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字翻译.docx

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字翻译

DesignandAnalysisoftheGeminiChainSysteminDualClutchTransmissionofAutomobile

Abstract

Chaindrivesystemiswidelyusedintheconditionsofhigh-speed,overload,variablespeedandload.Manystudiesarefocusedonthemeshingtheoryandwearcharacteristicsofchaindrivesystem,butsystemdesign,analysis,andnoisecharacteristicsofthechaindrivesystemareweak.SystemdesignandnoisecharacteristicarestudiedforanewtypeGeminichainofdual-clutchautomatictransmission.Basedonthemeshingtheoryofsilentchain,thedesignparametersoftheGeminichainsystemarecalculatedandthemathematicalmodelsanddynamicanalysismodelsoftheGeminichainsystemareestablished.DynamiccharacteristicsoftheGeminichainsystemissimulatedandthecontactforceofplateandpin,plateandsprockets,thechaintensionforces,thetransmissionerrorandthestressofplatesandpinsareanalyzed.AccordingtothesimulationresultsoftheGeminichainsystem,thenoiseexperimentaboutsystemiscarriedout.Thenoisevaluesaretestedatdifferentspeedandloadandspectralcharacteristicsareanalyzed.Theresultsofsimulationandexperimentalshowthatthecontactforcesofplateandpin,plateandsprocketsaresmallerthantheallowablestressvalues,thechaintensionforceislessthanultimatetensionandtransmissionerrorislimitedin%.Thenoisevaluescanmeettherequirementsofindustrialdesign,anditisprovedthatthedesignandanalysismethodoftheGeminichainsystemisscientificandfeasible.ThedesignandtestsystemisbuiltfromanalysistotestofGeminichainsystem.Thisresearchpresentedwillprovideacorrespondingtheoreticalguidanceforthedesignanddynamiccharacteristicsandnoisecharacteristicsofchaindrivesystem.

Keywords:

Geminichain,systemdesign,noisecharacteristic,dynamiccharacteristic,transmissionerror.

1Introduction

Transmissionsystemisthecorecomponentoftheautomotivepowertrain.Itsexcellentperformanceandperfection,playdecisiverolesintheautomobilepowerperformance,economy,comfortableandreliability.Dualclutchtransmission（DCT）cantransmitpowerwithoutinterruption.Thustheshifttimeisshortenedandtheshiftqualityiseffectivelyimproved.DCThasinheritedmanyadvantagesofthemanualtransmission,suchashightransmissionefficiency,compactinstallationspace,lightweight,lowcostetc.Soitisthedevelopmentdirectionintheautomatictransmissionindustry.

DCTavailableinautomotivetechnologyisshowninFig.

1.Theroundpinsilentchaintransmissionsystemisappliedinthechaintransmissionsystemstudiedinthispaper.

Uptonow,manyscholarshavedonealotofresearchinrelatedareas.Basedonthemeshingtheoryofsilentchainandsprocket,MENGFanzhong,etal[1–4],presentedamethodwhichcancalculatetheparametersofplateandsprocket.Themeshingdesignsystemofchainplate-sprocket-hobwhenplateandsprocketismeshingwasstudiedinthosepapers.Andthemultivariatevariationcharacteristicofsilentchainplateandsprocketisexpounded.Basedonthesilentchainsimulationmodels,FENGZengming,etal[5–6],researchedthemeshingcharacteristicofchaindrivesystembyanalyzingthecontactforceandstressofplateandpinindifferentmeshingperiod.Basedontheabrasiontestofchaindrivesystem,CHENGYabing,etal[7–9],studiedtheabrasionpositionsurfacemorphologyofplate,sprocketandpin.Thetransversefluctuationsofaxialmovingofsilentchainusingmulti-bodydynamicswereanalyzedbyZHANGWM,etal[10].ThewearcharacteristicsofautomotivechaindrivesystemfromthemicroscopicviewandanalyzedtheforcecharacteristicsofchainplateandpinattheNano-levelwasstudiedbyLIBaolin,etal[11].MicrostructureandperformanceofcontactsurfacesofthetoothchainplateafterquenchinginthemicroscopewasresearchedbyFUZhenming,etal[12].DynamicresponseofthechaintransmissionsystemincompositeandalternatingconditionswasstudiedbyXULixin,etal[13].BasedonthemeshingmechanismofchainplateandsprocketwithinvolutetoothproposedbyXUEYunna,etal[14–15],WANGYong,etal[16],analyzedthemodificationcoefficientofsprocketwhilethechainplateandsprocketmeshing.Theyhaveachievedthechangerulesofdifferenttoothprofilefromthemodificationcoefficientchanges.Newdoublepitchrocker-pinsilentchainforconveyorsandsprockettoothprofilewerestudiedbyWANGWencheng,etal[17],SUNWei,etal[18],theyproposedanewtypeofdoublepitchrocker-pinsilentconveyorchainandstudiedsprockettoothprofileandinvolutesprockettoothprofileforeffectsondynamictensionofchainsinthesilentchaindrive.

Fig.1.SchematicofDCTtransmissionsystem

Manyotherfamousscholarshaveconductedin-depthresearchinthechaintransmissionrelatedfields.PERAIRACM,etal[19],presentedamethodtoestablishmulti-bodydynamicsmodelofachaindrivesystemwithgeometricmathematics,andanalyzedthelinkvelocity,acceleration,forceandtrajectory.YOUNGJD,etal[20],proposedanarrangementofanon-symmetricandalternatingengagementtoothprofile,andamethodforinstallingthedampingrubberringintheoutsidesprockettoreducemeshingimpactandvibrationofrollerchaindrivesystem.FUJIMOTON,etal[21],developedamethodtoachievechainnoisereductionbychangingmeshingtoothprofileoftheplateandthechainsprocket.MATSUDAal[22]presentedanewsilentchainanddevelopedasilentchainwithdouble-sidedengagement,whichcanachievemultiaxisdriveinspace.BasedonbyTROEDSSONI,etal[23],presentedamathematicalmodel,anddevelopedamathematicalmodel.Bythismodel,oscillationandforceofthechaintransmissionsystemcanbecalculateddirectly.ThechoralactionandtransmissionerrorsofasimplesilentchainsystemwasinvestigatedbyHUANGC,etal[24],theyanalyzedthechoralactionbasedonthetoothcontactanalysisofthechainwiththedrivingsprocket.

DCTtransmissionsystemstudiedinthispaperisanewtypeGeminichainsystemofDCTbasedonanimprovedDCTchaintransmissionsystem.Basedonthemeshingtheoryofsilentchain,anewGeminichaintransmissionsystemisdesignedandthedynamicanalysismodelisestablished.BasedonRecurDynsoftware,thedynamiccharacteristicsareanalyzedandevaluated.ThenoisecharacteristicsoftheGeminichaintransmissionsystemareanalyzedthroughnoiseexperimental.Theinnovationofthispaperisthefirsttimecombinedthedesign,simulationanalysisandnoiseexperimentalwhichcanimprovethedesignandsimulation.Wecanverificationtherationalofdesignthroughsimulationanalysisandexperimental.

2MathematicModelingEstablished

Parametersdesignofplate

AccordingtothemeshingtheoryofsilentchainandsprocketandthedesignconditionsofGeminichainsystemindualclutchtransmission,theplatedesignoftheDCTGeminichaintransmissionsystemisshowninFig.2.Themainparametersare:

holepitcha,apothemf,halfangleoftoothprofileα.

Fig.2.Plateparameter

Theholepitcha=mm,apothemf=mm,thehalfangleoftoothprofileα=30°.

Parametersdesignofsprocket

ThesprocketdesignoftheDCTGeminichaintransmissionsystemisshowninFig.3.Themainparametersare:

teethnumberZ,pitchp,pitchdiameterd,tipdiameterdaandrootdiameterdf,measurementoverpinsMR,measuringpindiameterdR.TheGeminichainsystemconsistsofcrankshaftsprocket（Geminisprocket）,clutchsprocket1，clutchsprocket2，chain1andchain2.ThedesignparametersofsprocketsareshowninTable1.

Fig.3.Sprocketparameter

Parametersdefinition

（1）Accordingtothedesignrequirements,thespeedrangeofGeminisprocketisdefinedfrom0to6500r/min.

（2）ThenumberofwholechainlinksmustbecalculatedintheprocessofdesignandcalculationofDCTGeminichainsystem.Bycalculation,thenumberofchainlinksbetweenGeminisprocketandclutchsprocket1（chain1）is70,thenumberofchainlinksbetweenGeminisprocketandclutchsprocket2（chain2）is88.

（3）Relativecoordinatecentersofthethreesprocketsare:

theGeminisprocket（0,0,0）,clutchsprocket1,,

0）,theclutchsprocket2,,0）。

（4）Accordingtoabovecalculation,thelengthofthe

chain1isL1=m.Thelengthofchain2isL2=

m[22–23]。

3SystemDynamicCharacteristicsAnalysis

Systemdynamicmodel

AccordingtotheaboveparameterscalculationofGeminiplateandsprockets,thethree-dimensional（3D）modelwasestablishedinCATIAasbelow.Theplate3DmodelisshowninFig.4（a）withplatematerial50CrVA.Thepindiameterismmwithpinmaterial20CrMnMo.The3DmodelofGeminisprocketisshowninFig.4（b）.Itsteethnumberis24andtheworkingtoothprofileisinvolutewithsprocketmaterial40Cr.The3Dmodelofclutchsprocket2isshowninFig.4（c）.Thetoothnumberis42andtheworkingtoothprofileisinvolutewithsprocketmaterial40Cr.The3Dmodelofclutchsprocket1isshowninFig.4（d）.Thetoothnumberis56andtheworkingtoothprofileisinvolutewithsprocketmaterial40Cr.ThematerialpropertiesareshowninTable2.

Systemdynamiccharacteristics

Accordingtothestructureandlayoutofthedualclutch,theGeminichaintransmissionsystemshowedinFig.5issimulated.Theforceandtorquehavebeentransferredthroughtwodifferentchains.ThedrivingsprocketisGeminisprocketwhichphasedifferenceishalfofthetoothprofileangle.Themeshingnoiseandvibrationcanbereducedeffectivelythroughadjustingrhythmandfrequency.

Fig.4.3Dmodelofchainplateandsprockets

Fig.5.Geminichainsystem

Contactforceofpinandplate

Thecontactforceofthepinandtheplateinmeshi