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1、车辆与动力工程学院毕业设计说明书PowertakeoffshaftThepowertakeoffshaftusuallycalledsimplythepowertakeoff,providesameanstodrivethemachinethatarebeingtowedbythetractor.theenginepowerofthetractorisbeingusednotonlytopullorcarrythemachine,butalsotooperateit.typicalexampledo
2、fmachinesthatarepowerdrivenaremowers.,balers,combine.potatoharvests,andmanurespreader.thePTOprovidesaveryusefulsourceofpower.andthealternativewouldbetofitanenginetoeachofthesemachine.thisis,ofcoursedonewherethepowerrequiredtodrivethemachinemaybegreater
3、thanthetractorcanbesupply.Generallymostmachinescanbepoweredbythetractor.Powertakeoffshaftarecalssifilyaccordingtotheirlocationofthetractor,typeofthedrive.rotationspeed,andmethodofcontrol.MosttractorareequippedwitharearPTO.someofthemhaveafrontPTO,ROW-tr
4、actorusebotharearandasidePTO.AStothetypeofdrive,powertakeoffshaftareclassedastransmissiondrive.live,semi-independent,andground-speedtype,thetransmissiondrivePTOISdrivenfromthetractortransmissionandsoitwillstoprotatingwhenevertheengineclutchisdisengage.
5、ThelivePTOisdrivenfromtheenginecrankshaftthroughtheclutchdrivingmemberirrespectiveofthepositionoftheclutch.thesemi-independentPTOWILLcontinuetooperatewhilethedriverisshiftinggears,butisincapableofbeingengagedordisengagedwhilethetractorismoving.thegroun
6、d-speedPTOhasitsspeedproportionaltothegroundspeedofthetractor.suchAPTOfindsapplicationonrow-croptractorstooperatemachine.suchasmounteddrills.whoseworkingratemustbeinsynchronismwiththegroundspeedofthetractor.13车辆与动力工程学院毕业设计说明书Thepowertakeoffarestandardi
7、zedat540and1000rpm(ATnominalenginespeed)thespinedendsofPTOshaftofalltractorareofoneandsamesizeandarearrangedatoneandthesamelevelrelativetothetractorsupportsurface.whenthePTOShaftisnotused,itsendiscoveredbyaguardstampedfromsheetsteel.Powertakeoffshaftma
8、ybecontrolbyeithermechanicalorhydraulicmeansLivePTOshaftcanbeengageordisengageontherunbyhydraulicorcomplexmechanicalmeans.WhenthePTOisdisengage,sungearbrakeisreleasedandplanetcarrierisapplied.Inthiscase,PTOshaftisheldstationaryandthepla
