Entity Bushed Needle Roller Bearing

Solid ring needle roller bearing consist of one or two rings and a needle roller set with a cage. Depending on the application, they can be divided into bearings with or without inner rings. Therefore, the physical bearing needle roller bearing can meet the requirements of lightweight, small footprint, and high transmission power. Solid ring needle roller bearings have a small size and high load carrying capacity.

The main structure type of this needle bearing:
Outer ring double (or double lock) with cage needle roller bearings NA, NKI type
The inner ring and the outer ring (with locking ring, full set of needle roller and cage) can be installed separately. The permission speed is high, and it can be divided into single row and double row.
If the shaft cannot be used as a raceway, that is, if it is impossible or uneconomical to grind the shaft, such a needle roller bearing with an inner ring can be used.

No inner ring cage needle roller bearing

NA and NKI needle bearing without inner ring also called RNA and NK needle roller bearing.

This kind of needle bearing has no inner ring and is suitable for the support structure with limited radial installation dimensions. The journal that matches the needle bearing directly acts as the rolling surface. As the axis of the raceway surface, the hardware must be hardened and ground, and only when it is processed to an appropriate size and shape accuracy, the entire set of needle roller bearings can have high life and running accuracy. At the same time, since there is no inner ring, the diameter of the shaft can also be appropriately increased, which also increases the rigidity.

Sealed needle roller bearing with or without inner ring of needle bearing
Single-sided or double-sided sealed needle roller bearings can effectively prevent the intrusion of dirt, the needle bearing has been filled with the right amount of lithium-based grease. The inner ring of this type of bearing is wider than the outer ring, which allows the bearing to ensure good sealing and avoid bearing contamination when the shaft is slightly displaced with respect to the needle bearing housing. The inner ring of the bearing also has a lubrication hole, which can be relubricated by the outer ring or the inner ring according to the needs of the configuration.