Kabushiki Kaisha Riken

Katsumi Murayama

Hiroshi Shimizu

A side rail () in a sprit ring shape is to be mounted on a space expander () and to constitute, together with the space expander (), a multi-piece oil ring () used in an internal combustion engine. The side rail () includes an outer peripheral surface () facing radially outward, an inner peripheral surface () facing radially inward, a first axial surface () facing one end of an axial direction, and a second axial surface () facing the other end of the axial direction and parallel to the first axial surface (). A bevelled portion () is provided between the outer peripheral surface () and the second axial surface () and formed in a tapered surface having a diameter gradually decreasing from a position on the outer peripheral surface () at 0.05 mm or more from the first axial surface () toward the second axial surface ().

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Tokyo, Japan

Katsumi Murayama