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1、MechanismandMachineTheory36:2001)1105±1120www.elsevier.com/locate/mechmtDesignofnewtoothpro®lesforhigh-loadcapacitygearsThomasYeh,DanielC.H.Yang*,Shih-HsiTongMechanicalandAerospaceEngineeringDepartment,SchoolofEngineeringandAppliedScience,UniversityofCaliforniaatLos
2、Angeles,420WestwoodPlaza,LosAngeles,CA90095-1597,USAReceived29June2000;accepted6June2001AbstractAnewmethodforthedesignofline-contactgearpro®lesisintroducedinthispaper.Inthismethod,thedeviationfunctiontechniquewillbeappliedtogeneratethenewgearpro®les.Non-UniformRatio
3、nalB-Splineswillbeimplementedasthedeviationfunctions.Comparedtocurrentline-contactgearsofinvolutepro®les,someofthesenewpro®lescouldachievegreateraveragepro®leconformity,whichresultsinde-creasedcontactstresses,andcouldalsoachievedecreasedbendingstresses.Sincethesegea
4、rsarecapableofcarryinghigherloadsthangearsofequivalentsizes,thereshouldbecostsavingsandreducedmachinesizesincertainspecialapplicationsÓ2001ElsevierScienceLtd.Allrightsreserved.1.IntroductionGearsarefoundinalltypesofmachineryandareusedtotransmitpowerfromoneaxistoanot
5、her[1±3].Inmanyindustries,themachinery,andthusthegears,aresubjectedtoveryhighloads.Therearelimitationsontheloadcapacityofcurrentgearpro®les,thereforethesearchforsomenewgearpro®lesthatarecapableofsustaininghigherloadsisimportant.Theapplicationofthesetypesofgearscould
6、resultinsmallerandlessexpensivemachinery.Currentlytherearethreetypesoftoothpro®lesthatareusedingeardesign:theinvolute,cycloidal,andcirculararc:orNovikov)[4±6].Themostcommonlyusedpro®leistheinvolute,whichhastheadvantagesofline-contactmeshing,constantpressureangle,ins
7、ensitivitytocenterdistancevariation,andsimplicity.However,theinvolutepro®lesuersfromrelativelypoorlu-brication,lowerloadcapacity,andispronetointerference[2].Thecycloidalpro®lehasagoodoveralleciency,lessinterference,andalowerpressureangle,butitalsohaslowloadcapacityd
8、uetoitshighcontactstressandisverysensitivetoerrorsinmanufacturing[2].Forcertain*Correspondingauthor.Tel.:+310-206-8066;fax:+310-206-4830.E
