PURPOSE: To heighten output limit of an internal combustion engine and limit of engine speed by placing a rotating blocking object between a suction and exhaust air pipe and a combustion chamber and by drilling a hole on a part of it so as to let m mixed gas in and to let exhaust gas out.

CONSTITUTION: In place of a suction and exhaust air device (suction and exhaust valve) of an internal combustion engine, a rotating blocking object is placed between suction and exhaust pipes 1, 2 and a combustion chamber 9. A hole is drilled on a part of it, and when the hole passes between the suction pipe 1 and the combustion chamber 9, mixed gas is let in. At the time when it passes between the exhaust pipe 2 and the combustion chamber 9, exhaust gas is let out. Transmission of opening and closing work of the suction and exhaust pipes is carried out under a rotational opening and closing system to use rotary motion of a crankshaft as it is. A camshaft is used for a rotation axis, and a part of a suction hole is made thick. As a valve spring is eliminated, there is no opening state due to elastic limit of a spring. Consequently, it is possible to heighten output limit of the internal combustion engine limit of engine speed and to improve miniaturization and lightening.