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1、毕业设计中英文翻译学牛姓名:学院:专业:机械设计制造及其自动化指导教师:年月PlanetaryGearsIntroductionTheTamiyaplanetarygearboxisdrivenbyasmallDCmotorthatrunsatabout10,500rpmon3.0VDCanddrawsabout1.0A.Themaximumspeedratiois1:400,givinganoutputspeedofabout26rpm.Fourplanetarystagesaresuppliedwiththegearbox,two1:4andtwo1:5,andanycombinatio
2、ncanbeselected.Notonlyisthisagooddriveforsmallmechanicalapplications,itprovidesanexcellentreviewofepicyclegeartrains.Thegearboxisaverywell-designedplastickitthatcanbeassembledinaboutanhourwithveryfewtools.ThesourceforthekitisgivenintheReferences.Let'sbeginbyreviewingthefundamentalsofgearing,andthet
3、rickofanalyzingepicyclicgeartrains.EpicyclicGearTrainsApairofspurgearsisrepresentedinthediagrambytheirpitchcircles,whicharetangentatthepitchpointP・Themeshinggearteethextendbeyondthepitchcirclebytheaddendum,andthespacesbetweenthemhaveadepthbeneaththepitchcirclebythededendum.Iftheradiiofthepitchcircl
4、esareaandb,thedistancebetweenthegearshaftsisa+b.Intheactionofthegears,thepitchcirclesrollononeanotherwithoutslipping.Toensurethis,thegearteethmusthaveapropershapesothatwhenthedrivinggearmovesuniformly,sodoesthedrivengear・Thismeansthatthelineofpressure,normaltothetoothprofilesincontact,passesthrough
5、thepitchpoint.Then,thetransmissionofpowerwillbefreeofvibrationandhighspeedsarepossible・Wewon'ttalkfurtheraboutgearteethhere,havingstatedthisfundamentalprincipleofgearing.IfagearofpitchradiusahasNteeth,thenthedistancebetweencorrespondingpointsonsuccessiveteethwillbe2兀a/N,aquantitycalledthecircularpi
6、tch.Iftwogearsaretomate,thecircularpitchesmustbethesame・Thepitchisusuallystatedastheration2a/N,calledthediametralpitch・Ifyoucountthenumberofteethonagear,thenthepitchdiameteristhenumberofteethtimesthediametralpitch.Ifyouknowthepitchdiametersoftwogears,thenyoucanspecifythedistancebetweentheshafts.The
7、velocityratiorofapairofgearsistheratiooftheangularvelocityofthedrivengeartotheangularvelocityofthedrivinggear.Bytheconditionofrollingofpitchcircles,r=-a/b=-N
8、/N2,sincepitchradiiareproportionaltothenumberoft
