Foreword
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.
This document replaces GB/T 29041-2012 Road wear testing methods for motor vehicle tyres. In addition to structural adjustments and editorial changes, the following main technical changes have been made with respect to GB/T 29041-2012:
a) The application scope is modified to clarify that the standard is applicable to new tyres (see Clause 1 hereof; Clause 1 of Edition 2012);
b) Some terms are deleted (see 3.1 to 3.5 and 3.7 of Edition 2012); some terms are added (see 3.2 and 3.3 hereof);
c) The testing equipment and its requirements are added (see Clause 4 hereof);
d) The requirements for the testing load of passenger car tyres are modified (see 5.1.3.2 hereof; 4.1.3.2 of Edition 2012);
e) The requirements for the allowable deviation range of testing pressure for passenger car tyres are added (see 5.1.3.7 hereof);
f) The requirements for the testing mileage and rotation of passenger car tyres are modified (see 5.1.4.1 hereof; 4.1.5.1, 4.1.5.3 and 4.1.5.4 of Edition 2012);
g) The requirements for the testing speed of passenger car tyres are modified (see 5.1.4.4 hereof; 4.1.5.4 of Edition 2012);
h) The requirements for the testing mileage and rotation of mini/light truck tyres are modified (see 5.2.4.1 hereof; 4.2.5.1, 4.2.5.3 and 4.2.5.4 of Edition 2012);
i) The requirements for the testing speed of mini/light truck tyres are modified (see 5.2.4.4 hereof; 4.2.5.4 of Edition 2012);
j) The requirements for the testing mileage and rotation of truck tyres are modified (see 5.3.4.1, hereof; 4.3.5.1, 4.3.5.3 and 4.3.5.4 of Edition 2012);
k) The requirements for the testing speed of truck tyres are modified (see 5.3.4.4 hereof; 4.3.5.4 of Edition 2012);
l) The rotation diagram for the tractor testing is modified (see Figures C.7 and C.8 hereof; Figures C.7 and C.8 of Edition 2012).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This document was proposed by China Petroleum and Chemical Industry Federation.
This document is under the jurisdiction of National Technical Committee on Tyres and Rims of Standardization Administration of China (SAC/TC 19).
Road wear testing methods for motor vehicle tyres
1 Scope
This document describes the method for testing the road wear performance of motor vehicle tyres, including testing equipment and its requirements, testing records and rotation diagrams, etc.
This document is applicable to the comparative wear testing of new passenger car pneumatic tyres, mini/light truck pneumatic tyres, truck pneumatic tyres, and their retreaded tyres.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 521 Test method of measuring peripheral dimensions for tyres
GB/T 2977 Size designation, dimensions, inflation pressure and load capacity for truck tyres
GB/T 2978 Size designation, dimensions, inflation pressure and load capacity for passenger car tyres
GB/T 3730.1 Terms and definitions of motor vehicles, trailers and combination vehicle - Part 1: Types
GB/T 3730.3 Motor vehicles and towed vehicles - Dimensions of vehicles - Terms and definitions
GB/T 6326 Tyre terms
GB/T 7037 Retreaded tyre for truck
GB 9743 Passenger car tyres
GB 9744 Truck tyres
GB/T 14646 Retreaded tyre for passenger car
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 6326, GB/T 3730.1, and GB/T 3730.3 and the following apply.
3.1
convoy
two or more vehicles tested at the same period, on the same test road, and under the same and interrelated conditions in a tyre test
3.2
daily maintenance
maintenance operations focusing on cleaning, replenishment, and safety performance inspection
[Source: GB/T 5624-2019, 6.1.5.1]
3.3
complete maintenance
maintenance tasks mainly including inspecting and adjusting safety components such as the braking system, steering control system, and suspension; dismantling and inspecting tyres; performing tyre rotation; checking and adjusting engine operation, and vehicle emission related systems in addition to primary maintenance tasks
[Source: GB/T 5624-2019, 6.1.5.4]
Note: Primary maintenance refers to the maintenance operations that focus on lubrication and fastening, and check the safety components in braking and control systems in addition to routine maintenance operations.
4 Testing equipment and its requirements
4.1 Speed sensors or other speed testing instruments, with a sampling frequency ≥ 10 Hz and accuracy of ±1 km/h.
4.2 Thermometers or other temperature measuring instruments, with an accuracy of ±1°C.
4.3 Pressure gauges or other tyre pressure measuring instruments, with an accuracy of ±5 kPa.
4.4 Wheel load meters or other mass measuring instruments, with an accuracy of ±5 kg.
4.5 Dynamic balancing machines, with an accuracy of ±5g.
4.6 Pattern depth rulers or other pattern depth measuring instruments, with an accuracy of ±0.02 mm.
4.7 Vehicle GPS positioning systems.
5 Testing methods
6 Testing record and rotation diagram
Annex A
(Informative)
Road wear test record and rotation diagram for passenger car tyres
Annex B
(Informative)
Road wear test record and rotation diagram for mini/light truck tyres
Annex C
(Informative)
Road wear test record and rotation diagram for truck tyres
Bibliography
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Testing equipment and its requirements
5 Testing methods
6 Testing record and rotation diagram
Annex A (Informative) Road wear test record and rotation diagram for passenger car tyres
Annex B (Informative) Road wear test record and rotation diagram for mini/light truck tyres
Annex C (Informative) Road wear test record and rotation diagram for truck tyres
Bibliography
