Kabushiki Kaisha Riken

Kabushiki Kaisha Rikon

Miyuki Usui

Masahiro Nakazawa

Nobuo Katayama

In mounting a combined oil control ring in a ring groove formed in a piston, the combined oil control ring is mounted in a form that an opening between but ends of an oil ring body is widened. In such an operation, it is likely that a coil expander falls off the oil ring body thus making the mounting operation cumbersome. To overcome such a drawback, a relationship L&#x3c;Lis established. Here Lmeans a axial distance between open peripheries of the groove portion and Lmeans a maximum axial distance between peripheries of the groove portion.

Combined oil control ring

In a combined oil ring having a spacer expander to be installed between a pair of upper and lower side rails, a plurality of axially protruding inner peripheral protruding portions are formed on the inner peripheral side of the spacer expander along its peripheral direction. The inner peripheral protruding portions press the inner peripheral surface of the side rails. On the outer peripheral side of the spacer expander, a plurality of slits are formed, and a plurality of connecting portions are located in the peripheral direction isolated by the slits. On the plurality of connecting portions, axially protruding outer peripheral protruding portions are formed.

Growing community of inventors

Kashiwazaki, Japan

Miyuki Usui