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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 standard replaces GB/T 14172-2009 Static roll stability test method for motor vehicles. In addition to editorial changes, the following main technical changes have been made with respect to GB/T 14172-2009:
——The applicable scope is modified (see Clause 1 of this document and of Edition 2009);
——Terms and definitions of static roll stability, roll angle and maximum stable roll angle are modified (see 3.1, 3.2 and 3.3 of this document and of Edition 2009);
——Terms and definitions of stable roll angle is added (see 3.4);
——Maximum allowable error requirements of measuring instrument for tire pressure are added (see 4.1);
——The requirements for ascending and descending speed of the test bench are modified (see 4.2.2 of this document and of Edition 2009);
——The requirements for the test bench are modified (see 4.2.3 and 4.2.4 of this document and of Edition 2009);
——The requirements for anti-sideslip stopper (see 4.3of this document and of Edition 2009);
——The load state requirements of vehicles are modified (see 5.1.2 of this document and 5.1.5 of Edition 2009);
——The requirements for suspension lock are modified (see 5.1.3 of this document, and 5.1.4 of Edition 2009);
—— The requirements for environmental conditions are modified (see 5.2 of this document, and 5.1 of Edition 2005);
——The special requirements for trailers are added (see 5.3);
——The requirements for transmission and differential lock during test are added (see 6.1.1.2);
——The operational requirements for repeated tests are added (see 6.1.1.5);
——The requirements for data processing are modified (see 6.1.3 of this document, and Clause 7 of Edition 2009);
——The test method for stable roll angle with specified angle are added (see 6.2);
——The test records are modified (see Clause 7 and Annex A of this document, and Clause 8 and Annex A of Edition 2009).
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 standard was proposed by the Ministry of Industry and Information Technology of the People's Republic of China.
This standard is under the jurisdiction of the National Technical Committee of Auto Standardization (SAC/TC 114).
This standard was first issued in 1993 and first revised in 2009; this is the second revision.
Bench test methods of static roll stability for motor vehicles, trailers and combination vehicles
1 Scope
This document specifies the test equipment, test conditions, test methods and test records for bench test of static roll stability for motor vehicles, trailers and combination vehicles.
This standard is applicable to motor vehicles, trailers and combination vehicles. Other vehicles may also refer to the provisions of this standard.
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 1184-1996 Geometrical tolerancing-Geometrical tolerances for features without individual tolerance indications
GB/T 3730.1 Motor vehicles and trailer—Types—Terms and definitions
3 Terms and definitions
For the purposes of this standard, the terms and definitions specified in GB/T 3730.1 as well as the followings apply.
3.1
static roll stability
the inherent anti-roll ability of the vehicle when it is subjected to lateral force under static conditions
3.2
roll angle
the angle between the supporting surface of the vehicle tire and the horizontal surface as the vehicle rolls along with the roll test bench
3.3
maximum stable roll angle
the roll angle when the normal reaction of all tire support surfaces on the lifting side of the vehicle reaches zero
Note: For passenger-car/trailer combinations and goods-car/trailer combinations, take the roll angle when the normal reaction of all tire support surfaces on one side of any unit of tractors and trailers reaches zero.
The maximum stable roll angle is usually used to evaluate the static roll stability of vehicles.
3.4
stable roll angle
any roll angle before the vehicle reaches the maximum stable roll angle
4 Test equipment
4.1 Measuring instruments
See Table 1 for requirements for measuring instruments.
Table 1 Requirements for measuring instrument
Measuring instrument Measuring parameters Unit Maximum error
For wheel load Wheel load kg 1%
For dimension Dimension mm 1 mm
For angle Angle ( ° ) 0.1°
For tire pressure Tire pressure kPa 10 kPa
Anemometer Wind speed m/s 0.5 m/s
4.2 Roll test bench
4.2.1 The maximum inclination angle of the test bench shall meet the requirements of static roll stability of the vehicle to be tested. The inclination angle of the test bench shall be able to continuously adjust from zero to maximum roll angle, and can be fixed at any angle.
4.2.2 The maximum descending speed (uniform speed) and the minimum ascending speed (uniform speed) of the test bench shall be no more than 27°/min and 3°/min, respectively.
4.2.3 The lateral adhesion coefficient of the test bench shall be no less than 0.7.
4.2.4 The flatness of the test bench surface shall not be lower than the tolerance level of 12 specified in Table B.1 of GB/T 1184-1996, and the parallelism between the longitudinal axis and the center line of rotation of the test bench surface shall not be lower than the tolerance level of 12 specified in Table B.3 of GB/7 1184-1996.
4.3 Anti-sideslip stopper
To prevent the vehicle from sideslip during the test, an anti-sideslip stopper can be installed on the roll test bench. The anti-sideslip stopper shall be set at a height that minimizes its impact on the test results and is not greater than the larger value of 2/3 and 60 mm of the distance between the tire grounding plane and the lower edge of the rim before the vehicle rolls. The length of the stopper shall not be less than 500 mm, and the fillet radius at the top of the contact side between the stopper and the tire shall not be less than 10 mm.
Foreword I
1 Scope
2 Normative References
3 Terms and Definitions
4 Test equipment
5 Test Conditions
6 Test methods
7 Test records
Annex A (Informative) Test Records
Bibliography
