Catalytic muffler having crossover passageway for secondary air
AssigneeBriggs & Stratton Corporation
InventorsDavid Duch, Gary Gracyalny, John Thiermann
Life of this patent
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Abstract
A catalytic muffler that treats the exhaust gases of an internal combustion engine. The catalytic muffler includes a catalyst chamber, a catalyst disposed in the catalyst chamber, an upstream chamber disposed upstream of the catalyst, an exhaust inlet configured to receive exhaust gases, an exhaust outlet configured to discharge converted gases converted by the catalyst to the atmosphere, and further configured to receive secondary air, and a passageway communicating between the exhaust outlet and the upstream chamber, and configured to provide the secondary air received by the exhaust outlet to the upstream chamber.
Claims21
A catalytic muffler that treats the exhaust gases of an internal combustion engine, the catalytic muffler comprising:
- a catalyst chamber;
- a catalyst disposed in the catalyst chamber;
- an upstream chamber disposed upstream of the catalyst;
- an exhaust inlet configured to receive exhaust gases;
- an exhaust outlet configured to discharge converted gases converted by said catalyst to the atmosphere;
- a muffler chamber positioned downstream of the catalyst chamber, the converted gases passing through the muffler chamber prior to being discharged from the exhaust outlet;
- and
- a passageway communicating the muffler chamber and the upstream chamber through which secondary air passing through the muffler chamber is provided to the upstream chamber.
Dependencies are inferred from the claim text.