Needle roller bearing: Needle bearing (needle bearing) is a roller bearing with cylindrical rollers, equipped with thin and long rollers (the roller length is 3 to 10 times the diameter, and the diameter is generally not greater than 5mm). 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 is the smallest. It is especially suitable for support structures with limited radial installation dimensions. Needle roller bearings are used in different situations. The processing accuracy and surface quality should be combined with the bearing rings and uses.

Purpose of needle roller bearings: This type of bearing takes up little space and is conducive to the compact design of machinery. Most of them only use needle roller and cage components, and the mounting surface of the shaft and housing is used as the raceway surface. Mainly applicable cages: Steel plate stamping retainer, synthetic resin molded cage; main uses: transmission devices for automobiles, cultivators, machine tools, etc.