Needle Bearing
Needle Bearing

Needle Bearing

The needle bearing is an extremely low-profile rolling bearing with a very high load capacity, but it should only be subjected to radial loads. Needle bearings are often used without outer and inner rings. Depending on the installation case, they can be used with or without an inner ring. Needle bearings without an inner ring are suitable for hardened and ground shafts. Since the inner ring is omitted, the shaft can be designed to be stronger and thus stiffer. Needle bearings without an inner ring also have less axial play because the displacement of the shaft relative to the housing depends only on the width of the raceway. For bearings without an inner ring, the dimension of the envelope circle is crucial for the radial bearing clearance. The envelope circle is the inner boundary circle of the needle rollers when they are in contact with the outer raceway without play. Needle bearings with an inner ring are used for applications where hardening and grinding of the shaft is not possible or economically feasible. In combination as...
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