Needle roller bearing

Needle roller bearing is a roller bearing with cylindrical roller. Compared with its diameter, the roller is slender and long. This kind of roller is called needle roller. Despite its small cross section, bearings still have high load bearing capacity. Needle roller bearings are equipped with slender and long rollers (roller diameter D < 5mm, L/D < 2.5, L is roller length). Therefore, the radial structure is compact. When the inner diameter size and load capacity are the same as other types of bearings, the outer diameter of needle roller bearings is the smallest, which is especially suitable for the bearing results whose radial installation size is limited.
In order to ensure the same load capacity and operation performance as ring bearing, the surface hardness of raceway surface of shaft or shell hole should be similar to that of raceway of bearing ring. This kind of bearing can only bear radial load.