Patent ID: 7845318

Claim:
An intake and exhaust device equipped with a first valve disk and a second valve disk, comprising: a cylinder in which an intake port and an exhaust port are formed; a circular first valve disk in which a first hole corresponding to one of the intake port and the exhaust port is formed, and that covers an upper side of the cylinder including the intake port and the exhaust port; a circular second valve disk that is slidingly overlapped on the first valve disk and in which a second hole corresponding to the first hole is formed; a first driving portion for rotating a first driving pipe that is fixed to a center of the first valve disk; a second driving portion for rotating a second driving pipe that surrounds the first driving pipe and is fixed to the second valve disk; and a control portion for controlling the first driving portion and the second driving portion, wherein the intake port or the exhaust port opens or closes when the first valve disk or the second valve disk rotate.