Vibrations cause the overall eccentric bearing failure

Generally speaking, the whole of the eccentric bearing rolling bearing itself does not produce noise. Often feel 'bearing noise' is in fact the bearing directly or indirectly, with the surrounding structure vibration sound effects. This is why many times the noise can be seen as involving the whole eccentric bearing vibration problem of application. Due to loading quantity change of vibration roller when a load on a bearing radial load, the number of rolling element bearing load will be a slight change in the operation, i. e. , 2 - 3 - 2 - 3. 。 。 。 This caused the load in the direction of migration. The resulting vibration is inevitable, but can be by axial preload to ease, loading in all rolling body. The waviness on bearing ring of the self-contained parts or close coordination between the shaft and bearing ring with adjacent components are likely to match the shape and deformation. If there is a deformation, can produce vibration in the operation. Therefore, the bearing and the shaft are machined to the required tolerance is very important. Local damage due to the operation or installation errors, a small number of bearing raceway and rolling element may be damaged. In running, rolled damaged the eccentric bearing parts will produce a certain vibration frequency. Vibration frequency analysis can identify the damaged bearing parts. The vibration behavior of applications in many applications, the bearing stiffness with the surrounding the stiffness of the same structure. Due to this feature, as long as the correct choice bearing ( Including the preload and clearance) And its application in the configuration, it is possible to reduce the application of vibration. First of all, reasonable structure design and equipped with advanced, just can have a long bearing life. Bearing manufacturing generally go through forging, heat treatment, cutting, grinding and assembly, and multi-channel processing operations. The rationality of the processing technology, advanced, stability will also affect the service life of bearing. Affecting the overall product of eccentric bearing the quality of heat treatment and grinding process, tend to have a more direct relationship with bearing failure. In recent years the study of metamorphic layer of bearings working surface show that the grinding process and is close to the surface quality of the bearing. Bearing materials of metallurgical quality were the main factors influencing the premature failure of the rolling bearing. As metallurgy technology, For example, the bearing steel vacuum degassing, etc. ) Progress, raw material quality is improved. Raw material quality factor in the bearing failure analysis share has declined obviously, but it is still one of the main influence factors of bearing failure. Select material adequacy is still bearing failure analysis factors must be considered. Overall, the main task of the eccentric bearing failure analysis is based on a lot of background material, analyze data and failure forms, find out the main factors of bearing failure, so that the improvement measures are put forward, prolonging bearing, avoid premature failure of the bearing of the sudden. Phenomenon: 1) The engine idle speed has no obvious noise during operation, and high speed in the thrum 'giggle' ( ) emitted from crankcase 2) Hurry go after loosening the gas instantaneous sound more obvious. 3) No obvious change after the temperature rise. When the load increases, the sound is growing. 4) Sound more thrust angular contact ball bearing sound slow, short. Reasons: 1) Bearing and shaft neck wear too much, the radial clearance is too large. 2) The bolt bearing cover is loose. 3) Bearing alloy ablation or fall off. 4) Journal circles. 5) Bearing and the bearing relative rotation. Diagnosis: 1) Engine speed by the idle speed to medium speed when excessive noise is clear, with higher speed, the noise is more outstanding, for bearing ring. 2) Fire test of a cylinder is carried out, the sound diminished or disappeared, for the cylinder bearing ring. 3) No matter what speed and temperature are sound and engine vibration, do fire test sound doesn't change, is for the bearing alloy ablation.