Patent ID: 6382348
Filing Date: 2002-05-07
Classification: F01N

Abstract:
A twin muffler comprising a manifold adapted to receive exhaust gas from an engine, and two muffling units connected in parallel to said manifold and adapted to soften sound of exhaust gas passing through said manifold, said muffling units each comprising a front partition board defining a front accumulation chamber connected to said manifold to receive exhaust gas, a rear partition board defining a rear accumulation chamber, a rear exhaust port for guiding out exhaust gas accumulated in said rear accumulation chamber, a perforated inner tube connected between said front partition board and said rear partition board for guiding exhaust gas from said front accumulation chamber to said rear accumulation chamber, said perforated inner tube comprising a twisted middle section and a plurality of muffling holes distributed over the periphery thereof beyond said twisted middle section, a guide tube connected to said rear partition board and said perforated inner tube and adapted to guide exhaust gas from said perforated inner tube to said rear accumulation chamber, said guide tube having a diameter gradually reduced from said perforated inner tube toward said rear accumulation chamber, and a formed material stuffed around said perforated inner tube between said front partition board and said rear partition board.