ROLLING BEARING DEVICE, AND BACKUP ROLL FOR ROLLING MILL INCLUDING THE ROLLING BEARING DEVICE

摘要

A rolling bearing device of the present invention includes a sealing device, which closes an opening of a first circular space between an inner ring member and an outer ring member. The sealing device includes a metal core. On the metal core, a vent hole which interconnects the first circular space and a second circular space to transfer pressure inside the first circular space to the second circular space. A second sealing rib is separated from a slinger when pressure inside the first circular space is higher than a predetermined pressure so as to transfer pressure inside the first circular space to the outside through the vent hole and the second circular space.