Work apparatus with internal combustion engine

1 . A work apparatus, comprising:

an internal combustion engine ( 12 ), including

a crankcase ( 16 ) in which a crankshaft ( 26 ) is mounted rotatably about an axis of rotation ( 17 ), and

a cylinder ( 19 ) arranged on the crankcase ( 16 );

a fan spiral ( 41 ) having

a first outlet opening ( 44 ) for a first cooling air flow ( 46 ) and

a second outlet opening ( 45 ) for a second cooling air flow ( 47 );

a fan wheel ( 42 ) arranged in the fan spiral ( 41 ) for conveying cooling air for the internal combustion engine ( 12 ); and

a cooling air duct ( 40 ) flow-connected to the second outlet opening ( 45 ) of the fan spiral ( 41 ) and extending from the fan spiral ( 41 ) around the cylinder ( 19 ),

wherein the cylinder ( 19 ) has

a first outer side ( 38 ) facing the fan wheel ( 42 ) and

a second outer side ( 39 ) facing away from the fan wheel ( 42 ),

wherein the first cooling air flow ( 46 ) exits the fan spiral ( 41 ) through the first outlet opening ( 44 ) proximal to the first outer side ( 38 ) of the cylinder ( 19 ), and

wherein the second cooling air flow ( 47 ) flows through the cooling air duct ( 40 ) around the cylinder ( 19 ) and exits the cooling air duct ( 40 ) proximal to the second outer side ( 39 ) of the cylinder ( 19 ).

2 . The work apparatus according to claim 1 ,

wherein the first outlet opening ( 44 ) and the second outlet opening ( 45 ) have an angular distance (α) of less than 90°, measured relative to the axis of rotation ( 17 ) of the crankshaft ( 26 ).

3 . The work apparatus according to claim 2 ,

wherein the angular distance (α) between the first outlet opening ( 44 ) and the second outlet opening ( 45 ) is less than 60°.

4 . The work apparatus according to claim 1 ,

wherein a scoop ( 48 ) is provided on the fan spiral ( 41 ) at the second outlet opening ( 45 ).

5 . The work apparatus according to claim 1 ,

wherein the fan spiral ( 41 ) extends radially to the axis of rotation ( 17 ) of the crankshaft ( 26 ) from a radial inner side ( 49 ) to a radial outer side ( 50 ),

wherein the fan spiral ( 41 ) can be conceptually divided radially to the axis of rotation ( 17 ) in half into an inner zone ( 54 ) and an outer zone ( 55 ), and

wherein the second outlet opening ( 45 ) lies substantially in the inner zone ( 54 ) of the fan spiral ( 41 ).

6 . The work apparatus according to claim 5 ,

wherein the second outlet opening ( 45 ) adjoins the radial inner side ( 49 ) of the fan spiral ( 41 ).

7 . The work apparatus according to claim 1 ,

wherein the cooling air duct ( 40 ) has an outlet opening ( 52 ) which is designed in such a way that the second cooling air flow ( 47 ) is directed at the second outer side ( 39 ) of the cylinder ( 19 ).

8 . The work apparatus according to claim 1 ,

wherein the cooling air duct ( 40 ) has a minimum flow cross-section of at least 50 mm 2 .

9 . The work apparatus according to claim 1 ,

wherein the cooling air duct ( 40 ) runs at least partially along an outer side ( 32 ) of the crankcase ( 16 ).

10 . The work apparatus according to claim 9 ,

wherein the cooling air duct ( 40 ) is at least partially delimited by the outer side ( 32 ) of the crankcase ( 16 ).

11 . The work apparatus according to claim 1 ,

wherein the cooling air duct ( 40 ) comprises a further outlet opening ( 53 ) for cooling an injector of the internal combustion engine ( 12 ).

12 . The work apparatus according to claim 1 ,

wherein the internal combustion engine ( 12 ) comprises a duct part ( 35 ),

wherein the duct part ( 35 ), arranged on the crankcase ( 16 ), forms the cooling air duct ( 40 ), and at least partially surrounds a cylinder flange ( 66 ) for forming an intake duct ( 30 ) in a region of the cylinder ( 19 ).

13 . The work apparatus according to claim 12 ,

wherein the internal combustion engine ( 12 ) comprises a cover ( 65 ),

wherein the cover ( 65 ) extends over the cylinder ( 19 ) and, interacting with the duct part ( 35 ), engages around the cylinder flange ( 66 ) in a sealed manner.

14 . The work apparatus according to claim 1 ,

wherein the crankshaft ( 26 ) of the internal combustion engine ( 12 ) has an output side ( 56 ) to which a tool or means for driving the tool can be connected,

wherein the crankshaft ( 26 ) has an end side ( 57 ) opposite the output side ( 56 ), and

wherein the fan wheel ( 42 ) is arranged on the end side ( 57 ) of the crankshaft ( 26 ).

15 . A work apparatus, comprising:

an internal combustion engine ( 12 ), including

a crankcase ( 16 ) in which a crankshaft ( 26 ) is mounted rotatably about an axis of rotation ( 17 ), and

a cylinder ( 19 ) arranged on the crankcase ( 16 );

a fan spiral ( 41 ); and

a fan wheel ( 42 ) arranged in the fan spiral ( 41 ) for conveying cooling air for the internal combustion engine ( 12 ),

wherein the cylinder ( 19 ) has

a first outer side ( 38 ) facing the fan wheel ( 42 ) and

a second outer side ( 39 ) facing away from the fan wheel ( 42 ),

wherein the fan spiral ( 41 ) has

a first outlet opening ( 44 ) for a first cooling air flow ( 46 ) for cooling the first outer side ( 38 ) of the cylinder ( 19 ), and

a second outlet opening ( 45 ) for a second cooling air flow ( 47 ) for cooling the second outer side ( 39 ) of the cylinder ( 19 ), the second outlet opening ( 45 ) being flow-connected to a cooling air duct ( 40 ), and

wherein the cooling air duct ( 40 ) extends from the fan spiral ( 41 ) to an outlet opening ( 52 ) located adjacent to the second outer side ( 39 ) of the cylinder ( 19 ), the outlet opening ( 52 ) being configured to direct the second cooling air flow ( 47 ) towards the second outer side ( 39 ) of the cylinder ( 19 ).