Patent ID: 6116377
Filing Date: 2000-09-12
Classification: F01N

Abstract:
A sound attenuation device for the exhaust passageway of an internal combustion engine, comprising:a tubular core having an inlet end, an outlet end, and a passageway extending through the inlet and outlet ends; andan apertured flange extending transversely outwardly from the core between the inlet and outlet ends for engaging the exhaust passageway, creating an annulus between the core and the exhaust passageway, and defining an entrance zone surrounding the inlet end of the core and a discharge zone surrounding the outlet end of the core, the flange holding the core so that the inlet end of the core extends away from the flange into the entrance zone without contacting the exhaust passageway and exhaust from the engine is free to flow directly through the apertured flange into the discharge zone and directly through the core passageway into the discharge zone, and so that a portion of the exhaust flows from the entrance zone, through the apertured flange and annulus, and out of the attenuation device without entering the core passageway; and a portion of the exhaust flows from the entrance zone, into the core passageway, and out of the attenuation device without passing through the apertured flange.