Vilter Manufacturing LLC

Vilter Manufacturing Company

John G Nikolaus

Erich J Kocher

Paul G Szymaszek

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.

Connecting rod bearing assembly

A multi-cylinder single-stage rotary rolling piston type gas compressor comprises four modular cylinder housings, partitions and end covers bolted together in end-to-end arrangement. Each cylinder housing includes an inner wall which defines a centrally located cylinder chamber and vane slot and an outer wall which defines a suction chamber, a discharge chamber and an oil chamber or reservoir surrounding the cylinder chamber. The four suction chambers are connected together end-to-end to a common gas inlet port. The four discharge chambers are connected together end-to-end to a common gas discharge port. The four oil chambers are connected together end-to-end. An internally lubricated rotor assembly extends axially through the four cylinder chambers and comprises a shaft rotatably supported on the end covers. The shaft has four eccentric crankarms on which four roller pistons are rotatably mounted, one for each cylinder chamber. The two central pistons are angularly displaced 180.degree. from the two end pistons to provide balance. The rotor shaft drives an oil pump connection to the oil reservoir. Each vane slot for a cylinder chamber has at least one reciprocably movable low-mass hollow externally-grooved spring-biased gas-pressurized vane slidably mounted therein and slidably engaged with an associated roller piston. Each cylinder chamber has a gas suction port in the inner wall on one side of the vane slot communicating with the suction chamber. Each cylinder chamber has a plurality of gas discharge ports in the inner wall on the other side of the vane slot and each discharge port accommodates a spring- and gas-pressure biased, normally closed, gas-operated poppet type discharge valve which allow complete gas expulsion to the discharge chamber.

Growing community of inventors

West Allis, WI, United States of America

John G Nikolaus