Hand-guided working tool such as a trimmer, motor chainsaw, or c

Details Hand-guided working tool such as a trimmer, motor chainsaw, or c Hand-guided working tool such as a trimmer, motor chainsaw, or c

1997-05-09

2000-05-16

Kamen, Noah P.

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

123 4163, F01P 700

Patent

active

06062177&

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.

REFERENCES:
patent: 3994067 (1976-11-01), Hazzard et al.

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