Portable handheld drilling machine having an internal combustion engine

A portable handheld drilling machine defining a longitudinal axis and said portable handheld drilling machine comprising:

• an internal combustion engine having an engine block and a crankshaft;
• a transmission housing accommodating a transmission therein;
• said transmission having an input shaft driven by said crankshaft and having an output shaft accommodating a chuck thereon;
• said crankshaft having an end facing away from said transmission;
• an engine housing for accommodating said engine therein and said engine housing having a housing spiral formed therein;
• a cooling air blower mounted on said end of said crankshaft for moving cooling air though said engine housing via said spiral;
• said engine including a cylinder, crankcase, carburetor and exhaust-gas muffler and said engine housing surrounding said cylinder, said crankcase, said carburetor and said exhaust-gas muffler;
• said engine housing having a handle formed thereon for holding and guiding said machine;
• said engine housing having a front end and a rear end in the direction of said longitudinal axis;
• said engine housing being open in said front and rear ends;
• said transmission housing being attached to said engine block;
• said transmission housing projecting in the direction of said longitudinal axis through said front end with a peripherally extending play (v);
• said housing spiral being disposed in said rear end with a peripherally extending play (u);
• and,
• said engine housing having a handle formed thereon for holding and guiding said machine and said handle extending bridge-like over said rear end of said engine housing.