Membrane carburetor

US6595500B2 · kind B2 · utility

Assignee

• Andreas Stihl AG & Co. KG · DE

Inventors

• Gerhard Osburg · Weingarten, DE
• Wolfgang Luithardt · Waiblingen, DE
• Peter Schmidt · Waiblingen, DE
• Reinhard Gerhardy · Bad Marienberg, DE

Key dates

• Filing date: Apr 23, 2002
• Grant date: Jul 22, 2003
• Expiry date: Apr 23, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S261/68
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A membrane carburetor for an internal combustion engine in a portable handheld work apparatus includes a control chamber (3) delimited by a membrane (2). The control chamber (3) is connected via a feed line (4) to a fuel tank (5). The feed line (4) is cleared via a valve body (6) when there is a deflection of the membrane (2) because of an underpressure in the control chamber (3). The control chamber (3) is connected to an air channel (10) via at least one fuel nozzle (7) and at least one ancillary chamber (9). The air channel (10) passes through the membrane carburetor (1) and leads to the internal combustion engine. A purge pump (11) is provided in a fuel line (12) connecting the control chamber (3) to the fuel tank (5). The fuel path between the control chamber (3) and the purge pump (11) is guided through at least one ancillary chamber (9).