Kabushiki Kaisha Riken

Hiroyuki Sugihara

Masaaki Fujita

Hiroyuki Yabune

A combined oil control ring comprising a pair of circular side rails each having a gap, and a waved spacer expander longitudinally sandwiched by the side rails, which has seating tabs for pushing inner surfaces of the side rails on the inner side, (a) the radial thickness aof the side rail being 50-90% of the height aof the spacer expander, or (b) the height aof the seating tab being 23-60% of the height aof the spacer expander.

Growing community of inventors

Kashiwazaki, Japan

Hiroyuki Sugihara