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INA needle roller bearing is a roller bearing with cylindrical rollers. Compared with its diameter, the rollers are thin and long. This kind of roller is called needle roller. Although it has a small section, the bearing still has high load bearing capacity. Therefore, it is especially suitable for occasions with limited radial space. According to the situation where the radial space is limited. According to different application occasions, bearings without inner rings or needle roller and cage components can be selected. At this time, the journal surface and shell hole surface matched with the bearing are directly used as the inner and outer rolling surfaces of the bearing. In order to ensure that the load capacity and operation performance are the same as those of the bearing with ferrule, the hardness of the raceway surface of the shaft or shell hole, The machining accuracy and surface quality shall be similar to the raceway of bearing ring. This kind of bearing can only bear radial load.
matters needing attention
1. The roundness of shaft and seat hole and the perpendicularity of retaining shoulder shall be required according to the corresponding accuracy of bearing.
2. It is necessary to accurately calculate the interference of the rotating ferrule and the appropriate fit of the fixed ferrule. The burning interference of rotating ferrule should also be small within the possible range. As long as the influence of thermal expansion under working temperature and centrifugal force under high speed are ensured, the creep or sliding of tight fitting surface will not be caused. According to the working load and bearing size, the fixed ring selects a very small clearance fit or interference fit. Too loose or too tight is not conducive to maintaining the original accurate shape.
3. If the needle roller bearing operates at high speed and the working temperature is high, special attention should be paid to the matching of the rotating ring not to be too loose to prevent eccentric vibration, and the matching of the fixed ring should not have clearance to prevent the ring from deforming and exciting vibration under load.
The rolling bearing is allowed to make slight running noise during operation. If the noise is too loud or there is abnormal noise or impact sound, it indicates that the bearing is faulty.
matters needing attention
1. The roundness of shaft and seat hole and the perpendicularity of retaining shoulder shall be required according to the corresponding accuracy of bearing.
2. It is necessary to accurately calculate the interference of the rotating ferrule and the appropriate fit of the fixed ferrule. The burning interference of rotating ferrule should also be small within the possible range. As long as the influence of thermal expansion under working temperature and centrifugal force under high speed are ensured, the creep or sliding of tight fitting surface will not be caused. According to the working load and bearing size, the fixed ring selects a very small clearance fit or interference fit. Too loose or too tight is not conducive to maintaining the original accurate shape.
3. If the needle roller bearing operates at high speed and the working temperature is high, special attention should be paid to the matching of the rotating ring not to be too loose to prevent eccentric vibration, and the matching of the fixed ring should not have clearance to prevent the ring from deforming and exciting vibration under load.
The rolling bearing is allowed to make slight running noise during operation. If the noise is too loud or there is abnormal noise or impact sound, it indicates that the bearing is faulty.
