SKF Thrust roller bearing

Thrust roller bearing is used to bear the combined axial and radial load dominated by axial load, but the radial load shall not exceed 55% of the axial load. Compared with other thrust roller bearings, this kind of bearing has lower friction coefficient, higher speed and self-aligning performance< br>
1. Selection and control of tolerance of thrust roller bearing chamber: the thrust roller bearing shall rotate flexibly without blocking feeling after being pressed into the thrust roller bearing. If there is obvious inflexible rotation, it indicates that the size of the shaft is too large and the tolerance should be reduced. If there is an obvious "rusty" feeling when the thrust roller bearing is pressed into the shaft by hand, it may be that the tolerance of the shaft is too large or the roundness of the shaft is not good. Therefore, when controlling the tolerance of shaft and thrust roller bearing chamber, it is also necessary to control the roundness. Many domestic manufacturers only control the tolerance and do not control the roundness

2. Assembly method of thrust roller bearing: because the thrust roller bearing is a high-precision product, if it is not assembled properly, it is easy to damage the thrust roller bearing channel, resulting in damage to the thrust roller bearing. The thrust roller bearing shall be equipped with a special die during assembly, and can not be knocked at will. When pressing the shaft, only a small ring can be stressed, and when pressing a large ring, only a large ring can be stressed. Pneumatic or hydraulic pressure is required during assembly. During press assembly, the upper and lower dies shall be outside the horizontal state. If there is inclination, the thrust roller bearing channel will be damaged due to stress, resulting in the guide sound of the thrust roller bearing

3. Prevention of assembly foreign matters: when the thrust roller bearing is installed on the rotor for dynamic balance, it is easy to enter the iron filings generated during dynamic balance into the thrust roller bearing. Therefore, dynamic balance is performed before installing the thrust roller bearing. In order to facilitate assembly, some manufacturers apply some oil or grease in the thrust roller bearing chamber for lubrication effect during assembly, but it is often difficult for operators to control the amount. If more oil or grease is accumulated in the thrust roller bearing chamber, it is easy to enter the thrust roller bearing along the shaft when the thrust roller bearing rotates. The thrust roller bearing chamber shall not be coated with oil or grease. If it must be coated, it shall be controlled and there shall be no accumulation in the thrust roller bearing chamber

4. Prevention of paint rust: paint rust often occurs in sealed motors. The motor has a good sound during assembly, but after it has been placed in the warehouse for some time, the abnormal sound of the motor becomes very large, and there is serious rust when the thrust roller bearing is removed. In the past, many manufacturers thought it was the problem of thrust roller bearing. After our continuous publicity, the motor factory has realized that the main problem is the insulating paint. This problem is mainly because the acidic substances volatilized from the insulating paint form corrosive substances at a certain temperature and humidity, which corrodes the channel of the thrust roller bearing and leads to the damage of the thrust roller bearing. The problem can only be to select good insulating paint and assemble after drying and ventilation for a period of time