The bearings in the ring and rollers off-piste between the two raceways are spherical roller, in the internal structure is different because the outer ring rolled the paper and the center together, have the heart, it can automatically adjust for flexible axle or shell or a different from a heart can axis not withstanding the radial direction load and two-way axial load applicable to carry heavy loads. the impact loads. Conical bore the fastener or by using the set by the shafts to remove.