NTN NU2212EAT2X CYLINDRICAL ROLLER BEARING

Adapted to high radial loads and for use as a floating or fixed bearing, cylindrical roller bearings feature low friction and good rigidity. They are available in a wide range of models and variants suited to specific contexts: heat, axial displacement, operating noise, speed, capacity, etc.

The NTN ULTAGE™ series cylindrical roller bearings are a reference solution for applications with high radial loads and sustained rotational speeds. The optimized internal design of this range provides increased load capacity within the same envelope as standard series, with extended maintenance intervals as a result.

Decoding :
- NU : single-row bearing with two shoulders on the outer ring and none on the inner ring; separable inner ring.
- EA : designates NTN's ULTAGE™ series; standard limiting dimensions retained, but internal specifications optimized (increased roller diameter, length and number).
- T2X : glass-fiber reinforced polyamide cage.

Characteristics :
These NU-type bearings are built around an outer ring with two shoulders and no shoulder on the inner ring. This configuration allows the outer ring–rollers–cage assembly to be separated from the inner ring, which simplifies assembly and disassembly. Axial displacement occurs by sliding on the seats, making these bearings a natural solution for floating bearings.

The ULTAGE™ series retains the envelope dimensions of standard bearings while integrating larger-diameter rollers in greater numbers. The roller generatrix profile is optimized to limit stress concentrations at the contact ends. These internal evolutions result in increased dynamic load capacity and an allowable speed improved by 20% compared with the standard when lubricated with oil. ULTAGE™ type rings are not interchangeable with those of standard series due to a different inscribed circle diameter.

The glass-fiber reinforced polyamide 66 cage offers good mechanical strength, heat resistance and low wear. This material also provides some flexibility during assembly, particularly useful on constrained geometries.

Maintenance :
Open bearing: lubrication (grease or oil) must be adapted to the service conditions. The ULTAGE™ series benefits from extended re-greasing intervals. Shaft/housing fit tolerances must follow NTN recommendations to keep the residual clearance within the allowable range. In operation, monitor temperature, vibrations and noise. The allowable misalignment is 1/500 mm/mm.

Key advantages :
- Increased radial load capacity in the same envelope, without modifying existing bore dimensions.
- Separable inner ring, facilitating assembly and replacement without complete removal of the shaft.
- Free axial displacement absorbing thermal expansions without imposing stress on other components of the assembly.
- Extended maintenance intervals thanks to the technical improvements of the ULTAGE™ series.

Applications :
These NTN bearings are used as floating bearings, paired with a fixed bearing (type NJ or NUP) to form a complete arrangement. They are suited to industrial transmissions, long-shaft gear reducers, gearboxes, electric motors and motor-pump units, wherever the shaft is subject to thermal expansion or axial displacement. The robustness of the ULTAGE™ profile and the polyamide cage also makes them relevant for equipment with variable loads or frequent starts.