1 Scope
This standard specifies laboratory test methods for verifying the capabilities of truck and bus tyres, including terms and definitions, test equipment and precision, test conditions, test procedure, judgment criterion and test report. Of the test methods presented, only some may be required depending on the type of tyre to be tested.
This Standard includes the following tests:
(1) Durability test——Assess the endurance capability of tyres by the travel distance under the specified load and at the specified speed;
(2) High speed test——Assess the capability of the tyre according to its speed symbol;
(3) Strength test——Assess the capability of the tyre structure by testing braking energy of tyre crown.
The test methods presented in this standard are not intended for gradation of tyre capabilities or quality levels.
This standard is applicable to new pneumatic tyres of truck and bus.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For the undated references, the latest editions of the normative documents (including all the amendments) apply.
GB/T 2977 Size Designation，Dimensions，Inflation Pressure and Load Capacity for Truck Tyres
GB/T 6326 Tyre Terms and Definitions (GB/T 6326-2014, ISO 4223-1: 2002, NEQ)
GB 9744 Truck and Bus Tyres
3 Terms and Definitions
For the purpose of this standard, the following terms and definitions and those established in GB/T 6326 apply.
3.1
test speed
1 Scope
2 Normative References
3 Terms and Definitions
4 Test Equipment and Accuracy Requirements
5 Test Method
6 Judgment Rules
7 Test Report
Annex A (Informative) Chapter and Article No. Comparison between this Standard and ISO 1
Annex B (Informative) Technical Differences between this Standard and ISO 10454:1993 and their Reasons
Annex C (Normative) Corresponding Relationship between Tyre Speed Symbol and Speed
