Straight through type muffler for generating the exhaust flow from an internal combustion engine

摘要

A straight through type muffler for generating an exhaust flow from an internal combustion engine includes a closed expansion chamber in communication with the straight through passage of the muffler. A minority of the gases passing through the straight through passage will be accumulated in the expansion chamber and will be returned to the straight through passage when the pressure of the gases passing through the straight through passage is reduced, thereby minimizing the back pressure from the muffler.