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1、MidGearBendingFatigueDesignMethodbasedonRainflowPrincipleWangGuo-jun1,aZhuShi-shun2,bChenXin3,c1.DepartmentofAutomobileEngineering,AcademyofMilitaryTransportation,Tianjin300161,Chinaa.wguojun@yeah.netb.zhushishun@yahoo.comc.cxjmh@163.comKeyWords:midgear;bendingfatigue;rainflowA
2、bstract.Thegrowingrequirementsoflightconstructionsarepushingtheneedsformoredetaileddurabilityanalysisanddesignfortransmission.Themethodologydescribedinthispapertacklesoneofthekeyproblem,midgearbendingfatiguedesign.Generally,gearbendingfatiguedesignwasbasedonthetorquetransmitted
3、bythegearandtherevolutionofit.Formidgear,onlyonecoefficientwasconcernedcomparedwiththegearwhichwasloadedonthesinglesideoftheteeth.Themodificationwasnotrelatedwiththestress-strainrelationshipofthegeartoothroot.Inordertosolvetheproblem,defectsofthetraditionaldesignmethodwaspointe
4、dout.Forgearswithsinglesideloaded,themeanstresswasequaltotheamplitude,whichwassametothegearbendingfatiguepropertytest.Butthecharacteristicofloadcycleformidgearwasdifferent.Formidgear,meanstressontherootofteethwaszero.Ontheviewofmetalfatigue,repeatedplasticdeformationwasthereaso
5、nofgearteethfatiguefracture.Rainflowcountingmethodwasinaccordancewithrelationshipofthestress-strainrelationshipbasedonmetalfatigue.Basedonrainflowprinciple,anewmethodologywithmodificationofmeanstresswasgivenformidgeardesign.IntrodcutionBendingfatiguewasoneofthemainfaluremodeofg
6、ears.Themethodofgearfatiguedesignwasdiscussedinmanypapers.MostofthemwerebasedonGB/T3480-83.Butthestudyshowsthatthemethodonlyfitsforthesinglesideloadedgear.Doublesidesloadedgearswerewidelyusedinvehicle,engineeringmachineandcommonspeedreductionmachines.Tosolvethefatiguedesignatio
7、nproblemofmidgear,themeanstressmodificationmethodwasgivenwhichwasbasedonrainflowprincpleandfatiguedemagetheory.Itisanadditiontothetraditionaloriginalmethod.TraditonalMethodsReference[1][2]pointedoutthatwhentheloadspectrumofgeartransmissionsystemwasknown,theequivalenttorquewasgo
8、tasfollows.Thegearabilitytoresistfatiguedemagewasshown
