1、Designation: D3527 11Standard Test Method forLife Performance of Automotive Wheel Bearing Grease1This standard is issued under the fixed designation D3527; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.
2、A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method covers a laboratory procedure forevaluating the high-temperature life performance of wheelbearing greases when test
3、ed under prescribed conditions.NOTE 1Changes to this test method in the 1985 revision increased testseverity. Results will not be comparable with data from earlier procedures.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1
4、.2.1 ExceptionApparatus dimensions in inches are to beregarded as the standard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and dete
5、rmine the applica-bility of regulatory limitations prior to use. For specificwarning statements, see 8.1-8.4.2. Referenced Documents2.1 AFBMA Standard:AFBMA Standard 19, 1974 (ANSI B. 3.19-1975)23. Terminology3.1 Definitions:3.1.1 lubricant, nany material interposed between twosurfaces that reduces
6、the friction or wear between them.3.1.2 lubricating grease, na semi-fluid to solid product ofa dispersion of a thickener in a liquid lubricant.3.1.2.1 DiscussionThe dispersion of the thickener forms atwo-phase system and immobilizes the liquid lubricant bysurface tension and other physical forces. O
7、ther ingredients arecommonly included to impart special properties.3.1.3 thickener, nin lubricating grease, a substance com-posed of finely-divided particles dispersed in a liquid lubricantto form the products structure.3.1.3.1 DiscussionThe solid thickener can be fibers (suchas various metallic soa
8、ps) or plates or spheres (such as certainnon-soap thickeners) which are insoluble or, at the most, onlyvery slightly soluble in the liquid lubricant. The generalrequirements are that the solid particles be extremely small,uniformly dispersed, and capable of forming a relatively stable,gel-like struc
9、ture with the liquid lubricant.3.2 Definitions of Terms Specific to This Standard:3.2.1 automotive wheel bearing grease, na lubricatinggrease specifically formulated to lubricate automotive wheelbearings at relatively high grease temperatures and bearingspeeds.3.2.2 grease life, nof wheel bearing gr
10、ease, amount oftime operated under prescribed conditions of load, speed, andtemperature until preset torque limit is exceeded.3.2.2.1 DiscussionThe off-time, which is part of the 20 hand 4 h off-cycle, is not recorded and is not included as part ofgrease life.4. Summary of Test Method4.1 The test gr
11、ease is distributed in the bearings of amodified, automobile front wheel hub-spindle-bearings assem-bly. While the bearings are thrust-loaded to 111 N, the hub isrotated at 1000 rpm and the spindle temperature maintained at160C for 20 h,4hoffoperating cycle. The test is terminatedwhen grease deterio
12、ration causes the drive motor torque toexceed a calculated motor cut off value. Grease life is ex-pressed as the accumulated on-cycle hours.5. Significance and Use5.1 This test method differentiates among wheel bearinggreases having distinctly different high-temperature character-istics. It is not t
13、he equivalent of longtime service tests, nor is itintended to distinguish between the products having similarhigh-temperature performance properties.5.2 This test method has proven to be helpful in screeninggreases with respect to life performance for automotive wheelbearing applications.1This test
14、method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.G0.05 on Functional Tests - Temperature.Current edition approved Nov. 1, 2011. Published December 2011. Originallyapproved in 1976. Last previous edition app
15、roved in 2007 as D3527071. DOI:10.1520/D3527-11.2Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Bo
16、x C700, West Conshohocken, PA 19428-2959, United States.6. Apparatus6.1 Test Assembly (see Fig. 1 and Fig. 2).6.1.1 Custom-made Wheel Hub-Spindle-Bearing Assembly(Fig. 3).6.1.2 Oven, electrically heated by a 1200 watt heater,thermostatically controlled to maintain spindle temperature at160 6 1.5C.6.
17、1.3 Spindle Drive Motor,14 hp, 120 volts dc with 1725rpm speed control the hub; motor torque is indicated by a meterequipped with an adjustable, automatic cut-off.6.1.4 Fan Drive Motor,130 hp, 120 v dc, 1550 rpm.6.2 Motor speed, oven temperature, spindle temperature,time cycles and torque are contro
18、lled or monitored, or both, byaccessory equipment.6.3 Balance having a minimum capacity of 100 g andminimum sensitivity of 0.1 g.7. Test Bearings7.1 Use LM67048-LM67010 and LM11949-LM11910 (AF-BMA Standard 19) inboard and outboard bearings,3respec-tively.8. Reagents and Materials8.1 n-Heptanereagent
19、 grade minimum purity(WarningFlammable. Harmful if inhaled.)8.2 Isopropyl Alcoholreagent grade minimum purity(WarningFlammable.)8.3 Penmul L460 (previously called Penetone ECS)4(WarningCombustible. Vapors can be harmful.)8.4 Mineral Spirits, Reagent Grade( WarningCombustible. Vapors may be harmful.)
20、8.5 SAE 10W Engine Oil.8.6 00 Grade Steel Wool.9. Preparation of Bearings9.1 Carefully remove new bearings (cups and cones) fromtheir packages and place in a suitable clean container. Washwith n-Heptane to remove all rust preventative.9.2 Repeat washing with n-Heptane two additional times tobe certa
21、in all rust preventative has been removed. Use a cleanbeaker each time.9.3 Drain n-Heptane from the bearings and set them on aclean, lint-free cloth or towel to air dry.NOTE 2Cleaning may be facilitated by the use of a sonic cleaner.10. Procedure10.1 Prior to each test, check the freedom of movement
22、 ofthe thrust loading shaft (Fig. 3) in the spindle. If binding isnoted, remove and clean both shaft and spindle bore.10.2 Install the new cups in the cleaned hub in the locationshown in Figs. 1 and 2.10.3 Weigh an inboard and outboard bearing cone to thenearest 0.1 g. Fill the cones with test greas
23、e using an extra setof cups and the grease packer shown in Figs. 4 and 5. Use careto avoid moving the rollers or bearing components whileremoving the cones from the cups and in all subsequent wipingand handling steps. Strike off excess grease flush with the frontface of the cone (near small end of r
24、ollers) using a smallspatula. Wipe all grease from cone bore, cone back face,exterior cage surfaces, and exposed roller surfaces with a clean,lint-free cloth or towel and reweigh. Adjust the grease weightin the inboard cone to 3.0 6 0.1 g and in the outboard cone to2.0 6 0.1 g by wiping or adding gr
25、ease to the groove betweenthe cage and the cone back face. Apply a thin film of grease onthe cups.3Timken or Bower bearings are suitable.4The sole source of supply of Penmul L460 (previously called Penetone ECS)known to the committee at this time is Penetone Corp., 74 Hudson Ave., Tenafly, NJ07670.
26、If you are aware of alternative suppliers, please provide this information toASTM International Headquarters. Your comments will receive careful consider-ation at a meeting of the responsible technical committee,1which you may attend.NOTECaution should be taken when modifying older units since some
27、may still contain asbestos insulation leading to a possible inhalation hazard.FIG. 1 Wheel Bearing Lubricant Tester (Elevation View)D3527 11210.4 Install the leakage collector, inboard cone, hub, andoutboard cone on the spindle (Fig. 2). Lock the components inplace with the end cap and screw. Instal
28、l the spindle connector.10.5 Referring to Fig. 3, adjust the thrust load as follows:tighten the compression nut G until the spring F is seatedagainst the back plate E, but not compressed. Bring the lock nutH up to the compression nut G. Without moving H, compressF by tightening G until the compressi
29、on gage J will fit betweenH and G. Hold J in position and back off G until J is held firmlybetween H and G.NOTE 3Compression gage J has been machined such that insertionand adjustment of G causes spring F to compress and apply a 111-N(25-lbf) axial load on the wheel bearings.10.6 Insert the thermoco
30、uple in the spindle thrust rod andposition the junction at the center of the outboard bearingposition. Close the cabinet and position the motor to operatinglocation. (WarningDo not engage the drive at this point.Start the motor and adjust the speed to 1000 6 50 rpm. At thispoint observe and record t
31、he unloaded motor current N.)10.7 Turn off the motor, engage the drive coupling and lockin position. Set the timer to begin a 20-h cycle. Restart themotor and again adjust the speed to 1000 6 50 rpm. Turn onthe heaters and adjust the oven temperature to maintain thespindle temperature at 160 6 1.5C
32、(320 6 2.7F). When theFIG. 2 Wheel Bearing Lubricant Tester (Top View)FIG. 3 Spindle and Thrust Rod ComponentsD3527 113spindle temperature has stabilized at the test temperature, makeno further adjustment of the oven temperature for the durationof the test.10.8 Asteady-state running torque will deve
33、lop in the first 2h of operation as indicated by a stabilized value on the meter.Record this value as steady-state current T. Determine themotor cutoff value as follows:C 5 8T 2 N! 1 N (1)where:C = motor cut-off value, amps,T = steady-state current, amps, andN = unloaded motor current, amps.Set the
34、automatic torque cutoff of motor to value of C.10.9 Permit the apparatus to operate under the prescribedconditions of load, speed, and temperature until the presettorque limit is exceeded at which point the test will beterminated automatically. Record the time the unit shuts down.NOTE 4The motor is
35、protected by a 30-s time delay.NOTE 5The 30-s delay described in Note 4 has been interpreted bysome users as a set requirement of the test method, when it was originallyintended only for information purposes about the protection of the electricmotor from prolonged exposure to high current (torque) l
36、evels. Workconducted by the D02.G0.05 Task Force indicates that test precision maybe improved by increasing this delay time to 90 s without significantlyaffecting test severity or increasing the risk of motor burn-out. However,the effect of this change has not been evaluated according to ASTMrequire
37、ments for development of test precision. Additionally, the TaskForce found that the cyclic nature of running torque means that the cut-offtorque value (and test severity) may be dependent on the sampling timeused to establish this parameter and taking the average value of severalreadings may be usef
38、ul.10.10 Allow the tester to cool to a safe handling temperatureand disassemble. If the tester is disassembled hot, use insulatedgloves.11. Parts Cleanup11.1 With a suitable spatula, remove as much grease aspossible from the grease collector, end cap, and spindleconnector.11.2 Place the parts in a s
39、uitable clean container (preferablystainless steel) and cover with Penmul L460 (WarningSee8.3). Install a loosely fitting cover and heat gently (70 6 10C)until the parts are clean (several hours). Avoid prolonged(overnight) heating as parts corrosion can occur.11.3 Remove the parts from the solvent
40、and wash with hotrunning water. Rinse immediately with isopropyl alcohol (WarningSee 8.2). Air dry. If the parts will not be usedimmediately, apply a film of SAE 10W engine oil.11.4 Use a suitable spatula to scrape grease off of thespindle. Remove the remaining deposits from the spindle using00 grad
41、e steel wool and mineral spirits (WarningSee 8.4). Ifstrongly adherent deposits resist this treatment, remove thespindle and clean in hot Penmul L460.12. Report12.1 Report the hours to failure.13. Precision and Bias513.1 The precision of this test method was determined bystatistical examination of i
42、nterlaboratory results. ResearchReport D02-10076procedures were followed in the round-robin testing and statistical analysis of data. In 1988 a moreprecise description of the bearing packing procedure was5Supporting data have been filed at ASTM International Headquarters and maybe obtained by reques
43、ting Research Report RR:D02-1177.6Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:D02-1007.FIG. 4 Bearing PackerFIG. 5 Bearing PackerD3527 114included in 10.3. The precision data shown in Table X2.1 wasobtained earlier using a le
44、ss detailed packing procedure.13.1.1 RepeatabilityThe difference between two test re-sults obtained by the same operator with the same apparatusunder constant operating conditions on identical test materialwould, in the long run, in the normal and correct operation ofthe test method, exceed the foll
45、owing values in only one casein twenty:Repeatability 5 0.8!X (2)where:X = the average of the two test results.13.1.2 ReproducibilityThe difference between two singleand independent results obtained by different operators work-ing in different laboratories on identical test material would, inthe long
46、 run, in the normal and correct operation of the testmethod, exceed the following values in only one case intwenty:Reproducibility 5 1.2!X (3)where:X = the average of the two test results.13.2 BiasThe procedure in this test method has no biasbecause the value of grease life can be defined only in te
47、rms ofthe test method.NOTE 6A round robin of twelve cooperators testing five greases hasresulted in the precision statement shown above. The data are shown inTable X2.1. In this round robin, determinations were made using testers byPAM, Koehler, and Falex. No distinction was made as all testers gave
48、equivalent results.14. Keywords14.1 automotive wheel bearing grease; grease life perfor-mance; lubricating greaseAPPENDIXES(Nonmandatory Information)X1. METRIC EQUIVALENTSX1.1 See Table X1.1.X2. WHEEL BEARING LIFE TEST (HOURS)X2.1 See Table X2.1.TABLE X1.1 Metric Equivalents for Figs. 1, 4, and 5in.
49、 mm in. mm18 3.175 1.546 39.26814 6.350 1.547 39.29412 12.700 1.796 45.6180.661 16.789 1.797 45.6440.662 16.815 2.342 59.4870.735 18.669 2.343 59.5120.736 18.694 212 63.5000.749 19.025 2.590 65.7860.75 19.050 2.6 66.0400.787 19.990 2.594 65.8881.00 25.400 4.0 101.6001.235 31.369 6.0 152.4001.236 31.394 618 155.5701.531 38.887 834 222.2501.532 38.913 1212 317.500D3527 115SUMMARY OF CHANGESSubcommittee D02.G0 has identified the location of selected changes to this standard since the last issue(D3527071) that may impact the use of
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