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1、UnitThree3.1DriveLineContentsIPre-questionsIITextExplanationIIIExercisesIPre-questionsHowmanymainunitsdoesthedrivelineassemblyconsistof?Whatarethey?Thedrivelineassemblyconsistsofsixmainunits.Theyareclutch,transmission,driveshaft,finaldrive,differentialandthedrivingwheelsHowdoe
2、sthedrivelinework?Thedrivelinecarriespowerfromtheenginecrankshafttothedrivingwheels,sothewheelsrotateandtheautomobilemoves.II.TextExplanationFig.3-1DriveLine1-clutch;2・transmission;3・universaljoint;4-finaldrive;5-differential;6-driveshaftThetypicaldrivelinecomprisesclutch,tran
3、smission,driveshaft,finaldrive,differentialandthedrivingwheels.译文：典型传动系统一般包括离合器、变速器、传动轴、主减速器、差速器和驱动轮等六部分。Whenyoulifttheclutchpedal,springsforcethepressureplateandclutchplateagainsttheflywheel.译文：当抬起踏板时，压缩弹簧将压盘和从动盘推向飞轮。Amanualtransmissionrequiresaclutchtoapplyandremovetheengine
4、torquetothetransmissioninputshaft・译文：手动变速器需要用离合器来把发动机转矩施加给变速器输入轴或从变速器输入轴撤消。Whenthecarisonstraightroad,theringgear,differentialcase,differentialpiniongears,andtwodifferentialsidegearsallturnasaunitwithoutanyrelativemotion.译文：汽车在直线行驶时，齿圈、差速器壳、差速器行星齿轮和两个差速器半轴齿轮作为一个整体运转，而无任何相对运动。T
5、hedriveshaftsareusuallyhollowinordertoweighless,butofalargediametersothattheyarestrong•译文：传动轴通常是空心的以减轻重量，但直径比较大使它有足够的强度。III.ExercisesI.TranslatethefollowingexpressionsintoChinese.manualtransmissionreverseidlergearsgearratiosdriveshaftclutchplateDifferentialuniversaljointcoilsp
6、ringpressureplateSynchronizer手动变速器倒档齿轮齿轮齿数比传动轴差速器万向节螺旋弹簧压盘同步器II.IdentifytheEnglishnamesofthedrivelineaccordingtothepicture.61engine;2transmission;3driveshaft;4drivingwheel;5clutch;6universaljoint;7finaldriveIII.Readthefollowingpassagecarefullyandfillintheblankswiththeproperfor
7、mofthegivenwords.The(differential)systemispartoftherear-axle-housing(assembly),whichincludesthedifferential,(earaxles),wheeland(bearings)・Iftheautomobileweretobedrivenina(straight)linewithouthavingtomaketurns,thennodifferentialwouldbenecessary.However,whentheautomobileroundsat
8、urn,the(outer)wheelmusttravelfartherthanthe(inner)wheel.Thedi
