~AeTheEngineering Society~ ForAdvancing Mobility............, LandSeaAirandSpace® 400COMMONWEALTH DRIVE,WARRENDALE, PA15096·0001 U.S.A. rI s 881840 WorldTransmissions forthe 1990TruckMarket ReeceR.Fuehrer C.Frederic Faude AllisonTransmission Division GeneralMotorsCorporation Truckand/BusMeeting andExposition Indianapolis, Indiana November 7-10,1988Downloaded from SAE International by University of New South Wales, Monday, August 27, 2018Theappearance ofthecodeatthebottomoftheIirstpageofthispaperindicates SAE's consentthatcopiesofthepapermaybemadeforpersonalorinternaluse,orforthepersonal orinternaiuseofspecificclients.Thisconsentisgivenonthecondition, hUl'lever, thatthe copierpaythestatedperarticlecopyfeethroughtheCopyright Ciearance Center,Inc.. Operations Center,21Congress St.,Salem,MA01970forcopyingbeyondi';atpermitted by Sections 107or108oftheU.S.Copyright Law.Thisconsentdoesnotextend,cotherkindsof copyingsuchascopyingforgeneraldistribution, foradvertising orpromotionai pumoses, for creatingnewcollective works,orforresale. Paperspublished priorto1978mayalsobecopiedataperpaperfeeof$2.50underthe abovestatedconditions. SAEroutinelystocksprintedpapersforaperiodofthreeyearsfollowing dateofpUblication. DirectyourorderstoSAEOrderDepartment. Toobtainquantityreprintrates,permission toreprintatechnical paperorpermission touse copyrighted SAEpUblications inotherworks,contacttheSAEPublications Division. AllSAEpapersare abstracted andindelCedin theSAEGlobalMobilityDatabase. SAEGLOBAL MOBIUTY DATABASE NopartofthispUblication maybereproduced inanyform,in anelectronic retrievalsystemorotherwise, withouttheprior writtenpermission ofthepublisher, ISSN0148·7191 Copyright 1988SocietyofAutomotive Engineers, Inc.Downloaded from SAE International by University of New South Wales, Monday, August 27, 2018881840 WorldTransmissions forthe 1990TmckMarket ReeceR.Fuehrer C.FredericFaude AllisonTransmission Division GeneralMotorsCorporation ABSTRACT MARKET DRIVEN Figure1.MarketDrivenFeaturesAllisonstartedwithitsfirstpowershift transmission for off-highway vehiclesin1948andintroduced itsfirstautomatic transmissions fortrucksandbussesin1954.SincethenAllison hasproduced morethan1,600,000 automatic transmissions for heavydutyapplications. In1970,thecurrentAT-MT-HT fami­ lyofautomatic transmissions wasintroduced, andhassince beensuccessfully appliedworldwide. Thisworldwide experi­ encehaspavedthewayforanewlineofautomatic transmis­ sions,theWT. Replacing thecurrentAT-MT-HT hasbeenachallenge. Thesetransmissions covertherangeofmedium/heavy trucks upto59000Kg(130000lb)GVWand332Kw(445HP).They havegainedareputation forqualityanddurability inapplica­ tionsrangingfromschoolbussestoheavyequipment haulers. Toreplacesuchasuccessful productlinehasrequiredacareful studyofthemarket. Thesestudiesstartedinformally in1982.By1984and1985 surveyswerebeingconducted inNorthAmerica, Europeand Japan.Thishasbeenacontinuing processandasthedesign progressed itwasreviewed withcustomers toobtaintheir latestthinking. Figure1showsthebasicmarl<ettrendsas perceived byAllisoncustomers. Firstandaboveallothers camethemessage thattheoptionpriceofaheavydutyAnewlineofon-highway transmissions hasbeendesigned anddeveloped byAllisonTransmission Division. Thisnew productline,identified astheWorldTransmission Series(WT), hasbeendesigned withemphasis oncost-effectiveness, great­ erintegration withvehiclesystemsandadvanced technology to meetmarketdemands intothe21stcentury. Newdesignconcepts bothinpowertraincomponent ar­ rangement andelectronic controlshavebeencoupledutilizing concurrent engineering andsystems engineering principles. Theresultisacustomer-driven product linewhich,when produced byAllison,willexceedworldclassstandards of quality,performance andvalue. INTRODUCTION Thispaperisaboutnewmechanical andelectrical concepts asappliedtoautomatic transmissions fortrucl{s.Itisalso aboutcustomer needs,suppliers, andthedesignprocess.The purpose istoshowhowconcurrent andsystems engineering approaches have