Thrust roller bearing for FAG are used to bear axial and radial combined loads that are mainly axial loads, but the radial load shall not exceed 55% of the axial load. Compared with other thrust roller bearings, this kind of bearing has a lower friction factor, higher rotation speed, and has self-aligning performance.
Related matters:
1. Selection and control of tolerance of Thrust roller bearing for FAG chamber: after the thrust roller bearing is pressed into the thrust roller bearing, it should rotate flexibly without any sense of hindrance. If there is obvious rotational inflexibility, it means that the size of the shaft is too large and the tolerance needs to be reduced. If there is an obvious "sandy" feeling after the thrust 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, when controlling the tolerances of the shaft and the thrust roller bearing chamber, the roundness must also be controlled. Many domestic manufacturers only control the tolerance and do not control the roundness.
2. Assembly method of Thrust roller bearing for FAG: Because thrust roller bearings are high-precision products, improper assembly can easily cause damage to the thrust roller bearing grooves, resulting in damage to the thrust roller bearings. Thrust roller bearings should have special molds during assembly, and cannot be knocked at will. When the shaft is pressed into the shaft, it can only bear force in a small circle, and when it is pressed in a large circle, it can only bear force in a large circle. It is required to use air pressure or hydraulic pressure during assembly. The upper and lower dies must be out of the horizontal state during press installation. If there is any tilt, the thrust roller bearing channel will be damaged due to stress, causing the thrust roller bearing to produce sound.
Single row tapered roller bearings
This kind of bearing can only limit the axial displacement of the shaft or housing in one direction and bear the axial load in one direction. Under the action of radial load, the axial force generated in the bearing must also be balanced. Two bearings should be used face to face or back to back.
Double row tapered roller bearings
This kind of tapered bearing can bear both radial load and bidirectional axial load. Bidirectional axial movement of the shaft or housing can be limited within the axial clearance range of the bearing.
Four row tapered roller bearings
The performance of this kind of bearing is basically the same as that of double-row tapered roller bearings, but it can withstand larger radial loads and has a slightly lower limit speed than double-row tapered roller bearings. It is mainly used in heavy machinery, such as rolling mills.
Multi-sealed double row tapered roller bearings
Provide long-life, multi-sealed double and four-row tapered roller bearings. Carry out a personalized new design for the bearing, change the traditional design method of fully sealed bearings, and adopt a new sealing structure type that combines sealing and dustproofing to improve the sealing effect and sealing performance. Compared with open structure bearings, multi-sealed double and four-row tapered roller bearings have a service life increased by 20% to 40%; lubricant consumption is reduced by 80%. Multi-sealed bearings are marked with the suffix code XRS.
3. Prevention of foreign matter in assembly:
When the thrust roller bearing is installed on the rotor for dynamic balancing, it is easy for the iron filings generated during dynamic balancing to enter the interior of the thrust roller bearing. Therefore, it is best to perform dynamic balancing before installing the thrust roller bearing. . In order to facilitate assembly, some manufacturers apply some oil or grease in the thrust roller bearing chamber during assembly to achieve a lubricating effect. However, it is often difficult for the operator to control the amount well. If there is a lot of oil or grease accumulated in the thrust roller bearing chamber, , it is easy to enter the interior of the thrust roller bearing along the shaft when the thrust roller bearing rotates. It is best not to apply oil or grease to the thrust roller bearing chamber. If it must be applied, it must be controlled so that there is no accumulation in the thrust roller bearing chamber.
4. Prevention of paint rust:
The characteristic of paint rust is that it mostly occurs in sealed motors. The motor sounds very good when assembled, but after being placed in the warehouse for some time, the abnormal noise of the motor becomes louder. Remove the thrust roller. The sub-bearing is severely rusted. In the past, many manufacturers thought it was a problem with the thrust roller bearings. After our continuous publicity, the motor manufacturers have 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 under certain temperatures and humidity, which corrode the thrust roller bearing grooves and cause damage to the thrust roller bearings. This problem can only be solved by choosing good insulating paint and ventilating it for a period of time before assembly.
Product Features:
The rod of the 29000 bearing is an asymmetric spherical roller, which can reduce the relative sliding of the roller and the raceway during operation. The roller is long, has a large diameter, has a large number of rollers, and has a high load capacity. It is usually used Oil lubrication, grease lubrication can be used in some low speed situations. When designing and selecting, priority should be given;
Type 80000 thrust cylindrical roller bearings, type 90000 thrust tapered roller bearings and type AXK thrust needle roller bearings can bear one-way axial load. They have much greater axial load capacity than thrust ball bearings, and are more rigid and Occupies little axial space.
Thrust cylindrical roller bearings and thrust tapered roller bearings are suitable for low-speed applications. The speed of thrust tapered roller bearings is slightly higher than that of thrust cylindrical roller bearings. Thrust cylindrical roller bearings are separate bearings that can only withstand one-way axial load and slight impact. They can limit the axial displacement of the shaft (or housing) in one direction, so they can be used for one-way axial positioning. But its load-bearing capacity is much greater than that of thrust ball bearings. When the roller rolls, due to the different linear speeds at both ends of the roller, the roller inevitably slides on the ring raceway. Therefore, the limit speed of this type of bearing is lower than that of thrust ball bearings, and it is usually only suitable for low-speed operation occasions.
The standard design of thrust cylindrical roller bearings uses machined metal solid cages. According to user requirements, cages of other types or materials can also be used. Thrust tapered roller bearings can only bear one-way axial load and can limit the one-way axial displacement of the bearing, so they can be used for one-way axial positioning. Compared with thrust cylindrical roller bearings, they have large load-bearing capacity and small relative sliding, but have lower limit speed.
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