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KOYO bearings in operation check is very important, cannot be ignored, mainly check the bearing lubrication of rolling noise, vibration, temperature, status, and so on. We briefly introduce the sound of rolling bearings, ball size and quality check measurement should be used to check the operation of automotive bearings in, using advanced tools can accurately figure out the problem, even has a slight peeling of the bearing damage, also is making an abnormal sound and irregular sound, using sound system to be able to tell.
KOYO bearings vibration checks, bearing failures is very sensitive, indentation cracks, wear, corrosion, spalling, are reflected in the bearing vibration measurement, therefore, through the use of special automobile bearing vibration Measurer (frequency Analyzer, etc) measures the size of the vibration, through frequency not infer exceptions to the specific situation. However each machine measured values from bearing conditions of use or the sensor installation location is different and therefore require prior to each machine analysis and comparison of measurement values to be determined criteria.
KOYO bearing parts in use under the influence of high temperature, would not receive the timely cool parts organizations produce high-temperature tempering or quenching phenomena known as the burn for the second time.
Burn mainly due to poor lubrication, neck loads resulting from improper configuration, clearance is poorly chosen, bearings, bad contact of the Raceway surface and stress caused by too large because of the cold. Such as;
1) axially free bearing, if external factors too tight, unable to move around in a shell-hole;
2) bearing operating temperature, the thermal expansion of the shaft caused a great deal of axial force, and when unable to axial movement of the bearing;
3) due to insufficient lubrication or lubricant selection is not reasonable, quality issues, such as aging and deterioration;
4) inside and outside because of the operating temperature difference, plus clearance improper external expansion of small internal interference leading to rapid rise in temperature of the bearings;
5) KOYO bearings to withstand the load too large and its uneven charge distribution, formation stress concentration;
6) part surface roughness, resulting in poor contact or oil film formation difficult.
Morphology of burns can be judged according to the color on the surface of the small. KOYO bearings in use as lubricants, temperature, corrosion and other reasons, the parts vary, color mainly yellowish-red, yellow, Brown, purple, blue and dark blue, light yellow, yellow, red-brown dust in color (see relevant content), if purple blue or dark blue fills the burn occurs. Burns easily causes reduced part surface hardness or a micro-pattern.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7913A5DF NSK | 65 | 90 | 13 |
| 7312BDF NSK | 60 | 130 | 31 |