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GB 9744-2007 English PDF (GB9744-2007)

GB 9744-2007 English PDF (GB9744-2007)

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GB 9744-2007: Truck tyres

This Standard specifies the terms and definitions, requirements, test methods and marking of truck tyres. This Standard is applicable to new pneumatic tyres of truck.
GB 9744-2007
GB
ICS 83.160.10
G 41
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
Replacing GB 9744-1997
Truck Tyres
ISSUED ON. NOVEMBER 1, 2007
IMPLEMENTED ON. APRIL 1, 2008
Jointly issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic
of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 5
4 Requirements ... 5
5 Test Methods ... 7
6 Marking ... 7
Appendix A (Normative) Corresponding Relationship of Speed Symbol
and Maximum Speed of Tyre ... 9
Appendix B (Normative) Corresponding Relationship between Load
Index (LI) and Tyre Load Capacity (TLCC) ... 10
Foreword
4.1~4.6, 4.7.1 and Chapter 6 in this Standard are compulsory; the rest are recommendatory.
This Standard replaces GB 9744-1997 "Truck Tyres".
Compared with GB 9744-1997, the main changes of this Standard are as follows. ?€? The specification and dimension table is deleted. It is cited as footnotes (3.1 of 1997 edition, 4.1 of this edition);
?€? The assessment of the arithmetic mean value of failure energy at five points is changed into that of the values of failure energy at each test point (3.6.1 of 1997 edition; 4.5.1.1 and 4.5.1.2 of this edition);
?€? Assess the failure energy of truck tyres respectively in metric series and inch series (4.5.1.1 and 4.5.1.2 of this edition);
?€? The inspection rules are deleted (Chapter 5 of 1997 edition);
?€? The table of operating speeds corresponding to loads is deleted (Table 19 of 1997 edition);
?€? The requirements for the marking of tyres are modified (see Chapter 6). Appendix A and Appendix B of this Standard are normative.
This Standard was proposed by the China Petroleum and Chemical Industry Association.
This Standard shall be under the jurisdiction of the National Technical Committee on Tyre and Rim of Standardization Administration of China (SAC/TC 19).
The National Technical Committee on Tyre and Rim of Standardization Administration of China is entrusted for the explanation of this Standard.
Drafting organizations of this Standard. Beijing Research and Design Institute of Rubber Industry, and Qingdao Yellow Sea Rubber Company Limited.
Chief drafting staffs of this Standard. Wang Kexian, Mao Qingwen, and Xu Lihong. The historical editions replaced by this Standard are.
?€? GB 516-1965, GB 516-1974, GB 516-1982, GB 516-1989, GB 9744-1988, and GB 9744-1997.
NATIONAL STANDARD
OF THE PEOPLE'S REPUBLIC OF CHINA
Truck Tyres
1 Scope
This Standard specifies the terms and definitions, requirements, test methods and marking of truck tyres.
This Standard is applicable to new pneumatic tyres of truck.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this Standard. For dated references, subsequent amendments (excluding corrections) to, or revisions of, any of these publications do not apply. However, all parties who have reached an agreement based on this Standard are encouraged to study whether the latest editions of these documents are applicable. For undated references, the latest editions of the normative documents referred to apply.
GB/T 521 "Test Method of Measuring Peripheral Dimensions for Tyres"
GB/T 2977 "Series of Truck Tyres"
GB/T 4501 "Endurance Test for Truck and Bus Tyres - Drum Method" (GB/T
4501-1998, eqv ISO 10454.1993)
GB/T 6326 "Tyre Terms and Definitions" (GB/T 6326-2005, ISO 4223-1.2002, NEQ)
GB/T 6327 "Strength Test Method for Truck and Bus Tyres" (GB/T 6327-1996, eqv JIS D 4230.1986)
GB/T 7035 "High Speed Performance Test for Light Truck Tyres - Drum Method" GB 7036.1 "Inner Tube of Pneumatic Tyres - Part 1. Inner Tube of Motor Vehicle Tyres" (GB 7036.1-1997, eqv JIS D 4231. 1987)
HG/T 2177 "Appearance Quality of Tyres"
less than 1.6mm for midget and light truck tyres, and 2.0mm for truck tyres. 4.6.2 Marks shall be moulded on the shoulders of tyre on both sides to indicate the positions of tread wearing marks.
4.7 Appearance quality
4.7.1 The covers shall not have any appearance defect which may severely affect the service life, such as the separation between components, spongy, rim tape, bead ring fracture, seriously drawn up bead ring, cords break, wrinkled cords in tyre cavity, and crown cord flashing etc. The flap, if any, shall not be incomplete or cracked. 4.7.2 Other requirements for the appearance quality of the cover and flap are detailed in HG/T 2177.
4.8 If inner tube and flap are used, the inner tube shall meet the requirements of GB 7036.1, and the flap shall match the cover.
5 Test Methods
5.1 Determine the section width and external diameter of inflated new tyre as well as the height of tread wearing marks according to GB/T 521.
5.2 Inspect the tyre strength according to GB/T 6327.
5.3 Inspect the tyre endurance according to GB/T 4501.
5.4 Inspect the high-speed performance of midget and light truck tyres according to GB/T 7035.
5.5 Inspect the appearance quality of tyre according to HG/T 2177.
6 Marking
6.1 The side wall of each cover shall be marked with the following marks a) ~ h). Among which, a) ~ f) shall be moulded on; g) shall be permanent and h) may be the mark that cannot be washed off.
a) Specification;
b) Trademark, manufacturer name or place name;
c) Load index or load capacity, ply rating, inflation pressure;
d) Speed symbol;
e) Name (or code) of the framework material used for crown and side wall; f) Marks of tread wearing marking position;
27 97.5 67 307 107 975 147 3075 187 9750 227 30750 267 97500
28 100 68 315 108 1000 148 3150 188 10000 228 31500 268 100000
29 103 69 325 109 1030 149 3250 189 10300 229 32500 269 103000
30 106 70 335 110 1060 150 3350 190 10600 230 33500 270 106000
31 109 71 345 111 1090 151 3450 191 10900 231 34500 271 109000
32 112 72 355 112 1120 152 3550 192 11200 232 35500 272 112000
33 115 73 365 113 1150 153 3650 193 11500 233 36500 273 115000
34 118 74 375 114 1180 154 3750 194 11800 234 37500 274 118000
35 121 75 387 115 1215 155 3875 195 12150 235 38750 275 121000
36 125 76 400 116 1250 156 4000 196 12500 236 40000 276 125000
37 128 77 412 117 1285 157 4125 197 12850 237 41250 277 128500
38 132 78 425 118 1320 158 4250 198 13200 238 42500 278 132000
39 136 79 437 119 1360 159 4375 199 13600 239 43750 279 136000

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