QC/T 241-2024 PDF English
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| QC/T 241-2024 | English | 185 |
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Air leakage detection methods of automobile wheels for tubeless tires
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| QC/T 241-2011 | English | 260 |
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Air leakage test methods of automobile wheels for tubeless tires
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| QC/T 241-1997 | English | 319 |
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Air leakage test methods of automobile wheels for tubeless tires
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QC/T 241-2024: Air leakage detection methods of automobile wheels for tubeless tires---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/QCT241-2024
QC
AUTOMOTIVE INDUSTRY STANDARD
ICS 43.040.50
CCS T 22
Replacing QC/T 241-2011
Air Leakage Detection Methods of Automobile Wheels for
Tubeless Tires
Issued on. JULY 19, 2024
Implemented on. JANUARY 1, 2025
Issued by. Ministry of Industry and Information Technology of the People’s
Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Terms and Definitions... 4
4 Samples... 4
5 Detection Methods... 5
5.1 Helium Detection Method... 5
5.2 Comparison Detection Method... 6
5.3 Hydrogen Detection Method... 8
5.4 Differential Pressure Detection Method... 9
5.5 Water Detection Method... 10
5.6 Compressed Air Method... 11
Appendix A (informative) Method of Determining Leak Rate... 13
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 for QC/T 241-2011 Air Leakage Test Methods of
Automobile Wheels for Tubeless Tires. In comparison with QC/T 241-2011, apart from
structural adjustments and editorial modifications, the main technical changes are as follows.
a) The scope of application is modified (see Chapter 1; Chapter 1 of Version 2011);
b) The terms and definitions are modified (see Chapter 3; Chapter 3 of Version 2011);
c) The definition of sample is modified (see Chapter 4; Chapter 4 of Version 2011);
d) The water detection method and compressed air method are modified (see Chapter 5;
Chapter 6 of Version 2011);
e) The comparison detection method, hydrogen detection method and differential
pressure detection method are added (see Chapter 5).
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 and shall be under the jurisdiction of National Technical
Committee 114 on Auto of Standardization Administration of China (SAC/TC 114).
The drafting organizations of this document. Dongfeng Motor Wheel Suizhou Co., Ltd.; CITIC
Dicastal Co., Ltd.; Zhejiang Jingu Co., Ltd.; Xingmin Lichi Co., Ltd.; Dongfeng Motor Chassis
Systems Co., Ltd.; Wanfeng Auto Wheels Co., Ltd.; FAWAY Automobile Components Co., Ltd.
Wheel Branch Company; Zhejiang Jinfei Kaida Wheel Co., Ltd.; Jiangsu Pomlead Co., Ltd.
The main drafters of this document. Wang Xianfu, You Guoxiang, Li Shide, Ye Yanfei, Chen
Yunjing, Cheng Xiaoqiang, Liu Chunhai, Mao Qiuxian, Zhang Shijiang, Zhu Hongbin, Dong
Qi.
The issuing of the previous versions.
---Firstly issued in 1997 as QC/T 241-1997 and firstly revised in 2011;
---This is the second revision.
Air Leakage Detection Methods of Automobile Wheels for
Tubeless Tires
1 Scope
This document describes six detection methods for the air leakage of automobile wheels,
namely, helium detection method, comparison detection method, hydrogen detection method,
differential pressure detection method, water detection method and compressed air method.
This document is applicable to automobile wheels equipped with tubeless tires. Among them,
helium detection method and water detection method are recommended for light alloy wheels;
comparison detection method, hydrogen detection method, differential pressure detection
method and compressed air method are recommended for steel wheels.
2 Normative References
The content of the following documents constitutes indispensable clauses of this document
through 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 2933 Wheels and Rims for Pneumatic Tyres - Vocabulary, Designation and Marking
3 Terms and Definitions
The terms and definitions defined in GB/T 2933, and the following are applicable to this
document.
3.1 leak rate
The amount of leakage caused by pressure difference per unit time.
3.2 critical leakage rate
The leak rate threshold used to qualify a component.
4 Samples
The samples for detection shall be new wheels or rims with unpainted and unused surfaces.
5 Detection Methods
5.1 Helium Detection Method
5.1.1 Detection equipment
The detection equipment shall have a sealing device that divides the wheel into two sealed
chambers, the inner and outer, and it shall be feasible to evacuate the two sealed chambers. It
shall be able to provide helium and detect the helium partial pressure in the sealed chambers in
the wheel (see Figure 1).
5.1.3 Detection procedures
5.1.3.1 Seal the valve hole of the wheel.
5.2 Comparison Detection Method
5.2.1 Detection equipment
The detection equipment shall have a sealing device, two detection heads and an air inlet pipe
(see Figure 2).
5.2.2 Detection conditions
There are no facilities that disturb the air near the detection equipment.
5.2.4 Evaluation of detection result
Compare the measurement difference between the two detection heads with the measurement
difference corresponding to the preset critical leakage rate. When it is less than the measurement
difference corresponding to the critical leakage rate, it shall be determined to be qualified. See
Appendix A for the method of determining the critical leakage rate.
5.4 Differential Pressure Detection Method
5.4.1 Detection equipment
The detection equipment shall have a sealing device that divides the periphery of the rim weld
into two sealed chambers, the inner and outer. It shall be able to vacuumize the sealed chambers,
and there shall be a vacuum leak detector (see Figure 4).
5.4.2 Detection conditions
The inner and outer sides of the rim weld under detection shall be kept clean.
5.4.3 Detection procedures
5.4.3.4 Stop pumping and inflating the inner and outer sealed chambers of the rim.
5.4.3.5 Remove the fixture.
5.4.3.6 Remove the rim.
5.4.4 Evaluation of detection result
Compare the leak rate on the inside of the rim with the preset critical leakage rate. When it is
smaller than the critical leakage rate, it shall be determined to be qualified. See Appendix A for
the method of determining the critical leakage rate.
5.5 Water Detection Method
5.5.1 Detection equipment
The detection equipment shall have sealing devices, transparent water tank, air pressure gauge,
as well as air intake and exhaust pipes (see Figure 5).
5.5.2 Detection conditions
The water quality shall be clean and the lighting shall be good.
5.5.3 Detection procedures
5.5.3.1 Seal the valve hole of the wheel.
5.5.3.2 Put the wheel between the sealing devices and tightly press the upper and lower rims to
seal the inside of the wheel.
5.6 Compressed Air Method
5.6.1 Detection equipment
The detection equipment shall have sealing devices, air pressure gauge, as well as air intake
and exhaust pipes (see Figure 6).
5.6.2 Detection conditions
The lighting shall be good.
5.6.3 Detection procedures
5.6.3.1 Put the rim into the device and tightly press it through the upper and lower rims, so as
to seal the inside of the rim [see Figure 6 a)]. Or, put the rim weld into the sealing device and
tightly press it through the rim section to seal near the outer weld or inner weld of the rim [see
Figure 6 b)].
5.6.3.4 Check the weld for any air bubbles escaping.
5.6.3.5 Open the sealing device.
5.6.3.6 Remove the rim.
5.6.4 Evaluation of detection result
Within a specified period of time after the inflation reaches the specified pressure, if air bubbles
escape from the rim weld, then, the rim shall be determined to be disqualified.
Rim Sealing Device
Rim Guard Inflation Pipeline
Fastening Tooling
Appendix A
(informative)
Method of Determining Leak Rate
A.1 Definition of Wheel Leakage
Under room-temperature conditions, for wheel and tire assemblies, in a certain tire volume, fill
the air pressure to the corresponding value, and within 6 months (180 days), the air pressure
drop rate is greater than 10%.
QC/T 241-2024
QC
AUTOMOTIVE INDUSTRY STANDARD
ICS 43.040.50
CCS T 22
Replacing QC/T 241-2011
Air Leakage Detection Methods of Automobile Wheels for
Tubeless Tires
Issued on. JULY 19, 2024
Implemented on. JANUARY 1, 2025
Issued by. Ministry of Industry and Information Technology of the People’s
Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Terms and Definitions... 4
4 Samples... 4
5 Detection Methods... 5
5.1 Helium Detection Method... 5
5.2 Comparison Detection Method... 6
5.3 Hydrogen Detection Method... 8
5.4 Differential Pressure Detection Method... 9
5.5 Water Detection Method... 10
5.6 Compressed Air Method... 11
Appendix A (informative) Method of Determining Leak Rate... 13
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 for QC/T 241-2011 Air Leakage Test Methods of
Automobile Wheels for Tubeless Tires. In comparison with QC/T 241-2011, apart from
structural adjustments and editorial modifications, the main technical changes are as follows.
a) The scope of application is modified (see Chapter 1; Chapter 1 of Version 2011);
b) The terms and definitions are modified (see Chapter 3; Chapter 3 of Version 2011);
c) The definition of sample is modified (see Chapter 4; Chapter 4 of Version 2011);
d) The water detection method and compressed air method are modified (see Chapter 5;
Chapter 6 of Version 2011);
e) The comparison detection method, hydrogen detection method and differential
pressure detection method are added (see Chapter 5).
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 and shall be under the jurisdiction of National Technical
Committee 114 on Auto of Standardization Administration of China (SAC/TC 114).
The drafting organizations of this document. Dongfeng Motor Wheel Suizhou Co., Ltd.; CITIC
Dicastal Co., Ltd.; Zhejiang Jingu Co., Ltd.; Xingmin Lichi Co., Ltd.; Dongfeng Motor Chassis
Systems Co., Ltd.; Wanfeng Auto Wheels Co., Ltd.; FAWAY Automobile Components Co., Ltd.
Wheel Branch Company; Zhejiang Jinfei Kaida Wheel Co., Ltd.; Jiangsu Pomlead Co., Ltd.
The main drafters of this document. Wang Xianfu, You Guoxiang, Li Shide, Ye Yanfei, Chen
Yunjing, Cheng Xiaoqiang, Liu Chunhai, Mao Qiuxian, Zhang Shijiang, Zhu Hongbin, Dong
Qi.
The issuing of the previous versions.
---Firstly issued in 1997 as QC/T 241-1997 and firstly revised in 2011;
---This is the second revision.
Air Leakage Detection Methods of Automobile Wheels for
Tubeless Tires
1 Scope
This document describes six detection methods for the air leakage of automobile wheels,
namely, helium detection method, comparison detection method, hydrogen detection method,
differential pressure detection method, water detection method and compressed air method.
This document is applicable to automobile wheels equipped with tubeless tires. Among them,
helium detection method and water detection method are recommended for light alloy wheels;
comparison detection method, hydrogen detection method, differential pressure detection
method and compressed air method are recommended for steel wheels.
2 Normative References
The content of the following documents constitutes indispensable clauses of this document
through 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 2933 Wheels and Rims for Pneumatic Tyres - Vocabulary, Designation and Marking
3 Terms and Definitions
The terms and definitions defined in GB/T 2933, and the following are applicable to this
document.
3.1 leak rate
The amount of leakage caused by pressure difference per unit time.
3.2 critical leakage rate
The leak rate threshold used to qualify a component.
4 Samples
The samples for detection shall be new wheels or rims with unpainted and unused surfaces.
5 Detection Methods
5.1 Helium Detection Method
5.1.1 Detection equipment
The detection equipment shall have a sealing device that divides the wheel into two sealed
chambers, the inner and outer, and it shall be feasible to evacuate the two sealed chambers. It
shall be able to provide helium and detect the helium partial pressure in the sealed chambers in
the wheel (see Figure 1).
5.1.3 Detection procedures
5.1.3.1 Seal the valve hole of the wheel.
5.2 Comparison Detection Method
5.2.1 Detection equipment
The detection equipment shall have a sealing device, two detection heads and an air inlet pipe
(see Figure 2).
5.2.2 Detection conditions
There are no facilities that disturb the air near the detection equipment.
5.2.4 Evaluation of detection result
Compare the measurement difference between the two detection heads with the measurement
difference corresponding to the preset critical leakage rate. When it is less than the measurement
difference corresponding to the critical leakage rate, it shall be determined to be qualified. See
Appendix A for the method of determining the critical leakage rate.
5.4 Differential Pressure Detection Method
5.4.1 Detection equipment
The detection equipment shall have a sealing device that divides the periphery of the rim weld
into two sealed chambers, the inner and outer. It shall be able to vacuumize the sealed chambers,
and there shall be a vacuum leak detector (see Figure 4).
5.4.2 Detection conditions
The inner and outer sides of the rim weld under detection shall be kept clean.
5.4.3 Detection procedures
5.4.3.4 Stop pumping and inflating the inner and outer sealed chambers of the rim.
5.4.3.5 Remove the fixture.
5.4.3.6 Remove the rim.
5.4.4 Evaluation of detection result
Compare the leak rate on the inside of the rim with the preset critical leakage rate. When it is
smaller than the critical leakage rate, it shall be determined to be qualified. See Appendix A for
the method of determining the critical leakage rate.
5.5 Water Detection Method
5.5.1 Detection equipment
The detection equipment shall have sealing devices, transparent water tank, air pressure gauge,
as well as air intake and exhaust pipes (see Figure 5).
5.5.2 Detection conditions
The water quality shall be clean and the lighting shall be good.
5.5.3 Detection procedures
5.5.3.1 Seal the valve hole of the wheel.
5.5.3.2 Put the wheel between the sealing devices and tightly press the upper and lower rims to
seal the inside of the wheel.
5.6 Compressed Air Method
5.6.1 Detection equipment
The detection equipment shall have sealing devices, air pressure gauge, as well as air intake
and exhaust pipes (see Figure 6).
5.6.2 Detection conditions
The lighting shall be good.
5.6.3 Detection procedures
5.6.3.1 Put the rim into the device and tightly press it through the upper and lower rims, so as
to seal the inside of the rim [see Figure 6 a)]. Or, put the rim weld into the sealing device and
tightly press it through the rim section to seal near the outer weld or inner weld of the rim [see
Figure 6 b)].
5.6.3.4 Check the weld for any air bubbles escaping.
5.6.3.5 Open the sealing device.
5.6.3.6 Remove the rim.
5.6.4 Evaluation of detection result
Within a specified period of time after the inflation reaches the specified pressure, if air bubbles
escape from the rim weld, then, the rim shall be determined to be disqualified.
Rim Sealing Device
Rim Guard Inflation Pipeline
Fastening Tooling
Appendix A
(informative)
Method of Determining Leak Rate
A.1 Definition of Wheel Leakage
Under room-temperature conditions, for wheel and tire assemblies, in a certain tire volume, fill
the air pressure to the corresponding value, and within 6 months (180 days), the air pressure
drop rate is greater than 10%.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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