GB/T 5620-2020Road vehicles - Vocabulary and definition for braking of automotive vehicles and their trailers (English PDF)

Foreword

This Standard is drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard replaces GB/T 5620-2002 "Road vehicles - Braking of

automotive vehicles and their trailers - Vocabulary". Compared with GB/T 5620-

2002, the main technical changes of this Standard are as follows.

- ADD endurance braking system and its control device types to the braking

systems (see 3.2.4);

- ADD terms and definitions of braking systems relating to transmission

means (see 4.2);

- Adjust the relevant terms of brake components to Clause 5 (see 5.5.1;

Clause 9 of the 2002 edition);

- ADD the terms and definitions of "categories of retarder" and "auxiliary

device consuming energy" (see 5.5.3.1, 5.14);

- Delete the term and definition of "non-continuous braking system" (see

7 (see 7.1; 9.5 of the 2002 edition);

- ADD "brake application", "brake actuation", "brake release", "actuation

threshold", "clamping", "brake release position", "braking performance",

"braking slip", "adhesion utilization", "compatibility", as well as terms and

definitions related to the coefficient of friction (see 9.2, 9.3, 9.4, 9.5, 9.6, 9.7,

9.8, 9.18, 9.19, 9.20, 9.21);

- LIST the terms related to pressures separately; ADD terms such as "cut-

out pressure" and "cut-in pressure" and their definitions (see Clause 10; 6.4

of the 2002 edition);

- ADD the terms and definitions of "graduated braking", "automatic braking",

"automatically commanded braking", "selective braking", "predominance",

"running clearance", "circuit" and "braking modulation" (see Clause 11).

This Standard, using translation method, is identical to ISO 611.2003 "Road

vehicles - Braking of automotive vehicles and their trailers - Vocabulary".

China's document which has a consistent correspondence with the international

document normatively referenced in this Standard is as follows.

- GB/T 3730.1-2001 Motor vehicles and trailers - Types - Terms and

definitions (ISO 3833.1977, MOD).

This Standard has made the following editorial changes.

- CHANGE the standard name to "Road vehicles - Vocabulary and definition

for braking of automotive vehicles and their trailers";

- REWRITE the definitions of some terms in accordance with Chinese

language conventions.

This Standard was proposed by Ministry of Industry and Information Technology

of the PRC.

This Standard shall be under the jurisdiction of National Technical Committee

of Auto Standardization (SAC/TC 114).

Drafting organizations of this Standard. Technical Center of China FAW Group

Co., Ltd., Guangdong Automotive Test Center Co., Ltd., Zhejiang VIE Science

& Technology Co., Ltd.

Main drafters of this Standard. Lin Dahai, Xiao Wenjian, Hou Zonggang, Liu

Jianguang, Wang Yufeng, Lv Zheng.

The previous editions of the standard replaced by this Standard were released

as follows.

- GB/T 5620.1-1985, GB/T 5620.2-1985;

- GB/T 5620-2002.

Road vehicles - Vocabulary and definition for braking

of automotive vehicles and their trailers

1 Scope

This Standard defines the principal terms used in relation to the braking and

braking equipment of motor vehicles and trailers as defined in ISO 3833.

2 Normative references

The following documents are indispensable for the application of this document.

For the dated references, only the editions with the dates indicated are

applicable to this document. For the undated references, the latest edition

(including all the amendments) are applicable to this document.

3 Braking systems and equipment - General

Braking system allowing the driver to control, directly or indirectly and in a

graduated manner, the speed of a vehicle during normal driving or to bring the

vehicle to a halt.

4 Classification of braking systems

Braking system in which the energy required for braking is supplied by one or

more compressed springs acting as an energy storage accumulator.

5 Braking system components

A braking system consists of connected devices which supply energy, control and

transmit that energy to the brakes and, if necessary, via supplementary devices on

the towing vehicle, to the brakes of a towed vehicle.

Friction brake in which the friction forces are produced between the

components attached to a fixed part of the vehicle and the faces of one (more)

discs.

6 Driver supporting control braking systems

Multi-wheel control where the group of wheels controlled by the common

command is restricted to those only on one side of the vehicle.

Multi-wheel control where the signal of a predetermined wheel controls the

system for all the wheels of the group.

7 Braking phenomena

Shallow crack in the surface, usually present in some numbers on the same lining.

Random braking performance differences that the driver observes and which

could affect the vehicle stability.

8 Brake lining tests

Test procedure consisting of one or more brake applications or the continuous

dragging of the brake to generate heat with the effect that differences in braking

performance, if any, can be observed.

9 Braking mechanics

Return of one or more braking system(s) to the deactivated condition.

Minimum braking performance required by regulations.

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