Abstract: A stationary sealing ring adapted to seal a grooved carrier and a circular housing is disclosed. The sealing ring includes a plurality of stacked, annular parted ring segments dimensioned to slip within the carrier groove and an expander which exerts a radial force on an inner face of each of the segments. The expander is configured to be spaced from the bottom of the groove under operating conditions.

Abstract: A two-piece oil control ring including a parted or split rail ring and a spacer-expander is disclosed. The spacer-expander includes a plurality of circumferentially spaced, cylinder wall engaging segments. Pairs of the segments are alternately interconnected by a generally vertical spring element and the remaining segments are interconnected by box sections. The spring elements are each bifurcated and further include reverse bent humps and a top rail stop. Each box section includes a first, bifurcated, generally vertical leg extending axially from the bottom inner radial edge of the ring, a second, slotless horizontal portion which defines a rail seat and a third, generally vertical pressure leg portion.

Abstract: A three-piece oil control ring including top and bottom rail rings and a circumferential spacer-expander is disclosed. The spacer-expander includes a plurality of spring elements interconnected by integral webs. Each of the spring elements is generally U-shaped in axial section and includes a top leg, a bottom leg and a base interconnecting the legs. The top leg defines a radial slot extending from the inner radial edge thereof along the entire radial length of the top leg. The bottom leg is slotless and the centroid of each spring element is located axially above the circumferential center line of the spacer-expander. A greater tension is exerted by the spring elements on the top rail ring than on the bottom rail ring.

Abstract: The disclosure embraces a piston ring particularly an oil control ring comprising a spacer-expander ring in association with one or more rails, ring segments or sealing rings wherein the spacer-expander ring component is configurated for preventing or minimizing necklacing during installation of the ring construction in the ring groove of a piston.

Abstract: The disclosure embraces a piston ring construction particularly an oil control ring construction comprising a parted oil control ring or rings and a parted compressible spacer-expander ring or spring member, the spacer-expander member configurated with strut portions, pairs of the strut portions having their end regions integrally joined by connectors, the connectors being formed with inwardly extending portions, the spacer-expander member being arranged to exert substantially uniform outward radial pressure against one or more oil control rings, the spacer-expander member being adapted to accommodate a latch member for bridging the ends of the member.