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Allison Transmission 3000 Series User Manual

Allison Transmission 3000 Series
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10.0TRANSMISSIONCOMPONENTS
10.1TORQUECONVERTER
Thetorqueconvertermultipliesenginetorqueandtransferssmooth,
uninterruptedpowertothewheelsquickly.Thetorqueconverterconsistsof
thesefourcomponents:
Pump–inputelementdrivendirectlybytheengine
Turbine–outputelementhydraulicallydrivenbythepump
Stator–reaction(torquemultiplying)element
LockupClutch–mechanicallycouplesthepumpandturbinewhen
commandedbytheTransmissionControlModule(TCM).
Whenthepumpturnsfasterthantheturbineandthestatorisstationary,the
torqueconverterismultiplyingtorque.Whentheturbineapproachesthe
speedofthepump,thestatorstartstorotatewiththepumpandturbine.When
thisoccurs,torquemultiplicationstopsandthetorqueconverterfunctionsasa
uidcoupling.Thelockupclutchislocatedinsidethetorqueconverterand
consistsofthefollowingcomponents:
Pistonandbackplate–drivenbytheengine
Clutchplate/damper(locatedbetweenthepistonandthe
backplate)–splinedtotheconverterturbine
Thelockupclutch/torsionaldamperisengagedandreleasedinresponseto
electronicsignalsfromtheTCM.Lockupclutchengagementprovidesadirect
drivefromtheenginetothetransmissioninput.Thiseliminatesconverter
slippageandmaximizesfueleconomyandvehiclespeed.Thelockupclutch
releasesatlowerspeedsorwhentheTCMdetectsconditionsrequiringitto
bereleased.
Thetorsionaldampertriestoabsorbenginetorsionalvibrationinanattempt
topreventtransmittingenginetorsionalvibrationonthroughtotransmission
components(clutches,etc),oritemsboltedtothetransmission.
147

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Allison Transmission 3000 Series Specifications

General IconGeneral
TypeAutomatic Transmission Controller
Control ModuleIntegrated
Shift Energy ManagementYes
Number of Gears6
Torque ConverterYes, with lock-up clutch
RetarderOptional
PTO ProvisionYes
Input Voltage12V or 24V
Communication ProtocolSAE J1939
Operating Temperature Range-40°C to +85°C

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