GB/T 26741-2023 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 26741-2023 | English | 215 |
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Brake linings for motor tricycle
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| GB/T 26741-2011 | English | 279 |
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Brake linings for motor tricycle
| Obsolete |
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GB/T 26741-2023: Brake linings for motor tricycle---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT26741-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.40
CCS Q 69
Replacing GB/T 26741-2011
Brake Linings for Motor Tricycle
ISSUED ON: DECEMBER 28, 2023
IMPLEMENTED ON: JULY 1, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 5
4 Classification ... 6
5 Requirements ... 6
6 Test Methods ... 8
7 Inspection Rules ... 9
8 Markings, Packaging, Transportation and Storage ... 11
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives
for Standardization - Part 1: Rules for the Structure and Drafting of Standardizing Documents.
This document serves as a replacement of GB/T 26741-2011 Brake Linings for Motor Tricycle.
In comparison with GB/T 26741-2011, apart from structural adjustments and editorial
modifications, the main technical changes are as follows:
a) The content of “Terms and Definitions” is modified (see Chapter 3; Chapter 3 of
Version 2011);
b) The requirements for “friction performance” are modified (see 5.3; 5.3 of Version
2011);
c) The requirements for “shear strength” at room temperature are modified, and the
requirements at high temperatures are added (see 5.4; 5.4 of Version 2011);
d) The requirements for “limit of harmful ingredients” are added (see 5.5);
e) The test method for “friction performance” is modified (see 6.3; 6.3 of Version 2011);
f) The test method for “limit of harmful ingredients” is added (see 6.5);
g) The requirements for “exit-factory inspection” and “type inspection” are added (see
7.1.1 and 7.1.2);
h) The requirements for batch grouping principle, sampling and result determination in
“Inspection Rules” are modified (see 7.1.3, 7.2 and 7.3; Chapter 7 of Version 2011);
i) The content of markings is modified (see 8.1; 8.1 of Version 2011).
Please be noted that certain content of this document may involve patents. The institution
issuing this document does not undertake the responsibility of identifying these patents.
This document was proposed by China Building Materials Federation.
This document shall be under the jurisdiction of National Technical Committee on Nonmetallic
Mineral Products of Standardization Administration of China (SAC/TC 406).
The drafting organizations of this document: Xianyang Non-metallic Mineral Research and
Design Institute Co., Ltd.; China National Geological Exploration Center of Building Materials
Industry; Zhejiang Wansai Auto Parts Co., Ltd.; Hebei Shuanghu Vehicle Parts Co., Ltd.; Hebei
Xingyue Braking Element Co., Ltd.; Gucheng County Saizhishun Braking Components Co.,
Ltd.; Shandong Rubrake Auto Parts Co., Ltd.; Zhejiang Naimoda Technology Co., Ltd.; Hebei
Zhengda Friction Brake Material Co., Ltd.
Brake Linings for Motor Tricycle
1 Scope
This document specifies the classification, requirements, test methods, inspection rules,
markings, packaging, transportation and storage of brake linings for motor tricycle.
This document is applicable to brake linings for motor tricycle (hereinafter referred to as “the
linings”).
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 2828.1 Sampling Procedures for Inspection by Attribute - Part 1: Sampling Schemes
Indexed by Acceptance Quality Limit (AQL) for Lot-by-lot Inspection
GB/T 5620 Road Vehicles - Vocabulary and Definition for Braking of Automotive Vehicles and
Their Trailers
GB 5763 Brake Linings for Automobiles
GB/T 17469 Characteristics Evaluation of Brake Linings for Automobile - Small Sample Bench
Test Method
GB/T 22309 Road Vehicles - Brake Linings - Shear Test Method for Disc Brake Pad and Drum
Brake Shoe Assemblies
GB/T 23263 Determination of Asbestos in Products
GB/T 34007-2017 Road Vehicles - Brake Lining Friction Materials - Drag Test Method for
Friction Performance
JC/T 2268 Measurement of Copper and Other Elements in Brake Friction Materials
QC/T 944 Test Method for Poly-brominated Biphenyls (PBBs) and Poly-brominated Diphenyl
Ethers (PBDEs) in Automobile Materials
3 Terms and Definitions
The terms and definitions defined in GB/T 5620 and GB 5763 are applicable to this document.
5.3 Friction Performance
5.3.1 The small sample bench test results of Category-1 linings shall comply with the following
requirements:
---Room-temperature friction coefficient room-temperature is not lower than 0.25, and complies
with the indicated level;
---High-temperature friction coefficient high-temperature is not lower than 0.25, and complies
with the indicated level;
---The friction coefficient at any point in the second recession 93 C ~ 288 C temperature
section and the second recovery 149 C ~ 93 C temperature section of five tests is not
lower than 0.15, and the difference between the friction coefficient value at each
temperature point and the average value of the five tests does not exceed 20%.
5.3.2 The friction performance drag test results of Category-2 linings shall comply with the
following requirements:
---The working friction coefficient working is within the range of 15% the set friction
coefficient value;
---After the test, there is no delamination or falling-off of the linings.
5.4 Shear Strength
The shear strength of bonded linings at room temperature (23 5) C shall not be less than 3.0
MPa. After the shear test, the area of friction material remaining on the backing plate shall not
be less than 80%.
The shear strength of bonded linings at high temperature (300 10) C shall not be less than
2.0 MPa.
5.5 Limit of Harmful Ingredients
5.5.1 The linings shall not contain asbestos.
5.5.2 Other harmful elements in the linings shall not exceed the limit requirements specified in
Table 3.
6.5.2 The determination of lead, mercury, cadmium and hexavalent chromium contents shall be
carried out in accordance with the stipulations of JC/T 2268.
6.5.3 The determination of polybrominated biphenyls and polybrominated diphenyl ether
contents shall be carried out in accordance with the stipulations of QC/T 944.
7 Inspection Rules
7.1 Inspection Classification
7.1.1 Exit-factory inspection
The exit-factory inspection items include appearance, dimensions, friction performance and
shear strength (the bonded type).
7.1.2 Type inspection
The type inspection items are all items specified in Chapter 5. Under one of the following
circumstances, type inspection shall be carried out:
a) When new products are put into production or product type appraisal is conducted;
b) During normal production, once a year;
c) When there are significant changes in raw materials, production processes and
equipment, etc., which may affect product quality;
d) When production has been suspended for more than one year, and then, resumed;
e) When the exit-factory inspection results are significantly different from the previous
type inspection results.
7.1.3 Batch grouping principle
The actual delivered quantity of linings with the same formula, same process and same month
is considered as one batch. When the batch size is too large, it can also be divided into several
small batches.
7.2 Sampling
7.2.1 The appearance and dimensions of the linings shall adopt the method of random sampling.
In accordance with the stipulations of single sampling plan for normal inspection in GB/T
2828.1, conduct sampling. Take the special inspection level of S-4 and the AQL value of 2.5.
The sample size, acceptance number or rejection number of different batches shall comply with
the stipulations of Table 7.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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