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185:
283:, one inside the other, but the internal arc spring is shorter so that it acts later. The characteristic curve of the outer arc spring is adapted to increase when the engine is started. The softer outer arc spring only acts to increase the problematic resonance frequency range. When the torque increases, reaching the maximum value, the internal arc spring also acts. In this second phase, the inner and outer arc springs work together. The collaboration of both arc springs thus ensures good acoustic isolation at all engine speeds.
32:
213:
203:
The absorption capacity of the vibration depends on the moving parts of the DMF, these parts are subject to wear. Whenever the clutch is replaced, the DMF should be checked for wear. The two key wear characteristics are freeplay and sideplay (rock). These should be measured to determine whether the
195:
Dual-mass flywheels were developed to address the escalation of torque and power, especially at low revs. The growing concern for the environment and the adoption of more stringent regulations have marked the development of more efficient new engines, lowering the cylinder number to 3 or even 2
295:
consists of an outer and two inner arc springs with different elastic characteristics connected in series. This category of bent spring uses the two concepts together: parallel and series connection in order to ensure optimal torsional compensation for each value of torque.
258:
are called parallel springs of one phase. These consist of an outer and an inner arc spring of almost equal lengths and connected in parallel. The individual characteristic curves of the two arc springs are added to form the characteristic curve of the spring pair.
234:. The planetary gear and the torsional damper are incorporated into the main flywheel. For this purpose, the main flywheel is divided into primary and secondary pinion-connected masses, and between them there are four different types of bent springs:
204:
flywheel is serviceable. The wear limit specifications can be found in vehicle or flywheel manufacturer's published documentation. Other failure modes are severely grooved/damaged clutch mating surface, grease loss, and cracking.
164:
or revolutions that could cause an unwanted vibration. The vibration reduction is achieved by accumulating stored energy in the two flywheel half masses over a period of time but damped by
377:
168:, doing that at a rate that is compatible with the energy source, and then releasing that energy at a much higher rate over a relatively short time. A compact dual-mass
196:
cylinders, and allowing the delivery of more torque and power at low revolutions. The counterpart has been an increase in the level of vibration which traditional
350:
425:
1087:
200:
discs are unable to absorb. This is where the dual-mass flywheels play a key role, making these mechanical developments more viable.
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96:
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932:
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610:
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8:
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615:
152:) in systems where the energy source is not continuous, the same way as a conventional
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658:
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403:
148:) is a rotating mechanical device that is used to provide continuous energy (
191:
torque converter with a pendulum absorber using the same DMF's bent springs.
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673:
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455:
16:
Device used to smooth and dampen abrupt changes in rotational speed/torque
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supported by a sliding shell in a torque-angle characteristic curve.
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20:
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844:
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600:
550:
310:
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173:
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In the case of two-stage spring there are two curved parallel
242:
The simplest form of the bent spring is the standard single
998:
445:
271:
Representation of the friction hysteresis of a two-stage
212:
176:, including the pressure plate and the friction disc.
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249:
56:. Unsourced material may be challenged and removed.
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433:
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116:Learn how and when to remove this message
492:Crankcase ventilation system (PCV valve)
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211:
183:
127:
1075:
407:
1088:Automotive transmission technologies
54:adding citations to reliable sources
25:
13:
263:Two-phase bent springs in parallel
250:One-phase bent springs in parallel
14:
1099:
386:
226:Blue: flywheel, transmission side
216:Principle of dual-mass flywheel.
30:
594:Overhead valve (pushrod) layout
41:needs additional citations for
343:
224:Red: flywheel, crankshaft side
1:
336:
306:Centrifugal pendulum absorber
7:
299:
10:
1104:
435:Internal combustion engine
331:List of moments of inertia
230:The main type is called a
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132:Dual-mass flywheel section
18:
1052:
1016:
976:
931:
903:Diesel particulate filter
888:
855:Idle air control actuator
837:
804:
796:Engine control unit (ECU)
786:
733:
687:
649:
569:
454:
441:
172:often includes the whole
160:any violent variation of
968:Viscous fan (fan clutch)
880:Throttle position sensor
589:Overhead camshaft layout
207:
507:Core plug (freeze plug)
321:Flywheel energy storage
287:Three-phase bent spring
276:
238:Individual bent spring
227:
192:
133:
270:
215:
187:
131:
748:Compression ignition
65:"Dual-mass flywheel"
50:improve this article
19:For other uses, see
898:Catalytic converter
1024:Knocking / pinging
616:Combustion chamber
394:dual-mass flywheel
277:
228:
193:
138:dual-mass flywheel
134:
1070:
1069:
1039:Stratified charge
806:Electrical system
788:Engine management
621:Compression ratio
561:Starter ring gear
460:rotating assembly
326:Harmonic balancer
150:rotational energy
126:
125:
118:
100:
1095:
913:Exhaust manifold
778:Spark plug wires
664:Boost controller
651:Forced induction
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353:. Archived from
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601:Tappet / lifter
584:Flathead layout
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933:Cooling system
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890:Exhaust system
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860:Inlet manifold
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715:Fuel injection
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482:Connecting rod
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387:External links
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946:Water cooling
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923:Oxygen sensor
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838:Intake system
836:
830:
829:Starter motor
827:
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822:
820:
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815:
812:
811:
809:
803:
797:
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785:
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769:
768:Ignition coil
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700:Petrol engine
698:
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695:Diesel engine
693:
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659:Blowoff valve
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576:Cylinder head
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467:Balance shaft
465:
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457:
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357:on 2016-11-04
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293:curved spring
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254:The standard
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232:planetary DMF
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77:
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70:
67: –
66:
62:
61:Find sources:
55:
51:
45:
44:
39:This article
37:
33:
28:
27:
22:
953:Electric fan
753:Coil-on-plug
679:Turbocharger
674:Supercharger
546:Main bearing
536:Firing order
526:Displacement
472:Block heater
456:Engine block
444:Part of the
443:
400:
393:
378:LUK Symposia
359:. Retrieved
355:the original
345:
290:
278:
253:
241:
231:
229:
202:
194:
145:
141:
137:
135:
112:
103:
93:
86:
79:
72:
60:
48:Please help
43:verification
40:
977:Lubrication
941:Air cooling
758:Distributor
710:Fuel filter
688:Fuel system
669:Intercooler
636:Timing belt
626:Head gasket
556:Piston ring
351:"Luk DMF's"
281:arc springs
256:arc springs
220:arc springs
166:arc springs
106:August 2018
1077:Categories
1029:Power band
989:Oil filter
963:Thermostat
908:EGT sensor
870:MAF sensor
865:MAP sensor
850:Air filter
814:Alternator
773:Spark plug
705:Carburetor
631:Rocker arm
571:Valvetrain
502:Crankshaft
446:Automobile
361:2015-01-11
337:References
273:arc spring
244:arc spring
189:Schaeffler
156:acts, but
76:newspapers
1083:Flywheels
763:Glow plug
725:Fuel tank
720:Fuel pump
487:Crankcase
1062:Category
1007:Dry sump
1003:Wet sump
994:Oil pump
958:Radiator
875:Throttle
735:Ignition
606:Camshaft
531:Flywheel
512:Cylinder
497:Crankpin
316:Flywheel
300:See also
170:flywheel
154:flywheel
21:Flywheel
1034:Redline
918:Muffler
819:Battery
743:Magneto
218:Black:
180:History
158:damping
90:scholar
1057:Portal
845:Airbox
824:Dynamo
551:Piston
541:Stroke
520:layout
448:series
311:Clutch
198:clutch
174:clutch
162:torque
92:
85:
78:
71:
63:
1017:Other
641:Valve
611:Chest
291:This
208:Types
97:JSTOR
83:books
999:Sump
516:bank
477:Bore
146:DMFW
69:news
984:Oil
573:and
458:and
144:or
142:DMF
52:by
1079::
1005:,
518:,
370:^
246:.
222:.
136:A
1009:)
1001:(
522:)
514:(
427:e
420:t
413:v
397:.
364:.
140:(
119:)
113:(
108:)
104:(
94:·
87:·
80:·
73:·
46:.
23:.
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