Abstract: A displacement type rotary machine with non-rotatable housing, two mutually movable co-axial rotors includes an outer rotor movable along housing inside wall, and an inner rotor movable relative to an inner circumferential face of the outer rotor. The outer rotor has radially inwardly directed wings. The inner rotor has a hub with radially outwardly directed wings. Each inner rotor wing is movable between a pair of the outer rotor wings to create chambers. A free end of the inner rotor wings is movable adjacent a curved inside wall of the outer rotor. A free end of the outer rotor wings is movable adjacent the hub. Both rotors are movable adjacent a first cover on the housing. The inner rotor is in movable adjacent a second cover on the outer rotor. Controlling gears control movement of the rotors, the gears including elliptical gearwheels and circular gearwheels.

Abstract: A rotary piston machine of displacement type, comprising two mutually continuously movable parts (101, 102) having co-axial rotation axes (155) and mutually variable movement, wherein the first part (102) internally has at least two radially inwardly directed wings (139) with mutual angular distance along the curved inside wall (150) of the part between the wings (139), wherein the second part (101) has a hub (146) which has at least two radially outwardly directed wings (147) with mutual angular distance, wherein a portion of the hub (146) between the wings of the second part is in slidable or adjacent contact with a curved, free end portion (157) of the wings on the first part (102), wherein a curved, free end portion (158) of each wing on the other part (101) is in slidable or adjacent contact with the curved inside wall (150) on the first part (102) which is located between respective ones of two neighbouring wings (139) on the first part (102), wherein the wings (147) of the second part (101) being movab