Piston-piston ring assembly and method for reducing engine exhau

Details Piston-piston ring assembly and method for reducing engine exhau Piston-piston ring assembly and method for reducing engine exhau

1995-10-10

1997-08-12

Denion, Thomas E.

Expansible chamber devices

Piston

Open-ended hollow skirt type

92 82, 29888049, 1231936, 123568, 277171, 277173, F16J 104

Patent

active

056554338

ABSTRACT:
A piston--piston ring assembly for an internal combustion engine reduces hydrocarbon emissions without significantly increasing the cost of the engine. The assembly includes an upper piston ring groove and a piston ring which acts as check valve to prevent combustion gases trapped below the upper piston ring from re-entering the combustion chamber when the exhaust valve is opened. The invention also includes a venting means for providing fluid flow communication between the crankcase side of the upper piston ring and the crankcase, around one or more lower piston rings, so that any trapped combustion gases are vented only in the downward direction toward the crankcase. The venting means includes a vent passageway slot in the lower piston groove, as well as an aperture adjacent to the lower piston ring groove.

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