Collection: Combined needle roller / cylindrical roller thrust bearings
These bearings consist of needle roller bearings along with a cylindrical thrust bearing. The thrust bearing is identical to the 811XX series of bearings. They are supplied without an inner ring and are suitable for being mounted directly onto the shaft, however in cases where the shaft cannot be used as a raceway such as if the shaft is not hardened or is unground then the bearing can be used with an inner ring which can be mounted onto the shaft and assembled with the bearing.
NKXR series bearings are types of combined needle roller bearings with cylindrical thrust bearings
This bearing series can accommodate axial loads acting in one direction. This enables them to locate the shaft in one direction. For shorter shafts, two bearings can be used in a back-to-back arrangement. This is because the length of the smaller shaft is less susceptible to thermal expansion. When the bearings are used in a back-to-back arrangement it is recommended that the bearings are preloaded using spring washers as they help to prevent the bearings from skidding if one of the bearings doesn't have any load. The effect of preloading can also increase the bearing performance and reduce the noise level in operation.
Features of NKXR needle roller bearings
- They are separable and the needle roller and cylindrical rolling elements can be mounted separately onto the shaft
- They should be used with oil lubrication only for optimal performance as the oil provides an adequate supply of lubrication to the bearing
- The bearings don't have lubrication holes so cannot be relubricated externally.
Sealing combined needle roller bearings
Combined needle roller bearings can be supplied with a stamped steel cover over the thrust part of the bearing. These bearings have a suffix of Z on the part number to denote this. When supplied with the cover, it forms a gap seal which helps to retain grease within the bearings. There are no lubrication holes in these covers to aid re-lubrication.
Consideration needs to be given to the applications these Z suffixed bearings work on as some operation conditions such as very high speeds or temperatures can cause grease leakage. In such situations additional consideration needs to be given to either prevent grease leakage or to enable relubrication.
Other types of combined needle roller bearings
Our range of combined needle roller bearings includes :