Importance

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Abstract

A compression ring is provided for mounting in an annular groove formed in a piston head utilized in an internal combustion engine. The ring includes an inner section positionable within the groove and an outer section protruding from the groove for sliding sealing engagement with the wall of the cylinder in which the piston head is reciprocally mounted. The ring inner section is provided with opposite side surfaces. Each side surface includes a first segment extending inwardly from the outer section and being in substantially parallel relation with an adjacent side wall of the groove in which it is accommodated. The ring side surface also includes a second segment which is angularly disposed relative to and extends inwardly from the first segment and is in continuous spaced relation with the adjacent side wall of the groove. The distance between the first segments of the ring inner section side surfaces are less than the distance between the side walls of the groove. Thus, when the ring is disposed within the groove, the first segment of one side surface of the ring inner section coacts with the adjacent side wall of the groove to form a first clearance. The first clearance communicates with a second clearance formed between the second segments of both side surfaces of the ring inner section. The first and second clearances communicate with a combustion chamber within the cylinder when the piston head is moving in its power stroke within the cylinder.

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First Claim