Active exhaust muffler

Details Active exhaust muffler Active exhaust muffler

2007-11-13

2007-11-13

San Martin, Edgardo (Department: 2837)

Acoustics

Sound-modifying means

By wave interference

C181S250000, C181S272000, C181S273000, C181S276000, C381S071500, C381S071700

Reexamination Certificate

active

11205753

ABSTRACT:
An active exhaust muffler for an exhaust system of an internal combustion engine, having a housing through which a pipe system passes, the pipe system designed to be permeable for airborne sound in a first space, having an antisound generator which is arranged in a second space and antisound acting upon a third space through a wall opening during operation, the wall opening being provided in a partition that separates the second space from the third space, whereby airborne sound is transmitted from the first space to the third space through a sound outlet. To increase the lifetime of the antisound generator and thus the exhaust muffler, a labyrinth is provided in the third space, blocking a direct path between the sound outlet and the wall opening, and providing at least one indirect bypass for the propagation of airborne sound between the sound outlet and the wall opening.

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