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AT01 -fundamental of AT AUTOMATIC TRANSMISSIONS.pdf

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AT01 FUNDAMENTAL OF AT AUTOMATIC TRANSMISSIONS
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Automatic Transmissions - Course 262 1. Compare the function of automatic transmission systems of front- and rear-wheel drive transmissions. 2. List the three major component systems used in Toyota automatic transmissions which: a. Transfer torque from the engine. b. Provide varying gear ratios. c. Regulate shift quality and timing. 3. Identify the three types of holding devices used in Toyota automatic transmissions. Section 1 FUNDAMENTALS OF AUTOMATIC TRANSMISSIONS Lesson ObjectivesSection 1 2 TOYOTA Technical Training Automatictransmissionscanbebasicallydividedintotwotypes:those usedinfront-engine,front-wheeldrive(FF)vehiclesandthoseusedin front-engine,rear-wheeldrive(FR)vehicles. Transmissionsusedinfront-wheeldrivevehiclesaredesignedtobe morecompactthantransmissionsusedinrear-wheeldrivevehicles becausetheyaremountedintheenginecompartment.Theyare commonlyreferredtoasa“transaxle.“ Automatic Transmission Types The basic function and purpose for either front or rear drive automatic transmissions are the same. Thedifferentialisanintegralpartofthefront-wheeldrive transmission,whereasthedifferentialfortherear-wheeldrive transmissionismountedexternally.Theexternaldifferentialis connectedtothetransmissionbyadriveshaft. Thebasicfunctionandpurposeforeitherfrontorreardriveautomatics arethesame.Theysharethesameplanetarygeartraindesignwhich isusedinallToyotaautomatictransmissionsandthemajorityof automaticsinproductiontoday. Types of Automatic TransmissionsFUNDAMENTALS OF AUTOMATIC TRANSMISSION Automatic Transmissions - Course 262 Theautomatictransmissioniscomposedofthreemajorcomponents: w Torqueconverter w Planetarygearunit w Hydrauliccontrolunit Forafullunderstandingoftheoperationoftheautomatic transmission,itisimportanttounderstandthebasicroleofthese components. Thetorqueconverterprovidesameansofpowertransferfromtheengine totheinputshaftofthetransmission.Itactslikeanautomaticclutchto engageenginetorquetothetransmissionandalsoallowstheengineto idlewhilethevehicleisstandingstillwiththetransmissioningear. Theplanetarygearunitprovidesmultiplegearratiosintheforward directionandoneinreverse.Thedesignincludestwosimpleplanetary gearsetsandacommonsungear.Theseratiosareprovidedbyuseof holdingdeviceswhichholdmembersoftheplanetaryset.These holdingdevicescanbemultiplateclutchesorbrakes,brakebandsor one-wayclutches. Thehydrauliccontrolunitregulateshydraulicpressureandshift pointsbasedonvehiclespeedandthrottleposition.Itismadeupofa highlyprecisionhousingandspoolvalveswhicharebalancedbetween springtensionandhydraulicpressure.Thespoolvalvesinturncontrol hydraulicpassagestoholdingdevicesandregulatepressure. Major Transmission Components Torque Converter - Transfers engine torque.. Planetary Gear - Multiple gear ratios. Valve Body - Hydraulic control unit
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