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GB/T 37224-2018Drum brake linings for automobiles (English PDF)

汽车用鼓式制动片

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

December 28, 2018

Implementation date

November 1, 2019

Scope

GB/T 37224-2018 is the English-translated version of 汽车用鼓式制动片.

China's national standard for automotive drum brake linings. It specifies the terms and definitions, the requirements, the test methods and the inspection rules.

The drum brake has been displaced by the disc on front axles everywhere and on most rear axles, but it survives in commercial vehicles, on trailers and as a parking brake, and it does two things a disc does not.

It is self-energising: the rotation of the drum drags the leading shoe harder against it, which multiplies the applied force and is why a drum needs less pedal effort or less servo.

And it is enclosed, so it keeps out water and dirt and holds its parking brake force without the caliper mechanism a disc needs. Its weakness is heat, since the drum expands away from the shoes as it warms and the friction surface is buried where air cannot reach it.

The lining's requirements therefore turn on how its friction coefficient holds as temperature rises, which is what fade means and what the test methods measure.

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Document preview — GB/T 37224-2018

National Standard of the People's Republic of China

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword3
1 Scope4
2 Normative references4
3 Terms and definitions5
4 Requirements7
5 Test methods8
6 Inspection rules9
7 Marking, packaging, transportation and storage11

Foreword

NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA ICS 43.040.40 Q 69

# GB/T 37224-2018 # Drum brake linings for automobile

1 Scope

This Standard specifies the terms and definitions, requirements, test methods,

inspection rules, marking, packaging, transportation and storage of drum brake linings

for automobiles (hereinafter referred to as “braking linings”).

This Standard applies to drum brake linings for vehicles of categories M, N and O.

2 Normative references

The following referenced documents are indispensable for the application of this

document. For dated references, only the edition dated applies to this document. For

undated references, the latest edition of the referenced documents (including all

amendments) applies to this document.

GB/T 2828.1, Sampling procedures for inspection by attributes – Part1. Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection (GB/T 2828.1-2012, ISO 2859-1.1999, IDT)

GB/T 5620, Road vehicles – Braking of automotive vehicles and their trailers – Vocabulary (GB/T 5620-2002, idt ISO 611.1994)

GB 5763-2018, Brake linings for automobiles

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

GB/T 26739, Road vehicles – Brake linings – Test method for internal shear strength of lining material

GB/T 33835, Test method of impact strength for friction material JC/T 685, Test method for density of friction material JC/T 2103-2012, Road vehicles – Brake linings friction materials – Visual inspection (JC/T 2103-2012, ISO/PAS 22574.2007, IDT)

QC/T 239, Specifications and bench test methods for commercial vehicle service brake category N

Remaining clauses in the full document

3 Terms and definitions
3.3 category O
4 Requirements
5 Test methods
5.3 Basic requirements concerning health and safety
5.4 Impact strength test
5.5 In-plane shear strength test
5.6 Density
5.7 Braking performance test
6 Inspection rules
6.1 Inspection classification
7 Marking, packaging, transportation and storage

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 2859 · ISO 611.1994

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