Release Date：2023-10-12 20:03:12
The preloading force of self-aligning roller bearings is carried out at room temperature, but when in operation, the driving shaft generated by the system's micro stretching temperature rise will change the bearing preloading force. Therefore, the setting of preloading force should take this factor into consideration.
It requires the size of the ability, speed, and reasonable use of self aligning roller bearing preload for other condition settings to ensure transmission life. If the pre tightening force is too large, power consumption may even lead to overheating. If the preload is too small, the body load, shaft rolling, and the difference between the outer rings cause jumping, running, and transmission accuracy to reduce noise increase, which affects gear meshing and severely damages teeth and bearings.
According to the assembly of different self-aligning roller bearings, for example, by directly compressing the inner ring of the bearing through axial compression, the bearing pre tightening nut rotates and the inner and outer rings are rotated to eliminate the gap and achieve the purpose of bearing pre tightening force. Realizing common use: First, far beyond the pre installed bearings, the nuts are tightened by 1/4 turns. The assembly method has the advantages of low investment, simplicity, practicality, and consistent excellent quality, and can be used for tapered roller bearings.
1. Electric heating plate method: Place the bearing on an electric heating plate with a temperature of 100 ℃ for a few minutes. This method is the simplest, and flipping it several times can make the shaft bear heat evenly, and the efficiency is also high. This method can be used for both large and small self-aligning roller bearings
2. The electric furnace heating method places the bearings in a closed automatic temperature control electric furnace for heating, with uniform heating, accurate temperature control, and fast heating, suitable for heating many bearings in a batch
3. Induction heating method utilizes an induction heater to quickly, reliably, and cleanly heat the self-aligning roller bearing to the required temperature, which is particularly suitable for situations where the inner ring is tightly fitted. As only the inner ring is heated, the outer ring receives less heat, making it easier to install on the shaft and also easier to fit into the seat hole
4. Electric bulb heating method uses a 50W electric bulb to heat self-aligning roller bearings, ensuring a heating temperature of around 100 ℃. Smaller bearings can be directly placed on the bulb, while larger bearings can be placed inside the conical cover of the bulb. The conical cover can prevent heat loss from the bulb and ensure even heating. The conical cover can be adjusted up and down to adapt to heating different sizes of bearings within a certain range. If using a far-infrared bulb, the direction of the bulb should be downward, To prevent infrared radiation from harming human eyes, this type of light bulb can save energy. The bulb heating method is suitable for small quantities that are not frequently needed; In situations where bearings need to be heated, light bulbs can also be used for lighting purposes, and no other equipment is required
5. Oil tank heating method is a widely used traditional heating method. A metal mesh is installed at a distance of 50-70mm from the bottom of the oil tank, and the bearings are placed on the mesh. The large bearings should be lifted with hooks, and the bearings should not be directly placed at the bottom of the tank to prevent local overheating of the bearing parts in contact with the bottom of the tank, or the dirt deposited at the bottom of the tank from entering the bearing oil tank heating method. The following precautions should be taken: non corrosive mineral oil with good thermal stability should be used, preferably transformer oil, Both the oil and the container should be kept clean. The capacity of the oil tank should be determined by the size and amount of oil of the heated self-aligning roller bearing. If the container is too small, during continuous operation, the oil temperature of the bearing will quickly drop as soon as it is inserted, which will not be effective
