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Types and characteristics of radial cylindrical roller bearings

by:JNSN     2021-12-27
Compared with other bearing designs, radial cylindrical roller bearings can provide higher radial load carrying capacity. Timken offers a variety of full complement, single-row, double-row and four-row bearing designs to meet various application requirements. The standard type of radial cylindrical roller bearing Timken® cylindrical roller bearing consists of an inner ring, an outer ring, a cylindrical roller cage and a set of cylindrical rollers with a contour design. Different types of bearings will have ribs for guiding the cylindrical rollers on both sides of the inner ring or the outer ring, and the other bearing ring is separable and has one side rib or no rib. The bearing ring with ribs on both sides can position the cylindrical roller assembly in the axial direction. The ground ribs can support cylindrical roller cages. When the other bearing ring also has ribs on different sides, this rib can bear a lighter axial load. The installation process of the application is usually taken into consideration to determine which bearing ring adopts the double rib structure. NU type: The bearing has a double rib outer ring and an inner ring without ribs. N-type bearings have inner rings with double ribs and outer rings without ribs. No matter what type of bearing is used in which position on the shaft, expansion and contraction of the shaft are allowed. When the bearing rotates, one bearing ring is axially displaced relative to the other bearing ring, and the friction force is very small at the same time. If other axial positioning methods are provided, cylindrical roller bearings can be provided at both ends of the shaft for support. Type NJ: The bearing has a double-ribbed outer ring and a single-ribbed inner ring. NF type bearings have a double-ribbed inner ring and a single-ribbed outer ring. Both types can withstand larger radial loads as well as lighter unidirectional axial loads. During sliding, the axial load is transmitted between the diagonal ribs of the inner and outer rings. When approaching the ultimate thrust, lubrication will be critical. This type of application requires assistance from Timken engineers. When the axial load is very light, the bearings are installed in a relative manner to achieve shaft positioning. At this time, the shaft end clearance should be adjusted during installation. NUP type: The bearing has a double-ribbed outer ring and a single-ribbed inner ring with an external flat retaining ring, which can provide bidirectional axial positioning. NP has a double-ribbed inner ring and a single-ribbed outer ring with an external flat retaining ring. Both types can withstand larger radial loads and lighter bidirectional axial loads. The axial load carrying capacity factor is the same as that of NJ and NF type bearings. For shaft expansion applications, NUP or NP bearings can be used in conjunction with N or NU bearings. In this case, N or NU bearings can allow shaft expansion. NUP or NP type bearings are fixed-end bearings, and ribs restrict the axial movement of the rolling elements. The fixed end bearing is usually close to the drive of the shaft to reduce the amount of eccentricity change. The shaft end clearance (or floating) is determined by the axial clearance of the fixed end bearing. The flat retaining ring (thrust ring) and the upper/lower diameter of cylindrical rollers of NU, N, NJ, NF, NUP and NP type bearings comply with ISO and DIN standards. The type of cylindrical roller bearing complies with the ISO 15 standard. It consists of four digits, the first two digits indicate the size series, and the last two digits are the value obtained by dividing the inner diameter size by 5. In the dimension series, the first digit is the width series, and the second digit is the diameter (outer diameter) series. The width series increases the width in the order of 80 1 2 3 45 6 7 and the diameter series increases the radial section in the order of 7 8 9 0 1 2 3 4. Bearing types with the R prefix are structurally similar to N-type bearings, but they are designed in accordance with ABMA standards. Inch size bearings have an I letter in the designation. For example, RIU means inch bearing, and RU means the corresponding model of metric size. NU, RIU, RU N, RIN, RN NJ, RIJ, RJ NF, RIF, RF NUP, RIT, RT NP, RIP, RP Figure 1. Radial cylindrical roller bearings. Double-row bearings: Compared with traditional single-row bearings, double-row or two-row cylindrical roller bearings provide higher radial load carrying capacity. This type of bearing is interchangeable, so the lower diameter of the (NNU type) roller and the upper diameter of the (NN type) roller conform to ISO/DIN standards. The standard cage adopts finger pocket design. Four-row bearings: Four-row cylindrical bearings have extremely high radial load capacity, but do not have axial load capacity. This type of bearing is mainly used in metallurgical roll necks and work rolls, with straight and tapered bore designs, respectively. Figure 2. The degree of 5200 metric series bearings should not be lower than HRC58, and the surface roughness should be less than 15 RMS. The W logo in the suffix indicates that it has an outer ring. In addition, the inner ring can also be equipped separately. The prefix A indicates that the inner ring is equipped separately or as part of a complete set of bearings. This kind of bearing usually has a strong stamped steel cage (S mark), guided by the outer ring rib. The center of the beam of the cage is recessed, which not only evenly isolates the cylindrical rollers, but also integrates them with the outer ring. The machined brass (M logo) cage is suitable for applications where the load is reversed or at higher speeds. The outer ring is made of high-quality alloy steel for bearings. The inner ring is deep-hardened and can withstand the ring pressure stress caused by a higher interference fit. The specified radial clearance of standard bearings is R6, and other internal clearances can be provided upon request. The integrated ribs on the outer ring and the control of the roller end gap can ensure proper roller guidance. A-52xx-WS A-52xx-WM 52xx-WS A-52xx EMA series: Timken® single row EMA series cylindrical roller bearings have a unique cage design, original internal geometry and special surface treatment. These features help to improve bearing performance, extend running time and reduce maintenance costs. The cage adopts a one-piece brass design and the pockets are fully polished.
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