Double row self-aligning ball bearings, the inner ring has two raceways, the outer ring has a spherical raceway, the center of curvature coincides with the axis of the bearing, and has self-aligning performance. Therefore, when the mechanical bearing is bent under load or the axis of the inner ring is inclined relative to the axis of the outer ring due to machining and installation errors, the normal operation of the mechanical device can still be guaranteed. Double row self-aligning ball bearings are mainly used to bear radial loads, but they can also bear smaller axial loads while mainly bearing radial loads, but cannot bear pure axial loads. Self-aligning double row ball bearings are designed for applications with severe misalignment in mounting or shaft deflection. The concave raceway of the outer ring combined with the two rows of balls allows operation over a wide range of contact angles.

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