User Guide

The primary mass is connected to the crankshaft of
the engine. The inertia of the primary mass and the
crankshaft combines to form a whole. Compared to a
conventional flywheel, the primary mass of the DMF is
significantly more flexible, which helps to relieve the
 DMF components
3 DMF components
For engine starting, the starter ring gear is positioned
on the primary mass. Depending on the type of DMF, it is
either welded or shrunk on.
1 Primary cover
2 Arc spring stop
3 Primary mass
1
2
3
1 Starter ring gear
2 Primary mass
1
2
. Primary mass
crankshaft load. In addition, the primary mass – together
with the primary cover – forms the arc spring channel
which is typically divided into two sections, separated
by the arc spring stops.