NTN bearings operating vibration damage examination method

In the effects of the rolling load of quantity, when a bearing radial load, the load of rolling amount will be a slight change of operation, including: 2 - 3 - 2 - 3. 。 。 。 This caused the load in the direction of migration. The resulting vibration is inevitable, but it can be loaded in advance, in order to reduce all roller axial loading. In operation, across the damaged wheel bearing parts rolling will produce a particular vibration frequency. Frequency analysis can identify damage NTN bearing parts. This principle has been used to condition monitoring equipment, to detect the situation of the bearing damage. The temperature will rise sharply, the abnormal high temperature. The reason such as lubricant, bearing clearance is too small, too much bad installation, excessive friction sealing device, etc. High-speed rotation, imported bearing structure, selection of lubrication method error is also the reason. The relationship between the shaft and bearing, under the condition of close contact with the bearing ring, can be compatible with the shape of the adjacent parts deformation. If there is distortion in the operation may cause vibration. Therefore, wheel bearings and shaft processing requirements of tolerance is very important. If you run in the pollution of the environment, impurities may enter the NTN bearing rolling. Vibration depends on the number of contaminants in the rolling, the size and composition, although frequency does not produce the typical form, its reason is poor lubrication, shaft or precision bearing, bearing damage, foreign bodies, such as intrusion, but you can hear the sound of a kind of annoying. Check general inspection in two different conditions: the first is that small NTN bearing small machinery to rotate so as to determine the success or failure of bearing rotation. This kind of circumstance usually depends on whether the NTN bearing caused by foreign bodies, indentation, and scars of seams, which are lead by bad bad installation seat processing the imbalance of the rotating torque, the clearance is too small, installation error, seal friction caused by excessive torque and so on. The second is a large machine can't turn this case large machinery from manual rotation manually, so no load starting immediately after turn off the power, inertia operation. Check whether there is presence of vibration, noise, rotating parts contact and so on. Confirmed after no abnormalities, into power operation.