Two-stroke engine, sand core for producing a two-stroke engine, and method for operating a two-stroke engine

A two-stroke engine comprising:

• a cylinder with a combustion chamber disposed therein;
• a piston reciprocatingly supported in the cylinder and delimiting the combustion chamber;
• a crankshaft rotatably supported in a crankcase and driven in rotation by the piston;
• at least two transfer passages having an opening that opens into an interior of the crankcase, the at least two transfer passages connecting the crankcase in at least one position of the piston with the combustion chamber, wherein the transfer passages each open by a piston-controlled transfer port provided in the cylinder into the combustion chamber;
• wherein the at least two transfer passages each have a passage length beginning at the transfer port and ending at the opening;
• an inlet that opens into the crankcase;
• an outlet provided at the combustion chamber;
• wherein the two-stroke engine is dividable into four sectors:
• a first sector, a second sector, a third sector, and a fourth sector that extend parallel to a longitudinal cylinder axis, respectively;
• wherein the transfer port of a first one of the transfer passages is arranged in the first sector, wherein the outlet is arranged in the second sector adjoining the first sector, wherein the transfer port of a second one of the transfer passages is provided in the third sector adjoining the second sector, and wherein the inlet into the crankcase is arranged in the fourth sector that is located between the first sector and the third sector;
• wherein, within the cylinder, the first and second transfer passages each have a segment of the passage length, said segment of the passage length arranged at a spacing to a separation plane between the cylinder and the crankcase, wherein said segments of the passage length pass together into one of the second and fourth sectors adjoining the first and third sectors;
• wherein the first and second transfer passages have a common passage segment in which the first and second transfer passages extend together, wherein the common passage segment is a segment of the passage length of the first and second transfer passages located at an end of the passage length facing the crankcase;
• and
• wherein the common passage segment ends at the opening of the first and second transfer passages and opens with the opening of the first and second transfer passages into the crankcase, wherein the opening of the first and second transfer passages is positioned in the second sector below the outlet or is positioned in the fourth sector below the inlet.