Rotor-following type engine structure with curved or straight cylindrical cylinders

The invention discloses a rotor-following type engine structure with curved or straight cylindrical cylinders. The rotor-following type engine structure comprises four curved or straight cylindrical cylinders, four pistons, a pair of crossed support frames, a pair of concentric shafts, a pair of elliptical gears, and the other pair of elliptical gears, wherein the four pistons are matched with the cylinders; two ends of the two support frames are connected with the cylinders or the pistons and can rotate around center shaft holes; the concentric shafts are fixedly mounted at the center shaft holes of the two support frames respectively; the elliptical gears are fixedly mounted on outer shafts and inner shafts of the concentric shafts respectively; the other pair of elliptical gears are meshed with the elliptical gears respectively and are fixed on a power output shaft in a manner of being perpendicular to each other. Through the structure, all the paired pistons achieve relative reciprocation motion in the cy