Patent ID: 6062177
Filing Date: 2000-05-16
Classification: F01P,F02B

Abstract:
A hand-guided working tool comprising:a housing;an internal combustion engine arranged in said housing;said internal combustion engine comprising a cylinder, a crankshaft, and a crankcase enclosing said crankshaft;an air filter box including an air filter element connected to said internal combustion engine;a tool driven by said crankshaft;said housing having a blower chamber;said blower chamber having a cooling air inlet, at least one separate combustion air inlet, and a combustion air outlet;a combustion air channel connecting said combustion air outlet to said air filter box;a blower, driven by said crankshaft and arranged in a blower chamber, for taking in cooling air through said cooling air inlet and supplying the cooling air to said internal combustion engine and for taking in combustion air through said at least one combustion air inlet and supplying the combustion air through said combustion air outlet, said combustion air channel, and said air filter box to said internal combustion engine;said blower comprised of a first blower wheel for conveying cooling air and a second blower wheel for conveying combustion air radially outwardly relative to said blower wheel; andwherein said at least one separate combustion air inlet is positioned opposite an end face of said second blower wheel facing said internal combustion engine.