Hand-guided working tool such as a trimmer, motor chainsaw, or cutter with an internal combustion engine with an air intake blower

US6062177A · kind A · utility

Assignee

• Andreas Stihl AG & Co. KG · DE

Inventors

• Georg Becker · Schwaikheim, DE
• Hans-Georg Wiedmann · Backnang, DE
• Dieter Angstenberger · Leutenbach, DE

Key dates

• Filing date: May 9, 1997
• Grant date: May 16, 2000
• Expiry date: May 9, 2017

Classification

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

Abstract

A hand-guided working tool has a housing and an internal combustion engine arranged in the housing. The internal combustion engine has a cylinder, a crankshaft, and a crankcase enclosing the crankshaft. An air filter box including an air filter element is connected to the internal combustion engine. A tool is driven by the crankshaft. The housing has a blower chamber with a cooling air inlet, at least one combustion air inlet, and a combustion air outlet. A combustion air channel connects the combustion air outlet to the air filter box. A blower, driven by the crank shaft and arranged in the blower chamber, is provided for taking in cooling air through the cooling air inlet and supplying the cooling air to the internal combustion engine and for taking in combustion air through the at least one combustion air inlet and guiding the combustion air through the combustion air outlet, the combustion air channel, and the air filter box to the internal combustion engine. The blower includes a first blower wheel for conveying cooling air and a second blower wheel for conveying combustion air.