How can the installation accuracy of crossed roller bearings be improved? Specific operational methods.

The installation accuracy and fitting accuracy of crossed roller bearings directly affect the performance and service life of these bearings. Many precision instruments employ crossed roller bearings that have extremely high precision requirements. In such cases, it is crucial for us to pay close attention to ensuring both the installation accuracy and fitting accuracy of the bearings. Below, a manufacturer of crossed roller bearings will share some tips on how to improve the installation accuracy and fitting accuracy of these bearings.

1. Ensure correct installation.

Only proper installation can fully harness the advantages of a bearing. This principle has been recognized and given great importance by many users in practice. To improve installation accuracy, you actually only need two tools: first, measurement methods and tools that must avoid deforming the bearing; second, these two are the essential foundation. Only when these two conditions are met can you ensure that subsequent operations are carried out correctly.

On the outer circumference and inner bore of the cross roller bearing, as well as on the corresponding surfaces of the shaft and housing bore, two sets of markings indicating the direction of the maximum deviation should be made on either side near the assembly chamfer. This ensures that, during actual assembly, the maximum deviations of the mating parts are aligned in the same orientation, thereby partially offsetting the deviations after assembly. The purpose of providing these two sets of directional markings is to enable comprehensive consideration of deviation compensation, which not only improves the rotational accuracy of each bearing end but also partially eliminates the coaxiality errors between the housing bores and the journal diameters at both ends of the bearing. Implementing surface enhancement treatments on the mating surfaces—such as sandblasting or inserting a precision plug slightly larger in diameter into the inner bore once—can also help improve the mating accuracy.

II. Conduct accurate measurements

The importance of measurement cannot be overstated. If the measuring instruments are faulty or inaccurate, all subsequent work will be in vain. During installation, the clarity of the drawings and the technical expertise of the personnel both significantly influence the equipment’s future service life.

To improve the actual fitting accuracy when installing cross roller bearings, it is essential to employ measurement methods and tools that do not cause deformation of the bearing. This involves conducting precise, on-site measurements of the mating surfaces—the inner bore and outer diameter—of the bearing. All relevant measurements of both the inner and outer diameters can be taken, and the collected data should be thoroughly analyzed. Based on these analyses, the dimensions of the shaft and housing bore at the bearing installation locations can be precisely matched. During the actual measurement of the corresponding dimensions and geometric features of the shaft and housing bore to be fitted, the measurements should be carried out under the same temperature conditions as those used when measuring the bearing itself. To ensure a high-quality actual fit, the surfaces of the shaft and housing bore that are to be paired with the cross roller bearing should have the lowest possible surface roughness.

Based on the nature of the bearing load and the differing rotational conditions of the inner and outer rings, accurate planning is essential. It’s important to recognize that each ring experiences different types of loads—static loads, rotating loads, and fluctuating loads. The material used for the bearing should vary depending on the magnitude of the load. If high-speed rotation is required, it’s imperative to use high-precision bearings and simultaneously enhance the dimensional accuracy of both the bearing housing and the shaft, while being vigilant about excessive interference fits.

The above is a guide on how to improve the installation accuracy of crossed roller bearings. We hope it will be helpful to everyone. In addition, Aowei Bearing manufactures crossed roller bearings and turntable bearings in various specifications. If you have any needs, please feel free to call us for more information.