Technical Committee (SAC/TC155).

This document is drafted by. Tangze Transportation Equipment (Taizhou) Co., Ltd., Shanghai Xiedian Technology Service Co., Ltd., Lanxi Lunfeng Vehicle Material Co., Ltd.

Company, Shanghai Phoenix Bicycle Co., Ltd., Giant (China) Co., Ltd., Shenzhen Meidahang Technology Co., Ltd., Dimai (Shanghai) Enterprise

Management Co., Ltd., Tianneng Battery Group Co., Ltd., Kunshan Customs Comprehensive Technical Service Center, Tianjin Product Quality Supervision and Testing Technology Research Institute

Research Institute Bicycle Research Center, Wuxi Inspection and Certification Research Institute, Taizhou Product Quality and Safety Inspection Research Institute, Intertek (Tianjin) Quality

Technical Services Ltd.

The main drafters of this document. Liu Xinzhen, Ruan Li, Chen Xuefu, Cao Zhongming, Shi Xin, Chen Jun, Xu Hao, Jia Gang, Chen Pingwei, Zhang Fengbo, Wu Yongbin,

Ye Zhentao.

Introduction

GB (/T) 3565 "Safety Requirements for Bicycles" was drafted according to the safety requirements of bicycle products.

To produce bicycles that are as safe as possible. GB (/T) 3565 "Bicycle Safety Requirements" consists of 9 parts.

--- Part 1.Terms and definitions. The purpose is to unify the terminology used in each part of the standard.

--- Part 2.Requirements for city and touring bicycles, youth bicycles, mountain bikes and racing bicycles. purpose is

Classify the safety requirements of Category 4 bicycles into mandatory national standards for easy enforcement.

--- Part 3.General test methods. The purpose is to centralize and unify the general test methods for bicycle safety requirements and facilitate operation.

--- Part 4.Brake test method. The purpose is to carry out professional tests on the brake requirements in the bicycle safety requirements, and provide a basis for the brake test

Opportunities for method improvement.

--- Part 5.Test methods for handlebars. The purpose is to carry out professional tests on the handlebar requirements in the bicycle safety requirements, and to provide a basis for the handlebar test

Opportunities for method improvement.

--- Part 6.Test methods for frame and fork. The purpose is to conduct a professional review of the requirements for frame and front fork in bicycle safety requirements.

Test and provide opportunities for improved test methods for frames and forks.

--- Part 7.Test methods for wheels and rims. The purpose is to conduct a professional review of the requirements for wheels and rims in bicycle safety requirements

Test and provide opportunities for improvement of test methods for wheels and rims.

--- Part 8.Test methods for pedals and drive systems. The purpose is to meet the requirements for pedals and drive systems in bicycle safety requirements

Conduct specialized tests and provide opportunities for improved test methods for pedal and drive systems.

--- Part 9.Test methods for saddles and saddle tubes. The purpose is to conduct a professional review of the requirements for saddles and saddle tubes in bicycle safety requirements

Test, and provide opportunities for the improvement of test methods for saddles and saddle tubes.

GB 3565.2 is a mandatory national standard, and 7 test method standards (GB/T 3565.3~GB/T 3565.9) are recommended national standards

Standard, used in conjunction with GB 3565.2.These 7 test method standards are designed to ensure the strength and reliability of individual components and bicycles

Meet the requirements, and require consideration of safety aspects from the design stage.

The scope of GB (/T) 3565 is limited to product safety considerations. If bicycles are used on public roads, the "Chinese People's

The Road Traffic Safety Law of the Republic and relevant management regulations.

To improve repeatability and reproducibility, and to take into account suitability, size and operator effects for all types of bicycles, the test

The machine test method reflects the current advanced level and is more popular than the road test method.

The safety and quality of bicycles is related to the traffic life safety of consumers. Since 1983, my country has released three versions of

GB 3565.It has been 17 years since GB 3565-2005 was released and implemented.

Provided technical support. GB 3565-2005 "Safety Requirements for Bicycles" is equivalent to ISO 4210.1996 "Safety Requirements for Two-wheeled Bicycles"

Require". In.2014, ISO 4210 was revised and released again, from 1 standard to 9 standards. For this reason, GB 3565 also changed from the original

1 standard was revised into 9 standards, the standard level is synchronized with the international standard, and continues to provide technical support for the safety of bicycle products in our country.

Bicycle Safety Requirements

Part 4.Test methods for brakes

1 Scope

GB/T 3565.4-2022 is the part of the series that gives the test methods for bicycle brakes — the grip dimensions, measured with a gauge placed on the handlebar or grip and on the brake lever, the position at which force is applied to the lever, the assembly safety test on brake shoes and brake discs, the strength tests for hand-operated and for foot-operated braking systems, the braking performance test, and the heat resistance test. The part carries no acceptance values of its own: the requirements sit in GB 3565.2, and the bicycle types covered are the ones named there. Fixing the method is what makes those requirements mean anything. A lever loaded at a different point along its length, or a grip span wider than a rider can actually close, yields a stopping figure no other laboratory can reproduce, and a brake that performs when cold can lose its grip on a long descent once the shoe or the disc has heated — which is why the heat resistance test is separate from the performance test. Terms come from GB/T 3565.1. Used by bicycle and brake component manufacturers, test laboratories, certification bodies and market surveillance authorities.

This document describes the grip dimensions of bicycle brakes, the location of brake lever force, assembly safety, braking system strength, braking performance, heat resistance

sex test method.

This document is applicable to the test of brake components of bicycle types involved in GB 3565.2.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references

For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to

this document.

GB/T 3565.1 Bicycle Safety Requirements Part 1.Terms and Definitions (GB/T 3565.1-2022, ISO 4210-1.2014,

MOD)

GB 3565.2-2022 Bicycle Safety Requirements Part 2.City and Touring Bicycles, Youth Bicycles, Mountain Bicycles

Requirements for racing bicycles (ISO 4210-2.2015, MOD)

Note. There is no technical difference between the referenced content of GB 3565.2-2022 and the referenced content of ISO 4210-2.2015.

3 Terms and Definitions

The terms and definitions defined in GB/T 3565.1 apply to this document.

4 Test method

4.1 Grip Dimensions

4.1.1 Measurement method of A-type or B-type brake handle

Place the gauge shown in Figure 1 on the grip of the handlebar or the handlebar (when the manufacturer does not install the grip) and on the brake lever, as shown in Figure 2.

As shown, make surface A close to the outer surface of the handlebar (or handlebar) and the brake handle. The B side is equivalent to the rider's fingers touching the brake handle.

The section of the brake lever covered by the surface does not tend to move towards the handlebar or grip. Then measure a, which is the brake lever that the rider's finger touches when holding the lever

The distance from the last part to the end of the brake lever. Measurements should be taken on a fully assembled bicycle.