Patent ID: 6923153

Claim:
A piston and connecting rod assembly for use with an internal combustion engine, said assembly comprising: a piston adapted for reciprocal movement within a cylinder of the internal combustion engine, said piston having a body including a pin bore formed therein; a connecting rod adapted to interconnect said piston and a crankshaft so as to translate the reciprocal movement of the piston into rotational movement of the crankshaft, said connecting rod having first and second ends with at least one of said ends including a terminal end and a bore housing depending therefrom that tapers inwardly toward said terminal end, said bore housing having a bore extending therethrough and adapted to be aligned with said pin bore in said piston; a pin adapted to be operatively received through said aligned pin bore in said piston and said bore extending through said end of said connecting rod, said pin including a pair of distal ends, a center portion formed therebetween and a smoothly profiled outer circumference that is substantially circular in cross-section with a larger diameter at said distal ends than at said center portion and tapers gradually from said distal ends to said center portion; and said end of said connecting rod aligned with said piston pin bore including a phosphatized coating that is adapted to facilitate relative angular movement between said bore extending through said connecting rod and said outer circumference of said profiled piston pin thereby facilitating reciprocal motion of said piston relative to the cylinder of an internal combustion engine.