Needle roller bearing RSM Bearings

Needle roller bearings are roller bearings with slender cylindrical rollers, they have the highest load capacity for a given radial space of all rolling-element bearings. This makes these bearings ideal for applications where radial space is limited but high radial load carrying capacity is required. Needle roller bearings are also suitable for applications with high rotational speed but cannot accommodate axial loads.

All needle bearings are variations of two basic designs. The first needle bearing design; full complement, has a full complement of needles and contains no retainer. The second needle bearing design; caged needle contains a retainer or cage for roller guidance and spacing. Caged needle bearings have smaller roller complements and lower load capacities than full-complement bearings.

Needle bearings have the advantage of a higher speed capacity; retainers prevent high-velocity rubbing between adjacent needles and provide more effective roller guidance
(Needle bearings are usually lubricated with grease, but oil or oil-mist lubrication is preferred for heavy-duty or high-speed applications. Many light-duty needle bearings never require re-lubrication, but high loads or speeds demand it).

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