What Is a Spherical Roller Bearing?

Spherical roller bearings have double-row rollers, the outer ring has a common spherical raceway, the inner ring has two raceways and is inclined at an angle relative to the bearing axis. This ingenious structure makes it have self-aligning performance, so it is not easily affected by the angle of the shaft and the bearing box seat on the error or the bending of the shaft. In addition to bearing radial loads, the bearing can also bear axial loads that act in both directions.

Spherical roller bearings have double-row rollers, the outer ring has a common spherical raceway, the inner ring has two raceways and is inclined at an angle relative to the bearing axis. This ingenious structure makes it have self-aligning performance, so it is not easily affected by the angle of the shaft and the bearing box seat on the error or the bending of the shaft. In addition to bearing radial loads, the bearing can also bear axial loads that act in both directions.

Spherical roller bearings have cylindrical and conical internal bores, and tapered cone bores have a taper of 1:30 and 1:12. This tapered inner bore bearing is equipped with an adapter sleeve or a withdrawal sleeve. The conical inner hole self-aligning ball bearing can be easily and quickly assembled on the optical axis or the stepper shaft.

Spherical roller bearing models are: Spherical roller bearings (20000CC); Spherical roller bearings (20000CCK); Spherical roller bearings (20000CC / W33); Spherical roller bearings (20000CCK / W33 type); Spherical roller bearings (20000CCK + H type) mounted on the adapter sleeve; Spherical roller bearings (20000CCK / W33 + H type) mounted on the adapter sleeve. ^[1]

Spherical roller bearings have two rows of rollers, which mainly bear radial loads and can also bear axial loads in either direction. With high radial load capacity, it is especially suitable for working under heavy or vibration loads, but cannot withstand pure axial loads. This type of bearing's outer ring raceway is spherical, so its self-aligning performance is good, and it can compensate for coaxiality errors.

There are two rows of symmetrical spherical rollers, the outer ring has a common spherical raceway, and the inner ring has two inclined to the bearing axis.

Spherical roller bearing pretension is performed at room temperature, but in the working state, the pretension force of the drive shaft generated by the system's micro-tensile temperature rise will change the bearing preload. Therefore, the preload force should be considered To this factor.

It requires capacity, speed, and other conditions to set the pretension force of a properly used spherical roller bearing to ensure transmission life. If the preload is too large, power consumption may even cause overheating. If the preload force is too small, the body load, the shaft rolls, and the gap between the outer rings will cause runout, running, and transmission accuracy to reduce the increase in noise, affect the gear meshing, and severely damage the teeth and bearings.
According to the assembly of different spherical roller bearings, such as: the bearing pre-tightening nut of the inner ring of the inner bearing is compressed directly by the axial rotation, the inner and outer ring to eliminate the gap and achieve the purpose of bearing pre-tightening. Achieve common use: first, far beyond the pre-assembled bearing, the end of the nut, and then back to 1/4 turn. The assembly method, this method has the advantages of less investment, simple, practical, consistent excellent quality on the premise of tapered roller bearings, it can be used.
1. The hot plate heating method can place the bearing on a hot plate with a temperature of 100 ° C for a few minutes. This method is the simplest. If it is turned several times, the bearing can be heated uniformly, and the efficiency is also high. This method can be used.
2.The electric furnace heating method puts the bearings in a closed automatic temperature-controlled electric furnace for heating, uniform heating, accurate temperature control and fast heating, which is suitable for the occasion where a lot of bearings are heated.
3.Induction heating method The induction heater can be used to quickly, reliably and cleanly heat the spherical roller bearing to the required temperature, which is especially suitable for the situation where the inner ring is closely fitted. The ring receives little heat, which makes it easier to fit on the shaft and fit into the seat hole.
4. The electric bulb heating method uses a 50W electric bulb to heat the spherical roller bearing, which can ensure that the heating temperature is about 100 ° C. The smaller bearing can be directly placed on the bulb, and the larger bearing can be placed in the cone of the bulb. The cover can prevent the heat of the bulb from being dissipated, and the heating can be adjusted evenly. The cone cover can be adjusted up and down within a certain range.If a bearing of different sizes is used, the direction of the bulb should be downward to avoid infrared rays being harmful to people. This kind of light bulb can save energy. The heating method of the light bulb is suitable for a small number and is not often needed; in the case of heating the bearing, the light bulb can also be used for lighting at ordinary times, in addition, no other equipment is needed.
5.Oil tank heating method This is a widely used traditional heating method. A metal net is set 50-50 mm from the bottom of the oil tank, and the bearing is placed on the net. Large bearings should be suspended by hooks. It should not be placed directly on the bottom of the tank to prevent contact with the tank. The bearing parts at the bottom are locally heated too much, or the dirt deposited on the bottom of the groove enters the bearing oil tank. The following points should be noted. The mineral oil with good non-corrosive thermal stability should be used. Transformer oil, oil and container should be used. The capacity of the oil tank to be kept clean should depend on the size and oil volume of the heated spherical roller bearing. If the container is too small, the oil temperature will drop quickly as soon as the bearing is placed in continuous operation, and the effect will not be good. ^5]