NTN NU2206EAT2X CYLINDRICAL ROLLER BEARING

Suitable for 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 tailored to specific contexts: heat, axial displacement, operating noise, speed, capacity, etc.

NTN cylindrical roller bearings of the ULTAGE™ series are a benchmark solution for applications with high radial loads and sustained rotational speeds. The optimized internal design of this range provides increased load capacity within identical envelope dimensions to 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; separable inner ring.
- EA: designates NTN's ULTAGE™ series; standard limit dimensions retained, but internal specifications optimized (increased roller diameter, length and number).
- T2X: glass-fiber reinforced polyamide cage.

Features :
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, simplifying installation and removal. Axial displacement occurs by sliding on the seating surfaces, making these bearings a natural solution for floating bearings.

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

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 tight geometries.

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

Key advantages :
- Increased radial load capacity within the same envelope, without modifying existing bore dimensions.
- Separable inner ring, facilitating installation and replacement without full removal of the shaft.
- Free axial displacement accommodating 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 a floating bearing, paired with a fixed bearing (type NJ or NUP) to form a complete mounting. They are suitable for industrial drives, long-shaft reducers, gearboxes, electric motors and 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.