2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、1附錄原文：原文：TransmissiondesignAsweallknowautomobileenginetoacertainspeedcanbeachievedunderthebestconditionswhencomparedissuedbythepowerfueleconomyisrelativelygood.Therefewehopethattheengineisalwaysinthebestofconditionstowku

2、nder.Howevertheuseofmotvehiclesneedtohavedifferentspeedsthuscreatingaconflict.Transmissionthroughthisconflicttoresolve.AutomotiveTransmissionrolesumupinonesentencecalledvariablespeedtwistingtwistingslowdownthegrowthrateb

3、yincreasingtsional.WhycanslowdownbytwistingthegrowthratebutalsobytwistingFthesameenginepoweroutputpowercanbeexpressedasN=wTwherewistheangularvelocityofrotationTNiuju.WhenNfixedwTisinverselyproptionaltothe.Therefethegrowt

4、hratewillreducetwistingtwistingslowdownwillincrease.AutomotiveTransmissionspeedgearbasedontheprincipleofvariabletwistedintovariousstallsofdifferenttransmissionratiocrespondingtoadapttodifferentoperationalconditions.Gener

5、altosetupamanualgearboxinputshaftintermediateshaftoutputshaftalsoknownasthethreeaxisaswellasDaodangaxis.Threeaxisisthemaintransmissionstructureinputshaftspeedisthespeedoftheenginetheoutputshaftspeedistheintermediateshaft

6、outputshaftgearmeshingbetweendifferentfromthespeed.Differentgearsaredifferenttransmissionratiowillhaveadifferentspeed.FexampleZhengzhourichanZN6481W2GmanualtransmissioncarSUVitstransmissionratioare:1File3.704:1stalls2.20

7、2:1stalls1.414:1stalls1:15stalls(speedingfile)0.802:1.WhendriverschoosealaunchvehiclestallsPlectrumwillbe12filesynchronizationengagementwithabackstallgearoutputshaftlockitthepowerinputshaftintermediateshaftoutputshaftgea

8、rofastallastalltheoutputshaftgeardriventheoutputshaftpowerwillbetransmittedtothedriveshaft(redarrow).AtypicalstallBiansuchiluntransmissionratiois3:1thatistosaythreelapstotheinputshaftoutputshafttoacircle.Whenthegrowthrat

9、eofcardriverschoosetwostallsPlectrumwillbe12file3shaft.DaodangusuallyusedfthesynchronizationcontrolalsojoinsfivestallsstallsDaodang5positioninthesameside.AsadlegearthegeneraltransmissionDaodangtransmissionratiogreatertha

10、n1filetransmissionratiobytwistingsteepslopewithsomevehiclesencounteredontheprogressstallsfalterswithaDaodangboost.Ridefromthedriveroftheconsiderationsbettertransmissionstallstalladjacentstallmethanthetransmissionchangest

11、heratioofsmalleasytoshiftsmoothly.Howevertheshtcomingsofthestallsismetransmissionstructureiscomplicatedbulkylightvehicletransmissionisgenerally45stalls.Atthesametimetransmissionratioisnotintegralbutwithallofthedecimalpoi

12、ntitisbecauseofthegearteethmeshingisnotcausedbythewholemultiplesoftwogearteethcanleadtothewholemultiplesoftwomeshinggearsofunevenwearmakingthetoothsurfacequalityhaveagreaterdifference.ManualtransmissionsynchronizerManual

13、transmissionisthemostcommontransmissionMT.ItsbasicstructuresumupinonesentenceisatwoaxleshaftwhereinputshafttheshaftaxisintermediateshaftwhichconstitutethemainbodyofthetransmissionofcourseaDaodangaxis.Manualtransmissionkn

14、ownasmanualgeartransmissionwhichcanbeintheaxialslidinggearsthegearsmeshingdifferentvariablespeedreachedtwistingpurpose.Typicalmanualtransmissionstructureprinciplesareasfollows.Inputshaftalsosaidthatthefirstaxisitsfronten

15、dSplinedrivendirectlywiththeclutchdiscsetswiththeSplinebythetransferoftquefromtheengine.Thefirstaxisoftheintermediateshaftgearsmeshinggearsoftenaslongastheshaftaxistoaturntheintermediateshaftgearalsowillberotating.Viceal

16、sosaidintermediateshaftaxistheaxisevenmethanthesizegear.Alsoknownasthesecondoutputshaftaxistheaxisofvarioussetsofgearstallprogresscanbemanipulatedatanytimeintheroleofthedevicethecrespondingintermediateshaftgearmeshingthu

17、schangingitsspeedtque.Withtheendoftheoutputshaftsplineassociatedwiththedriveshaftthroughthedriveshafttquetransmittedtothedriveaxlereducer.Thusprogressstallsdrivetransmissionpathis:inputshaftgearoftenrodentsoftenrodentsin

18、termediateshaftgearcrespondingintermediateshaftgearthesecondaxiscrespondinggear.Reversingthegearshaftcanbemanipulatedbythedevicepickintheaxismovementtheintermediateshaftoutputshaftgearmeshinggearstothecontrarytothedirect

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