Tpr Co., Ltd.

Hironori Fujita

Atsushi Nakazawa

Yusuke Nishi

Kentaro Kawano

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 &#x3bc;m to 25 &#x3bc;m.

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

In a combination oil ring, when a line passing through a center of a segment width is a first intermediate line, a length of a line segment between a position on an engine combustion chamber side and a position on a side distant from the engine combustion chamber on a contour curve at a position at a distance of 3 &#x3bc;m from an outer peripheral vertex toward an inner peripheral side in a segment radial direction is L, and an intermediate line of the line segment L is a second intermediate line, the second intermediate line is located on the side more distant from the engine combustion chamber than the first intermediate line, and the outer periphery vertex of the segment is located on the second intermediate line or on the side more distant from the engine combustion chamber than the second intermediate line.

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Tokyo, Japan

Hironori Fujita