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In general, the filling amount of grease in Timken bearing always exceeds the actual demand for Correct Use direct lubrication. It is on the holder and in the cavity of the bearing cover, and forms a contour on the periphery of the rolling element.
During this process, the bearing temperature rises rapidly due to the resistance of excess grease. Although most of the excess grease is squeezed out at the initial stage of operation,
and the grease squeezed in the accessories of the raceway may still be brought into the raceway by the rotating rolling element. In the Correct Use initial stage of the bearing, most of the grease is quickly squeezed out of the raceway (less than one minute),
and the accumulated grease is discharged in a small amount while circulating with the rotating body of the bearing. At this time, the bearing Wendu continues to rise until all the excess grease is discharged,
which can be called the running in stage of grease. According to the quality and filling amount of grease in the bearing structure, Correct Use this period may last for more than ten minutes or even several hours.
After the remaining grease is completely discharged, the remaining small amount of grease forms a thin layer of grease film on the mutual contact surface of Correct Use the rolling body, raceway and cage through the action of a wedge, so as to enter the normal rolling stage of the bearing.
At this time, the temperature gradually decreases and reaches equilibrium. In other words, the long-term lubrication mainly depends on this layer of grease film. In addition, during the long-term operation of the bearing,
the lubricating grease on the contour near the rolling element and raceway and on the cage will shrink and separate part of the base oil, which will also Correct Use supplement the lubrication after flowing into the raceway.
(good effect can be achieved only by selecting the appropriate one)
Timken bearings are mixed with Correct Use water, acids or paint and other dirt to play a corrosive role
Timken bearing is clamped flat by the seat hole (the roundness of the seat hole is not good, or the seat hole is distorted and not straight)
The sizing block on the bottom surface of Timken inlet bearing seat is uneven (resulting in seat hole deformation and even cracks on Timken bearing seat)
There are sundries in Timken Correct Use bearing seat hole (residual chips, dust particles, etc.)
The clearance of Timken bearing is too small and it is too tight during rotation (the tightening sleeve is too tight)
Insufficient lubrication (oil level is too low, oil or grease leaks through the seal)
The clearance of Timken bearing is too small (improper matching selection)
Eccentric sealing ring (touching adjacent parts and rubbing)
Timken shaft bears additional load (Timken shaft bears axial Correct Use tightness, or there are two fixed end Timken bearings on one shaft)
The fit between Timken bearing and shaft is too loose (the diameter of shaft is too small or the tightening sleeve is not tightened)
Timken bearings are mixed with impurities such as sand or carbon particles to act as abrasives
The diameter of the seat hole is too small (resulting in too high temperature of Timken bearing)
The diameter of Timken bearing seat hole is too large and the actual fit is too loose (Timken bearing temperature is too high – outer ring slips)
Timken bearing seat hole becomes larger (Timken bearing seat hole of non-ferrous metal is enlarged or becomes larger due to thermal expansion)
Timken bearing has noise (caused by roller end face or steel ball Correct Use slipping)
Excessive thermal elongation of shaft (Timken shaft bears static indeterminate axial additional load)
The shaft shoulder is too large (touching the seal of Timken bearing and rubbing)
The shoulder of the seat hole is too large (it distorts the seal of Timken bearing)
The clearance of labyrinth seal ring is too small (friction with shaft)
The teeth of the lock washer are bent (touching the Timken bearing and rubbing)
Improper position of oil slinger (touching flange cover and rubbing)
Timken bearing is discolored and deformed by heat (caused by removing Timken bearing by heating with spray gun)
The shaft is too thick, which makes the actual fit too tight (resulting in too high temperature or noise of Timken bearing)
Timken bearing has noise (Timken bearing has fretting abrasion)
There are pressure pits on the steel ball or roller (caused by knocking Timken bearing with a hammer during installation)
Timken bearing has noise (interference from external vibration source)
Based on the comparison of the above reasons, you can roughly analyze the specific reasons for the sound of Timken bearing.