Patent ID: 7185557

Claim:
In a machine with at least one cylindrical housing with a central axis having at least one reciprocating piston traveling in the cylindrical housing along the central axis between a top dead center position and a bottom dead center position, a crankshaft rotatably mounted in a crankcase in said machine for rotation about a crank axis with at least one crankpin radially disposed on said crankshaft and having a crankpin axis parallel to the crank axis, and a connecting rod with an upper end pivotally attached to said piston at an upper end journal and a lower end pivotally attached to said crankpin at a lower end journal, said upper end pivoting about an upper end journal axis parallel to said crank axis and said lower end pivoting about a lower end journal axis parallel to said crank axis; a mechanism comprising an eccentric bearing with an axially eccentric journal having an eccentric journal axis parallel to the lower end journal axis and offset from the crankpin axis, said eccentric bearing interposed between the lower end and crankpin to generate a noncircular path for the lower end during rotation of the crankshaft in the crankcase.