文献翻译—无级变速器

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1、附录AABSTRACTHighclampingforcelevelsreducetheefficiencyoftheContinuouslyVariableTransmission(CVT).However,highclampingforcelevelsarenecessarytopreventslipbetweenthebeltandthepulleys.Ifasmallamountofslipisallowed,theclampingforcelevelcanbereduced.Toachievethis,slipi

2、naCVTisinvestigated.Frommeasurementsonanexperimentalsetup,Tractioncurvedataandefficiencymeasurementsarederived.AmodeldescribingslipinaCVTisverifiedusingmeasurementswithabeltwithincreasedplay.Itisfoundthatsmallamountsofslipcanbecontrolledinastablewayonthesetup.The

3、tractioncurvewasmostlydependentontheCVTratio.Efficiencyisfoundtobehighestfor1to2%slipdependingontheratio.Themodelisinreasonableagreementwiththemeasurements.1.IntroductionApplyingaContinuouslyVariableTransmission(CVT)inanautomotivedrivelinehasseveraladvantages.ACV

4、Tcanoperateatawiderrangeoftransmissionratios,thereforetheenginecanbeoperatedmoreefficientlythanwithasteppedtransmission.Also,aCVTdoesnotinterruptthetorquetransmissionwhenshifting.Thisgivesamoresmoothridethanasteppedtransmissiondoes.AV-beltbasedContinuouslyVariabl

5、eTransmissionusesabeltorachaintotransmittorquefromadrivingsidetoadrivensidebymeansoffriction.ThelayoutoftheCVTandtheV-beltareshowninfigure1.Thevariatorconsistsoftwopulleyswhicharewedgeshaped.BychangingthepositionofthepulleysheavestheratiooftheCVTcanbeadjusted.The

6、V-beltconsistsofblockswhichareheldtogetherbytworingsthatinturnexistofasetofbands.Toachievetorquetransmissionsufficientlyhighclampingforcelevelsareneededtopreventslipinthevariator.Becausethetorquelevelisnotexactlyknownatalltimes,sincenotorquesensorisusedduetocostc

7、onsiderations,asafeclampingforcelevelbasedonthemaximumpossibleloadismaintainedatalltimes.Thissafetylevelisbaseduponassumedmaximumshockloadlevelsfromtheroad,likebumps,andtheenginetorque.Inordertomaintainthesesafetylevelshigherclampingforcelevelsaremaintainedthenne

8、eded.HigherclampingforcelevelscausemorelossesintheCVT.Theselossesarecausedbyincreasesinpowerconsumedbythehydraulicpump,by16increasesinthelossesduetoslipinthebe