Indentation cracks, wear, corrosion, spalling, are reflected in the bearing vibration measurement, bearing vibration of bearing damage is very sensitive, so the turbocharger bearings by using a special bearing vibration Measurer (frequency Analyzer, etc) measures the size of the vibration, through frequency not infer exceptions to the specific situation. Because of the measured values from bearing conditions of use or the sensor installation locations and different, therefore require prior to each machine analysis and comparison of measurement values to be determined benchmarks.
Because even has a slight peeling of the bearing damage, also is making an abnormal sound and irregular sound, using sound system can be resolved using acoustic logging, in operation of turbocharger scroll bearing size and sound checks play a preventive role in advance.
1. surface metal Raceway peeling
Bearing rolling element and the inner and outer ring raceways are subjected to cyclical fluctuation load on the surface, resulting in a cycle of change
Contact stress. When the stress cycle count reaches a certain number, in the rolling elements or inner and outer ring raceways produces fatigue spalling on the face. If the bearing load is too large, will exacerbate this fatigue. In addition, the Turbo bearing is not being installed, shaft bending and roller flaking can also arise. Bearing Raceway fatigue spalling can decrease the running accuracy of the shaft, body vibration and noise.
2. bearing burn
Burn on a bearing Raceway and the rolling temper. Burn normally due to insufficient lubrication, lubricating oil quality is not compliant or deterioration, such as turbocharger bearing too tight.
3. plastic deformation
Bearing raceways and rollers have uneven pockmarks on the contact surface, indicate the plastic bearing. Because of a large static bearing load or impact load, partial stress over the yield limit of material on the surface of the work, which generally occur in low-speed rotation of the bearing.
4. bearing ring cracked
Cracking housing washer could be due to bearing too tight, foreign or inner ring of the bearing is loose, turbocharger components of deformation of the bearing, install the bearing surface processing such as bad.
5. cage broken
The reason for this is a lack of lubrication, rolling breaks, skew, and so on.
6. glue the metal retainer on the rolling elements
Possible cause is the rolling was stuck in a cage or lack of lubrication.
7. seat Raceway badly worn
May be the area fall into the foreign body, grades of lubricating oil or lubricating oil is inappropriate.
If using oil-hole temperature can directly measure the bearing outer ring, is more appropriate. Under normal circumstances, Turbo bearing temperatures, bearing outside of room temperature can be based on speculation. If lubricated, install the appropriate, the bearing temperature is rising dramatically, and abnormal high temperature occurs, in which case you must stop and take the necessary precautions. Usually, temperature of the bearings as the operation began to rise slowly, 1-2 hours to stabilize. The normal temperature of the bearing due to the heat capacity of the machine, heat dissipation, speed and load another. If necessary, use heat detector to monitor bearing temperature over time and temperature alarm when exceeding a specified value or stop to prevent burning shaft accident.