Patent ID: 8210753

Claim:
A cylindrical roller bearing device for rotatably supporting a roll which includes roll portions formed respectively at opposite axial sides of a shaft portion and made larger in diameter than said shaft portion and which can be expanded in an axial direction toward one axial side, the cylindrical roller bearing device comprising: an inner ring for fitting on said shaft portion; an outer ring disposed radially outwardly of said inner ring; cylindrical rollers disposed between said inner ring and said outer ring; and a bearing box supporting said outer ring, wherein said inner ring and said outer ring are movable relative to each other in the axial direction, wherein a first side face of said bearing box located at said one axial side is disposed outwardly with respect to a central line between said roll portions, disposed respectively at the opposite axial sides, than a second side face located at an other axial side, and wherein a gap between said first side face and said roll portion opposed thereto is set smaller than a gap between said second side face and said roll portion opposed thereto.