Internal restraining path in a rotor

An engine having two traverses oppositely positioned and linearly actuated, the engine comprising:

• a rotor having an inner surface of an outer ring, wherein the rotor is mounted on a shaft of the engine, wherein the rotor is fixed to the shaft that passes through the engine;
• two support bearings provided to the rotor, wherein the support bearings are mounted oppositely within the rotor, each support bearing has a revolving insertion positioned between an external ring and an internal ring, wherein the two support bearings are connected to the traverses, and wherein the external ring rolls over the inner surface of the rotor so that a linear movement of the traverses is converted to rotation of the rotor;
• and
• an inner ring that is concentric to the outer ring wherein an outer surface of the inner ring is distant from the inner surface of the outer ring in a distance that corresponds the diameter of the external ring of the supporting bearing,
• wherein the outer ring and the inner ring form an internal restraining path in which the two supporting bearings rotate.