800669 TheCLBT9680 anAutomatic Transmission forOff-highway Vehicles J.R.AllenandJ.P.Cornet DetroitDieselAllison DivisionofGeneralMotorsCorporation Earthmoving IndustryConference CentralIllinoisSection Peoria,IL April14·16,1980Downloaded from SAE International by University of Leeds, Monday, August 13, 2018Theappearance ofthecodeattheboltomofthefirstpageofthispaperindicates SAE'sconsentthatcopiesofthepapermaybemadeforpersonal orinternaluse,or forthepersonal orinternaluseofspecificclients.Thisconsentisgivenonthecon­ dition,however, thatthecopierpaythestatedperarticlecopyfeethroughthe Copyright Clearance Center,Inc.,Operations Center,P.O.Box765,Schenectady, N.Y.12301,forcopying beyond thatpermitted bySections 107or108oftheU.S. Copyright Law.Thisconsentdoesnotextendtootherkindsofcopyingsuchas copying forgeneraldistribution, foradvertising orpromotional purposes, for creating newcollective works,orforresale. Paperspublished priorto1978mayalsobecopiedataperpaperfeeof$2.50 undertheabovestatedconditions. SAEroutinely stocksprintedpapersforaperiodofthreeyearsfollowing dateof publication. DirectyourorderstoSAEOrderDepartment. Toobtainquantityreprintrates,permission toreprintatechnical paperorper­ missiontousecopyrighted SAEpublications inotherworks,contacttheSAE Publications Division. ISSN0148·7191 Copyright 01980SocietyofAutomotive Engineers. Inc.Downloaded from SAE International by University of Leeds, Monday, August 13, 2018800669 TheCLBT9680 anAutomatic Transmission forOff-highway Vehicles J.R.ALLENandJ.P.CORNET DetroitDieselAllison DivisionofGeneralMotorsCorporation Fig.1-Offhighway transmission applicationsOilfiELDRIGOFFHIGHWAY TRANSMISSION APPLICATIONS REARDUM?TRUCKASIX-SPEED AUTOMATIC TRANSMISSION for largehaulingvehicleshasbeenproduced byDetroit DieselAllisonsince1972.TheDP8961transmission hasbeenusedinrearandbottom-dump trucks(Fi­ gure1)withenginesupto783kW(1050ghp),andin specialpm'poseinstallations withenginesupto895 kW(1200ghp).Sinceitsintroduction, theDP8961has gainedwidespread acceptance asareliable compo­ nentofamechanical-drive system.Inrecentyears, mechanical-drive truckshavegainedfavorover electrical-drive trucks(Figure 2)foravarietyof reasons. Theseinclude: •greaterstartability •improved gradeability athighspeeds •greateroverallvehicleretarding capability •greatercontinuous coolingcapacity ABSTRACT Inthepastfewyears,enginepowerratingshave steadilyincreased. Tomeetthedemandofengineand vehiclemanufacturers foratransmission tomatch theselargerengines,DetroitDieselAllisondeveloped theCLBT9680 transmission. Thistransmission has beendesigued anddeveloped tooperateinrear-dump bucksupto127tonne(140-ton) capacity, andinbot­ tom-orside-dump trucksupto154tonne(170-ton) capacity.Intheseapplications theCLBT9680 hasapowerratingupto1007kW(1350ghp).Thetransmis­ sion can alsobeapproved withengines ratedupto 1093kW(1465ghp)inspecialpm,!,oseinstallations suchasoilfieldserviceequipment. Inthispaperthetransmission desiguandtestde­ velopment programs arepresented. Inaddition, the extensive development programs arediscussed rela~ tivetoperformance andreliability goalsforthe transmission. 0148·7191/80/0414.0669$02.50 Copyright ©1980SocietyofAutomotive Engineers, Inc.Downloaded from SAE International by University of Leeds, Monday, August 13, 20182 lowerfuelconsumption lowerinitialcost lowermaintenance cost "" """%"PENETRATION "." "'" "MECHANICAL \ I ELECTRICINPUTRATINGS TheCLBT9680 hasbeendesigned tooperatein dumptruckswithenginesupto1007kW(1350ghp). Netinputratingsareasfollows: •torque4881N.m(3600Ib.fU •speed2100rpm •power933kW(1250hpj Forspecialpurposeinstallations theCLBT9680 can beapproved foroperation withenginesupto1093kW (1465ghp).Netinputratingsfortheseapplications are: YEARS•torque5423N.m(4000lb.ft.) •speed2100rpm •power1018kW(1365hpj Fig.2-Transmission usageinNorthAmerican rear dumptrucks-70-100tons(63-90tonne)TRANSMISSION DESIGN Inthepastfewyearsenginepowerratingshave steadily increased duetotheuprating ofew'rentpro­ duction engin