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1、毕业设计中英文翻译学生姓名：学号：学院：机械设计制造及其自动化专业：指导教师：年月PlanetaryGearsIntroductionTheTamiyaplanetarygearboxisdrivenbyasmallDCmotorthatrunsatabout10,500rpmon3.0VDCanddrawsabout1.0A.Themaximumspeedratiois1:400,givinganoutputspeedofabout26rpm.Fourplanetarystagesaresuppliedwiththegearbox,two1:4andtwo1:
2、5,andanycombinationcanbeselected.Notonlyisthisagooddriveforsmallmechanicalapplications,itprovidesanexcellentreviewofepicyclegeartrains.Thegearboxisaverywell-designedplastickitthatcanbeassembledinaboutanhourwithveryfewtools.ThesourceforthekitisgivenintheReferences.Let'sbeginbyreviewin
3、gthefundamentalsofgearing,andthetrickofanalyzingepicyclicgeartrains.EpicyclicGearTrainsApairofspurgearsisrepresentedinthediagrambytheirpitchcircles,whicharetangentatthepitchpointP.Themeshinggearteethextendbeyondthepitchcirclebytheaddendum,andthespacesbetweenthemhaveadepthbeneaththepi
4、tchcirclebythededendum.Iftheradiiofthepitchcirclesareaandb,thedistancebetweenthegearshaftsisa+b.Intheactionofthegears,thepitchcirclesrollononeanotherwithoutslipping.Toensurethis,thegearteethmusthaveapropershapesothatwhenthedrivinggearmovesuniformly,sodoesthedrivengear.Thismeansthatth
5、elineofpressure,normaltothetoothprofilesincontact,passesthroughthepitchpoint.Then,thetransmissionofpowerwillbefreeofvibrationandhighspeedsarepossible.Wewon'ttalkfurtheraboutgearteethhere,havingstatedthisfundamentalprincipleofgearing.IfagearofpitchradiusahasNteeth,thenthedistancebetwe
6、encorrespondingpointsonsuccessiveteethwillbe2πa/N,aquantitycalledthecircularpitch.Iftwogearsaretomate,thecircularpitchesmustbethesame.Thepitchisusuallystatedastheration2a/N,calledthediametralpitch.Ifyoucountthenumberofteethonagear,thenthepitchdiameteristhenumberofteethtimesthediametr
7、alpitch.Ifyouknowthepitchdiametersoftwogears,thenyoucanspecifythedistancebetweentheshafts.Thevelocityratiorofapairofgearsistheratiooftheangularvelocityofthedrivengeartotheangularvelocityofthedrivinggear.Bytheconditionofrollingofpitchcircles,r=-a/b=-N1/N2,sincepitchradiiareproportiona
8、ltothenumber
