QC/T 648-2015Performance requirements and bench test methods for automotive steering tie rod assemblies (English PDF)
汽车转向拉杆总成性能要求及台架试验方法
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Issued by
MIIT
Level / Type
Industry · Recommended
Issue date
October 10, 2015
Implementation date
March 1, 2016
Scope
QC/T 648-2015 is the English-translated version of 汽车转向拉杆总成性能要求及台架试验方法.
QC/T 648-2015 sets the performance requirements and bench test methods for the steering tie rod assembly of a motor vehicle, ball joint assembly and ball pin included.
Clause 3 defines terms such as the maximum oscillating angle, swept by the ball pin between its two extreme positions.
Clause 4 leaves ball joint rigidity and strength and ball pin static strength to the product drawing, and asks the ball joint assembly to survive one million durability cycles with no oil leakage and no cracked or broken parts, the tie rod assembly over one million fatigue cycles.
Clause 5 works between 5 °C and 35 °C with instruments of accuracy level not less than 0.5 for performance tests and not less than 1.5 for durability ones, oscillates at 0.1 Hz to 1 Hz, sprays muddy water at the dust cover seal, and rechecks rotating torque, oscillating torque and rigidity before stripping the joint to gauge wear.
Issued by MIIT on 10 October 2015, it replaces QC/T 304-1999 and has applied since 1 March 2016.
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Document preview — QC/T 648-2015
National Standard of the People's Republic of China
- Replacing
- QC/T 304-1999
Issued by: Ministry of Industry and Information Technology of the People's Republic of China
Contents
- Foreword5
- 1 Scope6
- 2 Normative references6
- 3 Terms and definitions6
- 4 Performance requirements7
- 5 Test method8
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009 "Directives for standardization - Part 1. Structure and drafting of standards".
This standard replaces QC/T 304-1999 "Bench test methods of automotive steering tie rod assy", QC/T 648-2000 "Performance requirements and test of automotive steering tie rod assy", and QC/T 650-2000 "Performance requirements and test methods of automotive steering tie rod ball pin". As compared with QC/T 304-1999, QC/T 648-2000, and QC/T 650-2000, the main technical changes of this standard are as follows.
- INTEGRATE the performance, strength, and durability test methods and performance requirements for the steering tie rod assembly and its components;
- ADD and DETAIL some terms and definitions;
- ADD the environmental durability test of ball joint assembly;
- MODIFY the ball joint assembly clearance test;
- MODIFY the relevant test of the tie rod assembly;
- DELETE the bending fatigue test of the ball pin;
- ADD the static strength test of the ball pin.
1 Scope
This standard specifies the performance requirements and bench test methods of the steering tie rod assembly.
This standard applies to steering tie rod assembly for automotive use.
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 3730.2 Road vehicle - Masses - Vocabular and codes
GB/T 5179 Automotive steering systems - Terms and definitions
JIS Z 8901 Test powder and test particles
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1 Maximum oscillating angle
As shown in Figure 1, the ball pin is swung back and forth in the direction specified by the product drawing so that the ball pin in the ball joint assembly is moved from one extreme position to the other extreme position through the center of the ball pin holder, AND the ball pin is at the included angle between the two extreme positions.
4 Performance requirements
When tested in accordance with 5.3, the rigidity of the ball joint assembly shall comply with the requirements of the product drawing.
4.3 Ball joint assembly strength
When tested in accordance with 5.4, the strength of the ball joint assembly shall comply with the requirements of the product drawing.
4.4 Ball pin static strength
When tested in accordance with 5.5, the static strength of the ball pin shall comply with the requirements of the product drawing.
4.5 Ball joint assembly durability test
When tested in accordance with 5.6.1, after the product has been tested for 1 million times, the ball joint assembly shall be free from oil leakage, the parts shall not have any crack or breakage, AND the basic performance of the ball joint assembly after the durability test shall comply with the requirements of the product drawing.
When tested in accordance with 5.6.2, after the specified durability test, the product sample shall have penetrated sediment or water, the grease in the sealed cavity shall be free from abnormality, AND the sealed dust cover shall be free from damage or aging.
4.6 Tie rod assembly fatigue life
When tested in accordance with 5.7, after the product has been subjected to the fatigue life test for over 1 million times, the tie rod assembly shall be free from oil leakage, AND the parts shall not have any crack or breakage
5 Test method
5.6.1.4 After the durability test, TEST the performance of the rotating torque, oscillating torque, and assembly rigidity again in accordance with 5.2.2, 5.2.3, and 5.3, and meanwhile DISASSEMBLE the ball joint holder to check the degree of wear of the ball holder and the ball pin.
5.1 Test equipment and conditions
5.1.1 The equipment used in the test shall comply with the requirements of the relevant item test conditions AND shall not adversely affect the function of the test sample. As for all the instruments used to record all parameters in the performance test, the accuracy level shall be not less than level 0.5. As for the instruments used to measure and indicate all parameters in the durability test, the accuracy level shall be not less than level 1.5.
5.1.2 Unless otherwise specified, the ambient temperature of all tests shall be 5 °C ~ 35 °C.
h) Test frequency. 0.1 Hz ~ 1 Hz OR in accordance with the technical requirements of the product drawing;
i) Number of tests. the number of oscillating cycles is more than 1 million times; j) Temperature conditions. Room temperature. (20 ± 5) °C; High and low temperature. according to product drawing requirements.
5.6.2 Muddy water environment durability test of ball joint assembly
5.6.2.1 As shown in Figure 16, INSTALL the ball joint assembly onto the test device, at a direction same as the installation direction of the actual automobile as far as possible; ADJUST the size and shape of the text fixture as well as the roughness of the fitting end surface of the ball pint assembly dust cover to be same as the actual automobile as far as possible. Meanwhile, when installing the test fixture, it shall ensure that the muddy water is sprayed over the sealing part of the dust cover OR the enclosure end of the ball pin holder.
5.6.2.2 PERFORM test in accordance with the test conditions as specified in 5.6.2.3. In the test process, it shall cool down the ball joint assembly, to ensure that the surface temperature of the ball joint assembly does not exceed 70 °C.
5.6.2.4
After the specified durability test, DISASSEMBLE the ball joint assembly and CHECK the sediment and water penetration of sample, the grease in the sealing cavity, and the sealing dust cover damage or ageing.
5.7 Tie rod assembly fatigue life test
5.7.1 INSTALL the tie rod assembly on the corresponding test device. The installation, fixing and force of the tie rod assembly shall be in consistent with the actual automobile status.
5.7.2 PERFORM the fatigue life tests in accordance with the test conditions specified in 5.7.3. In the test process, it shall cool down the ball joint assembly, to ensure that the surface temperature of the ball joint assembly does not exceed 70 °C.
5.7.3 PERFORM the fatigue life test of the tie rod assembly in accordance with the following conditions.
a) Test load direction. as shown in Figure 17 and Figure 18; […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 19 pages — is available in the English PDF.
Referenced standards
Similar standards
Editions of QC/T 648
| Edition | Title | Revision | Status |
|---|---|---|---|
| QC/T 648-2015 | Performance requirements and bench test methods for automotive steering tie rod assemblies | current edition | Current |
| QC/T 304-1999 | Performance requirements and bench test methods for automotive steering tie rod assemblies | previous edition | Superseded |
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