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QC/T 564-2018Performance requirements and bench test methods for passenger car service brakes (English PDF)

乘用车行车制动器性能要求及台架试验方法

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Issued by

MIIT

Level / Type

Industry · Recommended

Issue date

July 4, 2018

Implementation date

January 1, 2019

Scope

QC/T 564-2018 is the English-translated version of 乘用车行车制动器性能要求及台架试验方法.

QC/T 564-2018 covers the service brake of a passenger car, setting out terms and definitions, performance requirements, test-related requirements, test preparation and test methods, with a normative Appendix A on the braking torque value method.

It applies to service brake assemblies and friction lining (lining block) assemblies for the category M1 passenger cars classified in GB/T 15089.

Clause 4 asks for an average braking torque no lower than 80% of the lower design limit in the first efficiency test, or 72% of the design value where no lower limit is given, for at least 75% of the second efficiency test value in the first room temperature efficiency test, for an average deceleration of no less than 3.0 m/s² in the optional pipeline failure test, and for braking noise below 76 dB(A).

The work is done on an inertial brake bench with indicating instruments of accuracy grade no lower than 2.5, brake drum radial runout no greater than 0.2 mm and thermocouples installed to QC/T 556, at an initial braking temperature of 80 ± 2 °C in the first efficiency test and with running-in at a deceleration of 3.5 m/s², before the fading recovery, abrasion and post-wear efficiency tests.

It replaces QC/T 564-2008, was issued on 4 July 2018 and has applied since 1 January 2019.

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Document preview — QC/T 564-2018

National Standard of the People's Republic of China

Replacing: QC/T 564-2008

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

Foreword3
1 Scope5
2 Normative references5
3 Terms and definitions5
4 Performance requirements10
5 Test-related requirements13
6 Test preparation14
7 Test method16
Appendix A (Normative) Braking torque value method24

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009 "Directives for standardization - Part 1: Structure and drafting of standards".

This standard replaces QC/T 564-2008 "Performance requirements and bench test methods for passenger car brake". Compared with QC/T 564-2008, the main technical changes are as follows.

- MODIFY the definitions of the terms "average braking torque" and "average braking pressure" (see 3.3, 3.6; 3.3 and 3.6 of the 2008 edition);

- ADD the terms and definitions of "invariable input mode" and "invariable output mode" (see 3.13, 3.14)

- MODIFY the benchmark vehicle speed and speed stability evaluation indicators for the braking torque evaluation in the efficiency test (see 4.1.1, 4.1.3, 4.1.8; 4.1.1, 4.1.2, 4.1.5 of the 2008 edition);

- ADD the room temperature efficiency test (see 4.1.2, 4.1.7, 7.1.4, 7.1.13);

- ADD the one pipeline failure test (see 4.1.4, 7.1.7);

- ADD the thermal efficiency test after the fading test (see 4.1.5c), 7.1.9.3);

- ADD the quantitative evaluation method and evaluation indicator of brake drag phenomenon, after the decline recovery test (see 4.1.5 d), 7.1.9.6.1);

- ADD the braking efficiency test after the wear test (see 4.2.2, 7.2.5)

- ADD the calculation method of the rotation moment of inertia for the failure test of one pipeline (see 6.3.2);

- MODIFY the initial brake temperature of the wear test (see 7.2.4; 7.2.3 of the 2008 edition).

1 Scope

1.1 This standard specifies the terms and definitions, performance requirements, test-related requirements, test preparations, test methods for passenger car service brake assemblies.

1.2 This standard is applicable to the service brake assembly and friction lining (lining block) assembly, for the category M1 passenger car, which is specified in GB/T 15089.

2 Normative references

The 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) is applicable to this standard.

GB/T 5620 Road vehicles - Braking of automotive vehicles and their trailers - Vocabulary

GB/T 15089 Classification of power-driven vehicles and trailers

QC/T 556 Automobile brake - Temperature measurement and thermocouple mounting

3 Terms and definitions

The terms and definitions as defined in GB/T 5620, as well as the following terms and definitions, apply to this standard.

3.1 Braking period

In the continuous braking process, the elapsed time, from the beginning of this braking to the beginning of the next braking.

Note. The unit of braking period is s.

3.2 Initial braking temperature

The temperature of the brake drum (disc) or friction lining (lining block), at the start of braking.

Note. The unit of initial braking temperature is °C.

4 Performance requirements

4.1 Brake performance test

4.1.1 The first efficiency test

Carry out the test according to 7.1.2. When the initial braking speed is 100 km/h [For vehicle, whose Vmax (Vmax is the highest design speed of the car, the same below) less than 100 km/h, it is Vmax], the average braking torque of the sample, under the specified braking pressure, shall not be lower than 80% of the lower design limit (where there is no lower design limit, it shall not be lower than 72% of the design value OR as negotiated by both parties).

4.1.2 The first room temperature efficiency test

Carry out test according to 7.1.4. The average braking torque of the sample, under the specified braking pressure, shall not be lower than 75% of the average braking torque, under the same braking pressure as the corresponding initial braking speed, in the second efficiency test.

4.1.4 Failure test of piping system (optional)

Carry out test according to 7.1.7. When the braking pressure is the rated braking pressure, the average braking deceleration of the sample shall not be less than 3.0 m/s².

4.1.8 The third efficiency test

Same as 4.1.3.

4.1.9 Braking noise

During the test process of 7.1, the braking noise value of the sample shall be less than 76dB (A).

4.1.10 Sample requirements after test

After completing the test of 7.1, the brake shall work normally AND meet the following requirements.

4.2 Abrasion test of brake

4.2.1 Abrasion requirements

4.2.1.1 The abrasion of brake friction linings (lining block) and brake drums (disks) shall be negotiated between the supplier and the buyer.

5 Test-related requirements

5.1 Test equipment

5.1.1 The test equipment is an inertial brake test bench (both single and double wheels are acceptable). Its performance indicators shall meet the test requirements of this standard.

5.1.5 The test equipment shall be able to continuously record the following parameters. The measurement error shall meet the following requirements.

5.1.6 The device and thermocouple, which are used for measuring the temperature of the brake drum (disc) and friction lining (lining block), shall comply with the relevant requirements in QC/T 556.

5.1.7 The accuracy grade of the instrument or meter, which indicates each parameter, shall not be lower than grade 2.5.

5.2 Other requirements

5.2.1 All test vehicle speeds shall be rounded off to an integral multiple of 5.

5.2.5 For all tests, which are carried out according to the brake deceleration control, it shall use the formula (12) to convert the brake deceleration into the braking torque control value of the test bench.

5.2.6 The radial runout of the brake drum, after installation (measured at the middle of the width direction of the friction surface of the brake drum), shall not be greater than 0.2 mm

6 Test preparation

6.1 Thermocouple installation

Install the thermocouple, according to the relevant requirements in QC/T 556.

6.2 Determination of the spindle speed of test bench

The spindle speed of the test bench is determined according to formula (6).

6.4 Conversion of braking deceleration and braking torque

The braking deceleration, which is required by the test, is converted into the braking torque control value of the test bench, according to formula (12).

7 Test method

7.1 Brake performance test

7.1.2 The first efficiency test

7.1.2.1 The initial braking temperature is (80 ± 2) °C.

7.1.2.2 The initial braking speed is 30% Vmax BUT not higher than 80 km/h and 100 km/h (For vehicles, whose Vmax is less than 100 km/h, it is Vmax).

7.1.3 Running-in test

7.1.3.1 The initial braking temperature shall not be higher than 120 °C.

7.1.3.2 The initial braking speed is as follows.

7.1.3.3 The braking deceleration is 3.5 m/s².

7.1.4 The first room temperature efficiency test

7.1.4.1 The initial braking temperature shall not be higher than 45 °C.

7.1.4.2 The initial braking speed is 30%Vmax, BUT not higher than 80 km/h.

7.1.5 The second efficiency test

For vehicles, whose Vmax is not higher than 125 km/h, it is the same as 7.1.2.

For vehicles, whose Vmax is higher than 125 km/h, increase the initial braking speed of 80% Vmax, BUT not higher than 160 km/h.

7.1.6 The second running-in test

Except that the number of braking operations is 20, the rest is the same as 7.1.3.

7.1.8 The third running-in test

Same as 7.1.6.

7.1.9 The first fading recovery test

7.2

7.2.3 Running-in test

Same as 7.1.6.

7.2.5 Inspection of braking efficiency

After the end of the abrasion test, carry out the running-in test according to 7.1.6. Then carry out the efficiency test according to 7.1.5.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 24 pages — is available in the English PDF.

Referenced standards

Normative references

Similar standards

QC/T 316-2017|QC/T 237-2022|QC/T 237-1997|GB/T 41327-2022|GB/T 5334-2021|GB/T 33829-2017

Editions of QC/T 564

Edition	Title	Revision	Status
QC/T 564-2018	Performance requirements and bench test methods for passenger car service brakes	current edition	Current
QC/T 564-2008	Performance requirements and bench test methods for passenger car service brakes	previous edition	Superseded

This page sells the current edition, QC/T 564-2018. Earlier editions are listed for reference only.

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