Classification Of Plain Bearings
Classification Of Plain Bearings
2021年12月10日
Considerations For The Selection Of Imported Bearings
Considerations For The Selection Of Imported Bearings
2021年12月10日

Types And Classification Of Needle Roller Bearings

 

Type of needle roller bearing:

In addition to the bearings listed in the catalogue, SKF can also supply various types of needle roller bearings, such as open stamped outer ring needle roller bearing (1), closed stamped outer ring needle roller bearing (2), needle roller bearing with inner ring (3) and needle roller bearing without inner ring (4), 1. Needle cage assembly 2, needle roller bearing without stop 3, self-aligning needle roller bearing 4 Combined needle roller / ball bearing 5, combined needle roller / thrust ball bearing 6, combined needle roller / cylindrical roller thrust bearing

 
Punching outer ring needle roller bearing

The pressed outer ring needle roller bearing is a needle roller bearing with a thin pressed outer ring. Its main feature is that the section height is very low and the load bearing capacity is high. It is mainly used for bearing configuration with compact structure and low price, and the hole in the bearing box can not be used as the raceway of needle cage assembly. The bearing and bearing housing must be installed in an interference fit manner. If the axial positioning functions such as box shoulder and stop ring can be omitted, the bore in the bearing box can be made very simple and economical.。

Types And Classification Of Needle Roller Bearings

The stamped outer ring needle roller bearing installed on the shaft end has two side open type (1) and one side closed type (2). The base end face of the closed stamping outer ring can bear little axial force. Needle roller bearings with stamped outer rings are generally not attached with inner rings. When the journal cannot be hardened and ground, the inner ring listed in the table can be used. The hardened steel plate outer ring of the punched needle roller bearing cannot be separated from the needle roller cage assembly.

 

The free space for storing lubricant can extend the lubrication interval. Bearings are generally designed in a single row. Except for the wider bearing series 152216222032538 and 3038, which are equipped with two needle roller cage components. There are lubricating oil holes in the outer ring of the bearing. According to the needs of users, all single row stamped outer ring needle roller bearings with shaft diameter greater than or equal to 7mm can be equipped with outer ring with lubricating oil hole (code suffix AS1).

 
Needle roller bearing with pressed outer ring with oil seal

When the oil seal cannot be installed due to space constraints, needle roller bearings (3 to 5) with oil seal stamped outer ring at open end or closed end can be provided. This kind of bearing is equipped with polyurethane or synthetic rubber friction oil seal, which is filled with lithium grease with good anti rust performance, and the applicable operating temperature is – 20 to + 100 ℃. The inner ring of the bearing with oil seal is 1mm wider than the outer ring, which ensures that the oil seal works well without causing pollution to the shaft when there is a slight displacement of the bearing shaft relative to the bearing box. The bearing inner ring also has lubrication holes, which can be supplemented by the outer ring or inner ring according to the needs of bearing configuration.

 
Classification of needle roller bearing:

1). Centripetal needle roller and cage assembly
2). Na, NKI needle roller bearing
3). RNA, NK type needle roller bearing without inner ring
4). HK type stamped outer ring needle roller bearing
5). BK type stamped outer ring needle roller bearing
The stamped outer ring needle roller bearing installed on the shaft end has two side open type (1) and one side closed type (2). The base end face of the closed stamping outer ring can bear little axial force.