Patent ID: 7124719

Claim:
Apparatus for controlling flow of air-fuel mixture to and exhaust gases from a combustion chamber of an internal combustion engine, the engine having a cylinder and a piston reciprocally traveling in the cylinder, said apparatus comprising: a cylinder head of said cylinder; said cylinder head having an outer wall and an inner wall defining a space therebetween: a single rotor filling said space between said inner and outer walls and rotatable in said space around a center of the rotor; said outer wall having a first port for intake of air-fuel mixture and a second port for outflow of exhaust gases; said inner wall having first and second ports aligned with said ports in the outer wall; said first and second ports in said outer wall being disposed at equal distances from the center of the rotor; said first and second ports in said inner wall being disposed at equal distances from the center of the rotor in correspondence and alignment with said first and second ports in said outer wall; said rotor having first and second openings at equal distances from the center of the rotor which selectively provide direct communication via said openings between said first and second ports in the outer wall and said first and second ports in said inner wall as said rotor rotates, and means for rotating said rotor in synchronism with travel of the piston in the engine so that said openings in said rotor and said ports in the inner wall of the cylinder head communicate with the ports in the outer wall of the cylinder head in correspondence with intake, compression, power and exhaust strokes of the engine, wherein said openings in the rotor are circular and the ports in the inner and the outer walls are curved slots.