Kabushiki Kaisha Riken

Other

Yuichiro Takezawa

Hiroshi Shimizu

Tatsuya Miyajima

Satoshi Koizumi

Shigeru Tokunaga

Kenichi Sudou

Yasuhiro Iwata

Provided is a side railhaving an outer peripheral surface, an inner peripheral surface, a first axial side surface, and a second axial side surfaceparallel to the first axial side surface, in which, a beveled portionis provided between the outer peripheral surfaceand the second axial side surface, the beveled portionis formed in a tapered surface having a diameter gradually decreasing from the first axial side surfacetoward the second axial side surface in an axial direction; a tapered surfaceis provided between a first tapered surface portionwith an angle of 10&#xb0; or more to the axial direction and a second tapered surface portionprovided between the first tapered surface portionand the outer peripheral surfaceand having a smaller angle of inclination to the axial direction than that of the first tapered surface portion.

Side rail

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

A side rail () is formed in a sprit ring shape with an opening () and to be mounted on a space expander () in an annular shape 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 a crankcase, a second axial surface () facing a combustion chamber and parallel to the first axial surface (), and a protrusion () formed on the outer peripheral surface () in a position offset from an intermediate position between the first axial surface () and the second axial surface () toward the first axial surface () and protruding radially outward from the outer peripheral surface ().

Growing community of inventors

Tokyo, Japan

Yuichiro Takezawa