Patent ID: 8499726

Claim:
A 2-stroke internal combustion engine comprising: a crankshaft having a plurality of journals; two opposed cylinders having their inner ends adjacent to the crankshaft, each cylinder having inner and outer pistons reciprocatably disposed therein and forming a combustion chamber therebetween; first and second scotch-yoke mechanisms, rigidly attached to the inner pistons, which, acting in unison, drivingly couple the inner pistons to their corresponding journals on the crankshaft; and a third scotch-yoke mechanism, rigidly attached to the outer pistons, which drivingly couples the outer pistons to their corresponding journal on the crankshaft; wherein each cylinder comprises a sleeve-valve with one or more exhaust ports at one end and one or more intake ports at the other; wherein a rigid extension to the end of the sleeve-valve adjacent to the crankshaft contains a hole drivingly coupled to a first eccentric spherical journal on one end of the crankshaft, the extension being split at the hole's diameter through a plane normal to the cylinder's axis forming a removable cap fastened to the extension in order to enable assembly.