Patent ID: 8528506

Claim:
A rotary internal combustion engine, comprising: a cylinder having a cylinder circumferential wall provided with a horizontal valve-groove on an inner circumferential surface thereof; a working shaft concentrically run through said cylinder and held to be freely rotatable; a rotor which includes a rotor base made of a circular shell, a rotor base surrounding wall, and a rotor blade standing in a radial direction of said rotor base surrounding wall, and which is firmly fixed to said working shaft; a shutoff valve which performs intermittent movements of insertion and returning between an outside of said cylinder and a cylinder space defined inside said cylinder, the shutoff valve including an adjusting valve which is provided on a lower edge of said shutoff valve and capable of extending from the lower edge of said shutoff valve; a electromagnet which moves said adjusting valve with respect to said shutoff valve; and left and right side lids each having one of two longitudinal valve-grooves; wherein in said cylinder space, both side faces of said rotor base and all outer edge portions of said rotor blade are hermetically in contact with left and right inner walls; when the insertion of said shutoff valve into said cylinder space is completed, both ends of said shutoff valve are hermetically held by said two longitudinal valve-grooves formed in said left and right side lids respectively, an upper portion of said shutoff valve is hermetically held by said horizontal valve-groove formed in said cylinder circumferential wall and a lower end surface of said shutoff valve is hermetically in contact with said rotor base surrounding wall to form a sliding face of said rotor base; immediately after passing of said rotor blade through a position of said shutoff valve, said shutoff valve is inserted into said cylinder space, and then said adjusting valve is extended from said shutoff valve by operating said electromagnet to stop up said cylinder space in a radial direction, and compressed mixed air, or compressed air and fuel is/are injected into a sealed layer, which serves as a combustion chamber and which is defined between said shutoff valve and said rotor blade, to be ignited or fired in said combustion chamber; and further said rotor blade is pressed with combustion expansion pressure, with said shutoff valve as a base point for a mechanical action, to directly provide rotation to said working shaft, and combustion gas is released through an exhaust hole and said shutoff valve is returned back to the outside of said cylinder for preparation of a next stroke to terminate one working stroke.