Importance

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Abstract

For fabricating a compression piston ring, two identical split-ring members are formed, each having parallel planar side faces and a cylindrical outer edge face. For each ring member, circumferentially overlapping fingers are formed at the adjoining ends, one being an outer finger and one being an inner finger; and these fingers are provided with radially contiguous cylindrical faces, concentric with the outer edge face. The confronting side faces of the two ring members are preferably provided with a lap finish. The rings are assembled in side-by-side contiguous relation, with the outer finger ends thereof overlapping to some extent; and these overlapping ends are joined by means of at least one silver solder joint which is located adjacent to the outer fingers, so that these outer fingers are protected by the adjacent ring member. For fabricating a fully sealed compression-oil ring combination, a first compression ring member is fabricated as described above; and a second oil ring member is fabricated having a first compression flange, a second flange, and an interconnecting web having transverse ports between the two flanges. Circumferentially overlapping fingers are not necessary on this second ring member as they were with the first ring member, but they may be provided. The compression flange is provided with a top planar face and an outer cylindrical edge face, with this flange being joined to the first compression ring member by means of a localized silver solder joint. The outer edge face of the second flange is finished to a smaller diameter than the outer edge face of the compression flange, in order to provide a clearance space between the second flange and the cylinder wall.

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First Claim