Preventive measures for running noise and overheating of bearings

When the grease performance of the bearing is poor under the radial load, the "click, click" noise will be heard at the initial stage of operation, which is mainly due to the noise caused by the sudden acceleration of the rolling body and the collision with the cage after the rolling body leaves the load area. this impact sound is inevitable but disappears after running for a period of time.

The measures to prevent cage noise are as follows:

In order to make the rotation movement of the cage stable, the ring guide mode should be adopted as far as possible and attention should be paid to the full lubrication of the guide surface, and the structure of tapered roller bearings under high-speed working conditions should be improved. The L-shaped cage guided by the roller is changed into the Z-shaped cage guided by the ring edge.

When the bearing rotates at high speed, the vibration amplitude of the cage of the bearing with large pocket clearance is much larger than that of the cage with small pocket clearance, so the value of pocket clearance is particularly important.

Attention should be paid to reducing radial clearance as much as possible.

As far as possible to improve the manufacturing accuracy of the holding price and improve the surface quality of the cage is helpful to reduce the noise caused by the collision or friction between the rolling body and the cage.

Actively adopt advanced cleaning technology to effectively and thoroughly clean the spare parts and closed products to improve the cleanliness of the bearing.

Tolerance selection and control of shaft and bearing chamber: the bearing should rotate flexibly without blocking feeling after pressing in. If the rotation is obviously inflexible, it indicates that the size of the shaft is too large and the tolerance should be adjusted down. If the tapered roller bearing is pressed into the shaft and turned by hand, it may be that the tolerance of the shaft is too large or the roundness of the shaft is not good. Therefore, it is necessary to control the roundness when controlling the tolerance of the shaft and bearing chamber. at present, many domestic manufacturers only control the tolerance, not the roundness.

Bearing assembly mode: because the bearing is a high-precision product, such as improper assembly is easy to cause damage to the tapered roller bearing channel, resulting in bearing damage. The bearing should have a special mold when assembling, and can not be knocked at will. When pressing into the shaft, only a small circle can bear the force, and when pressing a large circle, only a large circle can be subjected to force. When assembling, it is required to use air pressure or hydraulic pressure, and the upper and lower touch should be outside the horizontal state when pressing. If there is an inclination, the bearing channel will be damaged due to force, which will lead to the guide sound of the bearing.

Prevention of assembling foreign body: when the tapered roller bearing is installed on the rotor for dynamic balance, it is easy to put the iron filings produced during dynamic balance into the bearing, so it is best to do dynamic balance before installing the bearing. In order to facilitate assembly, some manufacturers apply some oil or grease to the bearing room to achieve the effect of lubrication, but it is often difficult for operators to control the quantity well, if more oil or grease is accumulated in the bearing chamber, it is easy to enter the bearing along the shaft when the bearing rotates. It is best not to apply oil or grease to the bearing chamber, and if you have to apply it, you should control that there is no accumulation in the bearing chamber.

Prevention of lacquer rust: the characteristic of lacquer rust is that it often occurs in the sealed motor, and the sound of the motor is very good during assembly, but after putting it in the warehouse for some time, the abnormal noise of the motor becomes very loud, and the tapered roller bearing has serious rust. In the past, many manufacturers will think that it is the problem of bearings, after our continuous publicity, now the motor factory has realized that it is mainly the problem of insulation paint. The main reason for this problem is that the acidic substance volatilized from the insulating paint forms corrosive substances at a certain temperature and humidity, which leads to bearing damage after corrosion of the bearing channel. At present, the problem can only be the selection of good insulating paint and assembly after drying and ventilation for a period of time.