CONNECTING-ROD WITH ONE OR MORE RECESS IN THE STEM TO REDUCE MASS, OPTIMIZE THE BALANCING BETWEEN ROTATING AND RECIPROCATING MASSES, AND OPTIMIZE THE CONNECTING-ROD BEARINGS MINIMUM OIL FILM THICKNESS

摘要

A connecting rod for connecting between a crankshaft and a piston, includes a small end with a cylindrical hole adapted to for receiving a piston pin, a big end having a crank pin bore adapted for receiving a crank pin of a crankshaft and a stem portion extends between the small end and big end. The stem portion can have an I-beam cross-section with a pair of legs and a web extending between the pair of legs. The web includes oppositely facing surfaces defining a thickness that is less than a thickness of the pair of legs. The web includes at least one grooved/recessed portion that is recessed relative to the oppositely facing surfaces of the web.