INTERNAL COMBUSTION ENGINE EXHAUST MUFFLER Russian patent published in 2001 - IPC

FIELD: mechanical engineering; exhaust systems. SUBSTANCE: proposed exhaust muffler has housing, three inner partitions forming, together with housing, four working chambers. Muffler has also intake, two intermediate perforated and outlet perforated pipes. Intake pipe connects first and second working chambers. First intermediate perforated pipe in installed on partition separating first and second working chambers. Second perforated pipe installed on first and second partitions connects first, second and third working chambers. Outlet perforated pipe connects thirds and fourth working chambers. Each working chamber has odd number of inlet and outlet holes in sum. EFFECT: reduced sound pressure of exhaust gases, cost of manufacture and labor input in production of exhaust mufflers. 2 cl, 1 dwg