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Cement Fan - Bearings inspection

Fans and blowers are strategically relevant plant components for a number of industry segments, such as the cement, steel and petrochemical sectors, mining and quarrying, waste removal, and the food industry. 

A distinction is made between two different types of fans – centrifugal and axial – depending on the direction in which the air or gas flows. 
In axial fans, the flow goes through the fan, parallel to the fan’s axis. 
By contrast, the air or gas enters a centrifugal fan parallel to the drive system's axis (i.e. axially) and is forced out radially by the rotating impeller. There are also various different drive systems: direct drives, belt drives and clutch drives.

Bearings from NSK run extremely quiet, have a long service life and are very reliable – even in the most demanding ambient conditions characterised by high speeds, contamination, moisture and extreme temperatures.

We can offer you the right product for tough conditions, different fan and drive types, and various industry sectors. Our extensive range includes everything from standard bearings to bearings with a special design construction. NSK’s application engineers are happy to advise you and work with you to develop the ideal solution.

Operating conditions: difficult environment with factors such as high speeds, high temperatures, contamination from dust, voltage fluctuations

Direct drives are often used for compact fans. The impeller is mounted  directly onto the electric motor’s driven shaft, meaning that a great deal of strain is placed on the bearings in the fan’s electric motors. In these operating conditions, bearings can wear out prematurely, leading to production downtime and high maintenance costs.
Single-row deep-groove ball bearings are most commonly used for direct drive systems.

Ceramic Ball Bearings for Fan Motors

Electricity can flow through the bearing as a result of voltage fluctuations, causing electrical corrosion inside the bearing. To solve this problem, NSK has developed deep-groove ball bearings with spread ceramic balls. These offer protection from electrical discharge through the bearing leading to electrical corrosion.

Our innovations:
High-temperature sealed deep-groove ball bearings 
Deep-groove ball bearings in different sizes and designs

Operating conditions: high and unevenly distributed loads, high speeds and temperatures, contamination

The electric motor is mounted parallel to the fan’s impeller. In this case, power is transferred via one or more V-belts and pulleys. This design is usually used for medium to large fans. High volume flows and a build-up of heat can cause the bearings to wear out prematurely, resulting in production downtime and high maintenance costs.

Plummer blocks – the SNN series

The SNN series of plummer blocks from NSK features five different sealing arrangements to meet a range of requirements. The individual components are easy to fit, remove and maintain. Together with advantages such as high rigidity and good heat transfer, the split housings in the SNN series help to reduce costs.
Our innovations: 
NSKHPS Spherical Roller Bearings 
Self-Lube® Units 
Self-Lube® HLT Inserts 
Self-Lube® Inserts with Flinger Seals

Operating conditions: axial displacement, high and unevenly distributed loads, high speeds, extreme temperatures, contamination

The electric motor is mounted on the same axis as the fan’s impeller. The shafts of the electric motor and the fan are connected by a torsionally flexible coupling. This method of connecting the impeller with the electric drive is mainly used for medium and large fans.

The tough conditions can cause the bearings to wear out prematurely, reducing productivity and driving up maintenance costs.

NSKHPS spherical roller bearings

NSK’s compact HPS spherical roller bearings last twice as long as conventional products, even in extreme operating conditions. Their long service life and high performance reduce maintenance costs and boost productivity.

Our innovation:
SNN series of Plummer blocks 

SNN Series Plummer Blocks

SNN Series modular housing range - easy to fit, remove & maintain.  >>

Self-Lube® Units

A versatile range of housings and inserts, suitable for a wide range of industrial applications.  >>

Self-Lube® Inserts with Flinger Seals

Especially designed to provide the insert with additional protection from external contaminants.  >>

Self-Lube® HLT Inserts

These inserts provide opportunities to reduce maintenance, downtime and replacement costs in operation at extreme temperatures.  >>

NSKHPS Series Roller Bearings

NSKHPS series or high performance standard uses state of the art material technology bearings, offering high speed & load ratings.  >>

High Temperature Sealed Deep Groove Ball Bearings

Specially created to run in a contaminated environment, and under high temperatures, up to 150°C.  >>

Ceramic Ball Bearings for Fan Motors

Ceramic, anti-electrical corrosion ball bearings which prevent damage to bearings used in fan motors.  >>
  • Troubleshooting

    Don't let your bearings fail prematurely or unexpectedly. Save yourself trouble and money with the NSK troubleshooting tools. >>

  • Technical Enquiry

    Looking for a new solution? Fill out the technical enquiry form and one of the NSK technical team members will provide assistance as soon as possible. >>

  • Technical Tools - Bearings

    Keep your bearings in good shape with NSK's technical tools, including the NSK Calculation Tools and CAD Drawings. >>


Ball Bearing Units

Self-Lube Bearings, J-Line Bearing Units, Silver Lube, Molded-Oil, Life-Lube, Interchange list, Conversion tables

Maintenance of Plummer Blocks

Pocket Guide

Deep Groove Ball Bearings

Construction, lubrication & materials, SPACEA series

Plummer Blocks and Accessories

SNN Series and SD Series

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