Spherical roller bearings are principally provided with two rows of symmetrical spherical rollers and a common sphere raceway in outer ring, the two inner ring raceways are included at an angle to the bearing axis. The bearings have good self-aligning ability and can operate when the shaft deflection under load or the shaft deflection under load or the shaft misaligning in mounting, and their permissible aligning angle is 1 to 2.5 degree. This kind of bearing has heavy load carrying capacity and anti-impact ability, in addition to carrying radial loads, they also can carry axial loads in two directions. In general, this type of bearing permit a low limiting speed.
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