PURPOSE: To provide an engine having advantages of both the internal combustion engine and the tubine by combining a turbine and pistons to rotate the turbine by the explosion force.

CONSTITUTION: A suction valve 9 is opened to introduce the fuel air mixture in a cylinder 2. A wheel 3 closes a combustion chamber 5 as a piston 18 goes into the compression stroke. A sluice valve 8 is pushed open as the mixture pressure increases and the mixture is sent into the combustion chamber 5. When the piston 18 reaches its upper dead point the combustion chamber 5 which has been closed by the wheel 3 is opened to have pressure receiving plates 4 exposed to the explosion force caused by ignition plug 6 just before the combustion chamber opens thereby rotating the wheel 3. The exhaust is discharged from a exhaust port 7 as the wheel 3 turns. This action is repeated alternatively by the left and right pistons to rotate the wheel 3 which is transmitted via a gear 19 and 20 to a crankshaft 17.