Patent ID: 8875673

Claim:
An improved internal combustion engine, comprising: a driveshaft and means mounting the driveshaft for rotation about an axis; at least one pair of aligned and opposed cylinders; at least one double-headed piston, having at least one rigid connection between the piston heads, reciprocating in said pair of cylinders; a circular crankdisk, for each said piston respectively, installed on said driveshaft; the said crankdisk having an outer annular surface formed about a center that is laterally offset from the center of rotation of the said driveshaft, and rigidly attached to the said driveshaft; the said piston body having a first slot, a second slot perpendicular to the first slot, each of said slots being perpendicular to the axis of the driveshaft and the crankdisk, the first slot being perpendicular to the piston axis and allowing the rotating movement of the driveshaft, and the second slot allowing the rotating movement of the crankdisk; a flat I-profile bearing ring, mounted on the annular surface of the said crankdisk, which engages slidably under hydrodynamic conditions the annular surface of the said crankdisk, and rolls or slides against the inside walls of the said second slot provided axially through the double-headed piston; wherein the improvement comprises of a linear U-profile groove or depression on the said second slot surface of the piston within which said bearing ring slides or rolls; wherein the said linear U-profile groove or depression sides or flanges on the said second slot wall of the piston, fit tightly but slidably on the said bearing ring, and keep the bearing in its designed place when the crankdisk rotates; whereby the said crankdisk with the aid of the said bearing ring transmits the piston force of the double-headed piston to the driveshaft and causes the driveshaft to rotate about its axis.