Piston pin for internal combustion engine

摘要

In a piston engine, end play of the piston pin can be prevented without unduly shortening the pin. In the simplest design (FIG. 4), a full length piston pin can have spherical end surface in close clearance spacing relative to the combustion chamber surface, so that any tendency of the pin to shift along the pin axis is immediately resisted by contact between a spherical end surface and the combustion chamber surface. The area of each spherical surface is sufficient to prevent wear or scratching of the combustion chamber surface. An alternative full length piston pin design incorporates spherical sheet-metal caps snapped in place at the ends (FIG. 2), which fix the pin (and caps) from coming into contact with the cylinder bore wall.