Patent ID: 9404452
Filing Date: 2016-08-02
CPC Classification: B25F,F02B,F02M

Claim Text:
1. A portable, hand-held, combustion engine powered working machine, comprising: a tool unit including a working tool; a machine unit including an internal combustion engine with a crankshaft; an assembly for supplying cleaned air and fuel to the engine, having an upstream air inlet; a fan housing located in an outer end of the machine unit and having an air inlet for ambient air; a fan wheel arranged in the fan housing; the fan wheel driven directly or indirectly by the crankshaft to supply cooling air, sucked in through the air inlet to cool the engine; a combustion air duct having a combustion air intake opening located radially outside of the fan wheel leads the combustion air to the assembly for supplying cleaned air and fuel to the engine, wherein the fan wheel has a fan wing width measured in a direction is perpendicular to the fan wheel; and at least one shielding element is used to steer away air and especially particles in the air from said combustion air intake opening to provide a strong cleaning effect of the combustion air in said combustion air duct, and a first shielding element is arranged in the form of a deflector attached to said combustion air intake opening and running in an essentially longitudinal direction, wherein the deflector has a flat or concave shaped outer side, wherein a tangential line oriented along the outer side of the deflector does not intersect with the leading edge of the outer side of said combustion air intake opening.