GB/T 19389-2016Test method of measuring rolling circumference for truck tyres (English PDF)

Foreword

This Standard was drafted as per the rules specified in GB/T 1.1-2009.

This Standard replaced GB/T 19389-2003 Test Method of Measuring Rolling

Circumference for Truck Tyres; compared with GB/T 19389-2003, this Standard has

the major technical differences as follows

--- Add Terms and Definitions (see Clause 3 of this Edition);

--- Add Rotary Drum Method for Measuring the Rolling Circumference of Tyre (see

Clause 4 of this Edition);

--- Amend the "climate during the test" into "test temperature and wind speed" (see

Sub-clause 5.3 of this Edition; Sub-clause 5.2 of 2003 Edition);

--- Modify the classification criteria of test speed by vehicle method, and the test

speed value (see Sub-clause 5.4 of this Edition; Sub-clause 5.3 of 2003 Edition);

--- Increase the provision only two shafts exist on the tested vehicle of the vehicle

method (see Sub-clause 5.6.1 of this Edition; Sub-clause 6.1 of 2003 Edition);

--- Modify the ratio of the test load to the maximum load, and the definition of

maximum load of the specified tyres (see Sub-clause 5.6.2 of this Edition; Sub-

clause 6.2 of 2003 Edition);

--- Add the national standard for the method of measuring the outer diameter of

tyres in vehicle method (see Sub-clause 5.7.1 of this Edition; Sub-clause 7.1 of

2003 Edition);

--- Modify the test speed and running time of the tyre trial running in vehicle method

(see Sub-clause 5.7.4 of this Edition; Sub-clause 7.3 of 2003 Edition);

--- Modify the duration of tyre pre-heating test in vehicle method (see Sub-clause

2003 Edition).

This Standard adopts re-drafting method to modify and use ISO 9112.2008 Truck and

Bus Tyres – Methods of Measuring Tyre Rolling Circumference – Loaded New Tyres.

Compared with ISO 9112.2008, this Standard has major technical differences and

causes as follows.

--- Modify the Normative References (see Clause 2 of this Edition);

--- In order to be more precise, add the requirements of "if the diameter tolerance of

rotary drum is ±1%, the tyre vertically presses on the driving rotary drum with

specified diameter" (see Sub-clause 4.2.1 of this Edition);

--- For the sake of safety and accuracy, add rotary drum method requirements of

"measuring position of test environment temperature" (see Sub-clause 4.3 of this

Edition);

--- Modify the test speed classification criteria of rotary drum method, more details

(see Sub-clause 4.4 of this Edition; Sub-clause 4.4 of ISO 9112.2008);

--- Increase the comparison of test results obtained by different rotary drum

diameters through empirical formula (2), so that improve the applicability of the

standard (see Sub-clause 4.9.2 of this Edition);

--- Increase the results obtained on the flat simulated road surface, which is

obtained through correcting the rolling circumference gotten by rotary drum

method through the empirical formula (3), so that improve the applicability of the

standard (see Sub-clause 4.9.3 of this Edition);

--- It is more accurate to modify the rolling circumference calculation value in the

vehicle method from "closest integer" into "one digit after the decimal point" (see

Sub-clause 5.9.1 of this Edition; Sub-clause 5.9.1 of ISO 9112.2008);

--- Increase the contents of the test report according to the due contents of test

report that shall be included in the country's standard for conventional test

methods (see Clause 6 of this Standard).

Test Method of Measuring

Rolling Circumference for Truck Tyres

1 Scope

This Standard specifies, under the load condition of truck tyre, two test methods to

measure the rolling circumference and revolution per unit distance (kilometer).

This Standard is applicable to all new truck tyres.

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 document.

GB/T 521 Test Method of Measuring Peripheral Dimensions for Tyres

GB/T 6326 Tyre Terms and Definitions (GB/T 6326-2014, ISO 4223-1.2002, NEQ)

3 Terms and Definitions

The following terms and definitions and those ones stipulated in GB/T 6326 are

applicable to this document.

4 Rotary Drum Method