Several components of cylindrical roller bearings are profiled, including the end faces of the Rolling elements
Main component of a rolling bearing. They move along the bearing raceway and are enclosed by the cage. They are categorised according to design and type of rolling contact (point and line contact).
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The rolling elements roll on the bearing raceway. It can be found on the inner ring as well as on the outer ring.
Main component of a rolling bearing. The inner ring can be mounted on an axle or shaft.
Main component of a rolling bearing. The outer ring can be mounted into a housing.
Main component of a rolling bearing. The cage guides the rolling elements in the bearing, keeps them an equal distance from each other and prevents them from touching.
The rolling bearing creates a low-wear and low-friction rotary connection between two components moving relative to each other.
So far, so good. But what other special features do cylindrical roller bearings have? On the one hand, it is worth mentioning that they have a higher Load rating
Important parameter that is specified in catalogues. It is also a parameter with which the service life of rolling bearings can be calculated.
A disadvantage in direct comparison with ball bearings is that cylindrical roller bearings have lower limiting speeds due to the line contact of the rolling elements. Furthermore, cylindrical roller bearings are significantly more sensitive to Shaft deflection
Bending deformation of the shaft due to an external force or moment load.
Angular errors that occur when bearings are not aligned with each other. These must be compensated for by a suitable bearing.
Number of revolutions min-1 of a rotating body in a given time.
Rolling bearings are usually lubricated with grease or oil to minimise friction and wear.
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Basically, the designation of cylindrical roller bearings starts with the letter N. Types NU and N are typically used as non-locating bearings and are not suitable for axial loads, as they only have ribs on one bearing ring. Cylindrical roller bearings with the designations NJ and NF can support axial loads from one direction and types NUP and NH are even suitable for axial loads from both directions. However, the axial load should be kept low, otherwise the rollers will generate excessive contact pressure with the lips. These types can then be used as fixed bearings for the shaft.
Have you ever heard of the Ultage series? Ultage bearings from NTN are a further development of standard bearings, for example cylindrical roller bearings. These not only have larger rolling elements and a generally optimised roller profile, but also profiled raceway surfaces. Due to this profiling, bearings of this series are characterised by larger permissible misalignments than the original cylindrical roller bearings. These features mean that the service life, dynamic load carrying capacity and also the limiting speeds are higher compared to the standard bearings.
The main difference between roller bearings and ball bearings is the type of rolling element used. Roller bearings use cylindrical rollers, while ball bearings use balls. Because of this, roller bearings can carry heavier loads and are better suited for applications where there is heavy radial or thrust loading.
Additionally, roller bearings typically have a higher load-carrying capacity and a lower speed rating than ball bearings. On the other hand, ball bearings are better suited for applications where there is high speed and low to moderate loading.
One of the most notable differences between roller bearings and ball bearings is that roller bearings are typically more expensive than ball bearings. However, they offer several advantages, including higher load-carrying capacity and increased accuracy.
Bearing size is an important aspect of roller bearings and several factors determine the size of a roller bearing. These factors include the diameter of the shaft it will be mounted on, the bore diameter of the bearing, the outside diameter, and the width of the bearing.
The bore diameter is the inner diameter of the roller bearing and is typically measured in millimetres (mm). The width of the bearing is the distance between the outer races of the bearing and is also measured in millimetres.
To determine the proper size of a roller bearing where the shaft is the rotating element and the outer ring has a transition fit, the diameter of the shaft it will be mounted on must be known. The diameter of the shaft must be larger than the bore diameter of the bearing, as the bearing must fit snugly over the shaft. A tight fit is needed to prevent the bearing from rotating on the shaft, which could cause damage to the bearing and reduce its lifespan.
On the other hand, if the outer ring is rotating, then the housing must have a smaller diameter than the outer ring, and the shaft will have a transition fit.
In addition to the bore diameter and width, the load capacity of the bearing must also be considered when selecting the right size. The load capacity of a roller bearing is determined by the type of bearing, its size, and its material. For example, larger bearings can typically manage higher loads than smaller bearings.
It's also important to consider operating conditions, such as speed and temperature, as these can affect the size and load capacity of the bearing. In high-speed applications, for example, bearings with a low friction coefficient and high load capacity may be needed.
To ensure the proper functioning and longevity of a roller bearing, it is crucial to select the proper size based on the specific application requirements. It is also essential to select the correct lubrication for the conditions.
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