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ID:27816491
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页数:11页
时间:2018-12-06
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1、AUTOMATICTRANSMISSIONThemodemautomatictransmissionisbyfar,themostcomplicatedmechanicalcomponentintoday'sautomobile.ltisatypeoftransmissionthatsiftsitself.Afluidcouplingortorqueconverterisusedinsteadofamanuallyoperatedclutchtoconnectthetransmissiontotheengine.Therearetwobasictypesofautomat
2、ictransmissionbasedonwhetherthevehicleisrearwheeldriveorfrontwheeldrive.Onarearwheeldrivecar,thetransmissionisusuallymountedtothebackoftheengineandislocatedunderthehumpinthecenterofthefloorboardalongsidethegaspedalposition.Adriveshaftconnectsthetransmissiontothefinaldrivewhichislocatedint
3、herearaxleandisusedtosendpowertotherearwheels.Powerflowonthissystemissimpleandstraightforwardgoingfromtheengine,throughthetorqueconverter,thentroughthetransmissionanddriveshaftuntilitreachesthefinaldrivewhereitissplitandsenttothetworeartransmission.Onafrontwheeldrivecar,thetransmissionisu
4、suallycombinedwiththefinaldrivetoformwhatiscalledatransaxle.TheengineonafrontwheeldrivecarisusuallymountedsidewaysinthecarwiththetransaxletuckedunderitonthesideoftheenginefacingtherearofthecanFrontaxlesareconnecteddirectlytothetransaxleandprovidepowertofrontwheels.Inthisexample,powerfloes
5、fromtheengine,throughthetorqueconvertertoalargerchainthatsendsthepowerthrougha18()degreeturntothetransmissionthatisalongsidetheengine.Fromthere,thepowerisroutedthroughthetransmissiontothefinaldrivewhereitissplitandsenttothetwofrontwheelsthroughthedriveaxles.Thereareanumberofotherarrangeme
6、ntsincludingfrontdrivevehicleswheretheengineismountedfronttobackinsteadofsidewaysandthereareothersystemsthatdriveallfourwheelsbutthetwosystemsdescribedherearebyfarthemostpopular.Amuchlesspopularrearandisconnectedbyadriveshafttothetorqueconverterwhichisstillmountedontheengine.Thissystemisf
7、oundonthenewCorvetteandisusedinordertobalancetheweightevenlybetweenthefrontandrearwheelsforimprovedperformanceandhandling.Anotherreardrivesystemmountseverything,theengine,transmissionandfinaldriveintherear.ThisrearenginearrangementispopularonthePorscheoThemodernauto
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