QC/T 556-2023 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| QC/T 556-2023 | English | 360 |
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Temperature measurement methods and thermocouple installation requirements for automobile brakes
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| QC/T 556-1999 | English | 120 |
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Automobile Brake Temperature Measurement and Thermocouple Mounting
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QC/T 556-2023: Temperature measurement methods and thermocouple installation requirements for automobile brakes
---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/QCT556-2023
QC
AUTOMOTIVE INDUSTRY STANDARD
ICS 43.040.40
CCS T 24
Replacing QC/T 556-1999
Temperature measurement methods and thermocouple
installation requirements for automotive brakes
Issued on. APRIL 21, 2023
Implemented on. NOVEMBER 01, 2023
Issued by. Ministry of Industry and Information Technology of PRC
Announcement of Ministry of Industry and Information Technology
of the People's Republic of China
No.7, 2023
Table of Contents
Foreword... 6
1 Scope... 8
2 Normative references... 8
3 Terms and definitions... 8
4 Measuring devices... 9
5 Thermocouple installation... 10
6 Installation of infrared thermometer... 16
7 Measurement methods... 17
Appendix A (Informative) Commonly used thermocouple structural types... 19
Foreword
This document is drafted in accordance with the provisions of GB/T 1.1-2020
"Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents".
This document replaces QC/T 556-1999 "Temperature measurement methods and
thermocouple installation requirements for automotive brakes". Compared with QC/T
556-1999, in addition to structural adjustments and editorial changes, the main technical
changes are as follows.
a) ADD a "Terms and definitions" chapter (see Chapter 3);
b) ADD "Measuring device for contact temperature measurement method", detailing
the requirements for thermocouples and thermocouple selection (see 4.1);
c) ADD "Measuring device for non-contact thermometry", detailing the
requirements for infrared thermometers (see 4.2);
d) CHANGE the indication error requirements for “display and recording devices”
(see 4.3; 1.2 of the 1999 edition);
e) CHANGE the specific requirements for the installation of embedded
thermocouples on the brake lining assembly (see 5.1.1; 2.1 of the 1999 edition);
f) CHANGE the specific requirements for the installation of embedded
thermocouples on the brake drum (disc) (see 5.1.2; 2.2 of the 1999 edition);
g) CHANGE the specific requirements for the installation of embedded
thermocouples when measuring brake fluid temperature (see 5.1.3; 2.3 of the
1999 edition);
h) ADD the specific requirements for the installation of rubbing thermocouples (see
5.2);
i) ADD a chapter "Installation of infrared thermometer", describing the installation
steps and requirements (see Chapter 6);
j) CHANGE the specific requirements for "measurement preparation" (see 7.1; 3.1
of the 1999 edition);
k) CHANGE the specific requirements for "Temperature measurement" (see 7.2; 3.2
of the 1999 edition);
1) DELETE the relevant content of "Temperature compensation when the free end
of the thermocouple is not 0 °C" (3.3 of the 1999 edition);
m) DELETE "Standard thermocouple technical data" and "Five thermocouple K
value tables" (Appendix A and Appendix B of the 1999 edition);
n) ADD "Commonly used thermocouple structural types" (see Appendix A).
Please note that some content in this document may be subject to patents. The publisher
of this document assumes no responsibility for identifying patents.
This document was proposed by AND shall be under the jurisdiction of the National
Automotive Standardization Technical Committee (SAC/TC 114).
Drafting organizations of this document. Zhejiang Asia-Pacific Mechanical and
Electrical Co., Ltd., China FAW Motor Co., Ltd., Dongfeng Motor Group Co., Ltd.,
Wanxiang Qianchao Co., Ltd., Ruili Group Ruian Auto Parts Co., Ltd., Xiangyang
Da'an Automobile Inspection Center Co., Ltd., Anji Asia Pacific Braking Systems Co.,
Ltd., BAIC Motor Co., Ltd.
The main drafters of this document. Li Xuejia, Zheng Dongming, Wang Shishuang, Ye
Xiaoming, Wu Huojuan, Xiong Zhiqiang, Hu Dexiang, Wang Wei, Hong Qingliang.
This standard replaces the standard previously issued as follows.
- It was first released in 1985 as JB 3936-1985;
- In 1999, the original standard number was converted into the industry standard
number QC/T 556-1999, with the content remained unchanged;
- This is the first revision.
Temperature measurement methods and thermocouple
installation requirements for automotive brakes
1 Scope
This document specifies the terms and definitions, measurement devices, thermocouple
installation, infrared thermometer installation, measurement methods for automotive
brake temperature measurement.
This document applies to temperature measurement during automotive brake testing.
2 Normative references
The contents of the following documents constitute essential provisions of this
document through normative references in the text. Among them, for dated reference
documents, only the version corresponding to the date applies to this document; for
undated reference documents, the latest version (including all amendments) applies to
this document.
GB/T 5620 Road vehicles - Vocabulary and definition for braking of automotive
vehicles and their trailers
GB/T 16839.1 Thermocouples - Part 1.EMF specifications and tolerances
GB/T 30429 Industrial thermocouple assemblies
JB/T 5582 Specification of industrial sheathed thermocouple assemblies
3 Terms and definitions
The terms and definitions as defined in GB/T 16839.1 and GB/T 5620, as well as the
following terms and definitions, apply to this document.
3.1
Contact thermometry
A temperature measurement method, in which the temperature detection element is
in contact with the measured object and reaches thermal equilibrium.
Note. Commonly used contact thermometry includes thermocouple temperature
measurement method, resistance temperature measurement method, etc.
3.2
Non-contact thermometry
A temperature measurement method, in which the temperature detection element
does not come into contact with the object being measured.
Note. Commonly used non-contact thermometry includes radiation thermometry, spectral
thermometry, etc.
3.3
Embedded thermocouple
A thermocouple, whose measuring end is embedded inside the object being
measured.
4 Measuring devices
4.1 Measuring device for contact thermometry
4.1.1 Contact temperature measurement devices shall meet the following requirements.
4.1.2 See Appendix A for the structural types of commonly used thermocouples.
4.2 Measuring device for non-contact thermometry
4.3 Display and recording device
The device that displays and records the dynamic temperature of the brake shall meet
the following requirements.
5 Thermocouple installation
5.1 Embedded thermocouple
5.1.1 Installation on the brake lining assembly
5.1.1.3 Process a through hole, at the corresponding installation position (the hole
diameter is determined according to the outer diameter of the thermocouple measuring
end). Fix the thermocouple measuring end in the hole, without looseness. The distance
between the measuring end and the friction surface is (1 ± 0.2) mm. See Figure 1 and
Figure 2 for details.
5.1.2 Installation on the brake drum (disc)
5.1.2.1 For brake drums, the thermocouple's measuring end shall be installed at the
center of the width direction of the friction surface of the brake drum and avoid
Through hole φ2.9
structures such as heat dissipation ribs.
5.1.2.2 For brake discs, the installation position of the thermocouple's measuring end
shall be located at the effective friction radius of the brake disc, meanwhile avoid
ventilation ribs (ventilation coils), heat dissipation holes, surface grooves and other
structures.
5.1.3 Installation when measuring brake fluid temperature
5.1.3.1 The measuring end of the thermocouple is installed on the bleed screw of the
brake wheel cylinder.
5.1.3.2 Process a through hole along the axis of the bleed screw's drain hole (the hole
diameter is determined according to the outer diameter of the thermocouple's measuring
end; the size clearance fits).
5.2 Rubbing thermocouple
5.2.1 The installation position of the thermocouple's measuring end on the brake drum
is shown in Figure 5.
5.2.2 The installation position of the thermocouple's measuring end on the brake disc is
shown in Figure 6.
Through hole Φ3.1
5.2.3 After the position of the thermocouple's measuring end is determined, tighten the
mounting bracket. The position of the measuring end shall not be changed during the
test. After installation, the following requirements shall be met.
6 Installation of infrared thermometer
The installation steps when measuring brake disc temperature are as follows.
7 Measurement methods
7.1 Measurement preparation
7.1.1 Contact thermometry
7.1.2 Non-contact thermometry
7.1.2.1 According to the specific installation environmental conditions and test
conditions during automobile brake testing, install the measuring device according to
the requirements of Chapter 6.
7.1.2.2 Connect the temperature measuring instrument. Adjust the connecting wire
according to the length of the connection distance.
7.1.3 Before measurement, calibrate the measuring device (including display and
recording device) used.
7.2 Temperature measurement
7.2.1 Temperature measurement of brake lining assembly and brake drum (disc)
Turn on the recording instrument to record the temperature changes of the object being
measured during the braking process. If necessary, record the temperature changes
within a certain period of time, after the brake drum (disc) stops rotating.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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