The crossed roller bearing is a special type of bearing with a divided inner ring and a rotating outer ring. It has the characteristics of high rigidity and high-precision rotation. They are commonly used as spherical bearings in industrial robots for applications requiring high rotational accuracy and stability.
There are obvious differences in structure and usage characteristics between crossed roller bearings and tapered roller bearings.
The rollers of crossed roller bearings are arranged vertically. This design enables the bearing to simultaneously bear loads in all directions, such as radial load, axial load and moment load, and has the characteristics of high rigidity and high-precision rotation. They are commonly used as spherical bearings in industrial robots.
The contact point between the rollers and the raceway of the tapered roller bearing is line contact, which can withstand the combined effects of radial load, axial load and overturning moment at the same time. This type of bearing is generally only used to bear radial load and one-way axial load. If it bears two-way axial load, a spacer ring or bushing must be installed between the inner and outer rings of the bearing.
The accuracy grades of crossed roller bearings are mainly divided into five grades: P0, P6, P5, P4 and P2. Among them, PO level is a national standard and the most common standard in the bearing industry, so it is also called general accuracy and is mainly used for some ordinary machine tool spindles. P2 level is high-level precision. The bearing dimensional accuracy and rotation accuracy are higher than PO. It is mainly used for mid-to-high-end CNC machine tools.
