Exhaust muffler comprising a catalytic converter

US6393835B1 · kind B1 · utility

Assignee

• Andreas Stihl AG & Co. KG · DE

Inventors

• Gerhard Stoll · Winnenden, DE
• Wolf Burger · Eppelheim, DE
• Gustav Wölpert · Waiblingen, DE
• Thomas Rieger · Ingolstadt, DE
• Ronald Hotz · Neukirchen, DE
• Bernhard Durr · Stuttgart, DE

Key dates

• Filing date: Apr 6, 2001
• Grant date: May 28, 2002
• Expiry date: Apr 6, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B2075/027
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

The invention relates to an exhaust-gas muffler on an internal combustion engine in a motor chain saw. The exhaust-gas muffler includes a housing (1) which is assembled of two housing shells (2, 3). The one housing shell (2) has an exhaust-gas inlet (4) and the other housing shell (3) has an exhaust-gas outlet (5). An inner wall (8) as well as a catalytic converting element (7) are provided in the inner space (6) of the muffler housing (1). The catalytic converting element (7) is mounted between the exhaust-gas inlet (4) and the exhaust-gas outlet (5). In order to ensure an adequate catalytic converting treatment of the exhaust gas at low gas counterpressure, it is provided to divide the entering exhaust-gas flow (10) and to conduct at least one of these component flows (23) in contact with the catalytic converting element (7). The component flows (22, 23) are brought together and mixed with other before exiting from the muffler housing (1).