Bearings’ Marking

The “V-shaped” symbol on the outer ring of matched bearing sets serves as an installation guide. This marking helps to establish the correct preload within the bearing set, optimizing its performance. Additionally, the “V-shaped” symbol should align with the direction of the axial load acting(fig.2) on the inner ring. In scenarios where axial loads come from both directions, the marking should point towards the heavier load to ensure optimal bearing function.

The marking of maximum eccentricity on the inner and outer diameters of angular contact ball bearings serves a critical role in achieving optimal rotational accuracy in a shaft system. These precision bearings are usually installed and operated in sets within the shaft system, aiming for the best possible rotational accuracy, particularly in terms of radial runout of the inner and outer rings. The quality of rotational accuracy primarily depends on the extent of this radial runout, which is a combination of eccentricity and the roundness of the raceway.

For systems that use multiple sets of bearings, aligning these high points of radial runout at a single angular position during installation can effectively eliminate the influence of eccentricity on the shaft’s rotational accuracy. This leads to achieving the best possible rotational accuracy. That’s why it’s essential to mark these high points on the inner and outer rings of precision angular contact ball bearings. During the assembly process, aligning these high points along a straight line can significantly improve the rotational accuracy of the system.