汽车制动片制动垫片和离合器衬片的硬度试验方法.docx
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汽车制动片制动垫片和离合器衬片的硬度试验方法.docx
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汽车制动片制动垫片和离合器衬片的硬度试验方法
汽车制动片、制动垫片和离合器衬片的硬度试验方法
SURFACEVEHICLERECOMMENDEDPRACTICEJ2522ISSUEDJUN20032003-06Issued
DynamometerGlobalBrakeEffectiveness
Foreword—Theglobalizationtrendintheautomotiveindustrynecessitatestheproperdefinitionofapplicabletestproceduresforassessmentandcomparisonofdifferentfrictionmaterials.Thesecomparisontestsshouldproveusefulasacommongroundforthedevelopment,selection,andqualityassuranceoffrictionlinings.
TheAKWorkingGroup,whichrepresentsEuropeanmanufacturersoffrictionliningsandpassengercarbrakes,hasdevelopedan“AKMaster”Standardinrecentyears.TheSAEBrakeDynamometerTestCodeStandardsCommitteeconsidersthisstandardusefulinsupportingthetechnologicaleffortsintendedtoimprovemotorvehiclebrakingsystemsoverallperformanceandsafety.ThereforethiscommitteeismakingtheAKMasterstandardavailabletotheindustryasanSAERecommendedPractice.
Thisdocumentshouldbeusedinconjunctionwithotherapplicablestandardsortestprocedures(SAE,FederalCodesorotherspecifictestingprograms)tofullyassessafrictionmaterial’sadequacyforacertainapplicationorvehicleplatform.
1.
1.1ScopeThisSAERecommendedPracticedefinesanInertiaDynamometerTestprocedurethatassessestheeffectivenessbehaviorofafrictionmaterialwithregardtopressure,temperatureandspeedformotorvehiclesfittedwithhydraulicbrakeactuation.
ThemainpurposeofSAEJ2522istocomparefrictionmaterialsunderthemostequalconditionspossible.Toaccountforthecoolingbehaviorofdifferentteststands,thefadesectionsaretemperature-controlled.
References—Therearenoreferencedpublicationsspecifiedherein.
Definitions—Tofacilitatetheapplicationofthisdocument,thefollowingtermsanddefinitionsshouldapply.FrictionValueforaBrakeApply—ArithmeticaverageofallindividualfrictionvaluesforabrakeapplyNominalFrictionValue—Averagefrictionvalueforallbrakeapplieswithoutfadingseriesandwithouttemperatureseries
MinimumFrictionValue—Lowestarithmeticalaverageoftheindividualfrictionvaluesforthefadesectionsandtemperatureseries1.22.3.3.13.23.3
SAETechnicalStandardsBoardRulesprovidethat:
“ThisreportispublishedbySAEtoadvancethestateoftechnicalandengineeringsciences.Theuseofthisreportisentirelyvoluntary,anditsapplicabilityandsuitabilityforanyparticularuse,includinganypatentinfringementarisingtherefrom,isthesoleresponsibilityoftheuser.”
SAEreviewseachtechnicalreportatleasteveryfiveyearsatwhichtimeitmaybereaffirmed,revised,orcancelled.SAEinvitesyourwrittencommentsandsuggestions.Copyright?
2003SocietyofAutomotiveEngineers,Inc.
Allrightsreserved.Nopartofthispublicationmaybereproduced,storedinaretrievalsystemortransmitted,inanyformorbyanymeans,electronic,mechanical,photocopying,recording,orotherwise,withoutthepriorwrittenpermissionofSAE.
TOPLACEADOCUMENTORDER:
Tel:
877-606-7323(insideUSAandCanada)
Tel:
724-776-4970(outsideUSA)
Fax:
724-776-0790
Email:
custsvc@sae.org
:
//sae.orgSAEWEBADDRESS:
-2-
-3-
-4-
SAEJ2522IssuedJUN2003
TABLE3—BURNISHSECTION(CONTINUED)
Parameter
Pressuresnub25(kPa)Pressuresnub26(kPa)Pressuresnub27(kPa)Pressuresnub28(kPa)Pressuresnub29(kPa)Pressuresnub30(kPa)Pressuresnub31(kPa)Pressuresnub32(kPa)Numberofcycles
Frontaxle260015003400220018003000180038006
RearaxleDiscbrake260015003400220018003000180038006
RearaxleDrumbrake
260015003400220018003000180038006
6.3CharacteristicValue1—6snubs80to30km/hat3000kPa.SeeTable4.
TABLE4—CHARACTERISTICVALUE1SECTION
Parameter
NumberofstopspercycleBrakespeed(km/h)Releasespeed(km/h)Pressure(kPa)
Initialbraketemperature(°C)Finalbraketemperature(°C)Numberofcycles
Frontaxle
680303000≤100Open1
RearaxleDiscbrake
680303000≤100Open1
RearaxleDrumbrake
680303000≤80Open1
6.46.4.1
Speed/PressureSensitivitySections—Pressuresensitivityatvariousbrakeandreleasespeeds.SPEED/PRESSURESENSITIVITY40km/h—8stops40to5km/hatincreasingpressures.SeeTable5.
TABLE5—SPEED/PRESSURESENSITIVITY40km/hSECTION
Parameter
NumberofstopspercycleBrakespeed(km/h)Releasespeed(km/h)Initialbraketemperature(°C)Finalbraketemperature(°C)Pressurestop1(kPa)Pressurestop2(kPa)Pressurestop3(kPa)Pressurestop4(kPa)Pressurestop5(kPa)Pressurestop6(kPa)Pressurestop7(kPa)Pressurestop8(kPa)Numberofcycles
Frontaxle
840≤5≤100Open100020003000400050006000700080001
RearaxleDiscbrake
840≤5≤100Open100020003000400050006000700080001
RearaxleDrumbrake
740≤5≤80Open2000300040005000600070008000—1
-5-
SAEJ2522IssuedJUN2003
6.4.2SPEED/PRESSURESENSITIVITY80km/h—8snubs80to40km/hatincreasingpressures.SeeTable6.
TABLE6—SPEED/PRESSURESENSITIVITY80km/hSECTION
Parameter
NumberofsnubspercycleBrakespeed(km/h)Releasespeed(km/h)Initialbraketemperature(°C)Finalbraketemperature(°C)Pressuresnub1(kPa)Pressuresnub2(kPa)Pressuresnub3(kPa)Pressuresnub4(kPa)Pressuresnub5(kPa)Pressuresnub6(kPa)Pressuresnub7(kPa)Pressuresnub8(kPa)Numberofcycles
Frontaxle
88040≤100Open100020003000400050006000700080001
RearaxleDiscbrake
88040≤100Open100020003000400050006000700080001
RearaxleDrumbrake
78040≤80Open2000300040005000600070008000—1
6.4.3SPEED/PRESSURESENSITIVITY120km/h—8snubs120to80km/hatincreasingpressures.SeeTable7.
TABLE7—SPEED/PRESSURESENSITIVITY120km/hSECTION
Parameter
NumberofsnubspercycleBrakespeed(km/h)Releasespeed(km/h)Initialbraketemperature(°C)Finalbraketemperature(°C)Pressuresnub1(kPa)Pressuresnub2(kPa)Pressuresnub3(kPa)Pressuresnub4(kPa)Pressuresnub5(kPa)Pressuresnub6(kPa)Pressuresnub7(kPa)Pressuresnub8(kPa)Numberofcycles
Frontaxle
812080≤100Open100020003000400050006000700080001
RearaxleDiscbrake
812080≤100Open100020003000400050006000700080001
RearaxleDrumbrake
712080≤80Open2000300040005000600070008000—1
-6-
SAEJ2522IssuedJUN2003
6.4.4SPEED/PRESSURESENSITIVTY160km/h—8snubs160to130km/hatincreasingpressures.SeeTable8.
TABLE8—SPEED/PRESSURESENSITIVITY160km/hSECTION
Parameter
NumberofsnubspercycleBrakespeed(km/h)Releasespeed(km/h)Initialbraketemperature(°C)Finalbraketemperature(°C)Pressuresnub1(kPa)Pressuresnub2(kPa)Pressuresnub3(kPa)Pressuresnub4(kPa)Pressuresnub5(kPa)Pressuresnub6(kPa)Pressuresnub7(kPa)Pressuresnub8(kPa)Numberofcycles
Frontaxle
8160130≤100Open100020003000400050006000700080001
RearaxleDiscbrake
8160130≤100Open100020003000400050006000700080001
RearaxleDrumbrake
7160130≤80Open2000300040005000600070008000—1
6.4.5
SPEED/PRESSURESENSITIVITY200km/h—8snubs200to170km/hatincreasingpressures.Ifvehiclemaximumspeedbelow200km/husebrakespeedequaltovehicletopspeedandreleasespeedof30km/hbelowvehicletopspeed.SeeTable9.
TABLE9—SPEED/PRESSURESENSITIVITY200km/hSECTION
Parameter
NumberofsnubspercycleBrakespeed(km/h)Releasespeed(km/h)Initialbraketemperature(°C)Finalbraketemperature(°C)Pressuresnub1(kPa)Pressuresnub2(kPa)Pressuresnub3(kPa)Pressuresnub4(kPa)Pressuresnub5(kPa)Pressuresnub6(kPa)Pressuresnub7(kPa)Pressuresnub8(kPa)Numberofcycles
Frontaxle
8200170≤100Open100020003000400050006000700080001
RearaxleDiscbrake
8200170≤100Open100020003000400050006000700080001
RearaxleDrumbrake
7200170≤80Open2000300040005000600070008000—1
-7-
SAEJ2522IssuedJUN2003
6.5CharacteristicValue2—6snubs80to30km/hat3000kPa.SeeTable10.
TABLE10—CHARACTERISTICVALUE2SECTION
Parameter
NumberofstopspercycleBrakespeed(km/h)Releasespeed(km/h)Pressure(kPa)
Initialbraketemperature(°C)Finalbraketemperature(°C)Numberofcycles
Frontaxle
680303000≤100Open1
RearaxleDiscbrake
680303000≤100Open1
RearaxleDrumbrake
680303000≤80Open1
6.6ColdApplication—1stop40to5km/hat3000kPa.SeeTable11.
TABLE11—COLDAPPLICATIONSECTION
Parameter
NumberofstopspercycleBrakespeed(km/h)Releasespeed(km/h)Pressure(kPa)
Initialbraketemperature(°C)Finalbraketemperature(°C)Numberofcycles
Frontaxle
140≤53000≤40Open1
RearaxleDiscbrake
140≤53000≤40Open1
RearaxleDrumbrake
140≤53000≤40Open1
6.7MotorwayApplications—1stopand1snubat0.6g.SeeTable12.
TABLE12—MOTORWAYAPPLICATIONSSECTIONS
Parameter
NumberofstopspercycleBrakespeedforstop1(km/h)Brakespeedforsnub2(km/h)Releasespeedforstop1(km/h)Releasespeedforsnub2(km/h)Decelerationlevel(g)Initialbraketemperature(°C)Finalbraketemperature(°C)Numberofcycles
Frontaxle
210090%ofVmax
≤550%ofVmax
0.6≤50Open1
RearaxleDiscbrake
210090%ofVmax
≤550%ofVmax
0.6≤50Open1
RearaxleDrumbrake
210090%ofVmax
≤550%ofVmax
0.6≤50Open1
-8-
SAEJ2522IssuedJUN2003
6.8CharacteristicValue3—18snubs80to30km/hat3000kPa.SeeTable13.
TABLE13—CHARACTERISTICVALUE3SECTION
Parameter
NumberofstopspercycleBrakespeed(km/h)Releasespeed(km/h)Pressure(kPa)
Initialbraketemperature(°C)Finalbraketemperature(°C)Numberofcycles
Frontaxle
1880303000≤100Open1
RearaxleDiscbrake
1880303000≤100Open1
RearaxleDrumbrake
1880303000≤80Open1
6.9Fade1—15stops100to5km/hat0.4gandincreasinginitialtemperatures.SeeTable14.
TABLE14—FADE1SECTION
Parameter
NumberofstopspercycleBrakespeed(km/h)Releasespe
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