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Blowby Pressure Control Above an Oil Control Ring in a Reciprocating Internal Combustion Engine

Abstract: 

A plurality of passageways were provided between the inter-ring cylindrical surface of a piston and a cavity formed behind an oil control ring mounted on the piston. The passageway provides for the passage of blowby gas during downward movement of the piston, thereby permitting the oil control ring to seat against the upper surface of its groove. The present invention effectively controls the flow of oil toward the compression ring of the ring assembly without the requirement for a passageway communicating the inter-ring cavity with a saturated, turbulent flow, oil environment.

Patent Number: 
5,737,999
Date Of Issue: 
04/14/1998
Inventors: 

Susumu Ariga