US 10,626,991 B2Granted

Segment, combination oil ring, and manufacturing method for a segment

AssigneeTpr Co., Ltd.

InventorsAtsushi Nakazawa, Hironori Fujita, Yusuke Nishi

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Abstract

Provided are a segment, a combination oil ring, and a manufacturing method for a segment, which are capable of preventing independent rotation of the segment while dealing with reduction in tension of the combination oil ring. Specifically, provided is a segment being slidable in an axial direction of a cylinder under a state in which an inner peripheral surface of the segment is pressed by ear portions formed in an expander spacer in a circumferential direction and an outer periphery side of the segment is pressed against an inner wall of the cylinder, in which the inner peripheral surface of the segment has at least two or more dross-projecting portions in the circumferential direction, and the dross-projecting portions have a projection height of from 4 μm to 25 μm.

Claims12

Dependent claims

A segment, which is slidable in an axial direction of a cylinder under a state in which an inner peripheral surface of the segment is pressed by ear portions formed along a circumferential direction of an expander spacer included in a combination oil ring for an internal combustion engine and an outer periphery side of the segment is pressed against an inner wall of the cylinder, the segment being made of metal as a material,

wherein the inner peripheral surface of at least one segment has a recessed groove having a recessed shape,
wherein dross-projecting portions having a mounded form are continuously formed along the recessed groove and on both sides of the recessed groove, and a plurality of pairs of dross-projecting portions each formed of the dross-projecting portions formed on the both sides are formed,
wherein the pair of dross-projecting portions is formed in a manner that metal of the recessed groove is melted on the both sides and thereafter cooled and solidified,
wherein the pair of dross-projecting portions has, at least at one position, a projection height of from 4 μm to 25 μm from the inner peripheral surface of the segment at a root of the dross-projecting portions, and
wherein the pair of dross-projecting portions is formed so as to incline in a first inclination direction with respect to a center axis direction orthogonal to a circumferential direction of the segment.

2 more elements

A combination oil ring, comprising:

an expander spacer having ear portions along a circumferential direction;
and
at least one segment being slidable in an axial direction of a cylinder under a state in which an inner peripheral surface of the segment is pressed by the ear portions and an outer periphery side of the segment is pressed against an inner wall of the cylinder, the segment being made of metal as a material,
wherein the inner peripheral surface of the segment has dross-projecting portions having a mounded form that are continuously formed along a recessed groove and on both sides of the recessed groove, and a plurality of pairs of dross-projecting portions each formed of the dross-projecting portions formed on the both sides are formed,
wherein the pair of dross-projecting portions is formed in a manner that metal of the recessed groove is melted on the both sides and thereafter cooled and solidified,
wherein the pair of dross-projecting portions has, at least at one position, a projection height of from 4 μm to 25 μm from the inner peripheral surface of the segment at a root of the dross-projecting portions, and
wherein the pair of dross-projecting portions is formed so as to incline in a first inclination direction with respect to a center axis direction orthogonal to a circumferential direction of the segment.

4 more elements

Dependencies are inferred from the claim text.