INA needle roller bearings are roller bearings with cylindrical rollers that are thin and long relative to their diameter. This type of roller is called a needle roller. Despite their small cross-section, the bearings have a high load-carrying capacity and are therefore particularly suitable for applications where radial space is limited. According to the situation where the radial space is limited. Depending on the application, you can choose a bearing without an inner ring or a needle roller and cage assembly. At this time, the journal surface and shell hole surface matching the bearing directly serve as the inner and outer rolling surfaces of the bearing. To ensure The load capacity and running performance are the same as those of bearings 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 kind of bearing can only bear radial load.
Precautions
1. The roundness of the shaft and seat hole and the verticality of the shoulder should be required according to the corresponding precision of the bearing.
2. It is necessary to accurately calculate the interference fit of the rotating ferrule and the appropriate fit of the fixed ferrule. The amount of interference of the rotating ring should be as small as possible. As long as the influence of thermal expansion at working temperature and the influence of centrifugal force at high speed are ensured, the creep or sliding of the tight fit surface will not be caused. According to the working load and bearing size, the fixed ferrule adopts a minimum clearance fit or an 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 operating temperature is high, special attention should be paid to the fit of the rotating ferrule not to be too loose to prevent eccentric vibration, and the fit of the fixed ferrule to prevent gaps from occurring. Deforms under load and excites vibrations.
Rolling bearings are allowed to have a slight running sound during work. If the sound is too loud or there is abnormal noise or impact, it indicates that the bearing is faulty.
