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The cause of overheating of NTN bearing and the solution and countermeasures of noise
Source: China Bearing Network Time: 2018-03-03
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.2) NTN bearing smooth grease is too small, too much or there are iron scraps and other impurities. The capacity of the shaft smooth grease should not exceed 70% of the total volume; those with impurities should be replaced.
.3) The shaft cooperates with the NTN bearing too tightly or too loosely. When it is too tight, it should be ground from the head; when it is too loose, it should be set to the shaft.
.4) NTN bearing and end cap cooperation is too tight or too loose. NTN bearing chamber is processed when it is too tight; when it is too loose, steel sleeve is set in the end cover.
.5) The motor's two-head cap or NTN bearing cap device is defective. Install or flatten the end cap or NTN bearing cap stop; tighten the screw.
.6) The belt is too tight or the coupling device is defective. Adjust the belt tension; proofread the coupling.
.7) Sliding NTN bearing has too little smooth oil, impurities or oil ring stuck. It should be like refueling, replacing new oil; repairing or replacing oil ring.
NTN bearing noise solution NTN bearing uses the noise caused by the problem; common there are two kinds of flaws and dust sound; the following are as follows: (1) the sound of the flaw and its control method roll the NTN bearing's tumbling appearance if there is crack, Indentation or rust; periodic oscillations and noises like riveted rivets; their periodicity can be fixed but mostly related to the rotational speed; the scars will occur in succession on the channel; the scars will be on the steel ball. Hidden time; and this noise has a certain change with the device and smooth conditions.
This kind of noise control method is: the NTN bearing can not be tapped when the device is installed; when the NTN bearing is assembled with the shaft and then loaded into the NTN bearing seat, the NTN bearing is prevented from being inclined, and the NTN bearing is prevented from being rusted during storage and the shock oscillation is avoided during transportation. Apply smooth grease with high viscosity.
(2) Dust sound and its control method There are dust and other foreign objects in the rolling bearing; there will be non-periodic oscillations and so-called dust sounds; its oscillation and noise are uncertain; and with or without.
The dust sound control method is: to improve the removal method of NTN bearing; before the device, the NTN bearing, shaft, seat hole and the general matching parts are all clean and clean, remove the foreign matter in the smoothing agent, improve the sealing of the NTN bearing, and avoid using the data. Plastic cage with pure or embedded foreign objects.
(3) Noise caused by smooth elements and countermeasures Smooth agent selection fault, lack of smoothing agent or aging hardening; can cause NTN bearing oscillation and noise; and this noise has no necessary rules. Regarding this situation; Suitable smoothing agent; adjust its smoothing dose; extend the service life of smoothing agent and reasonably determine the replacement cycle.
The noise associated with the host and its countermeasures are not caused by the NTN bearing alone; therefore, it is futile to find the cause from the NTN bearing; it should be paid attention to by the host; if necessary, the function of the host should be improved. Common buzzer and rack resonance.
(1) The buzzing sound of the motor and its countermeasures The axial oscillation of the motor shaft will incur a large high-frequency noise-beep; its frequency is the same as the axial oscillation frequency; so it can be changed without change. The method of avoiding buzzing is the same as avoiding axial oscillation.
(2) Resonance sound of NTN bearing frame and its countermeasures The axial natural oscillation of the outer ring quality system causes the axial tortuosity of the NTN bearing frame to oscillate naturally; a noise called resonance sound occurs. Preloading is added. The method can improve the axial natural frequency of the outer ring quality system, damage the resonance condition; reduce the noise.
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