Catalytic muffler having crossover passageway for secondary air

US8136350B2 · kind B2 · utility

Assignee

• Briggs & Stratton, LLC · US

Inventors

• David Duch · Cary, US
• Gary J. Gracyalny · Elm Grove, US
• John H. Thiermann · Milwaukee, US

Key dates

• Filing date: May 28, 2008
• Grant date: Mar 20, 2012
• Expiry date: Jan 2, 2031

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01N2590/06
• WIPO field: Environmental technology
• WIPO sector: Chemistry

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.