Self aligning ball bearing is a two groove of the inner ring and the outer ring raceways between spherical, a spherical ball bearing assembly. The outer ring raceway surface curvature center and bearing center line, so with automatic self-aligning ball bearing the same tune of heart function. Deflection appeared on the shaft, the outer shell, can be automatically adjusted, not to increase the burden bearing. The axial load of spherical roller bearings can bear radial load and two direction. Radial load capacity, suitable for heavy load, impact load conditions. Inner diameter is tapered bore bearings can be installed directly. Or use the sleeve, remove tube installed in the cylinder axis. The holder to use steel stamping cage, polyamide forming cage and copper alloy machined cage.