Needle roller bearing

Characteristics of needle roller bearings

Needle roller bearings are single- or double-row rolling bearings consisting of thick-walled, machined bearing rings. They can support radial forces and, due to their design, place low demands on dimensional and form accuracy as well as hardness of the mating structure. For applications with increased requirements on radial load carrying capacity, the needle roller bearings can also be designed with full complement needles. The needle roller bearings can be optionally lubricated via a relubrication hole.

For small radial installation space, the needle roller bearings can also be mounted directly on the shaft without an inner ring.

For this purpose, the raceway of the shaft must be ground and hardened. It is recommended for this a minimum surface hardness of the shafts of 670 HV with sufficient hardening depth (SHD/CHD).

Load capacity

About the values for the load capacity of the needle roller bearings, our service team will be happy to provide information.

For the minimum radial load of needle roller bearings, a ratio of Fr/Cr>0.02 is recommended, especially at high speeds. The values for the dynamic load rating Cr can be found in our product data sheets.

Accuracy

The dimensional and running tolerances correspond to the tolerance class PN according to DIN 620-2.

Bearing clearance

The needle roller bearings are designed in the standard with the bearing clearance class C2 according to DIN 620-4.

Cages

Needle barrels are usually equipped with metal cages. Cages made of plastic are only available for certain sizes on request.