高職高專汽車專業(yè)英語

書名：汽車專業(yè)英語ISBN：978-7-111-42342-3作者：盧曉春出版社：機械工業(yè)出版社本書配有電子課件

Task1

TheOperationCycleofanEngineParagraphAtpresent,themostautomobileusesaninternalcombustionengineintheworld.Whatisaninternalcombustionengine?Howdoestheinternalcombustionenginework?EngineConstruction

FourstrokesThemostcommonengineisthefour--strokepistonengine．Thesefourstrokesareintakestroke,compressionstroke，powerstrokeandexhauststroke.IntakeStrokeTheintakestrokeofafour-strokeenginebeginswiththepistonattopdeadcenter(TDC)．Thestartercausesthecrankshafttorotateinaclockwisedirection（Fig.2-3）．

Thecrankshaft，throughtheconnectingrod，forcesthepistontomovedownward．Thisdownwardmovementofthepistoncreatesavacuum，adifferenceinpressure，inthespaceabovethepiston．Theenginemanufacturertimestheintakevalveactionsothatitopensautomaticallyatorslightlybeforethepistonstartsdown．Therefore,amixtureofgasolineandair，pushedbytheatmosphericpressureoutsidetheengine,rushesthroughtheintakemanifoldandintotheenginecylinder．Atthesametime,theexhaustvalveremainsclosedduringthisdownwardstrokeofthepiston.Thisvalveclosurepreventstheenteringair／fuelchargefromescapingthroughtheexhaustport.Afterthepistonreachesthebottomofitsfirststroke,thecylinderispracticallyfullofanair／fuelcharge．Thedrawingofanair／fuelchargeintothecylinderinthismanner，duringthedownwardmovementofthepiston，constitutestheintakestrokeofthepiston．CompressionStrokeAfterthepistonreachesbottomdeadcenter(BDC)，itmovesupwardagainasthestartercontinuestoturnthecrankshaftinaclockwisedirection．Asthepistonisbeginningtomoveupward，theintakevalvecloses，andtheexhaustvalveremainsclosed．Sincebothvalvesareclosed，thepistoncompressestheair／fuelmixtureinthesmallspacebetweenthetopofthepistonandthecylinderhead．AsthepistonreachesTDCagainduringitsupwardtravel，thecompressionstrokeofthepistonisover．Theair／fuelchargeisnowundercompressionsothatitwillproduceagreatdealofpowerwhenthesparkplugignitesit．

PowerStrokeJustasorslightlybeforethepistonreachesTDConthecompressionstrokewiththeair／fuelmixturefullycompressed，atimedelectricalsparkappearsatthesparkplug．Thissparkignitesthecompressedair／fuelmixture．Theburningmixturebeginstoexpand；thepressureinthecombustionchamberabovethepistonimmediatelyincreases．Thisresultsinahighpressureappliedtothetopofthepiston．Now，bothvalvesremainclosedduringthepowerstroke．Thisassuresthatthetotalforceoftheexpandinggasappliesitselftotheheadofthepiston．Thistremendousforcepushesthepistondownwardonthepowerstroke，causingtheconnectingrodtorotatethecrankshaft.Inotherwords，theforceresultingfromtheexpansionoftheburningair／fuelmixtureisturningthecrankshaft．ExhaustStrokeNeartheendofthedownwardmovementofthepistononthepowerstroke，thecamshaftopenstheexhaustvalve，buttheintakevalveremainsclosed．Althoughmuchofthegaspressurehasexpendeditselfdrivingthepistondownward，somepressurestillremainswhentheexhaustvalveopens．Thisremainingpressurizedgasflowscomparativelyfreelyfromthecylinderthroughthepassage(port)openedbytheexhaustvalve.Then，asthepistonagainmovesupinthecylinder，itdrivesanyremaininggasesoutofthecylinderpasttheopenexhaustvalve．AsthepistontravelsthroughtheTDCpositionandstartsdownwardagaininthecylinder，anewoperatingcyclebegins．Thefourstrokesarecontinuouslyrepeatedineverycylinderaslongastheengineremainsrunning．IntakeValvePistonExhaustValveSparkPlugFig.2-5ExhaustStrokeWords&expressionsvehicle：交通工具，車輛

charge：充氣，裝料

engine：發(fā)動機，引擎，

draw：吸引，吸人

stroke：沖程，行程

constitute：組成，構(gòu)成

piston：活塞

ignite：點火，點燃

crankshaft：曲軸

spark：火花

intake：入口，進(jìn)口，吸入

combustion：燃燒

clockwise：順時針方向

port：通道，港口，端口

gasoline：汽油

internalcombustionengine：內(nèi)燃機

manifold：進(jìn)、排氣歧管

intakestroke：進(jìn)氣行程

remain：保持，逗留，剩余

compressionstroke：壓縮行程

air／fuelmixture：空氣燃油混合物(可燃混合氣

exhauststroke：排氣行程

powerstroke：作功行程

connectingrod：連桿

topdeadcenter(TDC)：上止點

atmosphericpressure：大氣壓力

intakevalve：進(jìn)氣門

bottomdeadcenter(BDC)：下止點

exhaustvalve：排氣門

sparkplug：火花塞

Task2

ConnectingRodandCrankshaftParagraphConnectingrodandcrankshaftConnectingrodandcrankshaftisveryimportantframeworkoftheengine,whichconvertstheheatenergyoffuelintomechanicalenergyformovingthevehicle．Howdoesitisachieve?PistonTheenginemanufacturerfitsapistonintoeachcylinderoftheengine．Thepistonisamovablepartorplugthatreceivesthepressurefromtheburningair／fuelmixtureandconvertsthispressureintoreciprocating(up-and-down)motion.Manufacturersmakemostenginepistonsfromaluminum,whichislessthanhalftheweightofiron.Ironpistonswerecommoninearlyautomotiveengines.

PistonRingsSomeoperatingclearancemustexistbetweenthepistonandthecylinderwall；however，someformofsealisnecessarybetweenthepistonandthecylinderwalltopreventblowby．Consequently，pistonringsareusedtoprovidethenecessarysealtoeliminateblowbyandtocontroloilconsumption.Automotivepistonshavetwokindsofrings：compressionandoilcontrol．Thecompressionringsprimarilysealagainstthelossofair／fuelmixtureasthepistoncompressesitandalsothecombustionpressureasthemixtureburns．Whilethefunctionoftheoilcontrolringistopreventexcessiveamountsofoilfromworkingupintothecombustionchamber．

CompressionRingCompressionOilRingPistonPistonConnectingRodConnectingRodBearingConnectingRodCapFig.2-7PistonConnectingRodsAsmentionedearlier，thepistonmovesupanddowninthecylinder，inareciprocatingmotion．Inordertorotatethedrivewheels，aconnectingrodandcrankshaftmustchangereciprocatingmotiontorotary．Theconnectingroditselfattachesatoneendtothepistonandontheotherendtothecrankpinsectionofthecrankshaft．CrankshaftThecrankshaftisthemainrotatingmember，orshaft，oftheengine．Itsfunction，alongwiththeconnectingrod，istochangethereciprocatingmotionofthepistontorotary．Inaddition，thecrankshaftisresponsiblefordrivingthecamshaftthroughtiminggears,plusoperatingtheaccessoriesviaasystemofbeltsandpulleys．Lastly，thecrankshaftCarriesthetotaltorque-turningortwistingeffortanddeliversittotheflywheel．Fromtheflywheelthetorquethenpasseseithertothefrictionclutchassemblyortothetorqueconverter．

Designedintotheone-piececrankshaftareareasformainbearingjournals，crankpins，counterweights，flywheelflange，anddrivinghub．

FlywheelTheflywheelisacomparativelyheavywheel，boltedtotheflangeontherearendofthecrankshaft．Itsfunctionistokeeptheenginerunningsmoothlybetweenpowerstrokes．Itsinertiatendstokeeptheflywheelrotatingataconstantspeed．Theflywheelalsohasseveralotherfunctions．Forexample，theflywheelhasgearteetharounditsoutercircumference．Theseteethmeshwithteethlocatedonthestartingmotordrivepinioninordertocranktheengineover．Inaddition,therearsurfaceoftheflywheelservesasthedrivingmemberoftheclutchassembly．Words&expressionsreciprocating往復(fù)的 Crankpin曲柄銷，連桿軸頸 Plus加上，以及

Counterweight平衡物，平衡重 Blowby竄氣

Flange凸緣，邊緣，輪緣

Via經(jīng)，通過，經(jīng)由

flywheel飛輪

Clutch離合器

Circumference

周圍;圓周

pistonring活塞環(huán)bearingcap軸承蓋compressionring氣環(huán)thrustwasher推力墊片oilcontrolring油環(huán)mainbearing主軸承connectingrod連桿connectingrodcap連桿蓋connectingrodbearing連桿軸承

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