Cut-away model of an absorption silencer

Cut-away model of an
absorption silencer


Cut-away model of a baffled silencer

Cut-away model of a
baffled silencer


Cut-away model of a combination silencer

Cut-away model of a
combination silencer

Absorb sound.
Reflect sound.

Um das Abgasgeräusch zu dämpfen, stehen prinzipiell zwei Möglichkeiten zur Verfügung: Absorption und Reflexion des Schalls. Daraus haben sich in der Schalldämpfertechnik drei Bauweisen entwickelt.

Absorption silencer

The oldest silencer system still in use today absorbs the sound with the aid of insulating wool (basalt wool or glass wool). The sound energy “chafes” against the sound-absorbing materials and is converted into heat.

Due to the insulating effect of the absorbing materials the silencer remains relatively cold, which conduces to the formation of aggressive condensate. For this reason, rear silencers should not be built according to the absorption principle.

Baffled silencer

Reflecting walls retard the sound waves in this silencer type. The lengthier sojourn time in the silencer and the interplay with perforated tubes and restrictors result in a muffled exhaust gas flow.

Though baffled silencers control the sound, their design usually gives rise to areas of banked-up pressure where condensate can collect. Unfavourable flow conditions additionally have the effect that this condensate will evaporate only if temperatures are high enough.

Combination silencer

This silencer variant takes advantage of the damping properties of both systems.

But in addition to the favourable properties, it combines the specific drawbacks (in terms of corrosion) of the absorption and reflection methods.