Plain bearings They are among the most important components used in the manufacture of machinery and industrial equipment. Although they often remain invisible to the end user, the reliability of entire mechanical systems depends on their quality and correct operation. They are used in many sectors of industry – from the energy and railway sectors to heavy industry, the maritime sector and manufacturing.
In this article, we explain what plain bearings are, what their advantages are, and why choosing the right ones is crucial to the efficiency of machinery.
What are plain bearings?
Plain bearings are machine components that enable rotational or linear motion between mating parts. Unlike rolling bearings, they do not use balls or rollers, but instead rely on the phenomenon of sliding between the working surfaces.
They usually consist of a sleeve or bearing shell made from materials with suitable tribological properties, i.e. those that ensure low friction and high wear resistance.
Thanks to their design, plain bearings are ideal for use under heavy loads, at high temperatures and in environments exposed to contaminants.
Where are plain bearings used?
The range of applications for plain bearings is extremely wide. They can be found, amongst other things, in:
- power turbines,
- industrial compressors,
- pumps and fans,
- mining machinery,
- steelworks equipment,
- high-power electric motors,
- rail vehicles,
- production and process machinery.
In many applications, they are indispensable due to their ability to withstand very heavy loads whilst maintaining stable operation.
The main advantages of plain bearings
High load-bearing capacity
One of the greatest advantages of plain bearings is their ability to withstand significant radial and axial loads. Thanks to the large contact area, the forces are distributed evenly, which increases the service life of the entire system.
Resistance to harsh operating conditions
Plain bearings are ideal for environments characterised by high temperatures, high levels of dust or the presence of moisture. They are often used in situations where standard rolling bearings do not offer sufficient durability.
Quiet operation
The absence of rolling elements means that plain bearings operate exceptionally quietly. This is particularly important in large industrial installations and equipment where vibration must be minimised.
Long service life
Properly designed and manufactured plain bearings can operate for many years without needing to be replaced. The quality of the materials and the appropriate choice of manufacturing technology are of key importance here.
Materials used in the manufacture of plain bearings
Depending on the operating conditions, plain bearings are made from various materials, such as:
- tin bronzes,
- aluminium bronzes,
- copper alloys,
- Babbitt-type tin alloys,
- composite materials,
- specialised high-temperature-resistant alloys.
The choice of the right material has a direct impact on wear resistance, the coefficient of friction and the service life of the entire component.
Reconditioning of plain bearings – an effective way to reduce costs
If a bearing is worn out, it is not always necessary to manufacture a new one. Professional reconditioning of plain bearings restores them to their original technical specifications at a significantly lower cost than purchasing new components.
The regeneration process may include:
- replacement of the sliding layer,
- cladding or casting new material,
- machining,
- dimensional and quality checks.
This enables companies to significantly reduce their maintenance costs and minimise machine downtime.
How do you choose a manufacturer of plain bearings?
When choosing a supplier, it is worth bearing in mind a few key aspects:
- experience in the sector,
- in-house production facilities,
- the ability to manufacture components in accordance with the customer’s specifications,
- quality control of materials,
- refurbishment and maintenance services.
Working with an experienced manufacturer enables us to develop solutions that are perfectly tailored to the specific characteristics of a particular machine and its operating conditions.
Summary
Plain bearings play a key role in the operation of modern industrial machinery. Their high load-bearing capacity, resistance to harsh operating conditions and long service life make them an indispensable component of many industrial systems.
The selection of high-quality plain bearings and the professional reconditioning of worn components help to improve machine reliability, reduce operating costs and ensure the continuity of production processes. As a result, companies can achieve their business objectives more effectively and minimise the risk of costly downtime.