QC/T 1141-2020Automobile clutch release bearing assemblies (English PDF)
汽车离合器分离轴承总成
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Issued by
MIIT
Level / Type
Industry · Recommended
Issue date
December 9, 2020
Implementation date
April 1, 2021
Scope
QC/T 1141-2020 is the English-translated version of 汽车离合器分离轴承总成.
QC/T 1141-2020 covers the technical requirements and the bench test methods for the automobile clutch release bearing assembly, and applies to mechanically controlled and hydraulically controlled assemblies.
It takes its vocabulary from QC/T 1125-2019, its only normative reference, and adds definitions of the self-aligning and non-aligning assembly. Each requirement is a pass value tied to a numbered bench test.
The aligning force of a self-aligning assembly shall be 25 to 150 N for a passenger car and 100 to 400 N for a commercial vehicle, the aligning displacement not less than 1.0 mm, and the noise shall not exceed 64 dB(A) on a passenger car assembly and 74 dB(A) on a commercial vehicle assembly; in each of these an assembly with special requirements may instead be judged against the customer's technical requirements.
After the durability test no part of the assembly shall be damaged, wear on the rotating end face of the bearing shall be not more than 0.5 mm, the noise measured after the test not more than 120% of the value before it, and the assembly shall still meet the requirements of 4.1, 4.2 and 4.3, a hydraulically controlled assembly also pressure resistance and low pressure sealing.
Pressure resistance allows a pressure drop below 0.5 MPa on a commercial vehicle assembly and below 0.2 MPa on a passenger car assembly, and low pressure sealing a pressure drop below 1 kPa.
For hydraulically controlled assemblies these tests are repeated in order after durability.
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Document preview — QC/T 1141-2020
National Standard of the People's Republic of China
Issued by: Ministry of Industry and Information Technology of the People's Republic of China
Contents
- Foreword6
- 1 Scope7
- 2 Normative Reference7
- 3 Terms and Definitions7
- 4 Technical Requirements8
- 5 Test Methods10
1 Scope
This document specifies the technical requirements and bench test methods for automotive clutch release bearing assembly.
This document is applicable to automotive mechanically and hydraulically controlled clutch release bearing assembly.
2 Normative Reference
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) is applicable to this document.
QC/T 1125-2019 Automobile Clutch System Terms and Definitions
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in QC/T 1125-2019 and the following apply.
3.1 Mechanically controlled clutch release bearing
A clutch release bearing that realizes clutch separation and engagement under the action of a mechanical mechanism.
3.2 Hydraulically controlled clutch release bearing
The clutch release bearing that realizes the clutch separation and engagement under the action of hydraulic pressure.
3.3 Self-aligning clutch release bearing assembly
Bearing assembly with automatic adjustment to realize the coaxial rotation performance of the clutch release bearing assembly and the clutch cover assembly.
4 Technical Requirements
4.2 Aligning force
According to the test method specified in 5.1.2, the aligning force of self-aligning clutch release bearing assembly of a passenger car shall be 25~150N; and the aligning force of self-aligning clutch release bearing assembly of a commercial vehicle shall be 100~400N; for those with special requirements, they can be implemented according to customer's technical requirements.
4.3 Aligning displacement
According to the test method specified in 5.1.3, the aligning displacement of the self- aligning clutch release bearing assembly shall be no less than 1.0mm; for those with special requirements, they can be implemented according to the customer's technical requirements.
4.4 Noise
According to the test method specified in 5.1.4, the noise of the clutch release bearing assembly of passenger cars shall not exceed 64dB (A); and the noise of the clutch release bearing assembly of commercial vehicles shall not exceed 74dB (A); for those with special requirements, they can be implemented according to customer's technical requirements.
4.5 Durability
After the durability test is completed in accordance with the test conditions specified in 5.1.5.1, any part of the clutch release bearing assembly shall not be damaged; the amount of wearing on the rotating end face of the bearing shall be no greater than 0.5mm; and the noise value after the test shall be no greater than 120% before the test; and it shall meet the performance requirements of 4.1, 4.2 and 4.3; and the hydraulically controlled clutch release bearing shall also meet the performance requirements of 4.6 and 4.7.
4.6 Pressure resistance
According to the test method specified in 5.2.6, the pressure drop of the hydraulically controlled clutch release bearing assembly of the commercial vehicle shall be less than 0.5MPa; and the pressure drop of the hydraulically controlled clutch release bearing assembly of the passenger car shall be less than 0.2MPa.
4.7 Low pressure sealing performance
According to the test method specified in 5.2.7, the pressure drop of the hydraulically controlled clutch release bearing assembly shall be less than 1kPa.
5 Test Methods
5.2 Hydraulically controlled clutch release bearing assembly
5.2.1 Start-up torque test
The same as 5.1.1.
5.2.2 Aligning force test
The same as 5.1.2.
5.2.3 Aligning displacement test
The same as 5.1.3.
5.2.4 Noise test
The same as 5.1.4.
5.2.5 Durability test
5.2.5.1 Test conditions
The same as 5.1.5.1.
5.2.5.2 Test procedures
The hydraulically controlled clutch release bearing assembly and the matching clutch cover assembly and housing shall be installed on the test device shown in Figure 6 for durability test. After the test is completed, it shall be retested in sequence according to the test methods specified in 5.2.1, 5.2.2, 5.2.3, 5.2.4, 5.2.6 and 5.2.7.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 16 pages — is available in the English PDF.
Referenced standards
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