1.What is cylindrical roller bearing
The cylindrical roller bearing is one of the rolling bearings with cylindrical rollers as the core element, whose rolling elements are in line contact with the raceways of the inner and outer rings. Cylindrical roller bearings are designed to withstand high radial loads, compared with tapered or spherical roller bearings, the geometrical characteristics of cylindrical roller bearings make them outstanding in terms of pure radial load-carrying capacity, limiting speed, and friction control, but usually do not have axial load capacity.
Cylindrical roller bearings are composed of inner rings, outer rings, cylindrical rollers, and cages, some models (such as NU, NJ, etc. types) with inner and outer rings can be separate, thus easy to install and maintenance.
2.Types of Cylindrical Roller Bearings
(1)Single Row Cylindrical Roller Bearings Single row cylindrical roller bearings consist of an inner ring, an outer ring, a row of rollers and a cage, mainly used to withstand large radial loads, and can adapt to high-speed operation. Because it does not have the axial positioning function, some models of this bearing allow axial free movement and are suitable for working conditions where thermal expansion needs to be compensated.
(2)Double Row Cylindrical Roller Bearings Double row cylindrical roller bearings are composed of two rows of rollers, with higher radial load carrying capacity, and can withstand the axial load to a certain extent, suitable for high rigidity, high load mechanical equipment.
(3)Four Row Cylindrical Roller Bearings Four-rows cylindrical roller bearings are composed of four rows of rollers and a number of raceways, this type of bearing capacity is very high, mainly used to bear heavy radial load, but usually do not bear the axial load. Four row cylindrical roller bearings have high rigidity, excellent impact resistance, high load-bearing capacity, etc. advantages.
(4)Cylindrical Roller Bearings without Inner Ring Cylindrical roller bearings without inner ring eliminates the inner ring, roller rolling directly on the shaft, thus reducing the overall size of the bearing, improve load carrying capacity. These bearings are suitable for equipment where the shaft surface is hardened and precision machined, such as textile machinery, printing presses and hydraulic systems, to provide efficient support functions in limited spaces.
(5)Cylindrical Roller Bearings without Outer Ring Cylindrical roller bearings without outer ring, roller direct contact with the inner wall of the shell, reducing the volume of the structure, improve the load carrying capacity. This type of bearing is usually used in the shell with high-precision machining requirements, such as machine tools, gearboxes and special machinery and equipment.
3.Cylindrical Roller Bearing Characteristics
(1)High load carrying capacity: Cylindrical roller bearings have line contact between rollers and raceways, compared with the point contact of ball bearings, their contact area is larger, so they have a high radial load carrying capacity and are suitable for heavy-duty working conditions.
(2)Suitable for high speed operation: Cylindrical roller bearings are designed with low friction and smooth rolling of rollers, which can effectively reduce heat generation and improve running efficiency, so that they can maintain stable operation at high speed.
(3)Low friction and high wear resistance: Optimized roller end face design and cage structure reduces the internal friction, so that the cylindrical roller bearings in high load and high speed can still maintain a low temperature rise, prolong the service life and improve the stability of equipment operation.
(4)Separable structure, easy installation and maintenance: Most cylindrical roller bearings adopt separable structure, that is, the inner ring, outer ring and rollers can be installed or disassembled independently, which makes the replacement and maintenance of bearings more convenient, especially suitable for mechanical equipment that requires frequent disassembly and installation.
(5)Axial displacement compensation ability: Some models (such as NU, N-type bearings) allow axial displacement of the shaft relative to the bearing housing, which can compensate for the shaft elongation or contraction due to temperature changes, avoiding excessive axial force and improving system stability.
4.Cylindrical Roller Bearing Application
Cylindrical roller bearings are widely used in a large variety of industrial equipment and machinery due to their high radial load capacity, acceptable impact resistance, and suitability for high-speed working, especially heavy-duty, high-speed precision grinding and other strenuous applications.
(1)Machine tool industry: Cylindrical roller bearings are used in machine tool spindles in large quantities, with high rigidity and low friction characteristics that can improve the rotational precision of the spindle to ensure machining quality.
(2)Automobile and railroad industries: Cylindrical roller bearings are used in gearboxes, differentials, wheel bearings and other key parts to provide stable support and long life performance.
(3)Motor and power generation equipment: Cylindrical roller bearings are widely applied in high-power motors, wind generators, turbines and other equipment, with a capacity to bear heavy speed of rotation and complex loading conditions.
(4)Mining and metallurgical machines: Cylindrical roller bearings are used in heavy-duty machinery such as steel rolling mills, crushers, conveyors, etc. As the equipments need to bear extremely heavy radial loads and shocks, four-row cylindrical roller bearings are found to be an appropriate choice for increasing the load carrying capacity and life of the equipments.
(5)Paper, textile, shipping and other industries: Cylindrical roller bearings are also widely applied in paper machines, printing presses, textile machinery, ship transmission system and other machinery to meet the demands of high load and long operation.
