The size of the roll bearing is limited by the installation space of the rolling mill (the inner diameter of the bearing, the outer diameter of the thrust washer depends on the diameter of the roll neck and the roll body), the smaller the cross section of the bearing is and belongs to thin-walled bearings and they must also withstand larger Radial load, so the use of multi-row roller bearings.

    At present, the main four-row cylindrical roller bearings and four rows of tapered roller bearings, also used double row cylindrical roller bearings, double row tapered roller. Tapered roller bearings are mostly hollow roller and column cage, in order to improve the bearing lubrication conditions, the bearing outer surface and end aluminum alloy bearing surface were opened with oil grooves and oil holes, when the gap with the roll neck hydraulic oil-free When the bushing is matched, a helical oil groove is formed on the inner hole surface of the bearing inner ring.

    Roller bearing structure is based on different types of mills, different working conditions and different configuration of the structure to decide. In general, the four-row cylindrical roller bearings easy access to high precision machining, it has high-speed rotation characteristics, but also because of its easy installation and removal, and can roll in the inner ring into the roll after the inner raceway roller and roll Surface simultaneous grinding, help to improve the rolling precision, and more for high-speed, high-precision rolling mill bearing roller, four rows of tapered roller bearings carrying capacity, can simultaneously bear radial and axial load, suitable for low speed and medium speed rolling mill.