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GB/T 37336-2019

Chinese Standard: 'GB/T 37336-2019'
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Standard ID GB/T 37336-2019 (GB/T37336-2019)
Description (Translated English) Brake drum of automobile
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard T24
Classification of International Standard 43.040.40
Word Count Estimation 14,133
Date of Issue 2019-03-25
Date of Implementation 2019-10-01
Drafting Organization National Motor Vehicle Parts Quality Supervision and Inspection Center, Shandong Longji Machinery Co., Ltd., Yantai Resort Auto Parts Manufacturing Co., Ltd., Shandong Jinqilin Co., Ltd., Shandong Yudong Auto Parts Co., Ltd., Yantai Meifeng Machinery Co., Ltd., Yantai Hongtian Auto Parts Co., Ltd.
Administrative Organization National Automotive Standardization Technical Committee (SAC/TC 114)
Regulation (derived from) National Standard Announcement No. 3 of 2019
Proposing organization Ministry of Industry and Information Technology of the People
Issuing agency(ies) State Administration of Markets and China National Standardization Administration

GB/T 37336-2019
ICS 43.040.40
T 24
Brake drum of automobile
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Classification ... 5 
5 Technical requirements ... 6 
6 Inspection methods ... 9 
Appendix A (Normative) Bench test methods of brake drum ... 12 
Brake drum of automobile
1 Scope
This Standard specifies the terms and definitions, classification, technical
requirements, and inspection methods for brake drum of automobile.
This Standard is applicable to the brake drums, whose body material is gray
cast iron, for service brakes of types M and N vehicles specified in GB/T 15089-
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.
GB/T 223.3 Methods for chemical analysis of iron, steel and alloy - The
diantipyrylmethane phosphomolybdate gravimetric method for the
determination of phosphorus content
GB/T 223.58 Methods for chemical analysis of iron, steel and alloy - The
sodium arsenite-sodium nitrite titrimetric method for the determination of
manganese content
GB/T 223.59 Iron, steel and alloy - Determination of phosphorus content -
Bismuth phosphomolybdate blue spectrophotometric method and antimony
phosphomolybdate blue spectrophotometric method
GB/T 223.60 Methods for chemical analysis of iron, steel and alloy - The
perchloric acid dehydration gravimetric method for the determination of
silicon content
GB/T 223.62 Methods for chemical analysis of iron, steel and alloy - The
butyl acetate extraction photometric method for the determination of
phosphorus content
GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The
sodium (potassium) periodate photometric method for the determination of
manganese content
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at
room temperature
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method
GB/T 1031 Geometrical product specifications (GPS) - Surface texture:
Profile method - Surface roughness parameters and their values
GB/T 1958 Geometrical Product Specifications (GPS) - Geometrical
tolerance - Verification
GB/T 3177 Geometrical product specifications (GPS) - Inspection of plain
workpiece sizes
GB/T 7216 Metallographic test for gray cast iron
GB/T 9239 (all parts) Mechanical vibration - Rotor balancing
GB/T 9439-2010 Grey Iron Castings
GB/T 20123 Steel and iron - Determination of total carbon and sulfur content
- Infrared absorption method after combustion in an induction furnace
(routine method)
QC/T 556 Automotive brake temperature measurement and thermocouple
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Mounting spigot hole
A center hole which mates with the hub.
3.2 Mounting surface
The surface of the brake drum which fits the hub.
3.3 Limiting wear size
The maximum radial size allowed after the friction surface of brake drum is worn.
4 Classification
4.1 Classification of brake drum
the thermal fatigue test in accordance with A.4.1.1, shall not fail. Brake drum samples for type M2, M3, N2, and N3 vehicles shall be tested
in accordance with A.4.1.2. It shall meet one of the following requirements:
a) The number of thermal fatigue test cycles when the brake drum sample
fails is greater than or equal to 300;
b) When the number of thermal fatigue test cycles when the brake drum
sample fails is greater than 250, but less than 300, the test is repeated
using a new brake drum sample. The number of thermal fatigue test cycles
of both samples is greater than 250.
5.9.2 High load test
Brake drum samples, after completion of the high load test in accordance with
A.4.2, shall not fail.
6 Inspection methods
6.1 Mechanical properties
6.1.1 Tensile strength
Samples for tensile strength shall be taken from the middle of the friction
surface of brake drum. The sampling position is shown in Figure 3. If there are
special requirements, it can be agreed between the supplier and the purchaser.
The testing method of tensile strength shall be in accordance with the provisions
of GB/T 228.1.
Figure 3 -- Schematic diagram of sampling position of sample for tensile
In the case where the tensile strength sampling size is limited, the wedge
pressure strength can be used instead of the tensile strength. The size of the
wedge sample shall comply with the requirements of Table 6. For the
conversion method of wedge pressure strength and tensile strength, see
Appendix D of GB/T 9439-2010. The wedge pressure strength is the average
Sampling position
Appendix A
Bench test methods of brake drum
A.1 Scope
This appendix specifies the test related requirements, failure criteria, and test
methods for the bench tests such as thermal fatigue test and high load test of
brake drum.
A.2 Test related requirements
A.2.1 Moment of inertia
The actual inertia setting shall be as close as possible to the theoretical inertia.
The deviation shall be within the range of ±5% of the theoretical inertia. The
theoretical inertia refers to the inertia distributed on the corresponding wheel of
the total inertia generated when the vehicle is braked. It shall be calculated
according to formula (A.1).
I - Moment of inertia, in kilograms of square meters (kg • m2);
m - Test mass (the mass of the vehicle’s maximum design total mass distributed
on the corresponding wheel when braking), in kilograms (kg);
r - Tire rolling radius, in meters (m).
A.2.2 Test mass
A.2.2.1 For vehicles with a maximum design total mass of less than 7500 kg,
the test mass shall be calculated according to formula (A.2) or formula (A.3).
b) The hydraulic brake is 25 MPa/s±5 MPa/s.
A.2.5 Sampling rate
The sampling rate of brake line pressure and braking torque shall be greater
than 20 Hz.
A.2.6 Temperature measurement
The thermocouple mounting position is at the center radius of the friction track
of brake lining contact surface. The temperature measurement shall meet the
requirements of QC/T 556.
A.2.7 Sample and other brake requirements
The test shall use a new brake drum and a new brake lining. The friction surface
of brake drum shall be clean. Brake linings and other brake parts shall be
original parts. There is no grease or other foreign matter on the brake lining
surface. During the test, the brake lining, when worn to the limit, is allowed to
be replaced.
Related standard: GB/T 38185-2019    GB/T 38186-2019
Related PDF sample: GB/T 38185-2019    GB/T 38186-2019