With the progress and development of society, mechanization is widely used in production and life. Bearing is an indispensable part of the machinery, and the scope of its use will also be wider and wider, because bearing as long as there is a rotating place.

The bearing is mainly to support and reduce friction in machinery, so the accuracy and noise of the bearing are directly related to the use and life of mechanical.

However, business personnel always encounters some customers who are not efficient even if they use the best bearings or imported bearings, which is related to the use and selection of bearings. Some people may say, “The use of bearing and choice is the user’s business, and I only sell what the user wants.” However, as a qualified salesman, in addition to being proficient in his own product knowledge, you must also be proficient in the use of products, that is, doctors’ sales, and choose the best supporting bearing according to the performance of the user’s supporting products and use conditions. This is currently the popular manufacturing and sales of major companies in the world. This method has also achieved good results since the implementation of Renmin Group.


Because the types of bearing are widely wide, the following will mainly analyze the use and selection of deep gap bearing with the widest range of use. It is hoped that people with less recognition of bearing can deepen their understanding of bearings.

Choice of the bearings

1. Selection of bearing models:

The bearing model is generally selected by the user’s technicians based on the conditions of the supporting products and the withdrawal of the load. The business personnel mainly understand whether the actual load of the user is consistent with the selected bearing. If the bearing does not meet the requirements of the use, the customer should be recommended to make the model as soon as possible, but there is generally no problem in the selection model unless special products are selected.

2. Selection of bearing gap:

When buying bearings, users generally only inform what models and levels they are, and rarely require requests for the gaps of the bearings. Business staff must ask the use conditions of the bearing, where the speed, temperature, and tolerance of the bearing are directly related to the bearings. Selection of the gap. Most of the motors with speeds below 3500 rpm/cents are used in CM gaps. For example, high -temperature and high -speed motors are required to use relatively large gaps. After assembly, the bearing gap will be reduced due to the increase in the inner hole and the reduction of the outer circle. The reduction of the gap = over -profit volume × 60 % (except the bearing room is aluminum). For example, the bearing is 0.01mm, and the over -profit volume is 0.01mm during assembly, and the gap after bearing is 0.004mm. In theory, the noise and life of the bearing reached the best state during the zero gap. However, in actual operation, the problem of temperature rise is considered. After the assembly, the gap is 0.002mm-0.004mm.


3. Selection of fat:

The choice of oil is generally based on the speed, temperature resistance, noise requirements, and starting power of the bearing. It is required that business personnel are required to know the performance of various oils.

4. The choice of bearing seal type:

The lubrication of the bearings can be divided into oil lubrication and fat lubrication. Oil lubricating bearing is generally used for form bearing. The fat lubrication bearing is generally seal with dust cover or rubber sealing parts. The dust cover is suitable for high temperature or good environment. The sealing parts are divided into contact sealing and non -contact sealing. The contact -type sealing dustproof performance is good, but the power torque is large. There is no contact type.

Precautions should be taken when using bearing


1. The choice and control of the tolerance of the shaft and bearing room:

After the bearing pressure into the bearing, it should rotate flexible and unobstructed. If it is not flexible, it means that the size of the axis is too large, and the tolerance should be reduced. If the shaft pressure is rotated after the axis is in the shaft, it may be a significant “rustling” feeling, which may be that the tolerance of the shaft may be too large or the roundness of the axis is not good. Therefore, the circularity must also be controlled when controlling the tolerance of the shaft and the bearing room. At present, many domestic manufacturers only control the tolerance and do not control the circularity.


2. The assembly method of bearing:

Because bearings are high -precision products, such as improper assembly can easily cause damage to the bearing channel, causing bearing damage. The bearing should have a dedicated mold when assembly. You cannot knock at will. When pressing into the axle, you can only stress in a small circle. When the lap is crushed, you can only stress in large circles. When assembling, it is required to use air or hydraulic pressure. The upper and lower molds should be horizontal in the upper and lower molds during the installation.

3. Prevention of assembly foreign matter:

When the bearing is mounted on the rotor, it is easy to enter the bearing inside the bearing when the motion balance is easily balanced, so it is best to make the motion balance before the bearing of the bearing. In order to assemble for convenience, some manufacturers apply some oil or oil to lubricating effects in the bearing room during assembly, but it is often difficult for the operator to control the amount. It is easy to enter the bearing inside the shaft. It is best not to apply oil or fat in the bearing room.

4. Prevention of rust:

The rust is characterized by the multiple sealing motors. The motor sounds well during assembly, but after putting some time in the warehouse, the abnormality of the motor becomes very large, and the bearing is severely rusting. In the past, many manufacturers would think that it was the problem of bearing. After our continuous publicity, the motor factory has now realized that it is mainly an insulating paint. The problem is mainly because the acidic substances volatilized by inside paint paint have corrosive substances under a certain temperature and humidity, which causes the bearing channel to cause damage to the bearing channel. This problem can only be used for insulating paint, and assembled after ventilation after drying.

The life of the bearing is closely related to manufacturing, assembly, and use. It must be done in each link to make the bearing in the best operating state, thereby extending the life life of the bearings.

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