Gas noise attenuation device for internal combustion engine of motor vehicle, has outer tube defining closed chamber with conduit and comprising wall not parallel to wall of conduit on section of length of chamber

摘要

The device has a conduit (2) surrounded, on a section of its length, by an outer tube (3) closed at its ends. The tube defines with the conduit a closed chamber which communicates with the conduit through openings (6). The tube has a wall that is not parallel to a wall of the conduit on a section of length of the chamber, where distance between the conduit and the tube varies between 1 to 2 centimeters.