NTN NU2205EAT2X CYLINDRICAL ROLLER BEARING

Suited to high radial loads and to use as a non-locating or locating bearing, cylindrical roller bearings offer low friction and good rigidity. They are available in a wide range of models and variants tailored to specific contexts: heat, axial displacement, operating noise, speed, capacity, etc.

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

Breakdown:
- NU: single-row bearing with two shoulders on the outer ring and none on the inner ring; inner ring separable.
- EA: denotes NTN's ULTAGE™ series; overall dimensions are maintained to standard limits, but internal specifications are 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 mounting and dismounting. Axial displacement is achieved by sliding on the seats, making these bearings a natural solution for non-locating applications.

The ULTAGE™ series retains the overall dimensions of standard bearings while incorporating larger-diameter and more numerous rollers. The roller generatrix profile is optimized to limit stress concentrations at the contact ends. These internal developments 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 mounting, particularly useful on constrained geometries.

Maintenance:
Open bearing: lubrication (grease or oil) must be adapted to service conditions. The ULTAGE™ series benefits from extended re-greasing intervals. Shaft/bore mounting tolerances must comply with NTN recommendations to maintain residual clearance within the allowable range. During operation, monitor temperature, vibration and noise. Permissible misalignment is 1/500 mm/mm.

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

Applications:
These NTN bearings are used as non-locating bearings, paired with a fixed bearing (type NJ or NUP) to form a complete arrangement. They are suitable for industrial drives, reducers with long shafts, 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 make them relevant for equipment with variable loads or frequent starts.