~A2!TheEngineering Society~ ForAdvancing Mobility~ LandSeaAirandSpace 400COMMONWEALTH DRIVEWARRENDALE, PA15096 870394 TheTwo=Mass Flywheel- ATors= ionalVibration Damper forthe PowerTrainofPassenger Cars­ StateoftheArtandFurther Technical Development ArnoSebulke Bayerische Moloren WerkeAG(BMW) International Congress andExposition Detroit.Michigan February23-27,1987Downloaded from SAE International by North Carolina State Univ, Wednesday, September 19, 2018Theappearance ofthecodeatthebollom 01thefirstpageofthispaperindicates SAE'sconsentthatcopiesofthepapermaybemadeforpers~na! orinternaluse,cr forthepersonal orinternaluseofspecificclients.Thisconsent isgivenonthecon· dition,however. thatthecopierpaythestatedperarliclecopyfeethrough the Copyright Clearance Center,Inc..Operations Center,P.O.Box765,Schenectady, N.Y.12301,forcopying beyondthatpermitted bySections 107or108oftheU.s. Copyright Law.Thisconsent doesnotextendtootherkindsofcopying suchas copying forge'neral distribution, foradvertising orpromotional purposes, for creating newcollective works,orforresale. Paperspublished priorto1978mayalsobecopiedataperpaperfeeof$2,50 undertheabovestatedconditions. SAEroutinely stocksprintedpapersforaperiodofthreeyearsfollowing dateof publication. DirectyourorderstoSAEOrdRrDepartment. Toobtainquantity reprintrates,permission toreprintatechnical paperorper· mission tousecopyrighted SAEpublications inotherworks.contact theSAE Publications Division. AllSAt'p;:pr"aN;abmaclrJ and'ndrxrti ittIh~SAt'GI"balMobll<rr DalabaJr SAEGLOBAL MOBILITY DATABASE Nopartofthispublication maybereproduced inanyform,in anelectronic retrievalsystemorotherwise, withoultheprior writtenpermission ofthepublisher. ISSNOI48· 7191 Copyright ©1987SocietyofAutomotive Engineers, Inc. Thispaperissubjecttorevision. Statemer1ts andopinions ad­ vancedinpapersordiscussion aretheauthor's andarchis responsibility. notSAE's;however. thepaperhasbeenedited bySAEforuniform stylingandformat.Discussion willbe printedwiththepaperifitispublished inSAETransactions. Forpermission topublishthispaperinfuUorinpart.contact theSAEPublications Division.Personswishing.tosubmitpaperstobeconsidered forpre­ sentation orpublication throughSAEshouldsendthemanu­ scriptora300word a~stractofaproposed manuscript to: Secretary. Engineering Activity Board.SAE. PrintedinU,S.A,Downloaded from SAE International by North Carolina State Univ, Wednesday, September 19, 2018870394 TheTwo-Mass Flywheel -ATor­ sionalVibration Damperforthe PowerTrainofPassenger Cars­ StateoftheArtandFurther Technical Development ArnoSebulke Bayerische Motoren WerkeAG(BMW) A~srHACT fherotational irregularities ofanengine, whichareprimarily causedbytheforcesgenera­ tedbythecombustion gasesduringtheperiodic combustion process, aretransmitted tothe driveline andthereleadtovibration andnoise. Since1985, BMWhasbeenusingitstwo-mass fly­ wheelan certain gasoline anddiesel engines. Thisisamechanical low-pass filter, which largely isolates rotational irregularities and vibration fromthecomplete drivelineandthere­ forereduces thenois8levelinsidethevehicle. Running speedssignificantly exceeding 5000rpm however causeasevereincrease inwearonthe internal components ofthetorsional vibration damper, asaconsequence ofthehighercentri­ .fugalforces. Foruseofthetwo-mass flywheel atveryhighengine speeds, moresatisfactory tribological conditions havetherefore tobe created. Closed systems filled withamedium withasimultaneous lUbricating anddamping effect arecurrently beinginvestigated, and testresults sofarhavebeenpromising. INTHEORIVELINE OFANAUTOMOBILE itispossible toidentify agreatmanymodesofvibration with differing frequencies andamplitudes, depending onload,speedandtheselected gearratio. On vehicles withaconventional driveline incorpo­ rating amanual gearbox, thetorsional vibra­ tionsofthesecond orthirdorderoriginating fromtheengine, inotherwordsthoserelated to theignition frequency offour-orsix-cylinder engines, areparticularly predominant anddis­ turbin