Importance

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Abstract

A refrigeration gas compressor comprises a piston reciprocably movable to effect gas compression, a motor-driven rotatable crank shaft, and a connecting rod between a crank shaft, crank pin and a piston wrist pin. A crank pin receiving hole and a wrist pin receiving hole in the connecting rod are connected by an oil passage. The crank pin has two lubricating oil supply ports at opposite sides of its outer surface through which lubricating oil is pumped. A bearing assembly comprising semi-circular upper and lower bearing sections is disposed around the crank pin. The upper bearing section has wedge-shaped oil well recesses at opposite ends of its inner surface which receive oil from the oil supply ports. The upper bearing section also has two oil feed holes therethrough for supplying oil from the wells to a groove in the crank pin hole side wall adjacent the upper bearing section. A circumferentially extending groove in the inner surface of the lower bearing section receives oil from the oil supply ports and communicates with the oil well recesses. The rotational upward compression stroke of the crank pin causes oil to be drawn toward the narrow end of one wedge-shaped recess to effect high pressure hydrodynamic lubrication in the load bearing zone between the upper bearing section and the crank pin. Oil also flows at pump pressure from the oil well recesses through the other flow paths.

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First Claim