Needle roller bearings can be divided into the following categories according to their structure: sealed drawn cup needle roller bearings with inner ring needle roller bearings and without inner ring needle Clutch Release Bearing roller bearings/no inner ring without holder needle roller bearings, with holding frame and without holding frame .

The frame is filled with needle roller bearings, needle roller bearings without ribs, self-aligning needle roller bearings, combined needle roller/ball bearings and needle roller bearings with knurled outer rings, which are more conducive to bearing positioning in use , Bearings of this size can only accept radial loads.Needle bearing (needle bearing) is a roller bearing with cylindrical rollers, relative to its diameter, the rollers are both thin and long.

Although the bearing has a small cross-section, the bearing still has a high load-accepting ability. At this time, the outer surface of the journal and the outer surface of the housing hole that match the bearing are directly used as the inner and outer rolling surfaces of the bearing to ensure the load capacity and running performance It is the same as the bearing with ferrules, except for the bearings listed in the catalog, which can be used for ordinary engineering bearings.

It is especially suitable for supporting structures where the size of the radial device is limited. The needle roller bearing is equipped with thin and long rollers (roller diameter D≤5mm, L/D≥2. Depending on the place of application, bearings without inner ring or needle roller and holder components can be selected. This kind of roller is called a needle roller.5, L is the roller length), so The radial structure is compact, and its inner diameter and load can be the same as other types of bearings.

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