Cylindrical roller bearings Manufacturers online

Cylindrical roller bearings are characterized by high radial load carrying capacity and rigidity and are mainly used in gearboxes, electric motors and machine tools.

The selection of a suitable design, e.g. N, NU, NJ, NUP, depends on specific requirements such as axial guidance, displaceability and installation space. Full complement bearings offer a higher load carrying capacity, while bearings with a cage are suitable for higher speeds

Below you will find an overview of the function, design and construction types of cylindrical roller bearings, as well as an overview of their typical areas of application, their advantages and the challenges that need to be considered when using them:

How cylindrical roller bearings work:

1. The load is distributed by the contact of the cylindrical rollers with the raceways.
2. As the rollers have a larger contact surface than balls, they can support higher radial loads.
3. There are variants with or without guide edges on the rings, which influences the axial load capacity.

Structure of cylindrical roller bearings:

A typical cylindrical roller bearing consists of:

1. Inner ring - running surface for the cylindrical rollers, possibly with guide rims.
2. Outer ring - counterpart to the inner ring, also with or without guide rims.
3. Cylindrical rollers - rolling elements in cylindrical form, transmit the load
4. Cage - Keeps the rollers at a distance and guides them evenly.
5. Guide rims (optional) - Guide the rollers axially; these can be located on the inner or outer ring.
6. Seals or covers (optional) - Protect rolling elements and raceways from dirt, dust and moisture.
7. Lubricant - Not a direct component, but important for reducing friction and wear.

Types of cylindrical roller bearings (according to DIN 5412):

1. N-bearing: Inner ring without guide edges → Axial displaceability of the shaft
2. NU bearing: Outer ring without guide edges → Housing displacement possible
3. NJ bearing: Axial guidance on one side (e.g. from the shaft)
4. NUP bearing: Axial guidance on both sides (fixed bearing)
5. NF / NN / NNU / etc.: Special designs, often for high loads or special installation conditions.

Typical areas of application for cylindrical roller bearings:

Cylindrical roller bearings are versatile and are used in numerous industries, particularly where high radial loads and precise motion sequences are required.

1. Mechanical and plant engineering:
In this industry, cylindrical roller bearings are indispensable due to their high load carrying capacity and rigidity. They are used in:
Machine tools, e.g. for supporting spindles in milling machines and lathes.
Presses and rolling mills to absorb large radial forces.
Electric motors and gearboxes for precise and reliable motion transmission.

2. Automotive industry:
Cylindrical roller bearings contribute to the efficiency and durability of vehicle components. They are used in:
Gearboxes to support rotary motion and power transmission.
Wheel hubs for stable wheel mounting.
Engine components to reduce friction and wear.

3. Rail vehicles:
In rail technology, cylindrical roller bearings are crucial for safety and reliability. Applications include:
Traction motors for efficient power transmission.
Gearboxes to ensure even power distribution.

4. Wind turbines:
In wind turbines, cylindrical roller bearings are particularly suitable due to their ability to support high loads for:
Rotor bearings to support the main rotor shaft.
Gearboxes for the transmission of rotational energy.
Generators for converting mechanical energy into electrical energy.

5. Mining and construction:
In these sectors, bearings must withstand extreme conditions. Cylindrical roller bearings are used in:
Crushers and excavators for crushing and moving materials.
Conveyor belts for continuous material handling.
Construction machinery such as cranes and bulldozers.

6. Air and space transportation:
Precision and reliability are of the utmost importance here. Cylindrical roller bearings are used in:
Aircraft engines to support the main shaft.
Landing gear systems for stable landings and take-offs.
Gearboxes for power transmission in various aircraft systems.

7. Robotics and automation:
Precise movements are essential in modern manufacturing. Cylindrical roller bearings are used in:
Robot arms for precise positioning.
Precision gearboxes for controlling complex motion sequences.
Absolute sensor systems for exact measurements and control.

Advantages of cylindrical roller bearings:

• Very high radial load carrying capacity.
• Suitable for high speeds (depending on design).
• Low friction.
• Axial displaceability for certain types → ideal for temperature-related linear expansion.
• Easy to install, as the inner and outer ring can often be mounted separately.

Challenges of cylindrical roller bearings:

• Not all cylindrical roller bearings can support axial forces!
• Lubrication is crucial: oil or grease lubrication depending on the application.
• Avoid installation with preload if axial displacement is required.
• Select internal clearance e.g. C3, C4 to suit the temperature and fit.

Thanks to the linear contact between the cylindrical rolling elements and the raceways, cylindrical roller bearings can support considerable radial loads. Certain designs can also support axial forces. These properties make them ideal for applications with high loads and rigidity requirements, such as in gearboxes, electric motors or rail vehicles.

Below is an overview of the most important points that should be considered when purchasing cylindrical roller bearings:

When purchasing cylindrical roller bearings, it is crucial to carefully consider both technical and economic aspects. Here are the most important factors you should pay attention to:

• Different cylindrical roller bearings are optimized for specific operating conditions. Before purchasing, determine which design is suitable for your application.
• Select the appropriate bearing type (e.g. N, NU, NJ, NUP) according to the required axial guidance and displaceability.
• Ensure that the bearing can withstand the specific radial and, if applicable, axial loads of your application.
• Take into account the maximum rated speed of the bearing, especially for high-speed applications.
• For applications with high demands on precision and smooth running, bearings with tight tolerances and high dimensional accuracy should be selected.
• Look for high-quality, hardened steels with high purity to ensure a long service life and reliability.
• Select the appropriate lubricant (grease or oil) based on the operating conditions. In some cases, special lubricants are required, for example for high temperatures or corrosive environments.
• Consider the operating temperature and possible moisture effects. In extreme conditions, special bearings with appropriate seals or materials may be required.
• In dusty or dirty environments, bearings with effective seals or gaskets are recommended to prevent the ingress of particles.
• Dismountable bearing designs make mounting and dismounting easier, which is particularly advantageous if bearings are changed frequently.
• Consider the maintenance requirements and, if necessary, choose low-maintenance or maintenance-free bearing solutions.
• Choose suppliers with certifications such as ISO 9001, which can be an indicator of robust quality management.
• Competent technical support from the supplier can be valuable in selecting the right bearing and answering technical questions.
• Make sure the supplier can deliver the required bearings in the required time to avoid production downtime.
• Consider not only the purchase price, but also the total cost of ownership over the life of the bearing.

Purchasing cylindrical roller bearings requires a holistic view of technical requirements, environmental conditions, supplier quality and economic aspects. Through careful planning and selection, you can ensure the long-term performance and reliability of your machines and systems.

Cylindrical roller bearings can be purchased from various suppliers. You will find comprehensive information on manufacturers and suppliers of Cylindrical Roller Bearings around the world on Exportpages.