Exhaust gas muffler for an internal combustion engine

US5315075A · kind A · utility

Assignee

• Andreas Stihl · DE

Inventors

• Wolfgang Junginger · Waiblingen, DE
• Matthias Rosler · Stuttgart, DE
• Thomas Rupp · Winnenden, DE

Key dates

• Filing date: Jan 26, 1989
• Grant date: May 24, 1994
• Expiry date: Jan 26, 2009

Classification

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

Abstract

The invention is directed to an exhaust gas muffler for an internal combustion engine such as a two-stroke engine for portable handheld tools such as a motor-driven chain saw. The engine includes a cylinder and a piston conjointly defining a combustion chamber wherein combustion gases are generated and discharged as a flow of exhaust gas during operation of the engine. The exhaust gas muffler includes a housing having a shell-like wall defining a chamber for receiving the exhaust gas from the engine. The housing has a primary outlet opening formed in the wall of the housing for passing a primary component flow of the exhaust gas out of the chamber in a first direction. The housing has a secondary outlet opening formed in the wall thereof for passing a secondary component flow of the exhaust gas out of the chamber in a second direction. A guide is provided at the secondary outlet opening for directing the secondary component flow toward and into the primary component flow to break up the latter and cause the same to become turbulent and mix with the cooler ambient air.