This standard specifies the requirements and test methods for the unbending resistance test of passenger tubeless tires. This standard applies to passenger tubeless tires. GB/T 4504-1998 Passenger tubeless tire unbending resistance test method GB/T4504-1998 Standard download decompression password: www.bzxz.net

CB/T 4504:1998 This standard is based on the unbending test part of ISO 10191:1993 "Test method for unbending force of passenger car tires - In-air test method" (first edition), and is a revision of GB/F4504-1984 "Test method for unbending force of tubeless tires for passenger cars". It is equivalent to the international standard in terms of main technical contents. Through the revision, the performance inspection of passenger car tires in our province is aligned with the international standards to meet the needs of international trade, technical and economic exchanges and the need to align with international standards. The main differences between this standard and the original standard are as follows: (1) In terms of technology, the oblique The numbering method for radial tires and bias tires is given equal importance, with radial tires as the focus. The test pressure of bias tires is in the form of "note": (2) The test inflation pressure is adjusted, and the original standard is changed to test according to the air pressure corresponding to the layer. (3) The tire test size with rim nominal diameter code 17, 18 and 19 is added. 2 Technical standards and international standards are calculated on the difference between the technical standards and the international standards. (1) According to national conditions, the test of bias tires for passenger cars is retained. The technical regulations for the implementation of the annual line tires of passenger cars are implemented. (2) According to the existing equipment conditions in our country, the shape and size of the bead block are selected. 10191:1993 of the B-type pressure block. (3) Deleted the test items and indicators of the temporary replacement type 1 tire specified in the national standard. (1) Added the specification of parking for 3 hours after the tire is inflated. This standard replaces GB/T 450441984 from the date of implementation.
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Tire and Rim Standardization Technical Committee. The drafting unit of this standard is: Beijing Rubber Industry Research and Design Institute of the Ministry of Chemical Industry. The main drafters of this standard are: Liu Shipang, Zhu Kexian. This standard was first issued in June 1984. This standard is entrusted to the National Tire and Rim Standardization Technical Committee for interpretation. GB/T45041998
ISO Foreword
YKAONi ISO (International Electrotechnical Commission) is a worldwide association of international standardization bodies (ISO standardization bodies). The work of developing international standards is mainly carried out through ISO technical committees. Each member body interested in a profession for which a technical committee has been established has the right to send representatives to participate in the technical committee of that profession. International organizations (both official and unofficial) that have relations with ISO can also participate in this work. In all aspects of electrical technical standardization, ISO International Electrotechnical Commission works closely together. The international standard drafts formally adopted by the technical committees shall be sent to each member body for round-robin voting. At least 7% of the member bodies vote to publish the international standard. International Standard ISO10191 was developed by the Technical Committee 1SC)/1C31/SC3 Wheel Rims and Valves Technical Committee Passenger Car Tires and Wheels Technical Committee. Appendix A is an integral part of this international standard: Appendix B is for reference only. 1 Scope
National Standard of the People's Republic of China
Bead unseating resistance test for tubeless passenger car tyres Small standard specifies the requirements and test force method for tubeless passenger car tire unseating resistance test. This standard applies to tubeless passenger car tires. 2 Referenced standards
GB/T 4504 : -- 1998
eq 1so 10191:1993
Agency GB/T4504198-1
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were all valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards. GJ3/T2978—1997 Passenger car tire series
3 Requirements
Conduct the tubeless tire unbending resistance test according to the conditions of this standard. The unbending force value of each tubeless tire shall not be less than the requirements of Table 1. Table 1 Minimum unbending resistance value of passenger car tubeless tire Nominal section of tire (S).mm
S-:160
160S293
4 Main technical parameters of tire unbending resistance testing machine Force value.N
4.1 The tire unbending resistance testing machine consists of a tire support, a unbending press block, etc., as shown in Figure 1. Standard unbending press block shape and size! As shown in Figure 2: When testing wheels with different wheel diameters, the value of the water half distance "P* from the supporting auxiliary center of the wheel well to the release block is shown in Table 2.
Adoption instructions:
1ISC011093 has two shapes and types of pressure blocks, type A and type. This standard uses pressure blocks. National Quality and Technical Supervision Wei approved on October 19, 1998 and implemented on April 1, 1999
Rim nominal diameter code
GB/T 4504 1998
Branch axle
Table 2 When testing tires with different wheel nominal diameters, \P\ size 12
Community: 65 and below series tires use \\ size, and the following formula is used to obtain Wu Zhong:
The water T distance of the center of the tire rotating object from the release mesh pressure block is the tire outer diameter;
Wheel cell section height,
4. 2 The descent speed of the unbend block pressing the sidewall is 59 mm/min ± 2.5 mm/min 5 Test method 5.1 Test conditions 5.1.1 The test tire grease shall comply with the provisions of G/T2978 16
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GB/T 4504
2 The tire bead area must be clean and installed on a standard wheel rim with a smooth appearance, no lubricant or adhesive, and no damage or deformation. It must comply with the provisions of 5.1.2
GR/T2978, and filled with the air pressure specified in Table 3. Table 3 Inflation pressure of unbend resistance test for passenger car tubeless tires Tire classification
Type
Type
Type
Type
Type
: Tubeless tire inflation pressure: 4PR Standard tires, SPR/extra-heavy load tires. 5.1.3 Place the tire-wheel coupling assembly at a temperature of 18 to 36°C for at least 3 hours, and then adjust the pressure to the specified value. 5.2 Test steps
5.2.1 Install the wheel-wheel sheath assembly on the test machine and adjust the position of the block according to the toe-off specified in Table 2. 5.2.2 Determine at least one equally spaced point on the circumferential surface of the tire sidewall, and then. 2. 3. Test point by point as specified in 4.2. 5.2.3 Apply pressure to the outer surface of the sidewall at the falling angle specified in 4.2 until the tire is separated from the sheath or the minimum separation resistance value specified in Table 1 is reached. Record the resistance when the tire is separated or the test is stopped. 6. Test record
The following data should be measured and recorded in the tire test a) Manufacturer name, trademark, structure, specification, ply level, production number: h) Rim specifications:
() The follow-up force value of the symbol point; | |tt||d) Conclusion: \Pass the test\ or \fail the test\;) Test period,
7 Allowable deviation of test conditions
In addition to the allowable deviation of the tire standard surface, the allowable deviation of the test parts is shown in Table 1. Table 1 Allowable deviation of test conditions
Allowable deviation
Pa
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