Cylindrical Roller Bearings- Single Row / Double Row / Four Row
Cylindrical roller bearings are ideal for high radial load and heavy impact. Since rollers and raceways are in linear contact they can bear high loads. Cylindrical bearings have separable inner and outer rings.
Cylindrical roller bearings come in different conventional designs N, NU, NN, NNU, NJ, NF, NUP, NH. These bearings are available in Single Row Cylindrical Roller Bearing, Double Row Cylindrical Roller Bearings, and Four Row Cylindrical Roller Bearings.
Types of Cylindrical Roller Bearings
Single Row Cylindrical Roller Bearing
- Single-row cylindrical roller bearings are rigid and can support large radial loads. They can also be used at high speeds.
- There are many designs and types of single-row cylindrical roller bearings.
- N, NJ, NU and NUP are the most popular models. The most important difference is in the arrangement of the ribs.
- In NU type cylindrical roller bearing, the outer ring consists of two rigid ribs, while the inner ring has no ribs. The NU type cylindrical roller bearings can be used as non-locating bearings. They cannot guide the shaft in any direction.
- In NUP type cylindrical roller bearing, there are two rigid ribs on either side and one loose rib washer on the inner ring. Bearings of the NUP type cylindrical roll bearing are used to locate the shaft in both directions.
Double Row Cylindrical Roller Bearing
- Double-row cylindrical roller bearings are ideal for heavy radial loads, due to their high load capacity and rigidity.
- The interchangeability of double-row cylindrical roller bearings allows for mounting and dismounting as well as maintenance inspections.
- A double row cylindrical bearing is typically used in rolling mills, gear drives, crop shear and machine tools.
Four Row Cylindrical Roller Bearing
- Four-row cylindrical roller bearings are suitable for very high radial loads due to a large number of rolling elements.
- Four-row cylindrical roller bearings are only designed to accommodate radial loads. They can be mounted with either deep groove or angular contact ball bearings or with tapered roller bearings (radial or thrust) that can support axial loads.
- The four-row cylindrical roller bearings are primarily used for heavy machinery, such as for supporting rollers in rolling mills, calenders and roller presses.
Features And Benefits Of Cylindrical Roller Bearings
- Since the design allowing linear contact of cylindrical rollers with the raceway provides strong resistance to radial load, this type is suitable for use under heavy radial load and impact load, as well as at a high speed.
- N and NU types are ideal for use on the free side. They are movable in the shaft direction in response to changes in bearing position relative to the shaft or housing, which are caused by heat expansion of the shaft or improper mounting.
- NJ and NF types can accommodate axial load in one direction.
- NH and NUP types can accommodate partial axial load in both directions. With a separable inner and outer ring, this type ensures easy mounting.
- NNU and NN types are widely used in machine tool spindles due to their high rigidity.
- Cylindrical Roller Bearings are ideal for applications where the rolling speed is high.
Uses And Application Of Cylindrical Roller Bearings
- The accuracy and construction of Cylindrical roller bearings are such that it is suitable for high speed and heavy load applications in steel, power, automotive, and other heavy industries.
- The four-row cylindrical roller bearings are most commonly used on rolling mill stands, calenders, and roller presses.
Cylindrical Roller Bearing Size Chart
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