Please Explain Dual Mass Flywheels
- Thread starter duwem
- Start date
Bob_Fout
Oil Wanker
NarfBLAST
Top Post Dawg
@duwem, Could you be more specific in your question?
Basically:
Single mass flywheels are Solid and rely on the clutch springs to dampen forces associated with engagement and loading between the engine and transmission. The problem with SMFs is that they are limited in the size of spring and dampening that can be achieved due to the construction of the clutch mechanism (springs can only be mounted in a narrow ring between the hub and friction material)
Dual mass dual mass flywheel have very large springs inside, much larger than any springs that could be fit into a clutch assembly, they may also have gears to multiply the dampening of the forces associated with engagement and loading between the engine and transmission. Since the dampening is done inside the flywheel there may be no springs at all on the clutch. The problem with DMFs is that they can have may moving parts inside a tight casing with grease that subjected to heat cycles and dust and eventually seize up or break causing hard engagement and vibrations.
This is a really good reference:
Clutch FAQ for VW and Audi TDI with DMF info ... - myturbodiesel
And this is a really good video, although it shows a simplified version of a dual mass flywheel, without the extra gears that VW uses, it shows the action of the spring in the flywheel:
3D animation of dual mass flywheel - YouTube
Basically:
Single mass flywheels are Solid and rely on the clutch springs to dampen forces associated with engagement and loading between the engine and transmission. The problem with SMFs is that they are limited in the size of spring and dampening that can be achieved due to the construction of the clutch mechanism (springs can only be mounted in a narrow ring between the hub and friction material)
Dual mass dual mass flywheel have very large springs inside, much larger than any springs that could be fit into a clutch assembly, they may also have gears to multiply the dampening of the forces associated with engagement and loading between the engine and transmission. Since the dampening is done inside the flywheel there may be no springs at all on the clutch. The problem with DMFs is that they can have may moving parts inside a tight casing with grease that subjected to heat cycles and dust and eventually seize up or break causing hard engagement and vibrations.
This is a really good reference:
Clutch FAQ for VW and Audi TDI with DMF info ... - myturbodiesel
And this is a really good video, although it shows a simplified version of a dual mass flywheel, without the extra gears that VW uses, it shows the action of the spring in the flywheel:
3D animation of dual mass flywheel - YouTube
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