SEALED FOUR-ROW TAPERED ROLLER BEARING FOR WORK ROLL OF ROLLING MACHINE

PROBLEM TO BE SOLVED: To provide a roller bearing capable of being universally employed for various purposes and lubrication modes, reducing abrasion, and having good heat radiation by forming grooves or voids extended in the radial direction on at least one of facing contact end faces of two inner ring portions. SOLUTION: The facing end faces 17, 18 of inner ring portions 1, 2 are kept in direct contact with each other, and multiple radial grooves 19 are provided on the end faces 17, 18 distributively in the peripheral direction. The separation/ connection section between the end faces 17, 18 is sealed by a seal ring 20 made of rubber or a plastic, for example. The lubricant in the radial grooves 19 lubricates the inner ring end faces 17, 18 relatively rotated during operation and/or the gap between the inner periphery 36 of the inner ring portions 1, 2 and a journal 37, and it also seals a bearing chamber 28 from the journal 37. The heat generated in a bearing can be discharged to the end faces 17, 18 through the grooves 19, the operation state of the bearing is kept satisfactory, and the life of the bearing can be extended.