Kabushiki Kaisha Riken

Ko Chiba

Sumio Ono

Yoshiaki Wada

Hiroshi Miida

Yukio Ikeda

Yoneo Kawauchi

Hajime Yamauchi

The annular expander of a piston ring assembly with vertically extending notches each of which is formed on either side of a plurality of circumferentially spaced upstanding tabs projecting from the top and bottom edges of the expander. The tabs, which form the abutments for the inner peripheral edges of upper and lower annular side rails, the outer peripheral edges of which are in sliding contact with a cylinder wall, undergo elastic deformation made possible by the notches when the corresponding side rails are subjected to a strong force received from the cylinder wall owing to piston wobble during reciprocation. The elastic deformation of the tabs assures that the side rails will remain in contact with the cylinder wall at all times during the reciprocation of the piston.

Corrugated expander for piston ring assembly

A piston ring assembly including a pair of rails engageable with a cylinder wall and a spacer and expander member for holding and expanding the rails. The spacer and expander member has a corrugated base and arms extending alternately upwardly and downwardly from lower and upper crowns of the corrugated base, which arms are inclined radially outwardly to provide an improved resilient spring-like action to the rails supported on the crowns.

Spacer and expander member for holding and biasing piston ring rails

Growing community of inventors

Kashiwazaki, Japan

Ko Chiba