Spherical roller bearings perform poorly because most of the time, only a row of rollers is under stress. This situation is more likely to occur in large diameter spherical roller bearings because the internal clearance of large diameter spherical roller bearings can be translated into a relatively large axial clearance within the ball. Under external force, the inner ring will shift from left to right relative to the outer ring until the right row of rollers contacts the outer race. In this case, the play of the double row spherical roller bearing acts on the left row of rollers, so that the left roller and the outer race are disengaged and are not carried for most of the time.
A column of rollers that are not hosted can cause a lot of problems, including:
1. The bearing capacity of spherical roller bearings is reduced and the life of the sample is reduced.
2. Since the single-row load will cause the axial load of the system, the roller end face and the rib may contact, which will bring more heat, which will be more complicated for lubrication, shaft hole fit and life.
3. A row of rollers that are not carried are always pushed by the cage, and there is almost no rolling, which causes slippage and the corresponding problems previously mentioned.
4. A false indentation occurs under static load conditions.
Raceway stress
The magnitude of the stress is related to the size of the load-bearing zone. It is very important that the system has a better load-bearing zone. When the load is received by many rollers and two rows of rollers, the stress value will be smaller.
Under the equivalent load condition, the stress of the double row tapered roller bearing is better in all cases, and the stress of the spherical roller bearing is larger than that of the tapered roller bearing. For a series of spherical rollers close to the rotor, there is almost no stress under some operating conditions because this column is not loaded.
in conclusion
The fan spindle bearing arrangement consists of a fixed end and a floating end. The double row tapered roller bearing plus cylindrical roller bearing solution has great advantages compared to the two spherical roller bearing solutions because:
1. Double row tapered roller bearings provide very good radial and axial load carrying capacity.
2. Pre-tightened double row tapered roller bearings improve the load-bearing area to better distribute the load and increase sample life.
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