Abstract: An internal combustion engine with rotating pistons works on the basis of the cat and mouse principle. The charge is axially exchanged over one of the housing lids (28) and the adjacent rotary side disk (24). The combustion chambers (34) are formed by axially open recesses in the pistons (24) of the outer rotor (12) which communicate transversely to the axial direction with the adjacent working chambers (20). The fuel is supplied by injection nozzles (30) oriented in the corresponding housing lid (28) in the direction of the rotary side disk (24).

Abstract: A rotation piston internal combustion engine has a substantially stationary housing defining a plurality of blind holes, and a rotor rotatably mounted within the housing for rotation at a substantially uniform velocity about an axis. A hub has four pistons and is rotatably mounted within the rotor for rotation about the axis at a non-uniform velocity. Four crankshafts are each rotatably mounted through a respective rib of the rotor and coupled to a respective gear wheel so that the gear wheel rotates with the crankshafts. A ring gear is coupled to the housing for engaging the gear wheels to permit rotation of the gear wheels relative to the housing. The ring gear has a plurality of apertures having a second diameter, each corresponding in position to a respective blind hole in the housing.

Abstract: A rotary piston-internal combustion engine has a stationary engine housing with a central axis. A rotor is positioned within the housing and includes a cylinder with first pistons integral with and spaced uniformly apart around the inner surface of the cylinder. The first pistons are sector-shaped. The rotor rotates at a constant velocity. A hub is located within the cylinder coaxial with the central axis and can rotate relative to the cylinder and first pistons. Second pistons are fixed to the hub and each extends radially outwardly from the hub between a pair of adjacent first pistons. Openings extend through the cylinder and are arranged symmetrically relative to axially extending central plane of the first pistons. Seals are provided around the openings between the outside surface of the cylinder and the interior of the housing.