needle bearing

Detailed Product Description

Needle bearings are roller bearings with rollers that have high length-to diameter ratios. Needle bearings are used in farm and construction equipment, automotive transmissions, small gasoline engines, gear pumps, small appliance and tool motors, alternators, and aircraft controls.

Compared with other roller bearings, needle bearings have much smaller rollers for a given bore size. Needle bearings have the highest load capacity for a given radial space of all rolling-element bearings, but their use is limited to bore diameters less than 10 in.

Drawn-cup, full-complement needle bearings consist of a deep-drawn cup (the outer race) with a full complement of needles. In some needle bearings the needles are retained by the cup lips, in others they are retained by the grease. Spherical-ended, rather than trunnion-ended, rollers are used in the grease-retained needle bearings, which give a slight gain in load capacity.  better tolerance for misalignment

Drawn-cup, caged need