The speed limit bearing refers to not cause friction heat burns and continuous rotation of the boundary values. Non-standard speed limit bearing is bearing type, size, precision, lubrication, oil gap, various influence factors of load and so on, but the most important thing is the lubricant and ambient temperature effects. Rotating at high speed, especially the speed of approaching or exceeding the speed limit size recorded in the list, mainly should pay attention to the following matters:
(1) the use of high precision bearings;
(2) add to the analysis of non-standard bearing internal clearance, bearing internal clearance considering temperature rise is reduced;
(3) analysis of lubrication. Using suitable for lubrication of high speed rotating, spray lubrication, oil mist lubrication and oil-air lubrication, lubrication.
(4) analysis of cage materials type. For high-speed rotation, suitable for copper alloy or phenolic resin cutting holder. There is also suitable for synthetic resin molding high-speed rotating cage;
For small machinery, can be rotated by hand to confirm whether the rotation is smooth. Inspection items include:
1, there is no because the foreign bodies, scars, indentation caused by poor functioning;
2, there is no due to poor installation, mounting process arising out of the bad moment instability;
3, there is no caused by clearance is too small, installation error, sealing friction force is too large and so on.
However, for large machinery can not be manually rotated. So the no-load starting immediately after power cut, mechanical idling, check whether the vibration, noise, rotating parts are in contact and so on, confirmed no abnormal, into the dynamic operation.
Power operation is from the no-load speed, slowly increased to the rated operating condition. Test run of issues: whether there is abnormal sound, change, non-standard bearing temperature of the lubricant leakage or discoloration etc.. If abnormal, should immediately suspend the operation, inspection machinery, necessary to remove the bearing inspection.
Non-standard check bearing temperature. Usually according to the external temperature of the bearing seat that. But the direct measurement of the bearing outer ring with oil hole temperature more accurately. Bearing temperature rises gradually from running, usually 1~2 hours after the temperature stability.
If the bearing mounting bad, the temperature will rise sharply, abnormal high temperature. The reason such as excessive lubricant, the bearing clearance is too small, poor installation, seal friction is too large. High-speed rotation of the occasion, lubrication bearing structure, the choice is also the cause of the error.
Non-standard bearing sound check. The rotating tone with a stethoscope to check, such as a metallic noise, strong noise, irregular, abnormal sound. The noise due to poor lubrication, shaft or housing bad precision, bearing damage, foreign intrusion etc..



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