1, bearing models of choice: bearing type is normally provided by the user's technical staff supporting the product under the conditions of use and to withstand load bearing selection. Operations are mainly to understand the user's actual load is consistent with the selected bearings, if the bearings fail to use requirements, recommends that customers re-election as soon as possible models, but unless special products in the choice model generally will not have any problem.
2, bearing clearance of the options: the user purchase bearings are normally only informed of what type, grade, very few will have the bearing clearance request, the business must ask what the conditions of use bearings, which bearing speed, temperature, to meet the tolerances are directly related to the bearing clearance option. Air Conditioner Bearings Usually in the 3500 r / min rotational speed of the motor they use the following CM clearance, such as the high-temperature high-speed motor requires a relatively large clearance. After the bearing clearance in the assembly because of the rise within a large and cylindrical hole narrowing caused by reduction in the amount of clearance reduction in the amount of interference = × 60% (except for bearing chamber is aluminum). For example bearing assembly of pre-clearance is 0.01mm, assembly of interference volume 0.01mm, then the bearing assembly after the clearance of 0.004mm. In theory, zero clearance bearings in life, when the noise and achieve the best state, but in actual operation, taking into account the temperature rise and other issues, the bearings in the assembly after the clearance of 0.002mm-0.004mm better.
3, oil choice: the choice of oils and fats generally based on the bearing rotational speed, temperature conditions, noise and starting torque required in areas such as choice, demanding that business people are well aware of the performance of a variety of oils and fats.
4, bearing seal types of options: the lubrication of bearings can be divided into oil lubrication and grease lubrication. Oil-lubricated bearings are generally chosen the form of bearings, grease lubricated bearings generally use dust cover or rubber seals seal. Dust Cover for a good part of high temperature or use of the environment, seals sub-contact seals and seal two kinds of non-contact, contact-type sealing dust starting torque of good performance, but large, non-fit seal starting torque is small, but the sealing performance did not contact well.
2, the bearings should be used with Notes
1, shaft and bearing chamber tolerances of choice and control: bearing pressed into the bearings should be flexible and not block a sense of rotation. Apparent rotation if not flexible axis indicates the size of too big tolerances to be reduced. Such as bearings pressed into the shaft rotation after the hand-obvious "imperfections" sense, it may be too much tolerance of the shaft or shaft roundness bad. Therefore, a good shaft and bearings in the control room when you want to control a good tolerance roundness, many domestic manufacturers currently control only for tolerance, there is no right to control roundness.
2, bearing assembly ways: because bearings are high-precision products, such as improper assembly is very easy to damage the bearing channel, leading to bearing damage. Bearing in the assembly should be a dedicated mold and can not beat, in the pressure into the shaft can only force a small circle, press circle and can only force big circle. Assembly to request use of pneumatic or hydraulic, in the press-fit when the level of the upper and lower die to remain outside the state, if inclined channel will lead to bearing damage due to power, leaving guide ring produced bearings.
3, the assembly of foreign bodies to prevent: bearings fitted to the rotor when it is easy to do Dynamic Balance Dynamic Balance generated when iron filings into the bearings inside, it is best to do pre-loaded bearing dynamic balancing. Some manufacturers in order to facilitate assembly, the assembly room at bearings coated with some oil or grease lubrication effect, but often the operator is difficult to control the amount of good, if the oil or grease in the bearing plot to stay indoors more, in the bearing rotation is very easily along the shaft into the bearings inside. Bearing chamber is best not painted oil or grease, such as non-coated bearings shall not be will have to control a plot to stay indoors.
4, paint rust prevention: paint rust is characterized by a multiple in the sealed-type motor, motor assembly sounds good, but put in the warehouse for some time, the motor abnormal sound a substantial change, remove bearings are the phenomenon of serious rust. Past many manufacturers would be seen as bearing problems, through our continuous publicity, and now electric plant has been realized that the main problem is the insulating paint. The problem was mainly due to insulating paint out of the acidic volatile substances in a certain temperature, humidity, formed under the corrosive substances, the channel bearing corrosion results in bearing damage. The problem at present can only be a good choice of insulating paint, and dried for some time after the ventilation assembly.
Bearing life is with the manufacture, assembly, using all closely related, and must do a good job in every situation in order to enable the functioning of bearings in the best condition, thus extending bearing life.
