Exhaust gas muffler for the combustion engine of a portable working tool

US6041890A · kind A · utility

Assignee

• Andreas Stihl AG & Co. KG · DE

Inventors

• Gunter Wolf · Eberdingen, DE
• Johannes Menzel · Oberhausen, DE

Key dates

• Filing date: Mar 26, 1999
• Grant date: Mar 28, 2000
• Expiry date: Mar 26, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S173/02
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

An exhaust gas muffler for an internal combustion engine of a portable, hand-guided working tool has a housing having an exhaust gas inlet, and exhaust gas outlet, and an outlet space, wherein the exhaust gas outlet opens into the outlet space. An outlet opening is provided downstream of the outlet space and has wall elements directing the exhaust gas flow in the exit flow direction. A rebound wall is positioned transverse to the exhaust gas outlet and delimits the outlet space while providing a connecting slot into the outlet opening. The connecting slot is spaced at a distance from the outer wall of the housing that extends substantially parallel to the rebound wall. A first ramp is positioned perpendicularly to the connecting slot and slants upwardly from the rebound wall to the outlet opening. A second ramp extends in a direction of longitudinal extension of the connecting slot from an end of the insertion slot opposite the first ramp to the edge of the first ramp opposite the connecting slot.