Hand-held work apparatus powered by internal combustion engine

摘要

A hand-held work apparatus includes an engine housing (200). An internal combustion engine (202) is arranged in the engine housing (200) and includes a cylinder (204) and a crankshaft. A fan wheel (214) is driven directly or indirectly by the crank shaft, such that the fan wheel (214) rotates about an axis A. A fan housing (216) surrounds and cooperates with the fan wheel (214). A combustion air inlet (224) is located radially outside of the fan wheel (214) for leading air to the internal combustion engine (202). Further, the combustion air inlet (224) includes a combustion air inlet port (226) and a combustion air duct (228). The combustion air inlet port (226) is provided with a first edge (230), which first edge (230) is located radially adjacent to the periphery (220) of the fan wheel (214). An angle X between a first line L1 extending radially from the axis A in a direction parallel to a main direction of the cylinder (204) and a radius L2 extending radially from the axis A in a direction such that it intersects with the first edge (230), is less than 70° and preferably less than 66°, and even more preferably less than 62°.

主权项

1. A hand-held work apparatus, comprising:
an engine housing; an internal combustion engine arranged in the engine housing and comprising a cylinder and a crankshaft; a fan wheel driven directly or indirectly by the crankshaft, such that the fan wheel rotates about an axis (A); a fan housing surrounding and cooperating with the fan wheel; a combustion air inlet located radially outside of the fan wheel for leading air to the internal combustion engine, the combustion air inlet comprises a combustion air inlet port and a combustion air duct; and the combustion air inlet port is provided with a first edge, wherein the first edge is located radially adjacent to a periphery of the fan wheel, wherein an angle (X) between a first line (L1), extending radially from the axis (A) in a direction parallel to a main direction of the cylinder, and a radius (L2), extending radially from the axis A in a direction such that it intersects with the first edge, is less than 70°, wherein a deflector located radially outside and in close proximity to the periphery of the fan wheel directs the flow of air blown out of the fan wheel away from the fan wheel, so as to at least prevent the air from continuing to circulate with the fan wheel.