Self-aligning roller bearing has two rows of rollers, which mainly bear radial load and can also bear axial load in any direction. It has high radial load capacity, especially suitable for working under heavy load or vibration load, but it cannot bear pure axial load. The raceway of the outer ring of this type of bearing is spherical, so its centering performance is good and can compensate for the coaxiality error.

There are two rows of symmetrical spherical rollers, the outer ring has a common spherical raceway, and the inner ring has two raceways inclined at an angle with the bearing axis, which have good centering performance. When the shaft is bent or installed concentrically, the bearing can still be used normally. The centering property varies with the bearing size series. Generally, the allowable centering angle is 1~2.5 degrees. This type of bearing has a large load capacity, In addition to bearing the radial load, the bearing can also bear the axial load of two-way action and has good impact resistance. Generally speaking, the allowable working speed of self-aligning roller bearing is low.

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