A cylindrical roller bearing is a bearing in which cylinders are utilized as rolling elements instead of balls like in ball bearings. The rollers have a greater linear contact area with the outer ring and can distribute loads across a broader surface. This type of bearing is designed to carry heavy radial loads.
Cylindrical roller bearings are made with a single row, two rows, or multi-rows of rolling elements. The different number of rolling elements is due to meeting an application’s radial load requirement.
Since they are available in a number of standard series and configurations, cylindrical roller bearings are widely used in many industries. The combination of moderate speed rating, industry interchangeability, and load capacity make it one of the most popular bearing designs.
The bearings are produced in ABMA series metric and inch, ISO series metric, Full Complement series, journal type, cluster mill sizes, and multi-row series. SUNBEARING applied the ISO series metric.
Cylindrical roller bearings are dimensionally interchangeable to same numbered and sized bearings in the industry. The components of journal bearings and other standard series are made to be interchangeable with other manufacturer’s components.
How Cylindrical Roller Bearings Work
Cylindrical roller bearings have a modified line contact with cylindrical inner and outer ring raceways, and the rollers are guided by ground ribs. This is either on the inner or outer ring.
The shape being a cylinder makes it available for the inner ring to have axial movement relative to the outer ring. This is significant when you are dealing with thermal expansion, it is when two of the rings should be press-fitted.
With this bearing type, the cylindrical rollers are in linear contact with the raceways. They also have a high radial load capacity which is ideal for high speeds.
Types of Cylindrical Roller Bearings
There are a number of types designated as NU, NJ, NUP, N, NF for single-row bearings and NNU and NN for double-row bearings. This is in accordance with the design or absence of side ribs. Both of the inner and outer rings of every type is separable.
Some cylindrical roller bearings come with no ribs on both the inner and outer ring. Because of that, the rings are able to move axially relative to each other. They can be used as free-end bearings.
The type of cylindrical roller bearing where either the inner or outer ring has two ribs, or the outer ring has one, can take some axial load in one direction. Double-row cylindrical roller bearings have high radial rigidity, these are usually used for precision machine tools.
Usually pressed steel or machine brass cages are used, but sometimes molded polyamide cages are employed.
Dependent on the existence of the ribs on their rings, cylindrical roller bearings are categorized by these types:
The types NH and NUP are used as fixed-end bearings, types NJ and NF can sustain limited axial loads in one direction, and types NU, N, NNU, and NN are good for free-end bearings.
NH-type cylindrical bearings possess the NJ-type cylindrical roller bearings and HJ-type L-shaped thrust collars. The inner ring loose rib of an NUP-type cylindrical bearing has to be mounted in order for the marked side to be on the outside.
SUNBEARING can provide all series of cylindrical roller bearing.
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