Kabushiki Kaisha Riken

Other

Satoshi Koizumi

Hiroshi Shimizu

Yuichiro Takezawa

Masahiro Nakazawa

Tadahiko Watanabe

Shigeru Tokunaga

Kenichi Sudou

An oil control ring according the present disclosure includes a pair of side rails, and a spacer expander disposed between the pair of side rails. The spacer expander includes a plurality of sets and each set includes a lug part and a rail facing part. For each set, the lug part is in contact with an inner circumferential surface of either of the pair of the side rails, and the rail facing part is provided adjacent to the lug part and faces a side surface of either of the pair of the side rails. The lug part satisfies a following condition (1):&#x2265;1.5&#x2003;&#x2003;(1)In condition (1), W indicates a width of the lug part at a position 0.05 mm away from a highest position of the lug part in a direction towards the rail facing part, and H indicates a height difference between a highest position of a region on the rail facing part adjacent to the lug part and the highest position of the lug part.

Oil control ring and spacer expander

Spacer for internal combustion engines

To provide a combined oil control ring with a function of preventing the separate rotation of side rails for a long period of time even under fretting fatigue, seating tabs of a spacer expander are provided with substantially longitudinal projections and recesses on their side-rail-pushing surfaces in a circumferential direction, the width m of a bottom surface being larger than the circumferential length m' of the top surface in each projection, and a surface connecting the top surface to a recess surface having a bulging shape.

Combined oil control ring

Growing community of inventors

Kashiwazaki, Japan

Satoshi Koizumi