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Rolling bearings support and guide rotating or oscillating machine elements – such as shafts, axles or wheels – and transfer loads between machine components. They provide high precision and low friction and therefore enable high rotational speeds while reducing noise, heat, energy consumption and wear.

Cylindrical Roller Bearings

Roller bearings — also known as rolling-element bearings — are similar to ball bearings in that they are designed to carry a load while minimizing friction. However, roller bearings transmit loads using cylinder rolling elements, rather than balls, to maintain the separation between moving parts of the bearing. These versatile bearings can contain single or multiple rows of rolling elements; multiple rows can significantly improve radial load capacity. Also, the use of different roller shapes can further reduce friction and support both radial and axial loads.

Roller bearings are used in rotary applications to replace sliding movement with low friction, rolling. Automated roller bearing setting techniques offer many advantages like reduced setting time, assembly cost, and reliable setting. To select the right roller bearing, one must determine the desired bearing life and a sufficient basic dynamic load rating to meet that life requirement. Roller bearings are used in power generation, wind turbines, gear drives, rolling mills, machine tool spindles, gear reduction units, etc.

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Cylindrical roller bearings use cylinders as rolling elements, unlike balls in ball bearings. The cylindrical roller bearings are in linear contact with the raceways in bearings of this type. They have a high radial load capacity and are suitable for high speeds. There are different types designated as NU, NJ, NUP, N, NF (for single-row bearings), NNU, and NN (for double-row bearings depending on the design or absence of side ribs).

Applications of Cylindrical Roller Bearings :

Cylindrical Roller Bearings are widely used in multiple industries, including pumps and compressors, mechanical presses, electric motors, gearboxes, traction motors, axle bearings for railway vehicles, steelworks, and many other industrial applications. The combination of high load capacity, moderate speed rating, and industry interchangeability make it one of the most popular bearing designs.

Classification of Cylindrical roller bearings

The outer and inner rings of all types are separable. Some cylindrical roller bearings have no ribs on either the inner or outer ring so that the rings can move axially relative to each other. These can be used as free-end bearings. Cylindrical roller bearings, in which either the inner or outer rings have two ribs, and the other ring has one, can take some axial load in one direction Double-row cylindrical roller bearings have high radial rigidity are used primarily for precision machine tools. Pressed steel or machined brass cages are generally used, but sometimes molded polyamide cages are used.

(1) Single row cylindrical roller bearings

Single row cylindrical roller bearings are a kind of cylindrical roller bearings manufactured with snap ring grooves on the outer rings. This design simplifies the bearing joint as the bearings are located in the housing using the snap rings.

These single-row cylindrical roller bearings feature separable bearing rings, rollers, and cage assembly units. The design helps simplify mounting and dismounting, particularly when load conditions require both rings to have an interference fit.

Single row cylindrical roller bearings Features:

-Wide variety of configurations

-Multiple cage designs

-Industry-standard and special features

-Available in ISO metric and inch formats

-Customizable to meet specific application requirements.

Applications of Single row cylindrical roller bearings:

Single Row Cylindrical Roller Bearings are designed to support heavy radial loads and are some of the most common bearings used worldwide. These roller bearings consist of an Outer Race, Bronze or Steel Cage, a complement of rollers, and usually an Inner Race.

The use of Single row cylindrical roller bearings has benefited many industries:

-pumps and compressors

-mechanical presses

-electric motors


-traction motors and axle bearings for railway vehicles

-steelworks and in many other industrial applications.

(2) Double row full complement cylindrical roller bearings

Double row full complement cylindrical roller bearings are designed to withstand heavy loads. A double row full complement cylindrical roller bearing is a cylindrical roller bearing. Under the same width, this kind of bearing has a very high load carrying capacity compared with the traditional bearing with a cage, the radial section is small, and it can save space, but the speed is relatively low.

Double row full complement cylindrical roller bearings can withstand large radial loads and axial loads and withstand overturning moments. Therefore, the length is used as a fixed bearing. If several bearings are installed on a shaft, the outer ring can have different rotation speeds because the outer ring is narrower than the inner ring. To make the pulley easy to fix to the outer ring of the bearing, there are annular grooves on both ends of the outer ring that can be fitted with elastic retaining rings. This is somewhat suitable for the pulley mechanism.

Double row full complement cylindrical roller bearing application

Double row full complement cylindrical roller bearings are industry interchangeable with like size numbered bearings and are used in accumulator sheaves, gearboxes, and walking beam furnace eccentrics.

(3) Cylindrical roller bearings with spacers

Cylindrical roller bearings with spacers are a type of cylindrical roller bearings. The Spacer ring is an annular part that maintains a specified axial distance between two bearing rings or bearing washers. In cylindrical roller bearings, plastic spacers prevent the cylindrical rollers from coming into contact during rolling. The spacers are designed such that the rolling element set is self-retaining, so the bearing and inner ring can be mounted separately. The spacers are guided axially between the two outer ring ribs. These types of bearings are without seals.

Cylindrical roller bearings with spacers application

Cylindrical roller bearings with spacers are widely used in mining, petroleum, heavy machinery, wind power, engineering machinery, and other industries.

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