Internal combustion engine

An internal combustion engine, comprising:

• a cylinder able to rotate about a rotational axis;
• a combustion chamber defined in the cylinder;
• and
• a drive part, the drive part comprising:
• the drive parts comprised of
• a piston housed in the cylinder to be able to slide in a direction of the rotational axis and defining the combustion chamber;
• a slot formed in a circumferential surface of the cylinder at an opposite side to the combustion chamber relative to the piston;
• a cam stationarily set around the slot, which cam has a profile oscillating in a direction of the rotational axis while being annular in a circumferential direction of the rotational axis;
• and
• a follower extending from the piston through the slot to the cam, and configured to move together with the piston along profile of the cam,
• wherein the slot is configured to limit relative movement of the follower together with the piston with respect to the cylinder in a circumferential direction of the rotational axis, while allowing relative movement of the follower together with the piston with respect to the cylinder in a direction of the rotational axis,
• wherein combustion performed in the combustion chamber moves the piston together with the follower along profile of the cam to thereby rotate the cylinder about the rotational axis, and
• wherein the rotation of the cylinder is taken out as engine output.