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This document is drafted in accordance with the rules given in the GB/T 1.1-2020 Directives for Standardization — Part 1: Rules for the Structure and Drafting of Standardizing Documents.
This document replaces the GB/T 5334-2005 Performance Requirements and Test Methods of Passenger Car Wheels in whole. In addition to a number of structural adjustments and editorial changes, the following technical deviations have been made with respect to the GB/T 5334-2005:
a) The scope of application is changed to "This document is applicable to passenger car wheels as defined in GB/T 3730.1" (see Clause 1; Clause 1 of Edition 2005);
b) Normative reference GB/T 3730.1 is added (see Clause 2);
c) Terms and definitions are added (see Clause 3);
d) The requirements for test wheels are added (see Clause 4);
e) The indicators of performance requirements are changed to include additional performance requirements for test samples and spare wheels (see Clause 5; Clause 3 of Edition 2005);
f) The test methods are changed; the test items, test samples, preparation and other contents are deleted, and re-divided into four parts: test equipment, load determination, test procedure and failure criteria (see Clause 6, Clause 4 of Edition 2005);
g) The requirements for test equipment are changed, and the requirements for mounting surfaces of test wheel fasteners are added (see 6.1.1 and 6.2.1; 4.3.1 and 4.4.1 of Edition 2005);
h) Part of the test procedures are changed and tightening torque requirements for wheel installation are added (see 6.1.3 and 6.2.3; 4.3.2 and 4.4.2 of Edition 2005);
i) Example of bending fatigue test fixture is changed (see Figure 1; Figure 2 of Edition 2005);
i) Example of radial fatigue test fixture is added (see Figure 2);
This document has been redrafted and modified adoption of International Standard ISO 3006:2015 Road Vehicles — Passenger Car Wheels for Road Use — Test Methods.
There are structural adjustments between this document and the International Standard ISO 3006:2015. A complete list of structural adjustments between two documents is given in Annex A.
There are technical deviations between this document and the International Standard ISO 3006:2015, the contents involved in such deviations are marked with vertical single line (|) on the margins. The technical deviations, together with their justifications, are given below:
a) As for normative references, this document has been adjusted with technical deviations, and the adjustments are reflected in Clause 2 Normative References. The specific adjustments are as follows:
— Replace ISO 3911 with GB/T 2933 which is identical with the international standard (see Clause 2);
— Replace ISO 3833 with GB/T 3730.1 which is redrafted and modified adoption of the international standard (see Clause 2);
b) Terms and definitions is changed: the definition of "crack” of is changed, the definition of "wheel-tire assembly" is added, and other terms and definitions are deleted (see Clause 3);
c) The Annex A (informative) of ISO 3006:2015 is changed into performance indicators in Clause 5 (see Clause 5);
d) The examples of the test equipment are changed (see Figures 1 and 2);
e) The technical requirements for mounting surfaces of test fasteners are added (see 6.1.1 and 6.2.1);
f) The technical requirements for wheel loading offsets are added (see 6.1.4);
g) The pressure requirements for radial fatigue test tires are changed (see 6.2.2.2).
For the purposes of this document, the following editorial changes have also been made
— the standard name is changed to Passenger Car — Wheels — Performance Requirements and Test Methods for Cornering and Radial Fatigue.
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 the Ministry of Industry and Information Technology of the People's Republic of China.
This document is under the jurisdiction of National Technical Committee 114 on Road Vehicles of Standardization Administration of China (SAC/TC 114).
The previous editions of this document are as follows:
— The first edition was issued in 1985 as GB/T 5334-1985; this document was first revised in 1995, and the second revision was issued in 2005.
— This is the third revised edition.
Passenger Car — Wheels — Performance Requirements and Test Methods for Cornering and Radial Fatigue
1 Scope
This document specifies test wheels, performance requirements and test methods for dynamic bending fatigue test and dynamic radial fatigue test of passenger car wheels.
This document is applicable to passenger car wheels as defined in GB/T 3730.1.
2 Normative References
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2933 Wheels and Rims for Pneumatic Tyres — Vocabulary, Designation and Marking (GB/T 2933-2009, ISO 3911:2004, IDT)
GB/T 3730.1 Motor Vehicles and Trailers — Types — Terms and Definitions (GB/T 3730.1-2001, ISO 3833:1999, MOD)
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 2933, GB/T 3730.1 and the following apply.
3.1
wheel-tire assembly
assembly consisting of a wheels, tires, and valves
3.2
crack
material separation with a propagation of 3 mm and above occurring during a test
4 Test Wheels
Fully processed new wheels which are equivalent of wheels intended for the vehicle.
5 Performance Requirements
5.1 Performance requirements for dynamic bending fatigue test
Accelerated test factors and minimum cycle life requirements of dynamic bending fatigue test as shown in Table 1
Table 1 Accelerated test factors and minimum cycle life requirements of dynamic bending fatigue test
Material Coefficient of friction
μ Accelerated test factor
S Minimum cycles
Steel
0.7 1.60 30 000
1.33 150 000
30 000b
1.10 150 000b
Aluminium
0.7 1.60a 120 000
25 000b
1.33 300 000
60 000b
When conducting tests, two accelerated test factors shall be selected at the same time for steel wheels, and only one of the accelerated test factors can be selected for aluminum wheels.
a Preferred test factors for aluminum wheels.
b The minimum cycles applies only to spare wheels.
5.2 Performance requirements for dynamic radial fatigue test
Accelerated test factors and minimum cycle life requirements of dynamic radial fatigue test as shown in Table 2
Table 2 Accelerated test factors and minimum cycle life requirements of dynamic radial fatigue test
Material Accelerated test factor
K Minimum cycles
Steel 2.25 600 000
2.00 1 100 000
1.65a 600 000
Aluminium 2.50 900 000
2.25 1 150 000
2.00 1 150 000
1.80a 400 000
It is recommended to select the accelerated test factors based on obtaining the tyre life that meets the test requirements.
a Accelerated test factors apply only to spare wheels.
6 Test Methods
6.1 Dynamic bending fatigue test
6.1.1 Test equipment
The test equipment shall have a driven rotatable device and wheel fastener where either the wheel rotates under the influence of a stationary bending moment or the wheel is stationary and is subjected to a rotating bending moment (see Figure 1)
The loading system shall maintain the specified load and the deviation shall not exceed ±2.5% of the calculated value of the test load. The surface of wheel fastener shall be smooth and flat, and it has the same assembly size characteristics as the fastener usually used on the vehicle. The surface hardness is recommended in HRC40 to HRC50, and the position degree of the bolt hole on the distribution circle of the connecting surface is controlled within φ0.10mm.
a) Bending machine with stationary wheel b) Bending machine with rotary wheel
Key:
1 — pivot point;
2 — rim centre plane;
3 — wheel;
4 — wheel fastener;
5 — loading arm;
F — load;
L — moment arm;
D — offset of wheel.
Figure 1 Example of dynamic bending fatigue test fixture
6.1.2 Bending moment determination
Determine the bending moment M (force F × moment arm l), in newton metres (N·m), using Formula (1):
Foreword II
1 Scope
2 Normative References
3 Terms and Definitions
4 Test Wheels
5 Performance Requirements
6 Test Methods
Annex A (Informative) Structural Deviations between This Document and ISO 3006:
Bibliography
