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In modern machines and systems, the question often arises: which is better, hydrodynamic or roller bearings? Although roller bearings are widely used, hydrodynamic bearings are proving their worth in many US industries, especially in environments with high loads, long operating times or harsh conditions.
Hydrodynamic bearings and roller bearings are the two basic bearing principles in mechanical and plant engineering. Both fulfill the task of enabling rotating or movements, but differ significantly in their mode of operation, load capacity, and suitability for different operating conditions. A basic understanding of these differences is crucial in order to select the optimal bearing solution for demanding applications.
Hydrodynamic bearings (also known as plain bearings/journal bearings/slide bearings) function without rolling elements: instead, the lubricating film between the bearing and the shaft forms an effective film that reduces wear and reliably supports high loads.
Roller bearings use rolling elements (balls or rollers) between the inner and outer rings. They perform well under low to medium loads, but reach their design limits under extreme conditions.
Hydrodynamic bearings offer numerous technical and economic advantages that make them particularly suitable for demanding applications. These advantages have a direct impact on the performance, reliability, and overall costs of machines and systems.
Due to the large-area force distribution, hydrodynamic bearings can absorb significantly higher static and dynamic loads than roller bearings. This results in longer service life, especially in continuous operation and with large machines. When correctly designed, hydrodynamic bearings can be maintenance-free, which reduces downtime and service costs.
The hydrodynamic lubricating film significantly reduces friction and noise. When correctly designed, hydrodynamic bearing operate with virtually no maintenance, reducing downtime and service costs.
Hydrodynamic bearings require less installation space than comparable roller bearings. This enables more compact machine designs and opens up new degrees of freedom in design, especially for integrated bearing solutions.
Hydrodynamic bearing effectively dampen vibrations and are less sensitive to shock loads. This protects adjacent components and increases the operational reliability of complex systems.
Compared to roller bearings, hydrodynamic bearings are less sensitive to contamination, temperature fluctuations and changing loads. This makes them ideal for use in harsh industrial environments.
In numerous applications, hydrodynamic bearings are not only an alternative to roller bearings, but also a functional and economical improvement. Here are a few examples:
In the USA, hydrodynamic bearings are a key component of heavy-duty engines, trucks, off-highway vehicles, locomotives and industrial transmission applications. Particularly in the American market, with its long operating times, high load cycles and efficiency requirements, hydrodynamic bearings offer decisive advantages over roller bearings - especially for crankshafts, camshafts and highly loaded bearing points.
In key US industries such as oil and gas, petrochemicals, chemicals and industrial process engineering, hydrodynamic bearings are used in pumps and compressors that run 24/7. They enable high reliability, smooth operation and long maintenance intervals. This is a decisive factor for plant operators in the USA.
In American energy generation - from gas and steam turbines to wind turbines - hydrodynamic bearings contribute to high plant availability and reduced operating costs. Especially in large generators and turbines, they enable high power densities and stable performance over long operating times, which is economically crucial for utilities and independent power producers in the USA.
Hydrodynamic bearings are used in the US aviation industry and in new segments such as advanced air mobility (AAM) and urban air mobility (UAM) due to their high load capacity, weight optimization and reliability. They meet the strict requirements of the American aerospace industry in terms of safety, efficiency and service life.
In the US food and beverage industry, the focus is on process reliability, plant availability and low downtime. Hydrodynamic bearings are used for example in homogenizers or pumps, supporting stable production processes in a market that is strongly influenced by efficiency, scalability and regulatory requirements.
Thanks to our comprehensive production capacities at six locations in the US, our customers benefit in particular from short delivery times, fast technical support and direct engineering contact on site. Local production creates planning security, reduces risks in the supply chain, and ensures reliable implementation even for demanding projects.
Miba produces hydrodynamic bearings directly in the USA according to the “local for local” principle. Customers benefit from short delivery times, high supply reliability and a stable, regional value chain.
US customers receive direct access to local engineering support, application engineering and aftermarket services. This enables rapid customization, efficient project management and long-term partnerships.
The product portfolio includes bearing solutions for locomotives, truck engines, generators, compressors, industrial equipment, aftermarket and many more.
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