Needle roller bearing

The purpose and characteristics of needle roller bearings
Needle roller bearings are roller bearings with cylindrical rollers, and the rollers are both thin and long relative to their diameter. This type of roller is called a needle roller. Despite having a small cross-section, bearings still have a high load-bearing capacity, making them particularly suitable for situations where radial space is limited.
The contour surface of the needle roller shrinks slightly at the proximal end. The result of contact correction between the rolling needle and the rolling track line can avoid the generation of destructive edge stress. In addition to the bearings listed in the catalog, which can be used for general engineering, such as open stamped outer ring needle roller bearings (1), closed stamped outer ring needle roller bearings (2), needle roller bearings with inner rings (3), and needle roller bearings without inner rings (4), SKF can also supply various types of needle roller bearings, including: 1. Needle roller cage components 2, edgeless needle roller bearings 3, self-aligning needle roller bearings 4, combination needle/ball bearings 5, combination needle/thrust ball bearings 6, and combination needle/cylindrical roller thrust bearings.
Stamped outer ring needle roller bearing
Stamped outer ring needle roller bearings are needle roller bearings with thin stamped outer rings. Its main feature is a low cross-sectional height and high load-bearing capacity. Mainly used for bearing configurations that are compact in structure, cheap in price, and cannot be used as raceway components for needle roller cages. The bearings and bearing housings must be installed in an interference fit manner. If axial positioning functions such as shoulder and stop ring can be omitted, then the bore inside the bearing box can be made simple and economical.
The stamped outer ring needle roller bearings installed at the shaft end have double-sided open type (1) and single-sided closed type (2). The base end face of the closed stamped outer ring can withstand relatively small axial guiding forces.
Stamped outer ring needle roller bearings generally do not come with an inner ring. In situations where the shaft neck cannot be hardened or ground, the inner ring listed in the table can be used. The quenched steel plate outer ring of the stamped outer ring needle roller bearing cannot be separated from the needle roller holder assembly. The free space for storing lubricants can extend the interval for replenishing lubrication. Bearings generally adopt a single row design. Except for the wider specification bearings 1522162220302538 and 3038 series, which are equipped with two needle roller cage components. The outer ring of the bearing has lubricating oil holes. According to user needs, all single row stamped outer ring needle roller bearings with a shaft diameter greater than or equal to 7mm can be equipped with an outer ring with lubricating oil holes (code suffix AS1).
Stamped outer ring needle roller bearing with oil seal
In situations where oil seals cannot be installed due to space limitations, open or closed end oil seal stamped outer ring needle roller bearings (3 to 5) can be provided. This type of bearing is equipped with a friction type oil seal made of polyurethane or synthetic rubber, which is filled with lithium based grease with good anti rust properties and suitable for operating temperatures ranging from -20 to+100 ℃.
The inner ring of the oil sealed bearing is 1mm wider than the outer ring, which ensures that the oil seal works well and prevents the shaft from being contaminated even when there is a slight displacement of the bearing relative to the bearing box. The inner ring of the bearing also has lubrication holes, which can be supplemented by the outer or inner ring according to the needs of the bearing configuration.