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1, Failure Analysis: with round leaves on both sides of the adapter sleeve and bearing housings fixed coordination. Re-test took place the free end bearing high temperature, high vibration value of the failure, open bearings turn shelters, manual slow-rotation fan and found in roller shaft bearing to a specific location, also in non-load rolling situation. This ensures high bearing running clearance changes and the installation clearance may not be sufficient.

Learned by measuring bearing internal clearance is only 0.04mm turn uranium eccentricity up to 0.08mm; the left and right bearing span to avoid shaft deflection or bearing error is more difficult installation angle, and therefore, a large fan automatically on the heart adjustment of the spherical roller bearings. But when the bearing internal clearance less than internal bearing rolling due to movement space limitations, the automatic function of the heart affected, the vibration values ??it will rise. Bearing temperature, bearing internal clearance with with the tightness of the decreases, unable to form a lubricating curved membrane, bearing running clearance due to temperature rise and reduced to zero, if the bearing is running the heat generated is still greater than the dissipation of heat will quickly climb, At this time, if not immediate shutdown, the bearings will eventually burn the bearing inner ring and shaft with tight bearing operation in this case the reason of the unusually high temperatures.

Remedy: processing, step down adapter sleeve, re-adjust the shaft and inner ring with the tightness, replace the bearing clearance after taking 0.10mm. Re-installed restart the fan bearing vibration values ??and operating temperature were normal.