Double Row Cylindrical Roller Bearings Nachi

A double row cylindrical roller bearing is a type of rolling element bearing that contains two rows of cylindrical rollers arranged parallel to each other. Heres a description of its key features:

1. Construction: The double row cylindrical roller bearing consists of two sets of cylindrical rollers held in place by inner and outer rings. The rollers are guided by either integral flanges on the inner or outer ring or by separate guiding rings.

2. Load Capacity: This bearing type can support higher radial loads compared to single row cylindrical roller bearings due to the increased number of rollers and enhanced contact area.

3. Axial Load Capability: Double row cylindrical roller bearings can also accommodate axial loads in both directions, although they are primarily designed for radial loads.

4. Design Variants: There are several design variants available, including:

   • NN design: These bearings have separate ribs on the inner and outer rings, enabling them to carry high radial loads and moderate axial loads in both directions.
   • NNU design: This variant features integral flanges on the inner ring, and no flanges on the outer ring, allowing for easier axial displacement.
   • NNUP design: Incorporates an additional flange on the outer ring, providing enhanced axial load-carrying capacity and the ability to accommodate misalignment.

5. High Precision: Double row cylindrical roller bearings are manufactured to high precision standards, ensuring smooth operation and minimal friction.

6. Applications: Commonly used in heavy machinery applications such as rolling mills, gearboxes, machine tool spindles, and large electric motors where high radial loads and moderate axial loads are present.

7. Sealing and Lubrication: Depending on the application, double row cylindrical roller bearings may come with seals or shields to protect against contaminants and retain lubrication, ensuring prolonged service life.

Overall, double row cylindrical roller bearings offer increased load-carrying capacity and versatility compared to single row bearings, making them suitable for demanding industrial applications.