Patent ID: 7503290

Claim:
A two-stroke internal combustion engine supplied with gasoline, diesel, fuel, or other conventional fuel comprising a piston-cylinder assembly, said cylinder providing exhaust ports, said piston-cylinder assembly providing a head slidable within said cylinder between the Top Dead Centre of the piston stroke and a closure position of the exhaust ports, said slidable head providing a transfer valve for fresh air or fresh air-fuel mixture within the compression and burst chamber of the piston-cylinder assembly, sliding of said slidable head inside the cylinder being controlled by actuation means co-ordinated with the piston actuation system, upward said slidable head a fresh air or fresh air-fuel mixture system being provided for suction during the stroke of said slidable head between the Top Dead Centre and the exhaust port closure point, said actuation means of the slidable head provide a crankshaft connected with the output shaft by a toothed belt, with a 1:1 transmission ratio, said cam having a particular thrusting curve, to act with delay on the slidable head notwithstanding it is rotating, said cam having a straight part allowing ascent of the head, by the action of springs, in a much quicker way, so that, when the piston closes the exhaust ports, head is at the Top Dead Centre, having already carried out the transfer action of the fresh mixture through the transfer valve.