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Needle
Needle roller bearings (needle bearing) with cylindrical roller bearings, relative to its diameter, roller is fine and long. The roller called needle roller. Although it has a small section, the load bearing capacity of bearing still had high, with thin and long needle bearing roller (roller diameter of D = 5mm, L/D = 2.5, L as the roller length), so the radial structure is compact, the minimum outside diameter of the size of the inner diameter and load capacity and other types of bearings, especially for supporting the same, structure to the radial installation size restricted.
The main purposes:
With thin and long needle bearing roller (roller length is 3~10 times the diameter of the straight, Diameter less than 5mm), so the radial structure is compact, the size of the inner diameter and load capacity and other types of bearing at the same time, minimum diameter, especially for the supporting structure of radial installation size restricted. Needle roller bearings use according to different occasions, the machining precision and the surface quality of bearing ring, use of combination. Needle roller bearing is a bearing unit composed of radial needle roller bearing and thrust bearing component combination.