Dual Mass Flywheel - A Better Driving Experience By .
International Conference on Global Trends in Engineering, Technology and Management (ICGTETM-2016)Dual Mass Flywheel - A Better Driving Experience byReducing VibrationDattatray B. Vaitkar1P.N.Ulhe 2(M.E. Student)(Asst. Professor)Mechanical Engineering Department, SSBT’s College Of Engineering, Bambhori,North MaharashtraUniversity, India.Abstract— The dual mass flywheel (DMF) can createan improved driving experience for manual shiftvehicles. Vibrations and noises that occur duringvehicle operation are absorbed. Fuel consumption isreduced. This results in economical drivingcomfort.Dual mass flywheel is a multi-clutch devicewhich is used to dampen vibration that occurs due tothe slight twist in the crankshaft during the powerstroke .When the power stroke subsides, the crankshaftuntwists. One wouldn't think a crankshaft would twistto any significance, but any piece of metal alwaysdeflects a little when a force is applied to it. The ratethat these vibrations occur is referred to as thetorsional frequency. Transaxles experience torsionalvibrations also. When torsional frequencies of thecrankshaft match those of the transaxle an effectknown as torsional resonance occurs, which maycause excessive wear on the drivetrain components.Keywords — DMF,Multi-clutch,Damper, Drivetrain.1.INTRODUCTIONThe dual mass flywheel (DMF) can create animproved driving experience for manual shiftvehicles.The main function of the dual mass flywheelis to absorb engine vibrations before they aretransmitted to the driveline, where they may creategear rattle or excessive wear. To achieve this, theconventional flywheel is divided into two sections.The primary section is attached to the crankshaft. Theprimary and secondary sections are connected throughsprings to isolate engine vibrations from beingtransmitted to the transmission. The clutch is boltedonto the secondary section of the flywheel.1.2 Why to Use Dual Mass FlywheelThe periodic combustion cycles of a 4-strokeengine create torque fluctuations which causestorsional vibration to be passed down the drivetrain.The resulting noise and vibration, such as gear rattle,body boom and load change vibration, results in atorsional vibration caused by the engine’s rotatingmass. Owing to its integral spring/damper system, theDMF almost entirely absorbs this torsional vibration.The result: very good vibration damping.Crankshaft torsional vibration occurs because eachpower stroke tends to slightly twist the crankshaft.When the power stroke subsides, the crankshaftuntwists. One wouldn't think a crankshaft would twistto any significance, but any piece of metal alwaysdeflects a little when a force is applied to it. The ratethat these vibrations occur is referred to as l vibrations also. When torsional frequenciesof the crankshaft match those of the transaxle an effectknown as torsional resonance occurs, which maycause excessive wear on the drivetrain components.2. Advantages of DMF over CFHAVING TWO DIFFERENT MASSES; TWODIFFERENT SECTIONS, ISOLATES VIBRATION INTHECRANKSHAFT FROM PASSING ON TO THESECOND MASS TO SOME EXTENT.THEREBYPREVENTINGUNDESIRABLEVIBRATIONS IN THE GEAR BOX, THEREUPONPREVENTING GEARRATTLEIMMEDIATE REACT TO INCREASED LOADAMPLITUDEDUE TO THE EXISTENCE OF AMEDIUM IN DMF, BETWEEN PRIMARY ANDSECONDARYMASS; AND CONFIGURATION OFTHROTTLE GEOMETRY DMF CAN BE ADAPTEDTO DIFFERENTREQUIREMENTS BETTER THANCFSdecrease in both cabin and driving comfort. Theobjective when developing the DMF was therefore toisolate as much of the drivetrain as possible from theISSN: 2231-5381http://www.ijettjournal.orgPage 111
International Conference on Global Trends in Engineering, Technology and Management (ICGTETM-2016)3.1.3 BearingLarge and small ball bearing: The primary mass isfitted with a turned hub on which the large-size ballbearing is fitted.3.1.4 FlangeThe task of the flange is to transfer torque from theprimary mass via the arc springs to the secondaryflywheel; in other words, from the engine to the clutch.Fig.1 CF (SMF) VS DMF3.1.5 Friction control discDuring the start-up process, the DMF operates briefly3. Dual Mass Flywheel (DMF)The Dual Mass Flywheel (DMF) is installedbetween the engine and the transmission along within the resonant frequency range.3.1.6 Arc springsThe arc spring does the function of damper. The arcthe clutch cover and clutch disc.3.1Structure of Dual Mass Flywheelspring is also called as a heart of DMF.The materialused for arc spring is60Si2MnAspringsteelFig.2AStructure of Dual Mass Flywheel3.1.1 Primary MassThe primary mass or flywheel is connected to thecrankshaft of the engine.Fig.4 Arc Spring with Different Stiffness3.1.2 Secondary Mass3.2 Materials and Properties of Arc SprinThe engine torque is transferred from the primarymass to the secondary mass via the arc springs and theThe material used in this investigation is 60Si2MnAspring steel;flange.T Table.1 Design Parameters of Arc SpringFig. 3 Structure of Dual Mass FlywheelISSN: 2231-5381http://www.ijettjournal.orgPage 112
International Conference on Global Trends in Engineering, Technology and Management (ICGTETM-2016)highercomfortarefullymet.Table.2 Material property of 60Si2MnA4. Working Principle of Dual Mass FlywheelThe functioning principle of a DMF is simple, yetefficient. Owing to the additional mass on thetransmission input shaft, the vibration torque range,Fig.6 Transfer of Torsional Vibrations in DMFAs shown in fig.6 the engine vibrations are reducedbefore they are transmitted to the driveline.which is normally between 1,200 rpm and 2,400 rpmwith original torsion dampers, is moved to a lowerresonance speed range. This ensures excellentdamping of engine vibration even at idle speed.Fig.7 Working Principle of Dual Mass Flywheel4.1 With and without Dual Mass FlywheelFig 5. Working Principle of Dual Mass Flywheel1 Engine2 Clutch3 Transmission4 Torsion dampers5 Primary mass6 Secondary mass7 FlywheelThe spring/damper system of the DMF filters outthe torsional vibrationsinduced by the engine as far astorsional vibration caused by the engine. This preventspossible from the rest of the drive train. Agearbox components knocking against each other –conventional system only satisfies this requirement atrattling does not occur and the driver’s demands forhigh engine speed, because the attainable torsionFig.8 Dual Mass Flywheel ArrangementThe goal of torsion damper development is to keepdamper spring rates lead to naturalfrequencies whichare always within the normal driving range.Thisunsatisfactory situation led to the development of anew torsiondamper concept - the dual mass flywheel(DMFW). This design shifts partof the flywheelinertia to the transmission input shaft and drasticallylowersthe torsion damper spring rate by introducingISSN: 2231-5381http://www.ijettjournal.orgPage 113
International Conference on Global Trends in Engineering, Technology and Management (ICGTETM-2016)new spring designs (Figure5.5), thus reducing theDifferent compression pressures in variousresonance speed to very low engine speeds.cylinders.5. Advantages of Dual Mass FlywheelExtreme vibration due to worn drivetrainElimination of gear rattlecomponentsReduced drivetrain noise6.1 Applications of Dual Mass FlywheelThe DMF is used in luxury cars such as Ferrari 458,Reduced shifting frequencyLess synchronizer wearJaguar XJ, Audi A3 2.0TDI 140 etc.Lower engine operating speeds save fuel and reducedConclusionemissionsIn this way the use of Dual Mass Flywheel with theLess drivetrain torque fluctuationLess axial vibrationsutilization of Damping System we can say that theLong service lifeDMF gives the new way of driving experience bylowering the vibration and used in the most of theSmooth start/stop performanceOutstanding vibration damping throughout the entirerecent Cars. A vehicle with a DMFW offers increasedfuel economy if the following conditions are met.rpm rangeThe vehicle manufacturer reduces idle speed.5.1Disadvantages of Dual Mass FlywheelThe driver adopts economical driving habits byHard to testdriving in higher gears at lower engine speeds both ofImpossible to machinethese factors can be achieved without loss of drivingCostlycomfort. The compact DMFWs offer full dual-mass5.2An Experimental Case-Studyflywheel function and, therefore, improved noiseAn experimental case-study on Dual Mass flywheelgives the following results at different load condition.This is shown in tabulated form as 077125control for the customer; with only minimal costincreases when compared to conventional systems.ACKNOWLEGEMENTI sincearly thanks to my guide Assi.Prof. P.N.Ulhesir (SSBT’S College of Engg. Bambori Jalgaon.).Who encourage me continuously for this conference.At last I thanks to Michael Shell and othercontributors for developing and maintaining the IJETTLaTeX style files which have been used in thepreparation of this template.REFERENCES[1][2]6. Possible Causes of Failure of Dual Mass[3]FlywheelFrequent stalling of the engine / driving at[4]extremely low engine speeds.[5]ISSN: 2231-5381A Textbook of Theory of Machines by R. S. Khurmi and J. K.Gupta – Torsional Vibrations (Page no. 972)A Textbook of Machine Design by R. S. Khurmi and J. K.Gupta – Flywheel (Page no. 776)Dr.-Ing. Albert Albers,: Advanced Development of Dual MassFlywheel (DMFW) Design - Noise Control for Today'sAutomobilesZF Services GmbH Obere Weiden 12 · 97424 Schweinfurt ·Germany Borgwardstr. 16 · 28279 Bremen · GermanyGovinda and Dr. Annamalai, K:VIT University, Chennai,India,: International Journal of Engineering & TechnologyResearch Volume1, January February www.iaster.com, ISSNhttp://www.ijettjournal.orgPage 114
International Conference on Global Trends in Engineering, Technology and Management (ICGTETM-2016)[6][7][8]Online: 2347, 2014, pp. 3 54 1 , IASTER 2014 4904:Design and Analysis of Arc Springs used in Dual MassFlywheelSameer More, Pravin Medankar, Prof.Mahesh Nagargoje:International Journal of Innovative Research in Science,Engineering and Technology Vol. 4, Issue 3, March 2015 Design and Development of Dual Mass Flywheel SystemPayam Bighal: High Efficiency Heavy Duty Truck Engine Advantages of DMF over CFSchaeffler Automotive Aftermarket GmbH & Co. KGSeptember 2013 - Dual Mass Flywheel TechnologyISSN: 2231-5381http://www.ijettjournal.orgPage 115
The dual mass flywheel (DMF) can create an improved driving experience for manual shift vehicles.The main function of the dual mass flywheel is to absorb engine vibrations before they are transmitted to the driveline, where they may c
Fig.5.Dual Mass Flywheel System The dual mass flywheel system is as shown above. The flywheel comprises of the flywheel hub which is keyed to the engine shaft,. Hub carries the flywheel body, on which the flywheel gear
A dual mass flywheel consists of two flywheels connected by a low stiffness torsional spring package. By exchanging the standard flywheel with a dual mass flywheel, the resonance modes of the system are affected. The properties of the dual mass flywheel can be selected so that the
of conventional flywheel and compact flywheel using inertia augmentation mechanisms. A. Trial on Conventional Flywheel and Compact Flywheel Engine Speed 1300 rpm Engine Power 205 watt Radius of dyno- brake pulley 0.032 m Table 1 Observation Table of Conventional Flywheel Sr
Dual Mass flywheel which is currently being implemented in Volvo Trucks. Alternate concepts includes Powersplit flywheel, Centrifugal Pendulum Vibration Absorber flywheel, and Triple Mass flywheel. Key words: NVH,
dual mass flywheel is a constant for a certain type of engine. The inertias of the primary and secondary flywheel assembly and the multi-stage torsional stiffness need to be reasonably determined in the process of matching
dual mass flywheel mated to a non-damped clutch disc, and a self adjusting pressure plate that maintains pedal feel and free play as the clutch wears. Once we remove the original components, we’ll bolt up our lightweight single mass flywheel, followed up by a new sp
dual mass flywheel with a solid flywheel, you will dramatically increase reliability but you will develop a transmission growl at low RPM. The growl is noticeable below 1500 RPMs on my truck, but manageable. The clutch disk resides between the flywheel a
23. Sharma, P. D. [1991] : The Fungi (Rastogi & Co. Meerut) 24. Vasishta, B. R. [1990] : Fungi (S. Chand & Co. New Delhi) 25. Sharma, O. P. : Fungi (TMH)
