Connecting rod bearing assembly

Abstract

A refrigeration gas compressor comprises a piston reciprocably movable to effect gas compression, a motor-driven rotatable crankshaft, and a connecting rod between a crank pin on the crankshaft, and a wrist pin on the piston. A crank pin receiving hole and a wrist pin receiving hole in opposite ends of the connecting rod are connected by an oil passage. The oil passage is connected to a groove in the upper side wall in the crank pin receiving hole. 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. Each bearing section has a smooth inner surface. The upper bearing section has oil well recesses near, but spaced from, opposite ends of its inner surface which receive oil from the oil supply ports each time a port moves therepast. The upper bearing section also has two oil feed holes therethrough for supplying oil from the oil supply ports, each time a port moved therepast, directly to the groove in the side wall of the crank pin hole behind the upper bearing section. Each oil feed hole is located between and spaced from both an oil well recess and an end of the upper bearing section. The rotational upward compression stroke of the crank pin causes oil to be drawn toward a narrow end of the oil well recesses to effect high pressure hydrodynamic lubrication between the upper bearing section and the upper side of the crank pin.