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GB/T 4501-2008 PDF in English


GB/T 4501-2008 (GB/T4501-2008, GBT 4501-2008, GBT4501-2008)
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GB/T 4501-2008: PDF in English (GBT 4501-2008)

GB/T 4501-2008
GB
ICS 83.160.10
G 41
Replacing GB/T 4501-1998, GB/T 6327-1996, GB/T 7053-1993
Laboratory Test Methods for Truck and
Bus Tyres Capabilities
(ISO 10454.1993, Truck and bus tyres -
Verifying tyre capabilities - Laboratory test methods, MOD)
ISSUED ON. JUNE 18, 2008
IMPLEMENTED ON. FEBRUARY 1, 2009
Jointly Issued by. General Administration of Quality Supervision,
Inspection and Quarantine;
Standardization Administration of the People's
Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 6 
2 Normative References... 6 
3 Terms and Definitions ... 7 
4 Test Equipment and Precision Requirements ... 7 
5 Test Method... 8 
6 Judgment Rules ... 12 
7 Test Report ... 13 
Appendix A ... 15 
Appendix B ... 16 
Appendix C ... 18 
Foreword
This Standard modifies and adopts ISO 10454.1993 "Truck and bus tyres — Verifying
tyre capabilities — Laboratory test methods" (English edition).
This Standard replaces GB/T 4501-1998 "Endurance test for truck and bus tyres —
Drum method", GB/T 6327-1996 "Strength test method for truck and bus tyres" and
GB/T 7035-1993 "High speed performance test for light truck tyres — Drum method".
This Standard is redrafted based on ISO 10454.1993 "Truck and bus tyres — Verifying
tyre capabilities — Laboratory test methods". GB/T 4501-1998 "Endurance test for
truck and bus tyres — Drum method", GB/T 6327-1996 "Strength test method for truck
and bus tyres" and GB/T 7035-1993 "High speed performance test for light truck tyres
— Drum method" are revised and integrated in this Standard.
Appendix A lists out the comparison table of chapter and article numbers between ISO
10454.1993 and this Standard for reference.
Relevant technical differences between ISO 10454.1993 and this Standard have been
marked with vertical single line on the margin of relevant clauses; Appendix B lists out
these technical differences and their reasons for reference.
For the convenience of use, the following editorial changes are made in this Standard.
a) Replace "this International Standard" with "this Standard";
b) ", " used as the decimal point in former international standard is replaced by the
decimal point ".";
c) Delete the Foreword of the international standard;
d) Delete the Bibliography of the international standard.
The main differences between this Standard and GB/T 4501-1998 are as follows.
— The order of the clauses number is adjusted;
— Normative references are added and modified (Chapter 2 of GB/T 4501-1998
and Chapter 2 of this Standard);
— Test equipment and precision requirements are added and modified (Chapters 4
and 7 of GB/T 4501-1998 and Chapter 4 of this Standard);
— The requirements of test rim are modified (5.1.2 of GB/T 4501-1998 and 5.1.1.2
of this Standard);
— Tyre endurance and high speed testing conditions in the appendix of original
standard is deleted (Appendix A of GB/T 4501-1998);
— Test report is added and modified (Chapter 7 of this Standard).
The main differences between this Standard and GB/T 6327-1996 are as follows.
— Adjust the order of clauses in this Standard;
— Normative references are added and modified (Chapter 2 of GB/T 6327-1996
and this Standard);
— Test equipment and precision requirements are added and modified (Chapters 4
and 5.3 of GB/T 6327-1996 and Chapter 4 of this Standard);
— Appearance quality requirements of test tyre are added and modified (5.1.1 of
GB/T 6327-1996 and 5.3.1.1 of this Standard);
— The requirements of test rim are modified (5.1.2 of GB/T 6327-1996 and 5.3.1.2
of this Standard);
— Breaking energy are listed in metric series and inch series respectively in this
Standard, and the former national standard did not do so (GB/T 6327-1996 and
6.2 of this Standard);
— Minimum breaking energy classified on the base of tyre aspect ratio specified in
the former national standard (Chapter 3 of GB/T 6327-1996) are deleted in this
Standard;
— For the truck and bus tires with rim diameter ≥ 17.5, breaking energy test is
classified into with/without inner tube, and the former national standard did not
do so (Chapter 3 of GB/T 6327-1996 and 6.2 of this Standard);
— Test method of mean breaking energy specified in the former national standard
is changed to test the minimum breaking energy at each point in this Standard
(5.2.8 of GB/T 6327-1996 and 6.2 of this Standard);
— Test report is added and modified (Chapter 7 of this Standard).
The main differences between this Standard and GB/T 7035-1993 are as follows.
— Adjust the order of clauses in this Standard;
— Normative references are added and modified (Chapter 2 of GB/T 7035-1993
and Chapter 2 of this Standard);
— Test equipment and precision requirements are added and modified (Chapters 3
of GB/T 7035-1993 and Chapter 4 of this Standard);
Laboratory Test Methods for Truck and Bus Tyres
Capabilities
1 Scope
This Standard specifies test methods for verifying the capabilities of tyres for truck and
bus, including terms and definitions, test equipment and precision, test conditions, test
procedure, judgment criterion and test report, etc. In the test methods given, only some
may be required depending on the type of tyre to be tested.
This Standard includes.
(1) Endurance test — test the endurance capability of tyres by the travel distance
under specified load and speed;
(2) High speed test — test the capability of the tyre according to its speed symbol;
(3) Strength test — test the capability of the tyre structure with respect to braking
energy of tread cap.
The test methods presented in this Standard are suitable for grading of tyre capabilities
or quality levels.
This Standard is applicable to new pneumatic tyres of truck and bus.
2 Normative References
The following normative documents contain provisions which, through reference in this
text, constitute the provisions of this Standard. For dated references, subsequent
amendments or revisions of these publications do not apply. However, parties who
enter into agreements based on this Standard are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated
below. For undated references, the latest edition of the normative document referred
to applies.
GB/T 2977 Size designation, dimensions, inflation pressure and load capacity for
truck tyres
GB/T 6326 Tyre terms and definitions (GB/T 6326-2005, ISO 4223-1.2002,
Definitions of some terms used in tyre industry — Part 1. Pneumatic tyres, NEQ)
5.1.2.2 Mount the tyre and rim assembly on a test axle so that the tyre may be
pressed radially against the outer face of the test drum.
5.1.2.3 During the test, the ambient temperature shall be maintained at 38Ԩ±3Ԩ.
5.1.2.4 Conduct the test in accordance with those specified in Table3. Conduct test
according to specified procedure. In each successive phase of the test, without
interruption, re-adjust the pneumatic pressure and cool down tyre artificially, and the
test loads shall be maintained constant.
5.1.2.5 After tyre is completed for 3 periods of test according to the specified
procedures, stop the test immediately. Measure the pneumatic pressure and main
dimensions of tyre. Dismantle the tyre after natural cooling for 1h. Carry out
appearance inspection.
5.2 High speed test (mini, light truck and bus tyres)
5.2.1 Test conditions
5.2.1.1 Appearance quality of test tyre shall meet the requirements of GB 9744.
5.2.1.2 Mount the tyre on a test rim specified in GB/T 2977; inflate to the pressure
corresponding to the maximum load rating.
5.2.1.3 Maintain the inflated tyre and rim assembly at ambient temperature of 38Ԩ±3Ԩ
for at least 3 h.
5.2.1.4 The test drum shall start at uniform acceleration to the initial test speed within
10 min.
5.2.1.5 Test conditions shall be in accordance with those specified in Table 4. For
each period specified in Table 4, required time from speed-change to speed-steady
shall be within 1 min (except period 1).
5.2.1.6 In each successive phase of the test, without interruptions, re-adjust
pneumatic pressure; and the test loads shall be maintained constant.
5.2.1.7 In the test process, ambient temperature shall be within the range of 38Ԩ±3Ԩ.
5.2.2 Test procedure
5.2.2.1 Re-adjust the tyre pressure to the pneumatic pressure specified in 5.2.1.2.
5.2.2.2 Mount the tyre and rim assembly on a tester according to the aforesaid
conditions; the test load of tyre may be pressed radially against the outer face of the
test drum; test load shall be 90% of the maximum load of single tire.
5.2.2.3 Conduct successive test in accordance with those specified in Table 4.
f) Test air pressure and test load;
g) Test duration and...
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Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.