Hitachi, Ltd.

Shiro Matsui

Akira Yamaguchi

Kunio Takada

Yoshiaki Chiba

Kohji Aizawa

Shigenobu Nagasawa

In a ceramic bearing device having a ceramic bearing slidably supporting a sleeve fixed to a pump main shaft, a bearing case mounting the ceramic bearing and a bearing casing elastically supporting the bearing case with rubber, a cylindrical container is fixed to the bearing casing so as to surround the lower surface and the outer peripheral side of the bearing casing, a water storage tank having a return plate in the top end portion being fixed to the pump main shaft so as to surround the cylindrical container, a passage being provided in the cylindrical container, distance pieces being provided between the outer peripheral portion of the bearing casing and the inner peripheral portion of the cylindrical container being provided, a passage being formed in the distance piece.

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Chiyoda-machi, Japan

Shiro Matsui