INA needle roller bearing

INA needle roller bearings are roller bearings with cylindrical rollers, which are thin and long relative to their diameter. Such rollers are called needle rollers. Despite having a smaller cross section, the bearing still has a high load carrying capacity and is therefore particularly suitable for applications where radial space is restricted. According to the application where the radial space is restricted. According to different use occasions and different optional occasions, bearings without inner rings or needle roller and cage assemblies can be selected. At this time, the surface of the journal and the surface of the shell hole matched with the bearing are directly used as the inner and outer rolling surfaces of the bearing. The load capacity and running performance are the same as those of the bearing with rings. The hardness, machining accuracy and surface quality of the raceway surface of the shaft or housing hole should be similar to the raceway of the bearing ring. This type of bearing can only bear radial loads.


Precautions
1. The roundness of the shaft and the seat hole and the verticality of the shoulder should be required according to the corresponding accuracy of the bearing.
2. It is necessary to accurately calculate the interference fit of the rotating ferrule and the proper fit of the fixed ferrule. The burning interference of the rotating ferrule should also be small within the possible range. As long as the influence of thermal expansion at working temperature and the influence of centrifugal force at high speed are ensured, it will not cause creeping or sliding of the tight-fitting surface. According to the size of the working load and the size of the bearing, the fixed ring selects a very small clearance fit or interference fit. Too loose or too tight is not conducive to maintaining the original precise shape.
3. If the needle roller bearing operates at high speed and the working temperature is high, special attention should be paid to the fit of the rotating ferrule not too loose to prevent eccentric vibration, and the fit of the fixed ferrule should not have gaps to prevent the ferrule. Deforms under load and excites vibration.
Rolling bearings are allowed to have a slight running noise during operation. If the noise is too loud or there is abnormal noise or impact, it indicates that the bearing is faulty.