Patent · US Expired

Exhaust gas muffler for a two-stroke engine

US4867270A · kind A · utility

31Cited by

3References

28Claims

0Family size

Assignee

Andreas Stihl AG & Co. KG · DE

Inventors

Michael Wissmann · Markgröningen, DE
Jurgen Grassmuck · Stuttgart, DE
Wilfried Muller · Mannenberg, DE
Helmut Zimmermann · Winnenden, DE

Key dates

Filing date	Oct 17, 1988
Grant date	Sep 19, 1989
Priority date	—
Expiry date	Oct 17, 2008

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S55/30
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

The invention relates to an exhaust gas muffler for a two-stroke engine of a portable handheld tool such as a chain saw. The exhaust gas muffler includes a catalyzer wherein high exhaust gas temperatures are developed because of the exothermal reaction which takes place therein. The catalyzer is located in the forward portion of a gas-tight hollow body mounted in the housing of the muffler. The hollow body has a tapered portion which extends out of the housing in the direction of the exhaust gas flow. In this way, the surface temperature of the muffler housing is reduced.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.