The self-aligning ball bearing is a rolling bearing with automatic self-aligning capability. It has a double-row ball and spherical outer ring raceway structure, which can effectively compensate for the non-concentricity caused by installation error or shaft deflection. It has stable operation, low friction coefficient and long life, and is particularly suitable for occasions with shaft deflection or low installation accuracy. This type of bearing is divided into cylindrical hole type and conical hole type according to the inner hole form, and the cage is commonly made of steel plate or synthetic resin.Self-aligning ball bearings are constructed with double-row balls. The biggest advantage of this type of bearing is that it has a self-aligning function. Self-aligning ball bearings are designed to withstand radial loads and a small amount of axial load. They are widely used in equipment that needs to withstand large radial loads, such as industrial machinery, agricultural machinery, transportation equipment, etc. Self-aligning ball bearings can operate normally even if they are not fully aligned during installation or the working environment changes.
The self-aligning ball bearing consists of two inner ring raceways, double-row steel balls and an outer ring spherical raceway. Since the outer ring raceway is spherical and its center of curvature is consistent with the center of the bearing, the bearing has an automatic self-aligning function. Even if the shaft or housing is slightly deflected, the bearing assembly can automatically adjust its posture to maintain normal operation. It is suitable for occasions with problems such as shaft deflection and installation errors to ensure rotation stability. Some self-aligning ball bearings also provide structures with seals or dust covers, and are pre-filled with grease inside, which can be used maintenance-free and have an adaptable temperature range of -30°C to +120°C.
can effectively compensate for the non-concentricity error caused by shaft deflection or installation deviation to ensure smooth operation.
（2）Reasonable structure, low friction and low noise:
adopts double-row ball structure, stable operation, suitable for low noise and high speed requirements.
（3）Moderate load capacity:
mainly bear radial load, and can also bear small to medium axial load.
（4）Optional different structures and materials:
cylindrical hole and tapered hole are available; the cage can be steel plate or engineering plastic (resin).
（5）Some models are maintenance-free:
bearings with sealing structure are pre-filled with grease, which can be used stably in a wide temperature range without frequent maintenance.
（6）Limited allowable tilt angle:
the maximum relative tilt of the inner and outer rings does not exceed 3°, exceeding this angle will affect the life and performance.
Self-aligning bearings are widely used in industrial applications where shaft deviation compensation is required due to their self-alignment and high load-bearing capacity. The main applications are as follows:
(1) Heavy machinery: For example, mining machinery, metallurgical machinery, construction machinery, etc., self-aligning bearings can operate smoothly under harsh conditions.
(2) Textile and papermaking industry: The shafts of textile and papermaking machinery may be slightly misaligned or bent during operation. Self-aligning bearings can automatically compensate for these irregularities, ensuring smooth operation of the equipment and improving production efficiency.
(3) Agricultural equipment: Since agricultural equipment works in complex outdoor environments, the use of self-aligning bearings can extend the service life of the equipment.
(4) Conveying equipment: Material conveyor shafts, belt conveyors and other equipment may be misaligned after long-term use. The use of self-aligning bearings can reduce friction and extend the service life of the equipment.
(5) Ship and railway industry: Since the mechanical parts of trains and ships must withstand complex working conditions and vibrations, self-aligning bearings are used in axles, transmissions and other key components to maintain consistent performance.
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