16
Superior
Technology
Dual-mass flywheel
Due to irregularities in combustion, displacement
engines produce torsional vibrations at the
crankshaft and the flywheel.
The use of a dual-mass flywheel prevents these
torsional vibrations being transmitted into the
drive train where they would produce resonance,
resulting in disturbing noise in the boat. The
dual-mass flywheel therefore also avoids
excessive stress in the subsequently connected
gearbox.
The dual-mass flywheel divides the flywheel mass
into two parts.
One part is the primary flywheel or centrifugal
mass; it belongs to the mass moment of inertia of
the engine.
The other part, the secondary mass, increases the
mass moment of inertia of the drive.
Connected by means of a spring damping
system, both decoupled masses isolate the
vibrations.
They absorb the vibrations at low engine speeds
thus ensuring "drive rattle" no longer occurs.
Engine mechanical systems
MSSP_001_010
MSSP_001_063
Vibration insulation
Vibration damper
Crankshaft drive
Primary flywheel mass of
the dual-mass flywheel
Secondary flywheel mass
Summary of Contents for SDI 55-5
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