GB/T 34007-2017 PDF English
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Road vehicles - Brake lining friction materials - Drag test method for friction performance
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GB/T 34007-2017: Road vehicles - Brake lining friction materials - Drag test method for friction performance
---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/GBT34007-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.40
Q 69
Road vehicles - Brake lining friction materials -
Drag test method for friction performance
Issued on. JULY 12, 2017
Implemented on. JUNE 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 4
4 Test equipment... 5
5 Test type and test device... 6
6 Test procedures... 7
7 Report of results... 13
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Building Materials Federation.
This standard shall be under the jurisdiction of the National Non-metallic
Mineral Products and Products Standardization Technical Committee (SAC/TC
406).
Drafting organizations of this standard. Dongying Baofeng Auto Parts Co., Ltd.,
Jinan Jinqilin Brake System Co., Ltd., Taimington Friction Material Technology
(Shanghai) Co., Ltd., Fujian Huari Auto Parts Co., Ltd., Xiamen Lixingda Friction
Material Co., Ltd., Chongqing Hongyu Friction Products Co., Ltd., Shandong
Liangshan Shenli Auto Parts Co., Ltd., Ningguo Feiying Auto Parts Co., Ltd.,
Tonglu Yuxin Auto Parts Co., Ltd., Xianyang Non-Metallic Mineral Research and
Design Institute Co., Ltd., National Non-metallic Mineral Products Quality
Supervision Inspection center.
The main drafters of this standard. Chen Kewen, Tian Shiguo, Sun Peng, Zhen
Minghui, Zhang Jianli, Su Meizhen, Yang Lijun, Ye Jialing, Zhao Yong, Feng
Jingyou, Sun Qichun, Wang Xiaopeng, Shi Zhigang.
Road vehicles - Brake lining friction materials -
Drag test method for friction performance
1 Scope
This standard specifies the test equipment, test type, test device, test procedure,
result report of the friction performance test of the brake lining materials of road
vehicles using the drag test method.
This standard applies to the friction performance test of brake linings
(hereinafter referred to as linings) used in category M, N, O, L vehicles.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 5620 Road vehicles - Braking of automotive vehicles and their trailers
- Vocabulary (GB/T 5620-2002, idt ISO 611.1994)
GB/T 15089 Classification of power-driven vehicles and trailers
JB/T 7498 Coated abrasives - Abrasive paper
QC/T 556 Automotive brake - Temperature measurement and thermocouple
installation
3 Terms and definitions
The terms and definitions defined in GB/T 5620 and GB/T 15089 AND the
following terms and definitions apply to this document.
3.1
Braking cycle
A braking process which consists of several braking runs, each braking
operation consisting of 5 s braking and 10 s idling.
3.2
Constant pressure mode
The control method in which the pipeline pressure remains constant during
braking.
3.3
Constant torque mode
The control method in which the braking torque remains constant during
braking.
3.4
Initial brake rotor temperature
The temperature of the brake disc at the beginning of the first brake run of
each braking cycle.
3.5
Maximum brake rotor temperature
The temperature exceeded by the brake disc is not allowed during each
braking cycle.
4 Test equipment
4.1 The test equipment shall be capable of performing pre-set test procedures
and achieving automatic control.
4.2 The recording equipment shall be capable of continuously recording the
following parameters, the measurement accuracy shall meet the following
requirements.
4.3 The cooling during the test is air-cooled. The temperature of the cooling air
does not exceed 25 °C and is blown to the brake at a flow rate of (600 ± 60) m3/h.
4.4 The speed of the equipment’s main shaft shall be (660 ± 10) r/min when
idling, it shall be not less than 600 r/min at full load.
4.5 During the test, it should use the embedded thermocouple to measure the
temperature of the brake disc. The installation and measurement shall be in
accordance with QC/T 556.
4.6 The radial runout and axial runout of the brake disc during equipment
operation shall not exceed 0.08 mm.
5 Test type and test device
5.1 Test type
The test type is divided into the original sample test and the sampling method
test. The original sample test is to test the specimen of original size, the
sampling method test is to prepare the specimen into the sample block of the
specified size to perform test.
5.2 Test device for disc linings for categories M1, M2, N1, O1, O2, L vehicles
5.2.1 When performing the original sample test, the brake disc and brake caliper
used in the test shall be the brake disc and brake caliper according to the
drawings and technical documents.
5.2.2 When performing the sampling test, it shall install a fixed-type disc brake
caliper on the test machine, the piston diameter is 36 mm. The distance
between the center of the sample block and the center of the brake disc after
installation is 116.5 mm.
5.3 Test devices for disc linings and drum linings for categories M3, N2, N3,
O3, O4 vehicles
It shall install a fixed-type disc brake caliper on the test machine, which has a
piston diameter of 60 mm. The distance between the center of the sample block
and the center of the brake disc after installation is 108 mm.
6 Test procedures
6.1 Test procedure for disc linings for categories M1, M2, N1, O1, O2, L vehicles
6.1.1 Test preparation
6.1.1.1 Determination of test pressure and torque by original sample method
6.1.1.2 Determination of test pressure and torque by sampling method
The pressure per unit area of the friction surface of the sample block under
constant pressure mode is 75 N/cm2, the pressure of the brake pipeline is 0.89
MPa;
6.1.1.3 Treatment of the surface of brake disc
Before each test, the surface of the brake disc shall be treated by the sandpaper
which has a grain size of P240 or finer in JB/T 7498, so that the surface of the
brake disc has no obvious wear marks and rust; use a soft cloth and absolute
ethanol to remove the dust and oil stains from the surface of the brake disc.
6.1.1.4 Preparation of specimen
6.1.2 Run-in of the lining or sample block
The lining or sample block shall be run-in before the formal test, until the contact
area of the lining or sample block with the brake disc is not less than 80%.
6.1.3 Measurement of initial thickness and mass
Take out the linings or sample block that have been run-in, measure and record
the thickness of each measurement point of each lining or sample block,
accurate to 0.01 mm; weigh and record the mass of each lining or sample block,
accurate to 0.01 g.
6.1.4 Test procedure
6.1.4.1 Test procedure at constant pressure mode
The test procedure at constant pressure mode is as shown in Table 1.
6.1.4.2 Test procedure at constant torque mode
The test procedure at constant torque mode is as shown in Table 2.
6.1.5 Measurement of final thickness and mass
Remove the lining or sample block after test, follow the requirements of 6.1.3
to measure and record the thickness and mass.
6.2 Test procedure for disc linings and drum linings for categories M3, N2,
N3, O3, O4 vehicles
6.2.1 Test preparation
6.2.1.1 Determination of pressure
The pressure per unit area of the friction surface of the sample block is 75 N/cm2
and the pressure of the brake lining is 1.17 MPa.
6.2.2 Run-in of sample block
The lining or sample block shall be run-in before the formal test, until the contact
area of the sample block with the brake disc is not less than 80%. The surface
temperature of the brake disc during running-in shall not exceed 200 °C.
The procedure for run-in of sample block is as shown in the test number 1 (run-
in) in Table 3.
6.2.3 Measurement of initial thickness and mass
Take out the sample block that have been run-in, measure and record the
thickness of each measurement point of each sample block, accurate to 0.01
mm; weigh and record the mass of each sample block, accurate to 0.01 g.
6.2.4 Test procedure
The test procedure is as shown in Table 3.
6.2.5 Measurement of final thickness and mass
Remove the lining after test, follow the requirements of 6.2.3 to measure and
record the thickness and mass.
7 Report of results
7.1 Collection of working friction coefficient
7.1.1 In the constant pressure mode, the collection point (μB) of the working
friction coefficient is 1 s after each brake run, it is collected within the interval of
±1 s of this 1 s. The collection frequency is not less than 20 Hz, as shown in
Figure 4.
7.1.2 In the constant torque mode, the collection point (μB) of the working friction
coefficient is 1 s after the braking torque reaches 80% of the set value, it is
collected within the interval of ±1 s of this 1 s. The collection frequency is not
less than 20 Hz, as shown in Figure 5.
7.1.3 The working friction coefficient for each brake run is the average of the
friction coefficients collected in the interval of (1 ± 0.1) s.
Figure 4 -- Schematic diagram of the collection point of the working
7.2 Collection point of minimum friction coefficient (μmin) and maximum
friction coefficient (μmax)
7.2.1 In the constant pressure mode, the collection point of the minimum friction
coefficient is the minimum value of the friction coefficient from the start of each
brake run to the end of this brake run.
7.2.2 In the constant torque mode, the collection point of the minimum friction
coefficient is the minimum value of the friction coefficient from the end of 0.5 s
after the braking torque reaches 80% of the set value to the end of this brake
Time
7.4 Method of determining the minimum friction coefficient and the
maximum friction coefficient
The method of determining the minimum friction coefficient is to take the
minimum value of the minimum friction coefficient as collected from each brake
run [except for the test No.1 (run-in)] during the test.
7.5 Test report
The test report shall include basic information, test parameters, working friction
coefficient, maximum friction coefficient, minimum friction coefficient, thickness
wear record, weight wear record, surface condition of the lining and brake disc
after the test, etc.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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