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中英文翻译-- V带传动.doc

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中英文翻译-- V带传动.doc

TheVbeltDriveAbstractThevbeltdrivearewidelyusedinallkindsofmachanics,Sotounderstandandknowhowtodesignitisverynecessary.Thevbeltandthepulleyaretwomostimportantpartsofvbeltdrive,thecentredistance,thediameterofthepulleysandtherpmofthepulleysarethemostessentialparametersofthevbeltdrive.Thevbeltdrivehasadrivepulleyandapowertakeoffpulley,wedesigntheirdiametersinthebasisofspeedratio.KeywordsvbeltdrivecentredistancepulleydiameterspeedratioTheVbeltdrivehasadrivepulleyandapowertakeoffpulleyandanendlessVbeltrotatingaroundbothpulleys.ThisVbeltdriveisequippedwithatorquemeasuringdeviceinthatanrpmsensorisassignedtoboththedrivepulleyandthepowertakeoffpulley,whichcontinuouslydetectsthepulleyrpm,thetworpmsensorsareconnectedwithanelectroniccontrolwhichdeterminesthegearratiobetweenthedriveandthepowertakeoffpulleysfromthedetectedrpm,acalibrationdevice,whichassociatesasetgearratiowithadefinedtorqueisconnectedwiththeelectroniccontrol,andtheelectroniccontrolisconnectedwithanelectronicevaluator.TheinventionrelatestotheprovisionofaVbeltdrive,whereitispossibletodeterminethetorqueexistingatdifferentdriveloadsbysimplemeansandinanoptimalmanner,asafunctionofthecooperatingpartsoftheVbeltdrive,i.e.drivepulley,powertakeoffpulleyandVbelt,andtocontrolandadjustitinthisway.TheVbeltdriveinaccordancewiththeinventionisequippedwithatorquemeasuringdevice,whichusesthedepthofpenetrationoftheVbeltintheVbeltgroovesofthedriveandpowertakeoffpulleys,whichheretoforeoftenhadbeenconsideredtobeslippageandhadnotbeentakenintoaccount,aswellasthevariablegearratiocausedtherebyandcomparesthisgearratio,whichcontinuouslychangesasafunctionoftheloadonthedrivepulley,inanelectronicdevicewithapredeterminedtorque,evaluatesthedifferencesobtainedinthismannerforthechangingtorques,whichresultsintherespectivelyactualtorque.Bymeansofthisitispossibleinasimpleandassuredmannertocontrolandadjustthetorqueatthesametimedetectandimmediatelyremedydevelopingtroubles,overloads,wearandthelikeinconnectionwiththevariousmachinesanddevicestobepowered,suchasagriculturalmachinery,industrialmachineryandthelike.DifferingrotationaldiametersofthebeltarecausedbythesedifferingpenetrationdepthsoftheVbeltand,becauseofthat,differentrpmofthetwopulleys.TheRPMorgearratioofthetwopulleysischangedbymeansofthisaction.Tocompensateforthisaction,theRPMorgearratioischangedbymeansoftherpmsensors,dependingontheloadonthedrivepulleyandthepenetrationdepthintobothpulleysoftheVbelt.Therpmofbothpulleysiscontinuouslydetectedbymeansoftherpmsensors,andthesenumbersareenteredintotheelectronicdevice,whichformsaRPMgearratiotherefrom.InthenoloadconditionorwithaknownloadoftheVbeltdriveacalibrationisperformedinthecalibrationdevicebyassigningtheRPMorgearratiotoasettorque.Theforegoingdescriptionofthespecificembodimentswillsofullyrevealthegeneralnatureoftheinventionthatotherscan,byapplyingcurrentknowledge,readilymodifyand/oradaptforvariousapplicationssuchspecificembodimentswithoutdepartingfromthegenericconcept,and,therefore,suchadaptationsandmodificationsshouldandareintendedtobecomprehendedwithinthemeaningandrangeofequivalentsofthedisclosedembodiments.Itistobeunderstoodthatthephraseologyorterminologyemployedhereinisforthepurposeofdescriptionandnotoflimitation.Thepurposeofunderstandingtheabovetheorysistodesignthevbeltdrive.Thetotaldesignrequirementistogetthebestdistancebetweenthecentresofthetwopulleys.Ofcourse,thedesignerhasafewknownconditionsbeforehe/shestartthedesign,suchastherpmofthedrivepulley,thegearratiobetweenthedrivepulleyandthepowertakeoffpulleyortherpmofthepowertakeoffpulley,thepowertobetransmittedandtheworkcircumstancesofthevbeltdrive.Thefinalpurposeofthedesignistomakethevbeltdrivehavetheleastsizeinthebasisofmeetingtoalltheworkrequirements.Asknowntoall,thevbeltisoneofthemostimportantpartofthevbeltdrive.Soitisimportanttocomprehendtheconstructionofthevbeltandtochooseit.therayonandrubbervbeltarewidelyusedforpowertransmission.Suchbeltsaremadeintwoseriesthestandardvbeltandthehighcapacityvbelt.Thebeltscanbeusedwithshortcertredistancesandaremadeendless.Oneofthevirtuesofthevbeltisthatthecostislow,andpoweroutputmaybeincreasedbyoperatingseveralbeltssidebyside.Allthebeltsinthedriveshouldstretchatthesamerateinordertokeeptheloadequallydividedamongthem.Whenoneofthebeltsbreaks,thegroupmustusuallyberaplaced.Thedrivemaybeinclindatanyanglewithtightsideeithertoporbottom.Anotheradvantageisthattheincludeangleforthebeltgrooveisusuallyfrom34to38,thewidingactionofthebeltinthegroovegivesalargeincreaseinthetractiveforcedevelopedbythebelt.Anotherimportantpartofthevbeltdriveisthepulley,itmaybemadeofcastiron,sheetsteelordiecastmetal,graycastironiswidelyusedofallthesematerials.WhenthespeedoftheVbeltisnotmorethan25m/s,weshouldadoptHT150asthematerialsofthepulleysWhenthespeedisbetween25to30m/s,weshoulduseHT200Whenthespeedisbetween25to45,thenwecanemploynodularcastiron,caststeelorforgedsteel,wealsocanweldthepunchedsteelplatetouseasthepulleys.Whenthepowerdeliveredisnotverymuch,thepulleysalsocanbemadeincastaluminumorplastic,Thepulleyiscomposedbywheelflange,webandwheelnave.Pulleyareonthemarketthatpermitanadjustmentinthewidthofthegroove.Theeffectivediameterofthepulleyisvaried,andthemoderatechangesinthespeedratiocanbesecured.Usually,thesmallpulleyisthedrivepulley,andthelargeoneisusedasthepowertakeoffpulley.AfterweunderstandtheusualstructureoftheVbeltDrive,weshouldanalysetheforceoftheVbelt,theanalysisoftheVbeltismoreimportant,themainforcesarepullingforceandstress,andthestressincludepullingstress,bendingstressandcentrifugalstress.Thedesignermustmakethepullingforceandthestressarenotmorethanthepermanentvalues.Inordertoavoidtheslipslide,wealsoshouldmakethetransmittedpower,thepullingforceandthespeedofVbelttosatisfiedsomerelations,itisPFV/1000.Inoneword,thedesignstandardoftheVbeltmustbesatisfied,itistosay,theVbeltnotslipslidewhenittransmitastaticpower,andatthesametime,theVbelthasenoughfatigueresistanceandadefinitelifetime.V带传动摘要v带传动被广泛应用于各种机械中,因此去理解它并知道如何去设计它是十分必要的。V带和带轮是v带传动的两个最重要的组成部分,中心距、带轮直径和转速是v带传动中最基本的参数。V带传动包含一个主动轮和一个从动轮,我们根据传动比来设计它们的直径关键词v带传动中心距带轮直径传动比v带传动装置包括一个主动皮带轮、一个从动皮带轮和一个无接头的绕两带轮旋转的v形带。这样的v带传动装置需要有一个扭矩测量装置,为此要在主动轮和从动轮上都要装有速度测量器,它能连续地、时时地检测出皮带轮的转速。这两个速度测量器是用一电子控制装置相连接的,这种电子控制装置能根据带轮转速确定主、从动轮之间的传动比,另外还有一个校准装置,它能在限定的扭矩范围内帮助设定传动比,它是与电子控制装置连接在一起的。V带设计还要牵涉到v带传动装置的预防保护措施,即如何能方便地针对不同的传动负载来确定最佳的扭矩,并能具有协调v带传动的功能。比如,协调控制主、从动轮和v带之间的传动。V带传动及其设计是要得益于扭矩测量装置,该装置利用v带在主、从动轮轮槽内的置入深度去测量两者之间的扭矩差,而这种差别通常被称为滑差而忽略不计,就像齿轮的传动比略有变化一样。不过,与齿轮相比,带轮的传动比更容易随带轮所传递载荷的变化而变化,这种电子测量装置中有预先设定好的扭矩,它能在扭矩不断变化的情况下估算出差值,并可由它去进行调节以得到合适的扭矩。以这种简单而有效的方式不仅可以控制和调节扭矩,而且还可以检测并及时消除一些差错、过载、疲劳,在和其他设备和机械连接使用时同样可以具有这样的功能,比如在农业机械和工业机械中均有应用。V带在轮槽中的不同置入深度会引起v带有不同的旋转直径,因此,也会造成两带轮的转速不同,而且带的转速和传动比也因此而变化。要致力于解决这个问题,就要明白带速或传动比是由速度测量装置依据主动带轮的载荷和两带轮在轮槽中的置入深度而影响和控制的。两带轮的转速是通过测速器不停地检测而得到的,这些数据被传入电子控制装置,它将依据此进行调节而得到一个新的传动比。在无载荷或有一已知载荷的v带传动的情况下,校检装置可通过调节转速和传动比去适应扭矩,从而可使v带传动以最优化运行。以上具体的描述比较全面地展现了其他设计所具有的一般思路、性质,就是要充分地应用所学的知识去设计,并且要能随时地调整和修改所设计的东西以满足不同的需要。这些具体的设计当然也离不开一般的设计理念。因此,这些改进和修正应当在展现具体设计的意义和作用的前提下倾向于更加复杂化。由此不难明白我们所学的专业术语或专门用语是用于对设计进行描述的,而不是用来限制的。理解以上理论的目的是为了进行v带传动的设计。总的设计要求是得到最优中心距和最小直径。当然,设计者在开始设计之前会有一些已知条件,比如小

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