The main uses of needle roller bearings

Characteristics and uses of needle roller bearings:

Needle roller bearings are equipped with thin and long rollers (roller length is 3~10 times of the diameter, the diameter is generally not greater than 5mm), so the radial structure is compact, its inner diameter size and load capacity and other types of bearings at the same time, the outer diameter is the smallest, especially suitable for radial installation size limited bearing results. Bearings without inner rings or needle roller and cage components can be selected according to different use occasions. At this time, journal surface and shell hole surface matching with bearings are directly used as inner and outer rolling surfaces of bearings. In order to ensure the same load capacity and running performance as bearing with rings, the hardness, machining accuracy and surface quality of shaft or shell hole raceway surface should be similar to the raceway of bearing rings. This bearing can bear radial load only. SUNTHAI bearing

The free bearing is composed of raceway ring and needle roller and cage assembly, can be pressed with thin raceway ring (W) or cut machined thick raceway ring (WS) any combination of non-separated bearing is made of precision stamping machined raceway ring and needle roller and cage assembly integral type bearing

Can bear unidirectional axial load

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

Most only use needle roller and cage assembly, and the shaft and shell mounting surface as raceway surface

Mainly applicable cage: steel plate stamping cage, 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 on the outer ring (NA, NKI, RNA, NK)

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

4. Double row needle roller bearings with double guard edges in outer ring (NA type, RNA type)

Note: NA bearing bearing radial load, small diameter, especially suitable for radial installation size limited structure, high limit speed single-row needle roller bearing inner diameter d!!) 799,!! :99 bearing outer ring with double lock ring! ; :99 bearing outer ring with double guard side double row needle roller bearings!" ) 799

RNA is suitable for structures whose radial mounting size is limited. The journal surface is directly used as the rolling surface. 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 guard side 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 kind of 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 with appropriate amount of grease before installation. In general, after assembly, BK type bearings need not be lubricated again for bearing without extended end of journal. End face closure plays a sealing role and can withstand small axial travel power. SUNTHAI bearing