In this type of bearing, the cylindrical rollers are in linear contact with the raceways. The outer ring full complement bearing has a high radial load capacity and is suitable for high speed. There are different types designated NU, NJ, NUP, N, NF (for single row bearings), NNU and NN (for double row bearings, depending on the design or without side ribs). All types of outer and inner rings are separable. Some cylindrical roller bearings have no ribs on either the inner or outer rings, so the rings can move axially relative to each other. These can be used as free end bearings. Full-roller bearings without outer ring, with two ribs on the inner or outer ring and one rib on the other ring, can withstand a certain axial load in one direction. Double row cylindrical roller bearings have high radial stiffness and are mainly used for Precision machine tools. Often pressed steel or machined brass cages are used, but sometimes molded polyamide cages are also used. Types NU, N, NNU and NN are suitable as free end bearings. Types NJ and NF can withstand limited axial loads in one direction. Types NH and NUP are available as fixed end bearings. Full complement of roller bearings without outer ring consists of NJ type full complement of roller bearings without outer ring and HJ type L-shaped thrust ring. The inner ring rib of the NUP type cylindrical roller bearing should be installed with the mark facing outward. Cageless full complement cylindrical roller bearings have as many rollers as possible and can handle heavier loads than caged cylindrical roller bearings of the same size. On the other hand, the high-speed capability is not as good as a caged bearing. Open single-row and double-row bearings are mostly used for general industrial applications with low speed and heavy loads, while shielded double-row bearings are mostly used for crane pulleys. Improved Sealing: The contact seal increases resistance to the ingress of water or foreign objects. High load carrying capacity: When used as a pulley bearing, increases radial and axial load carrying capacity. Corrosion resistance: Phosphate surface treatment improves rust resistance. Easy to apply grease: The holes in the inner ring allow for easy re-grease, even when the bearing is mounted. Fewer peripheral parts: With a snap ring on the outer ring, fewer parts are required around the bearing, making the pulley more cost-effective. A full complement of roller bearings without an outer ring consists of an outer ring with spherical raceways, an inner ring with double raceways, one or two cages and a set of spherical rollers. Spherical roller bearings are self-aligning, allowing shaft and housing misalignment. This bearing type can withstand heavy radial loads, axial loads in both directions, and even vibration. Full complement of outer ring bearings are designed to accommodate misalignment between the inner and outer rings or the shaft and housing without performance degradation. Under normal load and operating conditions (C/P>10), and constant misalignment, the allowable misalignment angles are shown in the table below. In some cases, the misalignment error is variable, for example: a shaker can cause a rotational imbalance, so the angle of shaft deflection is also rotating. In paper processing, the rollers compensate for deflection when the fixed shaft is bent. Under these conditions, the bearing generates additional sliding forces. Taking into account the heat generated by friction, the misalignment error should be less than 1 degree. Sealed spherical roller bearings only allow misalignment errors of less than 0.5 degrees. Below this value, the seal will not be damaged.
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