The acronym DDU in NSK bearings is an acronym for “Double Contact Seal with Urethane Rubber” in English, which can be translated into Italian as “Double Contact Seal with Urethane Rubber”.
DDU bearings are designed with two urethane rubber seals around the bearing itself to prevent contamination and dust, dirt or other debris from entering the bearing. These double contact seals offer better protection than bearings with single seals and are often used in applications where it is essential to keep the bearing protected from external agents that could damage it.
DDU bearings with double contact urethane rubber seals are especially important in environments where it is necessary to protect the bearing against external contaminants. Here are some of the reasons why DDU bearings are preferred in certain applications:
- Protection against contaminants: Double contact seals provide better protection against dust, dirt, water and other contaminants that can damage the bearing or affect its performance.
- Longer service life: The presence of double contact seals helps to extend the life of the bearing, as they minimize wear caused by contaminants.
- Reduced maintenance: Thanks to the enhanced protection offered by DDU seals, the bearings require less maintenance and lubrication than single-sealed or open bearings.
- Critical Applications: DDU bearings are often used in applications where precision and reliability are critical, such as in engines, transmissions, wheel bearings and other automotive and industrial applications.
- Noise Reduction: Double contact seals can help reduce the level of noise generated by the bearing in operation.
It's important to note that although DDU bearings offer greater protection than other types of bearings, it's still vital to pay attention to regular maintenance to ensure they continue to function reliably over time. Furthermore, choosing the correct bearing always depends on the specific needs of the application in which it will be used.
