GearreducerbasedonUG3dentitymodelandmovementsimulationAbstract:thispaperintroducesthefinalversionwithUGsoftwareUGNXMOSLINGmodulegearreducerforthethree-dimensionalentitymodel,themainpartsincludingshaft,gear,gear,shaft,thelowerhousing,onhousingandassembly.FinallyintheMOTIONmoduleofUGassemblymodelfortheMOTIONsimulation.Keywords:UG；Threedimensionalentitymodeling；Gearreducer；ThesimulationChineseclassificationnumber:TH16literatureidentifier:AUGisathree-dimensionalentitymodelintheintegrationofCAD/CAM/CAEtechnologyandiswidelyusedincomputeraideddesign,analysis,manufacturingsoftware.Inthisarticle,thereareafewproblemsthatshouldbepaidattentiontois:theinvolutegeartoothprofilemodel,whenoperatinghollow-outstylecover,gearpositionbetweentheshaftandgearassembly.1drawinginvolutetoothprofileofthegearOntheotherhandgearinvolutetoothprofilegearinUG(3)theexpressioninthedrawing,theinvolutegearteethwithvc+6.0configurationfilearticlessavedcoordinateschemeandthecorrespondingdatafiletoothprofilefacevalue,anddefinesplinedrawinginvolutetoothprofilegearusedotreadfromthefile.InvolutepolarparameterequationisWillrkandtheexpansionofthesubstitutionandtheexpressionoftrigonometricfunctions,canbeobtained:HereisintheKpointofinvolutetoothprofileradius,AngleisinvoluteinAK,isradiusofbasecircle,isattheKpointofpressureAngle.Figure1,figure2Withvc+6.0programtochangefrom0to180K(K+),youcangetcorrespondingXkandYk,andsavethecorrespondingdatafileJKX.Dat,asshowninfigure1.InUGwithinsert-curve-simulationinthemainmenu,clickthebybuttonwillpopupdialogbox,andthenthesystemdisplaysasshowninfigure2areconnectedbyaspline.ClickthetakefromthefilebuttonandselecttheaforementioneddatafileJKX.Dat,cangetthecorrespondinginvoluteasshowninfigure3.Figure3DuetotooththicknessandreferencecircletoothspacewidthisequaltothegeartoothandtoothspaceisquiterelativecentralAngle,thentheoppositehalftooththicknessiscentralAngle,thatis,zrepresentsthenumberofteeth,shouldbeXCshaftrotationandthroughtheexpressionofcalculate,AngleisduetothereferencestandardgearpressureAnglefor,shouldbeXCshaftrotation.OntheXCshaftdrawingastraightline,andthenselectthelineasthecenterlineofthemirror,cableonlinemirrortomirrorinvolute,thetoothprofilesurfaceandtheradiusofaddendumAngleis,masthemodulus,isthenominalpressureAngle,isthecoefficientoftoothbottom.Finally,youcangetthegearasshowninfigure4,thethree-dimensionalentitymodel.Figure4Similarly,youcangetthegearinvolutegearshaftcontour.2whenthecoverismodelingsomeproblemsdeserveattentionHollowcaptocovertheentiremodel,completedthereceivepartoftheentity,cantfullyperfectentity.Inthisarticle,weusehollowingoutintheareaandthecoveragecanbedividedintotwoparts:thebearingseat,andraisedlevelsandboardingandcanjointogetherisapartofthem；Therestisanotherpart,andthehollow.Thekeypointistojoinbeforehollowingout,andmustbeafterthehollowingout.Webelievethatthecomplexsystemshouldbebrokendownintosimple,andhollowedoutrespectively,andthenjoin.3thepositionofthegearshaftandgearassemblyBetweengearsandgearshaftaxialpositionwhenintheassemblyistodetermine,sotheinterferencemayoccurbetweentheteeth.InUG,thereareeighttypesofrestrictions,suchas:gear,alignment,Angle,parallel,perpendicular,center,distanceandtangent,buttheyarenot