Characteristics and uses of needle roller bearings:

Needle roller bearings are equipped with thin and long rollers (roller length is 3 to 10 times the diameter, the diameter is generally not greater than 5mm), 

so the radial structure is compact, its inner diameter size and load capacity are the same as other types of bearings, and the outer diameter is the smallest, 

especially suitable for radial installation size limited support results. According to the different occasions, bearings or needle roller and cage components 

without inner rings can be selected, and the journal surface and shell hole surface matched with the bearing are directly used as the inner and outer rolling 

surface of the bearing. In order to ensure that the load capacity and operating performance are the same as that of the bearing, the hardness, processing 

accuracy and surface quality of the shaft or shell hole raceway surface should be similar to the raceway of the bearing ring. Such bearings can only bear 

radial loads. SUNTHAI bearing

The release bearing consists of a raceway ring with a needle roller and cage assembly, which can be combined with a thin raceway ring (W) for stamping 

or a thick raceway ring (WS) for cutting. The non-separation bearing is an integral bearing consisting of a precision stamped raceway ring with a needle 

roller and cage assembly

Can withstand unidirectional axial load

This kind of bearing occupies a small space, which is conducive to the compact design of the machine

Most of them only use the needle roller and cage assembly, and the mounting surface of the shaft and the housing is used as the raceway surface

The main applicable cage: steel plate stamping, synthetic resin forming cage

Main applications: automobile, cultivator, machine tool, etc

Specific classification and model comparison:

1. Centripetal needle roller and cage assembly (Type K)

2, needle roller bearings with double locking rings (NA, NKI, RNA, NK)

3. Single row needle roller bearing with double rib on outer ring (NA, NKI, RNA, NK)

4, double row needle roller bearings with double rib (NA type, RNA type)

Note: NA bearing bearing radial load, small diameter size, especially suitable for radial installation size limited structure, limit speed is higher 

single-row needle roller bearing inner diameter d!!) 799!! :99 bearing outer ring with double lock ring! ; :99 bearing outer ring with double rib 

double row needle roller bearings!" ) 799

RNA is suitable for structures with limited radial mounting size, the journal surface is directly used as the rolling surface, and the hardness of 

the rolling surface is generally (* < 62=8" single row bearing "> ! -199 for the outer ring with double lock ring, "> ; -199 outer ring with double 

rib double row bearing ">" 2199 only bear radial load, the limit speed is higher

5, stamping outer ring needle roller bearings (HK type, BK type)

Note: This bearing has low cost, large bearing capacity, and is suitable for supporting structures with limited installation size. The journal 

surface is hardened as a rolling surface, and the bearing is pressed into the seat hole without axial positioning. Bearings should be injected 

into the appropriate amount of grease before installation, under normal circumstances, after the assembly does not need to lubricate the 

BK bearing used in the support of the journal without an extended end, the end face closure plays a sealing role, and can withstand small 

axial swimming power. SUNTHAI bearing