Cylindrical rollers and raceways are linear contact bearings. Load capacity, mainly bear radial load. The friction between the rolling element and the rib of the ring is small, which is suitable for high-speed rotation. According to the absence of ribs on the ring, it can be divided into single-row cylindrical roller bearings such as nu, nj, nup, n, and nf, and double-row cylindrical roller bearings such as nnu and nn. Cylindrical roller bearings have a separable inner ring and outer ring. The models of cylindrical roller bearings are: fag nup210-e-xl-tvp2, fag nu218-e-xl-mpax-c3, etc. Generally, a steel stamping cage is used, or a copper alloy turning solid cage is used. However, there are also some types and models of cylindrical roller bearings using polyamide formed cages. The three most common types are single-row cylindrical roller bearings, double-row cylindrical roller bearings, and four-row cylindrical roller bearings. There are some differences in the structure of these three types of bearings. 1. Features of single-row cylindrical roller bearings (1) The roller and the raceway are in line contact or trimmed line contact, and the radial bearing capacity is large, which is suitable for bearing heavy loads and impact loads. (2) Single-row cylindrical roller bearings are divided into n-type, nu-type, nj-type, nf-type and nup-type according to the different rib of the ring. (3) The friction coefficient is small, suitable for high speed, and the limit speed is close to that of deep groove ball bearings. (4) The n-type and nu-type can move axially, which can adapt to the change of the relative position of the shaft and the shell caused by thermal expansion or installation error, and can be used as free end support. (5) The processing requirements for the shaft or seat hole are high, and the relative deflection of the outer ring axis after the bearing is installed should be strictly controlled to avoid contact stress concentration. (6) The inner ring or outer ring can be separated for easy installation and removal. 2. Characteristics of double-row cylindrical roller bearings (1) Double-row cylindrical roller bearings have the advantages of compact structure, high rigidity, large bearing capacity, and small deformation after being loaded. The conical inner hole can also play the role of micro-adjustment of the clearance, and can simplify the structure of the positioning device and facilitate installation and disassembly. (2) Cylindrical roller bearings without ribs on the inner ring or outer ring, the inner ring and the outer ring can move relative to the axial direction, so they can be used as free end bearings. Cylindrical roller bearings with double ribs on one side of the inner ring or outer ring and a single rib on the other side of the ring can withstand a certain degree of axial load in one direction. (3) Double row cylindrical roller bearings are divided into two types: cylindrical bore and tapered bore. They have high rigidity to radial loads and are mainly used for machine tool spindles. 3. Features of four-row cylindrical roller bearings (1) Four-row cylindrical roller bearings have conical inner and outer raceways, and the tapered rollers are arranged in between. The projected lines of all conical surfaces meet at the same point on the bearing axis. This design makes tapered roller bearings particularly suitable for combined (radial and axial) loads. The axial load capacity of the bearing is mostly determined by the contact angle α; the larger the α angle, the higher the axial load capacity. The size of the angle is represented by the calculation coefficient e; the larger the value of e, the larger the contact angle, and the greater the applicability of the bearing to bear the axial load. (2) Four-row cylindrical roller bearings can withstand large radial loads and impact loads, have high machining accuracy, and are suitable for high speeds. Most of them are used on the rolls of rolling mills, but they can also be used in other occasions. In addition, fc, fcd, fcdp type four-row cylindrical roller bearings can withstand large radial loads, and are mostly used in heavy machinery such as rolling mills.
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