Arrangement in a two cycle combustion engine with internal combustion

Arrangement of a two cycle combustion engine (10,100) having internal combustion, comprising a number of engine cylinders (21;

• 21-1-21-5), which are arranged in an annular series around a common middle drive shaft (11) and which have cylinder axes running parallel to the drive shaft, each cylinder including a pair of pistons (44,45) movable towards and away from each other and a common, intermediate working chamber (K) for each pair of pistons, while each piston (44,45) is provided with its axially movable piston rod (48,49), the free outer end of which forms via a support roller (53,55) a support against its curve-shaped, “sine”-like curve shaped, cam guide device (12a,12b), which is arranged at each of opposite ends of the cylinder (21;
• 21-1-21-5) and which controls movements of the piston relative to the associated cylinder,
• characterized in that
• the two pistons (44,45) in each cylinder (21;
• 21-1-21-5) have mutually differing piston phases, which are controlled by mutually differing cam guide devices (12a,12b),
• the cam guide devices (12a,12b) being designed with equivalent mutually differing “sine”-like planes (8a,8b),
• the respective cam guide devices (12a, 12b) of the two pistons (44,45), in certain portions (1a-3a, 5a-7a;
• 1b-3b, 5b-7b) of the “sine”-like plane (8a,8b) are phase-displaced relative to each other and that remaining portions (4a,4b) of the “sine”-like planes are in mutual phase.