Needle Bearing

الوصف

Needle roller bearings are cylindrical roller with a roller bearing , relative to its diameter , roller both thin and long. This is called needle roller . Despite having a smaller cross-section , it has a higher load bearing capacity, equipped with thin and long needle bearing roller (roller diameter D≤5mm, L / D≥2.5, L is the length of the roller ), so radial structure is compact , its diameter size and load capacity with other types of bearings , minimum diameter , especially for radial bearing installation dimensions restricted structure .

Depending on different occasions, it can be used without an inner ring of the bearing or needle roller and cage assembly, when the surface of the journal bearing surface and shell holes to match the inner bearing directly as outer rolling surface, in order to ensure load capacity and operating performance and have the same bearing rings, shaft or housing bore raceway surface hardness, machining accuracy and surface quality should be similar roller bearing rings. Such bearings can only bear radial load.