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毕业设计 外文翻译 THERESEARCHSOF AMTSHIFTINGSCHEDULES Themodernautomatictransmissionisbyfar,themostcomplicatedmechanical componentintoday`sautomobile.Itisatypeoftransmissionthatsiftsitself. Afluidcouplingortorqueconverterisusedinsteadofamanuallyoperatedclutch toconnectthetransmissiontotheengine. Therearetwobasictypesofautomatictransmissionbasedonwhetherthe vehicleisrearwheeldriveorfrontwheeldrive.Onarearwheeldrivecar, thetransmissionisusuallymountedtothebackoftheengineandislocated underthehumpinthecenterofthefloorboardalongsidethegaspedalposition. Adriveshaftconnectsthetransmissiontothefinaldrivewhichislocatedin therearaxleandisusedtosendpowertotherearwheels.Powerflowonthis systemissimpleandstraightforwardgoingfromtheengine,throughthetorque converter,thentroughthetransmissionanddriveshaftuntilitreachesthe finaldrivewhereitissplitandsenttothetworeartransmission. Onafrontwheeldrivecar,thetransmissionisusuallycombinedwiththe finaldrivetoformwhatiscalledatransaxle.Theengineonafrontwheeldrive carisusuallymountedsidewaysinthecarwiththetransaxletuckedunderit onthesideoftheenginefacingtherearofthecar.Frontaxlesareconnected directlytothetransaxleandprovidepowertofrontwheels.Inthisexample, powerfloesfromtheengine,throughthetorqueconvertertoalargerchainthat sendsthepowerthrougha180degreeturntothetransmissionthatisalongside theengine.Fromthere,thepowerisroutedthroughthetransmissiontothefinal drivewhereitissplitandsenttothetwofrontwheelsthroughthedriveaxles. Thereareanumberofotherarrangementsincludingfrontdrivevehicleswhere theengineismountedfronttobackinsteadofsidewaysandthereareother systemsthatdriveallfourwheelsbutthetwosystemsdescribedhereareby farthemostpopular.Amuchlesspopularrearandisconnectedbyadriveshaft tothetorqueconverterwhichisstillmountedontheengine.Thissystemis foundonthenewCorvetteandisusedinordertobalancetheweightevenlybetween thefrontandrearwheelsforimprovedperformanceandhandling.Anotherrear drivesystemmountseverythingtheenginetransmissionandfinaldriveinthe rear.T