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GB 5763-2008 English PDF (GB5763-2008)

GB 5763-2008 English PDF (GB5763-2008)

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GB 5763-2008: Brake linings for automobiles

This Standard specifies the terms and definitions, classification, technical requirements, test methods, inspection rules, marks, packaging, transportation and storage of the brake linings for automobiles. This Standard applies to the brake linings for automobiles.
GB 5763-2008
GB
ICS 43.040.40
Q 69
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
Replacing GB 5763-1998
Brake linings for automobiles
ISSUED ON. SEPTEMBER 18, 2008
IMPLEMENTED ON. SEPTEMBER 10, 2009
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the PEOPLE Republic of China;
Standardization Administration of the PEOPLE Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Classification ... 6
5 Technical requirements ... 7
6 Test methods ... 9
7 Inspection rules ... 15
8 Marks, packaging, transportation and storage ... 17
Foreword
The Sections 5.3 and 5.4 of this Standard are mandatory, while other
sections are recommended.
The consistent degree between this Standard and JIS D4411-1993 (confirmed in 2006) Brake linings and pads for automobiles is not equivalent.
This Standard replaces GB 5763-1998 Brake linings for automobiles.
Compared with the GB 5763-1998, the major modifications of this Standard are as follows.
?€? ADD the ?€?Terms and definitions?€?.
?€? MODIFY the technical specifications given in Tables 3, 4, 5 and 6 of the Section 5.3 in this Standard. The details are as follows.
a) MODIFY the allowable deviation of the coefficient appointed in Table 3 from ?€??? 0.12?€? to ?€??? 0.10?€?. Respectively MODIFY the wear from ?€?2.00,
3.00?€? to ?€?1.50, 2.00?€?.
b) MODIFY the coefficient of friction in Table 4 from ?€?0.15~0.70?€? to
?€?0.20~0.70?€?. MODIFY the allowable deviation of the coefficient
appointed from ?€??? 0.12?€? to ?€??? 0.10?€?. MODIFY the wear from ?€?2.00?€? to
?€?1.50?€?.
c) MODIFY the coefficient of friction in Table 5 from ?€?0.15~0.70?€? to
?€?0.20~0.70?€?. Respectively MODIFY the allowable deviation of the
coefficient appointed from ?€??? 0.12, ?? 0.14?€? to ?€??? 0.10, ?? 0.12?€?. MODIFY the wear from ?€?3.00?€? to ?€?2.00?€?.
d) MODIFY the coefficient of friction in Table 6 from ?€?0.20~0.70?€? to
?€?0.25~0.70?€?. Respectively MODIFY the allowable deviation of the
coefficient appointed from ?€??? 0.12, ?? 0.14?€? to ?€??? 0.10, ?? 0.12?€?.
Respectively MODIFY the wear from ?€?2.50, 3.50?€? to ?€?2.00, 2.50?€?.
?€? ADD the technical requirements and corresponding test methods for the shear strength, impact strength, swell, and compressive strain.
?€? RECOMPILE the inspection rules. ADD the contents and items of the type inspection.
This Standard was proposed by China Building Materials Federation.
Brake linings for automobiles
1 Scope
This Standard specifies the terms and definitions, classification, technical requirements, test methods, inspection rules, marks, packaging, transportation and storage of the brake linings for automobiles.
This Standard applies to the brake linings for automobiles (hereinafter referred to as ?€?linings?€?).
2 Normative references
The provisions in the following documents become the provisions of this Standard through reference in this Standard. For dated references, the
subsequent amendments (excluding corrections) or revisions do not apply to this Standard. However, parties who reach an agreement based on this
Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest versions apply to this Standard. GB/T 2828.1 Sampling procedures for inspection by attributes ?€? Part 1.
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection (GB/T 2828.1-2003, ISO 2859-1.1999, IDT)
GB/T 22309 Road vehicles ?€? Brake linings ?€? Shear test procedure for disc brake pad and drum brake shoe assemblies (GB/T 22309-2008, ISO
6312.2001, IDT)
GB/T 22310 Road vehicles ?€? Brake linings ?€? Effects of heat on dimensions and form of disc brake pads ?€? Test procedure (GB/T 22310-2008, ISO
6313.1980, IDT)
GB/T 22311 Road vehicles ?€? Brake linings ?€? Compressive strain test method (GB/T 22311-2008, ISO 6310.2001, IDT)
JB/T 7498 Coated abrasives ?€? Abrasive paper
JC/T 1065 Constant speed friction test machine
3 Terms and definitions
The following terms and definitions apply to this Standard.
3.1 Coefficient of friction (??)
It refers to the ratio OF friction (f) TO the normal force (F) applied to the test specimen.
3.2 Coefficient appointed (??a)
It refers to the value of friction coefficient agreed upon by the supply and requisitioning parties of linings.
3.3 Wear (V)
It refers to the ratio OF wear volume loss TO friction work of linings under the specified conditions.
3.4 Shear strength
It refers to the ratio OF the force which is parallel to the rear plate of the disc brake pad or the edge surface of the drum brake shoe, and can completely shear the lining materials with the rear plate or shoe plate TO the shear geometric area of the lining materials.
3.5 Swell
It refers to the ratio OF the increment of the heated thickness of the lining TO the initial thickness of the lining.
3.6 Impact strength
It refers to the ratio OF the impact energy consumed during the fracture of the test sample TO the cross-sectional area at the fracture of the test sample. 4 Classification
According to the applications, the linings are divided into four categories. SEE Table 1.
Table 1 Lining Classification
Classification Applications Classification Applications
Class I For the parking brakes Class III For the drum brakes of medium-sized and heavy vehicles Class II For the drum brakes of mini and light vehicles Class IV For the disc brakes 5.6 Coefficient of thermal expansion
For the Class IV linings, the coefficient of thermal expansion at 400??C ?? 10??C shall not be greater than 2.5%.
5.7 Compressive strain
For the Class IV linings, the compressive strain at room temperature shall not be greater than 2%, while the compressive strain at 400??C ?? 10??C shall not be greater than 5%.
6 Test methods
6.1 Appearance quality inspection
USE the visual observation and knocking methods for appearance quality
inspection.
6.2 Dimension measurement
USE a vernier caliper with the accuracy of 0.02mm to measure the width and thickness dimensions.
6.3 Friction property test
6.3.1 Test specimen
6.3.1.1 PREPARE two test specimens from the working surface of the same lining.
6.3.1.2 The dimensions of the test specimens are 25mm ?? 25mm. The
allowable deviation is within the range of -0.2mm ~ 0mm.
6.3.1.3 The thickness of the test specimens is within the range of 5mm to 7mm. The thickness difference between two test specimens shall below 0.2mm. If the product thickness is less than 5mm, its original thickness will apply. 6.3.2 Test equipment
The test equipment shall conform to the provisions specified in the standard JC/T 1065.
6.3.3 Test conditions
6.3.3.1 The pressure applied to the test specimens shall be 0.98MPa.
6.3.3.2 The disk materials shall conform to the provisions specified in the JC/T 1065. USE the abrasive paper with the granularity of P240 specified in the JB/T 7498 to process the disk surfaces, so as to ensure that there are no defects on the disk surfaces, such as obvious scratches, rust, pits, etc.
6.3.3.3 The friction direction shall be the same with that of the linings. 6.3.4 Test procedures
PLACE two test specimens in the support arm of the test specimens.
CONDUCT the test according to the following order.
6.3.4.1 RUN in the test specimens below 100??C, until the contact surface is up to more than 95%. USE a micrometer with the accuracy of 0.01mm to
measure the thickness of the test specimens. DETERMINE the thickness after the test specimens cool down to room temperature. MEASURE 5 points on
each test specimen. TAKE the arithmetic mean.
6.3.4.2 When the test temperature is at 100??C, DETERMINE the friction when the disk rotates at 5,000rpm according to the requirements specified in the Section 6.3.3 of this Standard. After the friction test, MEASURE the thickness of the test specimens according to the Section 6.3.4.1 of this Standard. 6.3.4.3 At the test temperature of 150??C, 200??C, 250??C, 300??C and 350??C, respectively CONDUCT the same test according to the Section 6.3.4.2 of this Standard. However, the maximum test temperatures of various linings shall conform to the provisions specified in Tables 3 to 6. When conducing the test at various temperatures, the disk temperature shall rise up to the specified test temperature within 1,500rpm. The increase of the disk temperature mainly relies on the friction heat of the test specimens. When the disk temperature cannot come up to the specified test temperature within 1,500rpm, it is allowed to use an auxiliary heating device.
6.3.4.4 After determining the maximum test temperature, DECREASE the
disk temperature by 50??C every time from the maximum test temperature,
DETERMINE the friction when the disk rotates at 1,500rpm afterwards, until the disk temperature decreases to 100??C. The temperature decrease from the
upper stage to the next stage shall be accomplished within 500 revolutions. 6.3.4.5 After the test, USE the visual observation method to inspect the appearance of the test specimens and the dis...

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