Patent ID: 8651085

Claim:
A system for lubricating normally abutting bearing surfaces between a piston pin and a small end journal of a connecting rod of an internal combustion engine in which the piston pin and the small end journal together provide a rotatable connection between a piston and its corresponding connecting rod, the system comprising: a source of lubricating oil being pumped under a first level of pressure; communicating passages formed in a crankshaft and the connecting rod of the engine for delivering lubricating oil from the source to the abutting bearing surfaces; an inertia pump installed within the connecting rod in communication with the communicating passages to provide a predetermined measure of lubricating oil between the abutting surfaces at a second pressure level that is higher than the first pressure level in reaction to the movement of the connecting rod wherein the pump has a first unbiased mass element which forces the predetermined measure of lubricating oil towards the pump outlet as the piston approaches bottom dead center portion of its stroke; and a second unbiased mass element which moves from a first position, that allows oil to flow at the first pressure level from the source and through the pump to the normally abutting surfaces, to a second position, blocking the oil flow from the source thereby allowing the predetermined measure of oil forced by the first unbiased mass element to flow from the pump outlet.