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Needle roller bearings

The rolling elements of needle roller bearings are basically cylindrical rollers, but they are long and thin relatively to their diameter. The needle roller bearing has low cross section, but possessing high load carrying capacity, and therefore they are particularly suitable in applications where there is constraint of radial installation space. Needle roller bearings are presented in many designs and sizes, such as needle roller and cage assemblies, drawn cup needle roller bearings, as well as cam rollers and cam followers are also categorized as needle roller bearings.


Needle Rollers and Cage Assemblies

The cage of the needle rollers and cage assemblies are acting an important role for the bearings to operate at high speed, in addition to high load carrying capacity. There are neither inner rings nor outer rings, the cage holds the needle rollers, with its low cross section that provides the maximum load carrying capacity, and within the smallest radial space among all types of bearings. The cage is uniquely designed to precisely hold the needle rollers to possibly reduce stresses of bearing during operations, and allowing moderate shaft misalignment so that to extend the bearing life span.

Drawn Cup Needle Roller Bearings

Drawn cup needle roller bearings have a unique thin walled structure of outer rings with either open or closed end. The drawn cup is the thinnest outer ring among all types of rolling bearings. In spite of thin outer rings, drawn cup needle roller bearings have capability of carrying high radial loads. This construction of bearings is suitable for application in case when the housing bore cannot be used as a raceway (same as for needle roller and cage assemblies), but a very compact bearing arrangement is required.