外文翻译--正齿行星轮分插机构椭圆齿轮的计算机辅助设计.doc

外文翻译毕业设计题目椭圆齿轮行星系大株距植苗机构的设计原文1正齿行星轮分插机构椭圆齿轮的计算机辅助设计译文1COMPUTERAIDEDDESIGNOFOVALGEAROFSEPARATINGPLANTINGMECHANISMWITHPLANETARYGEARSOFNONECCENTRICITY原文2钵苗移栽机椭圆齿轮行星系植苗机构运动学建模与分析译文2KINEMATICSMODELINGANDANALYSISOFTRANSPLANTINGMECHANISMWITHPLANETARYELLIPTICGEARSFORPOTSEEDLINGTRANSPLANTERCOMPUTERAIDEDDESIGNOFOVALGEAROFSEPARATINGPLANTINGMECHANISMWITHPLANETARYGEARSOFNONECCENTRICITYABSTRACTSEPARATINGPLANTINGMECHANISMWITHPLANETARYGEARSOFNONECCENTRICITYISANEWTYPEMECHANISM．THEMECHANISMISCONSTITUTEDBYTHREEPARTSTHEYAREOVALGEARTRANSMISSIONDIVISION，PLANETARYGEARTRANSMISSIONDIVISIONANDPLANTTHEARM．BASICTHOUGHTOFDESIGNINGISADOPTINGOVALGEARTRANSMISSION，CHOICETHEFITCONSTRUCTIONPARAMETERTOENSUREASYMMETRYTRANSMISSIONRATIOANDSCREWTHEANGLERELATIONOFTHEREQUESTOFTRANSPLANTRICESEEDLING．THETHESISWILLEXPATIATEHOWTOCOMPUTERGEOMETRICPAREMETEROFOVALGEAR，ANALYSISTRANSMISSIONCHARACTEROFOVALGEAR，ANDENSURETRANSMISSIONRATIOANDANGLEOFPRESSUREINTHEPERIODOFENGAGEMENTOFOVALGEARKEYWORDSAGRICULTURALENGINEERING；SEPARATINGPLANTINGMECHANISMWITHPLANETARYGEARSOFNONECCENTRICITY；DESIGN；OVALGEAR；COMPUTERAIDEDDESIGN1TRANSPLANTINGMECHANISMWITHPLANETARYGEARSWORKSASSHOWNINFIGURE1,THEDIAGRAMOFTHEPLANETARYGEARSRICETRANSPLANTERTRANSPLANTINGMECHANISMMAKEUPWITHFOURCONGRUENTTHEZHENGYUANGEARAND3CONGRUENTOVALGEAR3ROTATIONCENTEROFTHEOVALGEARAREINTHEFOCUSOFTHEOVALEAR,THEYHAVESAMEINITIALPHASETHECENTEROVALGEAR3ALSOCALLEDSUNWHEELFIXEDGEARBOXEQUIVALENTCARRIERISDRIVEDBYTHECENTRALAXIS,THEEQUIVALENTOFAPRIMEMOVERPIECESROTATEAROUNDTHEROTATIONCENTER0OFTHESUNWHEELSINCETHETWOOVALGEARS3AND4ENGAGESTHATCAUSEDTHECHANGEOFTHETRANSMISSIONRATIO,SOTHETWOPLANETSCIRCLEGEARTHATSYMMETRICALARRANGEMENTARESWINGINGBACKANDFORTH,SEEDLINGCLAWMOVEATTHEREQUIREDPOSTUREANGULARDISPLACEMENTANDTRAJECTORYTHEBASICIDEAOFTHEDESIGNISUSETHENONUNIFORMDRIVEOFOVALGEARPAIRANDSELECTTHEAPPROPRIATESTRUCTURALPARAMETERSTOFINDTHEWORKTRAJECTORY,THETAKESEEDLINGSANGLEANDTHEPLANTINGANGLETHATMEETPLANTINGREQUIREMENTS1PLANETARYCIRCULARGEAR2INTERMEDIATECIRCULARGEAR3CENTRALOVALGEAR4INTERMEDIATEOVALGEAR5SEEDLINGNEEDLEFIGURE1ASCHEMATICDIAGRAMOFPLANETARYGEARSTRANSPLANTINGMECHANISM2OVALGEARROTATIONRELATIONSHIPFIGURES2AND3ASAPAIROFCONGRUENTOVALGEARMESHINGRELATIONSHIPDIAGRAMFIGURE2ISTHEINITIALPOSITIONOFTHEELLIPTICALGEARDRIVECAPSTANDOUNIFORMMOTION,WHENTHEONEPAIROFCONGRUENTOVALGEAR,THEROTATIONALSPEEDOFTHEWHEELFROMMOVINGPERIODICALLYCHANGESTHUS,THEGEOMETRICCHARACTERISTICSOFTHEOVALGEARONLYWITHECCENTRICITYANDFIXEDAXISROTATIONRELATIONSHIPOFTHEGEARTRAINANDAPAIROFLARGERECCENTRICITYTHEOVALGEARVICECORNERRELATIONSAREQUITETHEREFORE,APPROPRIATELYCHANGINGTHEECCENTRICITYOFTHEELLIPTICALGEARSCANMEETTHEREQUIREMENTSOFTRANSPLANTINGANGULARRELATIONSHIPELLIPTICALGEARDRIVETRANSMISSIONNATUREHASLAIDATHEORETICALFOUNDATIONFORTHISARTICLETRANSPLANTINGMECHANISMOVALGEARDESIGNOFPLANETARYGEARSFIGURE2STARTINGPOSITIONFIGURE3ROTATEDPOSITION3OVALGEARDESIGN31OVALGEARPITCHCURVEARCLENGTHCALCULATIONTHEORIGINOFTHEPOLARCOORDINATEISTAKENATTHEOVALLOWERFOCUS0,TOTHEGEOMETRICCENTEROFTHEELLIPSEO,ASTHECOORDINATEORIGINFORACARTESIANCOORDINATESYSTEMOXYAXISINTHEMINORAXISDIRECTION,YAXISINTHELONGAXISTHATOCENTER,THEMAJORAXISOFTHEELLIPSERADIUSFORTWOCIRCLESRADIUSAANDMINORRADIUSBFIGURE4SHOWSTHETODIAMETEROIANDTHEXAXISISY,ITISTHEINTERSECTIONOFTHESETWOCIRCLES,RESPECTIVELYBYI,IANDJFORTHELINEPARALLELTOTHEXAXIS,ASALINEPARALLELTOTHEYAXISBYJTHETWOLINESINTERSECTATMX,YBASEDONTHEELLIPTICALNATUREOFTHEPOINTMISAPOINTONTHEELLIPSETERMSOFYANGLEVARIATIONOFPARAMETERS,THEPARAMETRICEQUATIONOFTHEELLIPSEFIGURE4OVALGEARPITCHCURVEARCLENGTH