1、Designation: F2663 07aF2663 15Standard Test Method forBead Unseating of Tubeless Tires for Motor Vehicles withGVWR of 4536 kg (10 000 lb) or LessPassenger and LightTruck Tires1This standard is issued under the fixed designation F2663; the number immediately following the designation indicates the ye
2、ar oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the static non-rolling laborat
3、ory method of determination of a tubeless tires resistance to beadunseating. The test requires the use of a standardized fixture and load machine. The test is conducted using a defined test pressureand method of determining the resultant force to unseat the tire from the rim.1.2 This test method is
4、applicable for all passenger, light truck, and temporary spare tires used on motor vehicles with 4536 kg(10 000 lb) Gross Vehicle Weight Rating (GVWR) or less.tires.1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.1.4 This sta
5、ndard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 AS
6、TM Standards:2F538 Terminology Relating to the Characteristics and Performance of TiresF1502 Test Method for Static Measurements on Tires for Passenger Cars, Light Trucks, and Medium Duty Vehicles3. Terminology3.1 Definitions:3.1.1 bead, of a tire, npart of a tire that comes in contact with the rim
7、and is shaped to secure the tire to the rim. F5383.1.2 bead unseating block, nmachined block of cast aluminum (also known as “shoe”) used on the bead unseating fixtureto press against the tire sidewall. F5383.1.3 elements, nan isolated (totally bounded by void) projection. F5383.1.3 manufacturer, of
8、 a tire, nof a tire, the name of a company or wholly owned subsidiary making the tire. F5383.1.4 measuring rim, nany “rim” with a width as specified for the design or measuring rim for a particular tire sizedesignation, and with the “bead” seat and flange dimensions in accordance with publications o
9、f tire and rim standards organizationscurrent at the time of manufacture. F5383.1.5 outside diameter, nthe maximum diameter of thea tire when it is mounted and inflated. F5383.1.6 overall width, nthe maximum cross-sectional width of a tire, including protective or decorative ribs. F5383.1.7 rim, nth
10、e specially shaped circular periphery to which a tire may be mounted with appropriate bead fitment. F5383.1.8 rim, test, na rim having the configuration and dimensions suitable for use with a test tire in accordance with publicationsof a tire and rim standards organization current at the time of tir
11、e manufacture. F5383.1.9 sidewall, of a tire, nthat portion of a tire between the tread and the bead. F5381 This test method is under the jurisdiction of ASTM Committee F09 on Tires and is the direct responsibility of Subcommittee F09.30 on Laboratory (Non-Vehicular)Testing.Current edition approved
12、Dec. 15, 2007June 1, 2015. Published January 2008July 2015. Originally approved in 2007. Last previous edition approved in 2007 asF2663 07.F2663 07a. DOI: 10.1520/F2663-07A.10.1520/F2663-15.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at servic
13、eastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Be
14、causeit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100
15、 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.1.10 specified design section width, nwidth specified in the publications of tire and rim standards organizations current atthe time of manufacture for a new tire of that size designation and type when inflated on its
16、 “measuring rim.” F5383.1.11 tire, light truck, na tire of a group prescribed in “Light Truck” or “Commercial” tire sections of industry standardsmanuals such as The European Tyre and Rim Technical Organisation (ETRTO), JapanAutomobile Tyre ManufacturersAssociation(JATMA), and The Tire and Rim Assoc
17、iation (TRA). The tire will typically have either “LT” or “C” (C-type) as part of the tiresize designation.3.1.11.1 DiscussionAn LT tire is a light truck tire with the letters “LT” either as a prefix or suffix of the tire size nomenclature. These tires are typicallystandardized by JATMA or TRA. A C-
18、type tire is a light truck (commercial) tire with the letter “C” as a suffix to the tire sizenomenclature. These tires are standardized by ETRTO, and located in the “Commercial” tire section of the Standards Manual.3.1.12 tire, passenger car, na tire of a group prescribed in a passenger tire section
19、 of industry standards manuals such as TheEuropean Tyre and Rim Technical Organisation (ETRTO), Japan Automobile Tyre Manufacturers Association (JATMA), or TheTire and Rim Association (TRA).3.1.13 tire, pneumatic, na hollow tire that becomes load-bearing upon inflation with air, or other gas, to a p
20、ressure aboveatmospheric. F5383.1.14 tread, of a tire, nthe part of the tire that comes in contact with the ground. F5383.1.15 unseating, vthe dislodgment of the bead area of a tire from the portion of the rim designed to hold the bead in placeresulting in loss of inflation pressure. F5383.1.16 whee
21、l, na rigid structure consisting of a rim connected to a central disk that permits rotationally centered attachmentto an axle. F5384. Summary of Test Method4.1 This test method measures the force needed to unseat a tire from a clean, dry, painted test rim.rim/wheel.The force is appliedthrough a spec
22、ified bead unseating block and pivoting load arm set substantially parallel to the tire rimrim/wheel assembly at thestart of the test. The force is measured at a specific point of the fixture. The point to be contacted on the tire sidewall is determinedwithin this test method.5. Significance and Use
23、5.1 This test method establishes a standard procedure for the test and provides data that can be related to the force required tounseat the bead of a tire inflated with a specified pressure from the rim. This test method does not establish performance limitsor tolerances for tire specifications.6. A
24、pparatus6.1 A fixture to hold the tire-rimtire-rim/wheel assembly as shown in Annex A1 or equivalent.6.2 Testing machine which incorporates a block traveling at 50.8 6 1.581.6 mm/min (2.0 6 0.0625 in./min) which can exerta force on the fixture at the spherical attachment point (in line with the cent
25、erline of the bead unseating block) or equivalent.6.3 A force indicating device that shall have an accuracy of 61% 61 % of the indicated force in the operating range and shallreflect an instantaneous change in force from zero to full scale in no more than 3.0 s.6.4 Means for calibration of the testi
26、ng machine for applied load and rate of application speed are necessary.6.5 Means for mounting the tire on a test rimrim/wheel and mounting the test assembly on the testing machine is necessary.6.6 Test rims.rims/wheels.6.7 Pressure gauge, capable of measuring the pressure within 63.5 kPa (0.5 psi).
27、7. Sampling7.1 A sample is one or more tires taken from a lot as directed in any applicable specification, or as taken from a shipping unit,or as agreed upon between the purchaser and the seller.7.2 Record the manufacturersmanufacturers identification, brand name, tire identification number, tire ou
28、tside diameter,rimrim/wheel diameter code and width, tire size, load range, tire load identification information (including, as appropriate: loadrange, load index, standard load, extra load, light load, etc.), and type of tire.Visually inspect the tire completely for excessive moldlubricant and any
29、obvious faults or conditions that could affect the test.F2663 1528. Preparation of Apparatus8.1 Check fixture for bent arm, loose or binding pivot and flat seating of rimrim/wheel on the support flange.8.2 On certain equipment designs, check alignment of spherical adaptor and ram from load machine.9
30、. Calibration and Standardization9.1 Calibration standards shall be comprised of instrumentation and measuring apparatus that are used for verification of theaccuracies of the indicating-recording instruments, pressure setting and travel speeds. Calibration standard accuracy will beascertained by co
31、mparison of the standard with primary standards maintained by the National Institute of Standards andTechnology (NIST) or secondary standards traceable to NIST or applicable national standards. The frequency of calibration shallbe as often as necessary to ensure that all functions are within toleran
32、ces listed in Section 76.10. Conditioning10.1 The ambient temperature for tire conditioning and in the test area shall be any known temperature within the range of 246 8C (75 6 15F) (see Test Method F1502).10.2 Tire must be aged a minimum of 24 h after curing.11. Procedure11.1 The tire must be at ro
33、om temperature before mounting. Wash the tire, dry the bead area and mount the tire on a dry, clean,corrosion free test rimrim/wheel without lubrication or adhesives.11.2 Inflate the tire to, but do not exceed, the maximum inflation pressure indicated on the tire sidewall, to seat the bead. Verifypr
34、oper bead seating.11.3 Immediately reduce the pressure to the specified pressure based on the requirements of the bead unseat standard or Table1 or Table 2.TABLE 1 Passenger Car Tire Inflation PressureNOTE 1Conversions are based on historical precedents. See bibliog-raphy (19).Tire Load Identificati
35、on Test Inflationpsi (kPa) Maximum Inflationpsi (kPa)Tire Load Identification Test InflationkPa (psi) Maximum InflationkPa (psi)Alphanumeric type tiresLoad range B 24 (165) 32 (220)Load range B 165 (24) 220 (32)Load range C 28 (195) 36 (250)Load range C 195 (28) 250 (36)Load range D 32 (220) 40 (275
36、)Load range D 220 (32) 275 (40)“Passenger” type tiresStandard load 26 (180) 35 (240)Standard load 180 (26) 240 (35)26 (180) 36 (250)180 (26) 250 (36)26 (180) 44 (300)180 (26) 300 (44)26 (180) 51 (350)180 (26) 350 (51)Extra load 32 (220) 41 (280)Extra load 220 (32) 280 (41)32 (220) 42 (290)220 (32) 2
37、90 (42)32 (220) 50 (340)220 (32) 340 (50)“T” type tiresTemporary use 52 (360) 60 (420)Temporary use 360 (52) 420/415 (60)F2663 153NOTE 1Certain kPa and psi pressure equivalencies in Table 1 and Table 2 are different based on their sources.11.4 Condition the mounted tire and rim test assembly for 24
38、h (may be concurrent from curing) at the ambient roomtemperature. The test tireassembly during conditioning or testing shall not be exposed to fluctuations in temperature exceeding+2.6C, 5.8C (+5F, 10F) of the starting conditioning temperature.11.5 Readjust the pressure as required in 11.3, the infl
39、ation pressure tolerance shall be 63.5 kPa (0.5 psi).11.6 Measure the overall and section widths of the tire at six points equally spaced around the tire and record the average ofthese measurements (see Test Method F1502 or equivalent for details).11.7 Measure the outside diameter of the tire by mea
40、suring the circumference and dividing by Pi (3.1416) or use of Diameter(Pi ) Tape (see Test Method F1502 or equivalent for details).11.8 The tire shall be marked radially at 5 equally spaced locations on the valve side of the sidewall.11.9 Mount the tire-rimtest assembly in the test fixture shown in
41、 Annex A1.11.10 Position the bead unseating block (2A, 2B, 2C) selected based on the table in Annex A1 against the tire sidewall at the“A” distance for the rim diameter or determined by using the following calculation for the “A” dimension, whichever isless:calculation.A 50.7530.5OD2RD!#10.5RD (1)wh
42、ere:OD = tire outer diameter or nominal diameter from applicable standardRD = nominal rim diameterRD = nominal rim codeNOTE 2The tolerance for the “A” dimension (calculated or listed above) is 61.5 mm (0.06 in.).11.11 Position the unseating block to touch the tire sidewall with a force less than 2.5
43、 daN (5 lbf). Level the arm so that it isparallel, 62, to the tire.11.12 Check and, if necessary, readjust the inflation pressure.11.13 Apply the load through the unseating block at a rate of 50.8 6 1.6 mm/min (2.0 6 0.0625 in./min) with the forcemeasured through the block in a vertical direction at
44、 the center line of the beam until the bead unseats, air loss is audible (pressureis reduced), or limit from applicable standard is reached without the block contacting the rim. Record the maximum force.Depending on equipment design, subtract the (tare) weight of the load arm if not previously consi
45、dered during setup or calibration.11.14 If, during the application of load (11.13), the bead unseats, reinflate the tire to the maximum pressure indicated on thesidewall to reseat the bead, verify proper bead seating, and immediately reduce the pressure to the specified pressure based on therequirem
46、ents of the bead unseat test pressure table.11.15 Repeat 4 times at equally spaced locations around the tire (making total of 5 measurements).12. Calculation or Interpretation of Results12.1 Result is the least or minimum value obtained in 11.13.TABLE 2 Light Truck (LT) Tire Inflation PressureNOTE 1
47、Conversions are based on historical precedents. See bibliog-raphy (1, 6, and 7).Tire Load Identification Test Inflationpsi (kPa) Tire Load RatingTire Load Identification Test InflationkPa (psi) Tire Load Range“LT” and “C” type tiresCross section # 295 mm (11.5 in.)38 (260) LR C“LT” and “C” typetires
48、Cross section #295 mm (11.5 in.)260 (38) LR C49 (340) LR D340 (49) LR D59 (410) LR E410 (59) LR E“LT” and “C” type tiresCross section 295 mm (11.5 in.)28 (190) LR C“LT” and “C” typetiresCross section 295 mm (11.5 in.)190 (28) LR C38 (260) LR D260 (38) LR D49 (340) LR E340 (49) LR EF2663 15413. Repor
49、t13.1 The report should include the following:13.1.1 A title (for example, “Bead Unseat Test ASTM F2663”);13.1.2 The name and address of the laboratory, and the location where the tests or calibrations, or both, were carried out, ifdifferent from the address of the laboratory;13.1.3 Unique identification of the test report (such as report or request number), and number of report page and clearidentification of report end. Name and address of client if different from company performing the test;13.1.4 Date test is performed;13.1.5 Date of
