The design is the inner and outer rings of the track and roller into a truncated cone and the conical apex concentrated in a point on the axis. The rollers roll along the inner edge of the inner ring. Single row tapered roller bearings can be radial load and axial load of the synthetic load. However, to bear the pure radial load or axial load in both directions, two opposite bearings, complex or four-row tapered roller bearings must be used. As the outer rings and the inner rings with the roller can be separated, so the assembly is easy, the gap is also easy to adjust and it is also applied to be pre-pressured re-used.