The difference between Spherical roller bearing and self-aligning ball bearing:
The shape of the rolling body is different: the rolling body of the self-aligning roller bearing is the roller, and the rolling body of the self-aligning ball bearing is the ball.
Different bearing capacity: aligning ball bearings mainly bear radial load, while bearing radial load, they can also bear a small amount of axial load.But generally can not bear pure axial load, rated load ratio is 0.6~0.9. Aligning roller bearings mainly bear radial load. But also can bear a certain axial load, rated load ratio of 1.8~4.0.
Different use environment: the bearing capacity of self-aligning roller bearing is greater than that of self-aligning ball bearing, suitable for low speed and heavy load conditions. Aligning ball bearings are suitable for high speed and light load conditions.
Spherical roller bearing are double row non-separable bearings. The structure includes a solid outer ring with a spherical raceway, a solid inner ring and a drum roller with a cage. The inner ring has a cylindrical hole or a cone hole. The symmetrical drum roller can be adjusted freely in the outer spherical raceway. Therefore, the bending of the shaft and the misalignment of the matching surface can be compensated.
Self-aligning ball bearing is a double row ball bearing with outer ring raceway machined into spherical shape and inner ring with two deep groove raceway. With aligning performance. It belongs to non-separable bearing. Mainly used to bear radial load. While under radial load. It can also bear a small amount of axial load. But generally can not bear pure axial load, its limit speed is lower than deep groove ball bearing.
Selection considerations of Spherical roller bearing and self-aligning ball bearing
Allowable space: that is, the appearance parameter of the bearing is allowed to be installed.
Load size and direction: both radial and axial combined load, at the same time, there is also a large deformation of the shaft or shell and the installation of neutral difference. Self-aligning ball bearing or self-aligning roller bearing can be selected.
Bearing working speed: aligning roller bearing is suitable for heavy duty medium speed. Aligning ball bearings are suitable for light load and high speed.
Rotating accuracy: G grade precision bearings are generally used.
Bearing rigidity: general roller bearing rigidity is greater than ball bearing. The rigidity of bearings can be improved by pretightening.
Friction torque: Generally speaking, bearing low friction torque, should try to use aligning ball bearings.
Installation and disassembly: when disassembly is frequent, Spherical roller bearing and self-aligning ball bearing with tapered inner rings with tight or unwinding sleeves can be selected.