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AT09 transfer.pdf

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AT09 TRANSFER
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Automatic Transmissions - Course 262 137 1. Given the clutch application chart for the A340H Transfer Unit, identify the holding devices applied in the following gear positions: w High gear two-wheel drive w High gear four-wheel drive w Low gear four-wheel drive 2. Describe the operation of the sprocket and drive chain in transferring torque to the front axle. Section 9 A340H TRANSFER Lesson Objectives:Section 9 138 TOYOTA Technical Training TheA340Hautomatictransferunitisboltedtotherearofthe transmissionhousingandprovidesameansofselectingbetween 2-wheeldrive(H2),4-wheeldrive(H4)andlow4-wheeldrive(L4), whilethevehicleismoving.Thereisnorestrictiononvehiclespeed whileshiftingbetweenH2andH4.Thereis,however,aspeed requirementwhenshiftingbetweenH4andL4,andthatspeedisless than19mph. Nevermovethefrontdrivecontrolleverifthewheelsareslipping. Thetransferunitusesasimpleplanetarygearassemblytoaccomplish highandlowgearratios.Highgearisadirectdrivethroughthe planetarygearset.Lowgearisareducedgearratiowhenincreased torqueisrequired. Transfer Planetary Gear Provides direct drive in two-wheel and four-wheel drive as well as low-gear four-wheel drive. CAUTION ComponentsA340H TRANSFER Automatic Transmissions - Course 262 139 Thetransferunithasthreeshafts: w Thetransmissionoutputshaft w Thetransferoutputshaft w Thefrontdriveshaft Thetransmissionoutputshaftisconnectedtotheplanetarysungear, andthetransferoutputshaftisconnectedtotheplanetarycarrier.The ringgearisconnectedtothetransferhousingthroughaholdingdevice. Achainsprocketidlesaroundthetransferoutputshaft,andadrive chaintransfersdrivingtorquefromthechainsprockettothefront driveshaft. Threeholdingdevicesareusedtocontroltheplanetarygearset;they are: w TransferDirectClutch(C3) w LowSpeedBrake(B4) w FrontDriveClutch(C4) The transferdirectclutch(C3) locksthesungeartothecarrier,andthe planetarygearsetrotatesasaunit.Thecarrierisconnectedtothe transferoutputshaft. The lowspeedbrake(B4) lockstheringgeartothetransfercase.The sungearisthedrivegear.Withtheringgearlocked,thepiniongears walkaroundtheringandthecarrierturnsthetransferoutputshaftat agearreduction. The frontdriveclutch(C4) locksthetransferoutputshafttothechain sprocketwhichinturndrivesthefrontdriveshaftwiththedrive chain. Aseparatevalvebody,electricsolenoidandmanualvalveoperatethe transferhydrauliccircuit.Themanualvalvehasthreepositionsfor “high2-wheeldrive“(H2),“high4-wheeldrive“(H4)and“low4-wheel drives“(L4).Themanualvalvealonecontrolsthehigh2-and4-wheel drives;however,whenshiftedtothelow4-wheeldriveposition,the numberfoursolenoidpreventsthelowspeedbrakefrombeingapplied untilitisenergized. Thenumberfoursolenoidisenergizedonlyforlow4-wheeldrive(L4). ThesolenoidiscontrolledbytheTCCS/ECTECUwhichmonitors throttleangle,transferpositionswitchandvehiclespeed.Whenthe transferpositionswitchisplacedintheL4positionandtheECU senseslightthrottleandvehiclespeedbelow19mph,itenergizesthe solenoid. Holding Devices Hydraulic ControlSection 9 140 TOYOTA Technical Training Inhigh2-wheeldrive,the transferdirectclutch(C3) isappliedwhich locksthesungeartothecarrier.Sincetheinputtorqueisonthesun gearandtwomembersoftheplanetarygearsetarelockedtogether,we havedirectdrivetotheoutputshaft. Shift Position H2 Inhigh4-wheeldrive,the transferdirectclutch(C3) andthe frontdrive clutch(C4) areapplied.Powerflowthroughthe transferdirectclutch (C3) isdescribedinthepreviousparagraph.Whenthe frontdrive clutch(C4) isapplied,itlocksthechainsprockettothetransferoutput shaft.Torqueistransferredtothefrontdriveshaftthroughthechain. Thetransferfrontdriveshaftdrivesthefrontpropellershaft,front differentialandwheels. Shift Position H4 Power Flow High 2-Wheel Drive (H2) High 4-Wheel Drive (H4)A340H TRANSFER Automatic Transmissions - Course 262 141 Inlow4-wheeldrive,notonlyistorqueavailabletoallwheelsbuta speedreductionandtorqueincreaseisalsoprovidedthroughthe transfercase.The transferdirectclutch(C3) isreleasedandthe low speedbrake(B4) isapplied,lockingtheringgeartothetransfercase. Inputtorqueisonthesungear,whichcausestheplanetarygearsto walkaroundtheringgearanddrivethetransferoutputshaftata reducedspeed.Withthe frontdriveclutch(C4) applied,torqueis transferredtothetransferfrontdriveshaftandallfourwheelsare driven. Shift Position L4 Low 4-Wheel Drive (H4)
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