Hand-held work apparatus powered by internal combustion engine

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 leadin˜ 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 fan housing cover forms a part of the fan housing and at least a part of the combustion air inlet forms one unit with the fan housing cover, and
• wherein the combustion engine comprises a crankcase and a part of the combustion air inlet is formed in said crankcase.

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°, and
• wherein the combustion air inlet port is provided with a second edge, disposed downstream and radially outside of the first edge in relation to the fan wheel, and the second edge is disposed on the same side as the fan wheel of a tangent (T), which is defined as the tangent of the periphery of the fan wheel which intersects with the first edge.

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°, and
• wherein a shield portion is arranged in the close proximity to the combustion air inlet port and spans an angle (Y) defined by two lines which extend radially from the axis (A) in a direction such that they intersect with a first edge and second edge of the shield portion, respectively, and wherein the angle (Y) is at least 5°.

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 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 and in close proximity to a periphery 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;
• a deflector located radially outside and in close proximity to the periphery of the fan wheel which 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, wherein the combustion air inlet forms one single unit with the deflector, which unit separates the flow such that a flow with low particle density is enabled to be conducted into the combustion air inlet, and a flow with higher particle density is enabled to be used for cooling at least the cylinder of the internal combustion engine,
• wherein the combustion air inlet port is provided with a first edge, wherein the first edge is located radially adjacent to the periphery of the fan wheel, and, 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°.

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, and the first edge is disposed at a radial distance d1 from the axis (A) along a radius (L2) extending in a radial direction of the fan wheel, which radius (L2) intersects with the axis (A) and the first edge,
• wherein a distance (d2) between the first edge and the fan housing along the radius (L2) is at least 0.65(d1).