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1、ARTICLEINPRESSMechanismandMachineTheoryMechanismandMachineTheoryxxx(2007)xxx–xxxwww.elsevier.com/locate/mechmtOptimizationofasymmetricspurgeardrivestoimprovethebendingloadcapacityV.SenthilKumar,D.V.Muni,G.Muthuveerappan*IndianInstituteofTechnologyMadras,DepartmentofMech
2、anicalEngineering,Chennai,Tamilnadu600036,IndiaReceived10October2006;receivedinrevisedform30May2007;accepted27June2007AbstractInagivensizeofsymmetricinvolutegeardesignedthroughconventionalapproach,astheloadcarryingcapacityisrestrictedatthehigherpressureangleduetotipping
3、formation,theuseoftheasymmetrictoothedgeartoimprovethe?lletcapacityinbendingisexaminedinthisstudy.Non-standardasymmetricrackcutterswithrequiredpressureanglesandmodulearedevelopedtogeneratetherequiredpinionandgearofadrivewithasymmetricinvolutesurfacesandtro-choidal?lletp
4、ro?les.Therespectivepro?lesthusgeneratedareoptimizedforbalanced?lletstressesthatareequalandpossiblythelowestalso.Forthisstudyofoptimization,severalnon-standardasymmetricrackcuttersaredesignedtoaccommodatedi?erentcombinationsinthevaluesofpressureangle,toplandthicknessrat
5、io,pro?leshift,speedratioandtheasymmetricfactors.Howeverforanydrivewithagivencenterdistanceandaspeedratio,onlytwonon-standardasymmetricrackcutters,oneforthepinionandotherforthegearareusedtogeneratearequirednumbersofpinionandgearwithdi?erentcuttershiftvaluesforthepurpose
6、ofoptimization.Thein?uenceoftheseparametersonthemaximum?lletstresshasbeenanalyzedtosuggesttheoptimumvaluesoftheseparametersthatimprovethe?lletcapacityinbending.Theoptimizationoftheasymmetricspurgeardriveiscarriedoutusinganiterativeprocedureonthecalculatedmaximum?lletstr
7、essesthroughFEMfordi?erentrackcuttershiftsand?nallytheoptimumvaluesofrackcuttershiftsaresuggestedforthegivencenterdistanceandthespeedratioofanasymmetricgeardrive.Comparisonshavealsobeenmadesuccess-fullywiththeresultsoftheAGMAandtheISOcodesforsymmetricgearstojustifythere
8、sultsofthe?niteelementmethodpertainingtothisstudy.ó2007ElsevierLtd.Allrightsreserved.Keywords:Optimumdrive;Non
