TIMKEN four-row cylindrical roller bearings can only carry radial loads, therefore, an additional thrust bearing must be used to provide axial support. Housings are usually loose fit to facilitate disassembly for regular maintenance. The preferred fit for the shaft is a tight fit. In some applications, the shaft can also be loosely matched, such as some rough rolling equipment. If the shaft is loosely fitted, a lubricating oil groove should be integrated into the inner bore of the bearing inner ring. Consult a Timken engineer for more details on how to install a four-row cylindrical roller bearing. In order to facilitate disassembly, a relief groove (feature code W30B) can be added to the inner ring. Bearing inner rings can be ordered separately to suit the use of spare rolls. Bearing inner and outer ring assemblies can be interchanged to achieve a certain clearance value. The main design types are: optimization of rolling element and raceway geometry design, so that the bearing has a high radial load capacity. In addition, the structure of various cages and the selection of different materials enrich the bearing design, and the feature of preset clearance simplifies the installation process. Type RY Type RY bearings have two outer rings with three solid ribs. The inner ring is usually of one-piece construction. The outer ring assembly is composed of the outer ring, rolling elements and cage, which is an integral combined structure. This design makes bearing handling simple and easy. There are loading grooves on the bearing for mounting the rolling elements. Under normal circumstances, the lubricating oil is used to lubricate the bearing through the groove on the end face of the outer ring. The cage is of one-piece construction, and the material is machined brass or steel. The pockets of the cage are staggered between the inner and outer raceways. The RX type bearing is a four-row structure with two outer ring ribs and some side retaining rings to ensure the distance between the rolling element rows. This will make disassembly and inspection easier. Type RX designs are commonly found on bearings with an inner diameter greater than 400 mm. Both brass cages and pin cages are available for this bearing type. In most cases, the bearing inner ring is two-piece. Types RYL and RXL The latest RYL and RXL are available in a wide range of sizes up to an inner diameter of up to 340 mm and are specially designed for long product mills. The steel cage and the optimization of the design maximize the service life of the bearing, prevent the rolling elements from falling off, and also facilitate the handling of the bearing.