Japan National Oil Corporation

Akio Nishiyama

Osamu Nakamura

Kazutaka Kanda

Masahiro Arai

Kunio Komaki

A bit apparatus in which a cutter member having cutting teeth is axially supported on a shaft for rotation about the shaft, and a bearing mechanism is interposed between the cutter member and the shaft. The bearing mechanism includes at least a radial bearing for bearing a radially directed load and a thrust bearing for bearing an axially directed load. The radial bearing has a shaft-side split bearing member and a cutter-side split bearing member that are opposed to or in sliding contact with each other and capable of rotating relative to each other.

Growing community of inventors

Saitama-ken, Japan

Akio Nishiyama