VietnameseNational technical regulation QCVN 44:2012/BGTVT technical requirements for steel rims of mopeds
ATTRIBUTE
| Issuing body: | Ministry of Transport | Effective date: | Known Please log in to a subscriber account to use this function. Don’t have an account? Register here |
| Official number: | QCVN 44:2012/BGTVT | Signer: | |
| Type: | Vietnamese Technical Regulation | Expiry date: | Known Please log in to a subscriber account to use this function. Don’t have an account? Register here |
| Issuing date: | 21/12/2012 | Effect status: | Known Please log in to a subscriber account to use this function. Don’t have an account? Register here |
| Fields: | Transport |
QCVN 44:2012/BGTVT
NATIONAL TECHNICAL REGULATION ON TECHNICAL REQUIREMENTS AND TEST METHODS FOR STEEL RIMS OF MOTORCYCLES AND MOPEDS
Foreword
QCVN 44: 2012/BGTVT is compiled by the Vietnam Register, and submitted by the Department of Science and Technology to the Minister of Transport for promulgation in accordance with Circular No. 52/2012/TT-BGTVT dated December 21, 2012.
This regulation is compiled on the basis ofIndustry Standards No. 22 TCN 293-02 promulgated together with Decision No. 1636/2002/QD-BGTVT dated May 30, 2002 of the Minister of Transport.
NATIONAL TECHNICAL REGULATION ON TECHNICAL REQUIREMENTS AND TEST METHODS FOR STEEL RIMS OF MOTORCYCLES AND MOPEDS
1. GENERAL PROVISIONS
1.1 Scope of regulation
This regulation specifies technical requirements and methods for testing technical safety quality of steel rims of motorcycles and mopeds (hereinafter referred to as steel rims for short).
1.2 Subjects of application
This regulation applies to manufacturers and importers of steel rims, manufacturers and assembly factories of motorcycles and mopeds as well as authorities and organizations involved in testing and certifying technical safety quality.
2. TECHNICAL PROVISIONS
2.1Surface of steel rims
2.1.1Steel rims must be manufactured strictly according to the design or technical documents of the manufacturers.
2.1.2The surface of steel rims must be free from cracks, breaks and other visible defects.
2.1.3The nominal diameter code and nominal width code (see Appendix A) must be marked on the steel rim at visible positions after the tyre is fitted to the rim.
2.2 Surface treatment of steel rims
Depending on the coating material, the steel rim must undergo surface treatments meeting the following requirements:
The minimum plating thickness for nickel is 10 µm, and for chromium, it is 0.15 µm.
It does not apply to invisible parts of the steel rim’s surface after the steel rim is fitted to the wheel.
2.3 Dimensions
2.3.1 Cross section and dimensions
Dimensions and tolerances of the steel rims as specified in Appendix A.
2.3.2 Diameter variation
The diameter variation of steel rim (the difference between the largest and smallest value of the steel rim’s diameter) must not be greater than 1.2 mm.
2.3.2 Coplanarity
The coplanarity of the steel rim is measured by placing the rim on the reference plane as shown in Figure 1. The worst-case height from the seating plane to the steel rim’s surface shall not exceed 0.8 mm.
2.4 Durability
The steel rim does not break or crack when a force F is applied to the rim as described in Figure B1. If the deformation of the steel rim reaches the value specified in Table 1, the applied force must not be less than the value specified in Table 2.
The test methods are described in Appendix B
Nominal width code of steel rim | Nominal diameter of steel rim (inch) | ||
£15 | 16, 17, 18 | ≥19 | |
Deformation (mm) | |||
from 1.10 to 2.75 and from MT1.85 to MT6.00 | 10 | 15 | 20 |
Table 1 -Deformation
Table 2 - Radial force
Nominal width code of steel rim | Force (kN) | |
1.10 | - | 0.98 |
1.20 | - | 1.47 |
1.40 | - | 1.96 |
1.50 | - | 2.45 |
1.60 | - | 3.43 |
1.85 | MT 1.85 | 4.41 |
2.15 | MT 2.15 | 4.90 |
2.50 | MT 2.50 | 6.37 |
2.75 | MT 2.75 | 6.37 |
- | MT 3.00 | 6.37 |
- | MT 3.50 | 6.37 |
- | MT 4.00 | 6.37 |
- | MT 4.50 | 6.37 |
- | MT 5.00 | 6.37 |
- | MT 5.50 | 6.37 |
- | MT 6.00 | 6.37 |
3. MANAGEMENT PROVISIONS
3.1 Test methods
Newly manufactured, assembled and imported steel rims must be inspected, tested and certified in accordance with Circular No. 45/2012/TT-BGTVT dated October 23, 2012, of the Minister of Transport, on testing technical safety quality and environment protection in the production and assembly of motorcycles and mopeds.
3.2 Technical documents and test samples
When there is a need for testing, the manufacturer or the importer of steel rims must provide the testing facility with technical documents and test samples meeting the requirements specified in Sections 3.2.1 and 3.2.2.
3.2.1 Technical document requirements
The technical drawings of the steel rim must show the main dimensions as specified in Appendix A.
3.2.2 Test sample
03 test samples.
3.3 Test report
The testing facility must make a report of the test results, containing at least the items specified in this Regulation corresponding to each type of steel rim.
3.4 Application of provisions
In the case where the documents and references in this Regulation are changed, supplemented or replaced, the new ones shall prevail.
3.5 For types of steel rims that have been inspected and tested in accordance with the provisions of 3.1 and registered in accordance with this Regulation, they will be granted a Type Approval Certificate made using the form specified in Appendix C.
4. ORGANIZATION OF IMPLEMENTATION
4.1 Implementation roadmap
From the effective date of this Regulation; particularly, the requirements specified in Section 2.1.3 may apply after 02 years to new types of steel rims and after 04 years to steel rim types that have been granted Type Approval Certificates prior to the date on which the requirements must apply to the new types.
4.2 Responsibilities of the Vietnam Register
The Vietnam Register shall be responsible for implementing and guiding the implementation of this Regulation in technical safety quality testing ofmanufactured, assembled and imported steel rims.
Appendix A
A.1Steel rims are classified according to the table below:
Table A1 - Classification of rims
Type | Abbreviation | Model | Figure | Notes |
Drop centre | DC | WM | Figure A1 | Tube-type |
MT | Figure A2 | 5° tubeless | ||
Figure A6 | ||||
LF | Figure A8 |
A.2Steel designation: 18 x 1.85
Rims may be marked with additional designations (depending on the manufacturers).
A.3Side profiles and dimensions of steel rim
A.3.1Side profiles, dimensions and tolerances of:
- Drop-centre steel rim WM as specified in Figure A1 and Tables A2, A3
- Drop-centre steel rim MT as specified in Figures A2 to A5 and Table A4 to A7; Figures A6, A7 and Tables A8 to A10
- Drop-centre steel rim LF as specified in Figures A8 to A10 and Tables A11, A12
A.3.2The left and right sections of steel rim shall be symmetrical. The dimensional difference between the right and the left created when folding the side profile of steel rim through the symmetry axis should not be more than 0.5 mm.
Table A2 - Dimensions of Drop-centre Rim WM (mm)
Nominal width codes of steel rim | A | B Minimum | G | H | P | J | R1 Minimum | R2 | R3 Maximum | R4 Minimum | R5 | ||||
Dimension | Tolerance | Dimension | Tolerance | Dimension | Tolerance | Dimension | Tolerance | ||||||||
1.10 | 28.0 | +1.0 -0.5 | 5.0 | 7.0 | ±0.5 | 7.0 | +1.0 -0.5 | 3.0 | +2.0 0 | 2.0 | 1.5 | 5.5 | 1.5 | 5.0 | 7.0 |
1.20 | 30.5 | 5.5 | 9.0 | 3.5 | 6.0 | ||||||||||
1.40 | 36.0 | 6.5 | 10.0 | 8.0 | 3.5 | 4.0 | 2.0 | 6.5 | 10.0 | ||||||
1.50 | 38.0 | 7.5 | 10.5 | 4.0 | 7.0 | 2.0 | 5.5 | 11.5 | |||||||
1.60 | 40.5 | 12.0 | 4.5 | 4.5 | 8.0 | 13.0 | |||||||||
1.85 | 47.0 | 8.5 | 14.0 | 9.0 | 5.0 | 3.5 | 12.5 | 6.0 | 15.0 | ||||||
2.15 | 55.0 | 7.5 | 7.0 | 18.5 | |||||||||||
2.50 | 63.5 | 9.5 | 3.0 | 19.0 | |||||||||||
2.75 | 70.0 | 10.5 | 12.0 | 11.0 | 3.0 | ||||||||||
Table A3 - Diameter D and Perimeter of Drop-centre Rim WM (mm)
Nominal diameter codes of steel rim | D. | Perimeter with Diameter D | |
Dimension | Tolerance | ||
14 | 357.1 | 1121.9 | +2.0 -0.5 |
15 | 382.5 | 1201.7 | |
16 | 405.6 | 1274.2 | |
17 | 433.3 | 1361.2 | |
18 | 458.7 | 1441.0 | |
19 | 484.1 | 1520.8 | |
20 | 509.5 | 1600.6 | |
21 | 534.9 | 1680.4 | |
22 | 558.8 | 1755.5 | |
23 | 584.2 | 1835.3 | |
Table A4 - Dimensions of Drop-centre Rim MT (mm)
Nominal width codes of steel rim | A | B | G | H | C | E | R1 | R2 | R3 | R4 | R5 | R6 | R7 | |||||||
Dimension | Tolerance | Minimum | Maximum | Dimension | Tolerance | Dimension | Tolerance |
| Dimension | Tolerance | Minimum |
| Maximum | Dimension | Tolerance | Minimum | Maximum | Dimension | Tolerance | |
MT 1.85 | 47.0 | +1.0 -0.5 | 9.0 | 12.5 | 14.0 | ±0.5 | 9.0 | +1.0 0 | 10.5 | 10.5 | +0.5 0 | 3.0 | 12.5 | 2.5 | 2.5 | ±0.5 | 3.0 | 2.5 | 2.5 | ±0.5 |
MT 2.15 | 55.0 | 13.0 | 3.0 | 3.0 | ||||||||||||||||
MT 2.50 | 63.5 | +1.5 -1.0 | +1.0 -0.5 | 12.0 | +2.0 0 | 5.5 | ||||||||||||||
MT 2.75 | 70.0 | 14.0 | ||||||||||||||||||
MT 3.00 | 76.0 | 13.0 | 15.0 | |||||||||||||||||
MT 3.50 | 89.0 | |||||||||||||||||||
MT 4.00 | 101.5 | 16.0 | ||||||||||||||||||
MT 4.50 | 114.5 | |||||||||||||||||||
MT 5.00 | 127.0 | |||||||||||||||||||
MT 5.50 | 140.0 | |||||||||||||||||||
MT 6.00 | 152.5 | |||||||||||||||||||
Notes: 1. The borderline as shown in Figure A3 can be used as the borderline of steel rims with nominal width MT 1.85 and MT 2.15. 2. The borderline as shown in Figure A4 can be used to draw perforated components of steel rim 3. The perforated components of steel rims with the nominal width not less than MT 2.50 may require only a radius R as shown in Figure A5, provided that the value of R must be agreed between the interested parties and the supplier. | ||||||||||||||||||||
Table A5 - Diameter D and Perimeter of Drop-centre Rim MT (mm)
Nominal diameter codes of steel rim | D. | Perimeter with Diameter D | Perimeter with Diameter DH | ||
Dimension | Tolerance | Dimension | Tolerance | ||
14 M/C | 357.6 | 1123.4 | +1.5 -0.5 | 1121.3 | +2.0 -1.0 |
15 M/C | 383.0 | 1203.2 | 1201.1 | ||
16 | 406.0 | 1275.5 | ±0.1 | 1273.4 | |
17 | 433.8 | 1362.8 | +1.5 -0.5 | 1360.7 | |
18 | 459.2 | 1442.6 | 1440.5 | ||
19 | 484.6 | 1522.4 | 1520.3 | ||
20 | 510.0 | 1602.2 | 1600.1 | ||
21 | 535.4 | 1682.0 | 1679.9 | ||
23 | 584.7 | 1836.9 | 1834.8 | ||
Table A6 - Dimensions P and R4(mm)
Nominal width codes of steel rim | P | R4 Minimum | |
Dimension | Tolerance | ||
MT 1.85 | 8.0 | +2.0 0 | 6.5 |
MT 2.15 | 11.0 | ||
 |
Table A7 - Dimensions R5and R9(mm)
Nominal width codes of steel rim | R5 Minimum | R9 Minimum |
MT 1.85 | 3.0 | 20.0 |
MT 2.15 | ||
MT 2.50 | 30.0 | |
MT 2.75 | ||
MT 3.00 | 40.0 | |
MT 3.50 | ||
MT 4.00 | ||
MT 4.50 | ||
MT 5.00 | ||
MT 5.50 | ||
MT 6.00 |
Table A8 - Dimensions of Drop-centre Rim MT (mm)
Nominal width codes of steel rim | A | B | G | H | C | E | R1 | R2 | R3 | R4 | R5 | R6 | R7 | |||||||
Dimension | Tolerance | Minimum | Maximum | Dimension | Tolerance | Dimension | Tolerance |
| Dimension | Tolerance | Minimum |
| Maximum | Dimension | Tolerance | Minimum | Maximum | Dimension | Tolerance | |
MT 1.85 | 47.0 | +1.0 -0.5 | 9.0 | 12.5 | 14.0 | ±0.5 | 9.0 | +1.0 0 | 10.5 | 10.5 | +0.5 0 | 3.0 | 12.5 | 2.5 | 2.5 | ±0.5 | 3.0 | 2.5 | 2.5 | ±0.5 |
MT 2.15 | 55.0 | 13.0 | 3.0 | 3.0 | ||||||||||||||||
MT 2.50 | 63.5 | +1.5 -1.0 | +1.0 -0.5 | 12.0 | +2.0 0 | 5.5 | ||||||||||||||
MT 2.75 | 70.0 | 14.0 | ||||||||||||||||||
MT 3.00 | 76.0 | 13.0 | 15.0 | |||||||||||||||||
MT 3.50 | 89.0 | |||||||||||||||||||
Notes: The borderline as shown in Figure A7 can be used as the borderline of steel rims with nominal width MT 1.85 and MT 2.15. | ||||||||||||||||||||
Table A9 - Diameter D and Perimeter of Drop-centre Rim MT (mm)
Nominal diameter codes of steel rim | D. | Outer perimeter of Diameter D | Outer perimeter of Diameter DH | ||
Dimension | Tolerance | Dimension | Tolerance | ||
10 | 253.2 | 795.4 | +1.5 -0.5 | 793.3 | +2.0 -1.0 |
12 | 304.0 | 995.0 | 952.9 | ||
Table A10 - Dimensions P and R4(mm)
Nominal width codes of steel rim | P | R4 Minimum | |
Dimension | Tolerance | ||
MT 1.85 | 8.0 | +2.0 0 | 6.5 |
MT 2.15 | 11.0 | ||
Table A11 - Dimensions of Drop-centre Rim LF (mm)
Nominal width codes of steel rim | A | B | G | H | C | P | R1 | R2 | R3 | R4 | R5 | a(o) | ||||||
Dimension | Tolerance | Minimum | Maximum | Dimension | Tolerance | Dimension | Tolerance |
| Dimension | Tolerance | Minimum |
| Maximum | Minimum | Minimum | Decree | Tolerance | |
1.20 | 30.5 | +1.0 -0.5 | 5.5 | 7.5 | 9.0 | ±0.5 | 10.0 | ±1.0 | 5.5 | 4.0 | +2.0 0 | 1.5 | 6.0 | 1.5 | 4.5 | 3.0 | 10 | ±5 |
1.50 | 38.0 | 7.5 | 11.5 | 10.5 | 6.5 | 3.0 | 7.0 | 2.0 | 5.5 | |||||||||
1.85 | 47.0 | 8.0 | 6.5 | 22 | 0 -5 | |||||||||||||
2.15 | 55.0 | 11.0 | ||||||||||||||||
Notes 1. In the case where the nominal width of the steel rim is 1.85, additional humps as shown in Figure A9 can be created. 2. In the case where the nominal width of the steel rim is 2.15, additional humps as shown in Figure A10 can be created. 3. In the case where the nominal width of the steel rim is 1.20 and 1.50 and the nominal diameter of the rim is 10, the smallest allowable dimension of H is 8.0. | ||||||||||||||||||
Table A12 - Diameter D and Perimeter of Drop-centre Rim LF (mm)
Nominal diameter codes of steel rim | D. | Perimeter with Diameter D
| Perimeter with Diameter DH
| ||
Dimension | Tolerance | Dimension | Tolerance | ||
8 | 202.4 | 635.8 | +1.5 -0.5 | 633.7 | +2.0 -1.0 |
10 | 253.2 | 795.4 | 793.3 | ||
12 | 304.0 | 955.0 | 952.9 | ||
Appendix B
Durability test method
The force shall be applied as follows:
 |
Place the steel rim vertically on a base with its surface where the steel rim is placed not less than the horizontal nominal width of the steel rim. Apply force slowly in the radial direction of the steel rim.
Appendix C
TEMPLATE CERTIFICATE
VIETNAMESE DOCUMENTS
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ENGLISH DOCUMENTS
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