US 3,938,481 AGranted

Two-stroke internal combustion engine

OwnerClyde M. Mortoninventor

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Abstract

The invention relates to internal combustion engines of the reciprocal type, and more particularly to such engines in which the pressure for Diesel operation can be attained, or in which the power output of an Otto-cycle engine can be increased. The present invention makes possible either a Diesel engine of approximately the same axial crank offset and overall dimensions as an Otto-engine of equal throughput, or an Otto-engine having a higher throughput with slightly increased overall size and axial crank offset. The said gas supplies are impelled by two pressure inpellers which are synchronized to engine operation, a vertical pressure impeller receives a fuel-air mixture and the inverted pressure impeller receives air, a rotary metering pressure booster meters an amount of the fuel-air mixture and forces it under pressure into a pressure retaining chamber above the cylinder chamber ready to be released upon demand. A second rotary metering pressure booster supplying auxiliary air acts to scavenge and cool the cylinders at the end of each power stroke, as the fuel-air mixture is released from the pressure retaining chamber into cylinder chamber, and as engine speed increases an increasing amount of the auxiliary air will be trapped in the cylinder chamber and compressed together with the fuel-air mixture gradually raising the initial compression as it is compressed into the combustion chamber where it is ignited.

Claims22

Dependent claims

In a reciprocating two-stroke multiple cylinder internal combustion engine having a housing, a cylinder having a piston reciprocably mounted in the cylinder for movement alternately through compression and power strokes, said piston forming one end of a combustion chamber area when the piston is at top dead center, said cylinder having multiple exhaust ports through said cylinder wall and multiple scavenging air ports into said cylinder chamber, a supply port to said cylinder chamber for a fuel-air mixture, a pressure retaining chamber between said supply port and said cylinder chamber, and a pressure retaining valve means between said pressure retaining chamber and said cylinder chamber biased normally to closed position against pressure in said pressure retaining chamber, a fuel-air mixture supply line to said supply port including means for keeping said supply line under pressure, a continuously acting rotary metering pressure booster in said supply line having a metered capacity sufficient to fill said cylinder chamber when said piston is at the bottom of the stroke, a scavenging air line to said multiple scavenging ports including means for keeping said scavenging air line under pressure and a continuous acting rotary metering pressure booster in said scavenging air line having a metered capacity slightly in excess of said cylinder chamber when said piston is at bottom end of stroke, said second recited means being operable to cycylically supply scavenging air to said cylinder chamber at the end of the power stroke, said multiple exhaust and multiple scavenging ports being subject to opening and closing in response to movement of said piston, said rotary metering pressure boosters and said piston being operable in timed sequence to feed fuel-air mixture and scavenging air to said cylinder chamber sequentially.

Dependencies are inferred from the claim text.