Patent ID: 7086498
Filing Date: 2006-08-08
Classification: F01N,Y02A

Abstract:
1. A noise attenuation device for a vehicle exhaust system, comprising: an exhaust pipe having a passageway for receiving exhaust gas pulses from an engine, said pipe having a discontinuity; a plurality of vanes extending from an inner surface of said exhaust pipe and spaced apart from one another and disposed upstream of said discontinuity of said exhaust pipe and substantially proximate to said discontinuity, said vanes being oriented generally parallel to a direction of flow of said exhaust gas pulses and configured to reduce turbulence in said exhaust gas pulses flowing past said vanes to reduce noise generated at said exhaust pipe discontinuity; and said passageway being substantially unobstructed in a proximity upstream of said vanes so that said flow is substantially unobstructed before impacting said vanes.