汽车变速器有关外文文献(A Short Course on Automatic Transmission)

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1、AShortCourseonAutomaticTransmissionsbyCharlesOfriaThemodernautomatictransmissionisbyfar,themostcomplicatedmechanicalcomponentintoday'sautomobile. Automatictransmissionscontainmechanicalsystems,hydraulicsystems,electricalsystemsandcomputercontrols,allworkingtogetherinperfectharmonywh

2、ichgoesvirtuallyunnoticeduntilthereisaproblem.Thisarticlewillhelpyouunderstandtheconceptsbehindwhatgoesoninsidethesetechnologicalmarvelsandwhatgoesintorepairingthemwhentheyfail.Thisarticleisbrokendownintofivesections:·Whatisatransmissionbreaksdowninthesimplesttermswhatthepurposeofat

3、ransmissionis.·TransmissionComponentsdescribesthegeneralprincipalsbehindeachsysteminsimpletermstohelpyouunderstandhowanautomatictransmissionworks.·Spottingproblemsbeforetheygetworseshowswhattolookfortopreventaminorproblemfrombecomingmajor. ·Maintenancetalksaboutpreventativemaintenan

4、cethateveryoneshouldknowabout.  ·Transmissionrepairsdescribesthetypesofrepairsthataretypicallyperformedontransmissionsfromminoradjustmentstocompleteoverhauls.  Whatisatransmission?Thetransmissionisadevicethatisconnectedtothebackoftheengineandsendsthepowerfromtheenginetothedrivewheel

5、s. AnautomobileenginerunsatitsbestatacertainRPM(RevolutionsPerMinute)rangeanditisthetransmission'sjobtomakesurethatthepowerisdeliveredtothewheelswhilekeepingtheenginewithinthatrange. Itdoesthisthroughvariousgearcombinations.Infirstgear,theengineturnsmuchfasterinrelationtothedrivewhe

6、els,whileinhighgeartheengineisloafingeventhoughthecarmaybegoinginexcessof70MPH. Inadditiontothevariousforwardgears,atransmissionalsohasaneutralpositionwhichdisconnectstheenginefromthedrivewheels,andreverse,whichcausesthedrivewheelstoturnintheoppositedirectionallowingyoutobackup. Fin

7、ally,thereistheParkposition. Inthisposition,alatchmechanism(notunlikeadeadboltlockonadoor)isinsertedintoaslotintheoutputshafttolockthedrivewheelsandkeepthemfromturning,therebypreventingthevehiclefromrolling.Therearetwobasictypesofautomatictransmissionsbasedonwhetherthevehicleisrearw

8、heeldriveorfrontwhe