Installation Design and Matching of Full Complement Cylindrical Roller Bearings

Cylindrical roller bearings can only carry radial loads, so 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 meet backup roll application requirements. Bearing inner and outer ring assemblies can be interchanged to achieve a certain clearance value. The main design types are: the optimization of the geometry design of the rotating body and the raceway, so that the bearing has a very 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 an outer ring, a rotating body and a cage, which is an integral combined structure. This design makes bearing handling and handling simple and easy. There are loading grooves on the bearing for mounting the rotating body. 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 bearing is a four-row structure with two outer ring retaining rings and some side retaining rings to ensure the distance between the rotating body rows. This will make disassembly and inspection easier. The RX type design is more common in 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 new RYL and RXL are available in a variety of sizes, with ID values ​​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 rotating body from falling off, and also facilitate the handling of the bearing. Cylindrical roller bearings have cylindrical and tapered bores (two structures. There are mainly 2 types: NNU design and NN design. NN type design has double ribs on the inner ring and no ribs on the outer ring. NNU type design has no ribs on the inner ring and The outer ring has double ribs. The tapered hole structure can adjust the radial clearance during installation. The double row cylindrical roller bearing allows a certain axial displacement between the shaft and the bearing seat, and can be used as a Non-locating bearing. This type of bearing has the advantages of compact structure, high rigidity, large bearing capacity, and small deformation after being loaded, and is especially suitable for the support of machine tool spindles.

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