| 摘要 |
PROBLEM TO BE SOLVED: To achieve the high accuracy of rotation by controlling an instable vibration like a whirl and the like, and also by suppressing a shaft dislocation. SOLUTION: A bearing face opposing a sliding face of a shaft to be held via the gap of a bearing is formed at a bearing body made of a porous material, and an inclining dynamic-pressure groove is formed at the bearing face. Openings including the dynamic-pressure groove are distributed at the bearing face, and the ratio of a surface area of the openings is 2 to 20 percent. The sliding face of the shaft is floated and held by a dynamic-pressure oil film of oil lying in the gap of the bearing.
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