Cylindrical roller bearings are usually guided by two ribs of a bearing ring, a cage, a roller and a guide ring form a combination, usually a separable bearing. This kind of bearing is relatively convenient to install and disassemble, especially when the inner and outer rings are required to have an interference fit with the shaft and the housing. Such bearings are generally only used to withstand radial loads, and only single-row bearings with ribs on both the inner and outer rings can withstand smaller axial loads or larger intermittent axial loads. Compared with deep groove ball bearings with similar dimensions, this type of bearing has a larger radial load capacity, and is also suitable for high-speed rotation from a structural point of view. The sub and the raceway adopt the convexity modification plan, which can eliminate the edge stress and improve the bearing life. The rib design has a certain skew angle, so the axial load it carries is larger than that of the conventional design. Cylindrical roller bearings without ribs on the outer ring or cylindrical roller bearings without ribs on the inner ring are full complement cylindrical roller bearings with two ribs on the outer ring and no ribs on the inner ring. A full-roller bearing without an outer ring has two ribs on the inner ring and no ribs on the outer ring. Cylindrical roller bearings of NU type and N type allow bidirectional axial displacement of the shaft relative to the bearing housing within certain limitations, that is, they can withstand the length change of the shaft caused by thermal expansion, so they are suitable as non-locating bearings. It can withstand large radial loads, but cannot withstand axial loads. NJ type and NF type cylindrical roller bearings can limit the axial displacement of the shaft or housing in one direction, realize one-way axial positioning, and can bear a small one-way axial load. Cylindrical roller bearings, the outer ring has double ribs, the inner ring has ribs on one side and a retaining ring on the other side. This type of bearing can be used for bidirectional axial positioning of the shaft and can withstand bidirectional axial force. The bearing layout is optional NUP...N. The NJ type cylindrical roller bearing with the inclined retaining ring HJ can be used as a locating bearing just like the NUP type cylindrical roller bearing. Generally, the layout of the outer ring with double ribs and the inner ring with a single block, that is, NJ...V, NUP...V, RNU...V, etc., is compared with the similar layout of the roller bearing with cage. The advantages of large rated load and simple layout. In the environment where the rotational speed and working temperature are not very high, the lubrication conditions are good, and the cleanliness of the box is relatively high, the full-roller layout should be preferred. The main dimensions of cylindrical roller bearings are the same as those of the ordinary type, but the diameter, length and number of rollers have increased, so the bearing capacity has also increased accordingly. This type of bearing is distinguished from other bearings by adding 'E' after the basic model. The diameter of the inscribed circle of the roller is different from that of the ordinary bearing, so it cannot be compared with the ordinary bearing.
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