Hand-guided appliance with an internal combustion engine with direct electronic injection

US6082312A · kind A · utility

Assignee

• DOLMAR GmbH · DE

Inventors

• Andreas Singer · Werdau, DE
• Jochen Schoenhaar · Hamburg, DE
• Klaus Matthees · Freiberg, DE
• Walter Siepmann · Warstein, DE
• Peter Schulz · Tettnang, DE
• Uwe Mehlhose · Chemnitz, DE

Key dates

• Filing date: Mar 8, 1999
• Grant date: Jul 4, 2000
• Expiry date: Mar 8, 2019

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B2075/025
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a manually operated machine such as a chain saw or the like, an internal combustion engine (10) located in a housing (17) and having an associated fuel injection mechanism (70) and an electro-mechanical module (80) is used to drive the machine. The engine (10) is a two-cycle one having a fuel container (140) arranged in or on the housing (17). The fuel injection mechanism in addition to the fuel container includes an injection valve (20) and a connecting tube (21) connecting the fuel container with the valve. For the connection between the outlet (22) of the injection valve (20) and the engine (10), a capillary tube (27) is used whose cross-sectional diameter is at maximum five times the cross-sectional diameter of the outlet of the injection valve, and the capillary tube is formed into the shape of a spring with its outlet opening directed into the engine block. The electro-mechanical module (80) contains means (25) for producing the drive voltage and a control circuit (26) with which the injection valve (20) is electrically connected.