机械毕业设计英文外文翻译585主减速器和差速器.docx
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机械毕业设计英文外文翻译585主减速器和差速器.docx
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机械毕业设计英文外文翻译585主减速器和差速器
附录A英文文献
Finaldrive\Differential
Allvehicleshavesometypeofdriveaxle/differentialassemblyincorporatedintothedriveline.Whetheritisfront,rearorfourwheeldrive,differentialsarenecessaryforthesmoothapplicationofenginepowertotheroad.
Powerflow
Thedriveaxlemusttransmitpowerthrougha90°angle.Theflowofpowerinconventionalfrontengine/rearwheeldrivevehiclesmovesfromtheenginetothedriveaxleinapproximatelyastraightline.However,atthedriveaxle,thepowermustbeturnedatrightangles(fromthelineofthedriveshaft)anddirectedtothedrivewheels.
Thisisaccomplishedbyapiniondrivegear,whichturnsacircularringgear.Theringgearisattachedtoadifferentialhousing,containingasetofsmallergearsthataresplinedtotheinnerendofeachaxleshaft.Asthehousingisrotated,theinternaldifferentialgearsturntheaxleshafts,whicharealsoattachedtothedrivewheels.
Fig1Driveaxle
Rear-wheeldrive
Rear-wheel-drivevehiclesaremostlytrucks,verylargesedansandmanysportscarandcoupemodels.Thetypicalrearwheeldrivevehicleusesafrontmountedengineandtransmissionassemblieswithadriveshaftcouplingthetransmissiontothereardriveaxle.Driveinthroughthelayoutofthebridge,thebridgedriveshaftarrangedverticallyinthesameverticalplane,andnotthedriveaxleshaft,respectively,intheirownsub-actuatorwithadirectconnection,buttheactuatorislocatedatthefrontorthebackoftheadjacentshaft
ofthetwobridgesisarrangedinseries.Vehiclebeforeandafterthetwoendsofthedrivingforceofthedriveaxle,isthesub-actuatorandthetransmissionthroughthemiddleofthebridge.Theadvantageisnotonlyareductionofthenumberofdriveshaft,andraisethedrivingaxleofthecommonpartsofeachother,andtosimplifythestructure,reducesthevolumeandquality.
Fig2Rear-wheel-driveaxle
Somevehiclesdonotfollowthistypicalexample.SuchastheolderPorscheorVolkswagenvehicleswhichwererearengine,reardrive.Thesevehiclesusearearmountedtransaxlewithhalfshaftsconnectedtothedrivewheels.Also,somevehicleswereproducedwithafrontengine,reartransaxlesetupwithadriveshaftconnectingtheenginetothetransaxle,andhalfshaftslinkingthetransaxletothedrivewheels.
Differentialoperation
Inordertoremovethewheelaroundinthekinematicsduetothelackofco-ordinationaboutthewheeldiameterarisingfromadifferentorthesamerollingradiusofwheeltravelrequired,inter-wheelmotorvehiclesareequippedwithaboutdifferential,thelattertoensurethatthecardriverBridgeonbothsidesofthewheelwheninrangewithatriptothecharacteristicsofrotatingatdifferentspeedstomeettherequirementsofthevehiclekinematics.
Fig3Principleofdifferential
Theaccompanyingillustrationhasbeenprovidedtohelpunderstandhowthisoccurs.
1.Thedrivepinion,whichisturnedbythedriveshaft,turnstheringgear.
2.Theringgear,whichisattachedtothedifferentialcase,turnsthecase.
3.Thepinionshaft,locatedinaboreinthedifferentialcase,isatrightanglestotheaxleshaftsandturnswiththecase.
4.Thedifferentialpinion(drive)gearsaremountedonthepinionshaftandrotatewiththeshaft.
5.Differentialsidegears(drivengears)aremeshedwiththepiniongearsandturnwiththedifferentialhousingandringgearasaunit.
6.Thesidegearsaresplinedtotheinnerendsoftheaxleshaftsandrotatetheshaftsasthehousingturns.
7.Whenbothwheelshaveequaltraction,thepiniongearsdonotrotateonthepinionshaft,sincetheinputforceofthepiniongearsisdividedequallybetweenthetwosidegears.
8.Whenitisnecessarytoturnacorner,thedifferentialgearingbecomeseffectiveandallowstheaxleshaftstorotateatdifferentspeeds.
Open-wheeldifferentialoneachgeneralusethesameamountoftorque.Todeterminethesizeofthewheeltorquetobeartwofactors:
equipmentandfriction.Indryconditions,whenalotoffriction,thewheelbearingtorquebyenginesizeandgearrestrictionsarehoursinthefriction(suchasdrivingonice),isrestrictedtoamaximumtorque,sothatvehicleswillnotspinround.Soevenifthecarcanproducemoretorque,butalsoneedtohavesufficienttractiontotransfertorquetotheground.Ifyouincreasethethrottleafterthewheelsslip,itwillonlymakethewheelsspinfaster.
Fig4Conventionaldifferential
Limited-slipandlockingdifferentialoperation
Fig5Limited-slipdifferential
Differentialsettlementofacarintheunevenroadsurfaceandsteeringwheel-drivenspeedataboutthedifferentrequirements;butisfollowedbytheexistenceofdifferentialinthesidecarwheelskidcannotbeeffectivewhenthepowertransmission,thatis,thewheelslipcanno
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