Patent ID: 9374632
Filing Date: 2016-06-21
CPC Classification: F01N,F02M,G10K,H04R

Claim Text:
1. A sound generator for an anti-noise system for influencing sound waves propagating in exhaust systems or intake systems of vehicles driven by an internal combustion engine, the sound generator comprising: an enclosure having a port opening for a fluid communication with an exhaust system or an intake system; a loudspeaker basket supported by the enclosure; a permanent magnet supported by the loudspeaker basket; a voice coil supported by a voice coil carrier, the voice coil being disposed in a constant magnetic field created by the permanent magnet; a membrane supported by the loudspeaker basket and connected to the voice coil, the membrane being located between the port opening of the enclosure and the permanent magnet, the membrane having an axial extent from a membrane base to a membrane top, and having a base radial dimension that is larger than a top radial dimension with the membrane top being spaced away, in an axial direction, from the permanent magnet a greater distance than the membrane base; and a bell mouth mounted to the enclosure at the position of the port opening, wherein the bell mouth is connectable, via the port opening, to the exhaust system or intake system, wherein the loudspeaker basket is supported by the enclosure via the bell mouth such that the membrane top is located within the bell mouth.