Needle roller bearings are equipped with thin and long rollers (the roller length is 3-10 times the diameter, and the diameter is generally not greater than 5mm), so the radial structure is compact, and its inner diameter and load can be the same as other types of bearings. The smallest diameter, especially suitable for the support results of the limited size of the radial device.

Depending on the place of application, bearings without inner ring or needle roller and cage components can be selected. 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 load capacity and running performance Same as the bearing with ring, the surface hardness, machining accuracy and appearance quality of the shaft or housing hole raceway should be similar to the raceway of the bearing ring. This type of bearing can only accept radial loads.

Reliable quality needle roller bearings are far ahead of the international market. In places where oil seals cannot be installed due to space constraints, drawn cup needle roller bearings with oil seals at the open or blocked ends can be provided. The inner ring of the oil seal bearing is 1mm wider than the outer ring. Even when the bearing has a slight displacement relative to the bearing housing, the oil seal can work well and avoid contamination of the shaft.

Needle roller bearings are composed of one or two ferrules and a needle roller set with a holder. If the shaft cannot be used as a raceway, that is, if it is impossible or uneconomical to harden the shaft by grinding, this can be used Needle roller bearings with inner ring. The needle roller bearing is a bearing unit composed of a radial needle roller bearing and a thrust bearing component. It has a compact structure and a small volume and high rotation accuracy.

It can accept a certain axial load while accepting a high radial load. The use of high-precision cylindrical rollers (needle rollers) increases the contact length, so that the bearing can achieve high load capacity and high rigidity in a small space. , It has been standardized, serialized and generalized, suitable for mass consumption and supply, and it is very convenient to use and maintain.