Abstract: A two-stroke internal combustion engine comprising a combustion space, which is enclosed by a cylinder having an end wall, and a piston that is connected to a crankshaft, which piston is capable of reciprocating motion within the cylinder between a position in which the combustion space has a minimum volume and a position in which the combustion space has a maximum volume, wherein a first valve is capable of closing an inlet opening in the end wall and a second valve is capable of closing an outlet opening in the end wall, which outlet opening is at least substantially closed and the inlet opening is open at the moment when the piston is in the position in which the combustion space has its minimum volume, and wherein the minimum volume of the combustion space in cold condition amounts to less than 3% of the maximum volume of the combustion space.

Abstract: A valve gear includes a housing provided with a passage, a valve member arranged within the housing, which is movable between a first, closed position, in which the passage is closed, and a second, open position, a piston connected to the valve member, which can oscillate in an at least substantially closed piston chamber, and a locking device which are capable of holding the valve member periodically in the closed position. The piston chamber is provided with at least three closable openings, which may each be in communication with a gas pressure device. The first opening and the second opening are each in communication with another part of the piston chamber separated therefrom by the piston, and which are open when the valve member is held in the closed position, and wherein the third opening is open during movement of the piston.

Abstract: A two-stroke internal combustion engine comprising a combustion space, which is enclosed by a cylinder having an end wall, and a piston that is connected to a crankshaft, which piston is capable of reciprocating motion within the cylinder between a position in which the combustion space has a minimum volume and a position in which the combustion space has a maximum volume, wherein a first valve is capable of closing an inlet opening in the end wall and a second valve is capable of closing an outlet opening in the end wall, which outlet opening is at least substantially closed at the moment when, at least substantially not before said moment, and the inlet opening is open at the moment when the piston is in the position in which the combustion space has its minimum volume, and wherein the minimum volume of the combustion space in cold condition amounts to less than 3% of the maximum volume of the combustion space.