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Self-aligning Ball Bearing

Self-aligning ball bearings have two structures: cylindrical bore and tapered bore. The cage is made of steel plate, synthetic resin, etc. Its characteristics are that the outer ring raceway is spherical, with automatic self-alignment, which can compensate for the errors caused by non-concentricity and shaft deflection, but the relative inclination of the inner and outer rings shall not exceed 3 degrees.

Self-aligning ball bearings are bearings with spherical balls installed between the inner ring with two raceways and the outer ring with a spherical raceway.

Design and variation

Product details

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Model number Basic size Basic load rating Rated speed
Dynamic state Static Reference speed Limiting speed
d [mm] D [mm] B [mm] C [kN] C₀ [kN] [r/min] [r/min]
1300
 10 35 11 7.35 1.62
135
 5 19 6 2.53 0.475
11228M
 140 250 50
1224K
 120 215 40 119.5 52.5
11224T
 120 215 40
1222K
 110 200 38 80.2 35.2
1222
 110 200 38 80.2 35.2
1221M
 105 190 36
1220K
 100 180 34 69 29.7
1220
 100 180 34 69 29.7
1219K
 95 170 32 57 24.3
1219
 95 170 32 57 24.3
Model number Basic size Basic load rating Rated speed
Dynamic state Static Reference speed Limiting speed
d [in] D [in] B [in] C [Ibf] C₀ [Ibf] [r/min] [r/min]
1300
135
11228M
1224K
11224T
1222K
1222
1221M
1220K
1220
1219K
1219

Advantage

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The main features of self-aligning ball bearings include self-aligning, low friction, load capacity, speed limit, noise and vibration. ‌‌


1. Self-aligning

The outer ring raceway surface of the self-aligning ball bearing is spherical, with the center of curvature consistent with the center of the bearing, and has self-aligning ability. This design allows the bearing to automatically adjust when the shaft or housing is deflected, ensuring good contact between the raceway and the rolling element. This self-aligning function is particularly suitable for occasions with shaft deflection or large installation errors.


2. Low friction and temperature rise

Compared with any other type of rolling bearing, the self-aligning ball bearing generates the lowest friction and low temperature rise even at high speeds. The clearance fit between the rolling element and the outer ring reduces friction and friction heat, thereby extending the service life of the bearing and maintenance intervals.


3. Load capacity

The self-aligning ball bearing mainly bears radial loads, and can also bear a small amount of axial loads. Due to the large contact area between the rolling element and the raceway, the self-aligning ball bearing has a high load capacity and good rigidity.


4. Limiting speed

Compared with deep groove ball bearings, the limiting speed of self-aligning ball bearings is lower, which is suitable for medium and low speed operation.


5. Noise and vibration

Due to the automatic self-aligning function, the self-aligning ball bearings generate less noise and vibration during operation, which is suitable for low noise and low vibration.



Application

Self-aligning ball bearings are widely used in occasions where errors caused by different concentricity and shaft deflection need to be compensated, such as papermaking machinery, semiconductor equipment, gear devices, etc. In the mesh, pressing and drying parts of papermaking machines, the shaft often bends, and the self-aligning ball bearings can automatically adjust to ensure the normal operation of the equipment.