Four-point contact ball bearings as thrust bearings
Published on:
2025-11-07 11:24
Four-point contact ball bearings are radial single-row angular contact ball bearings with specially designed raceways that enable them to withstand axial loads in two directions.
Given a specific axial load, it can withstand a limited radial load. This type of bearing occupies less axial space than a double-row angular contact ball bearing.
The double-half inner ring allows the bearing to hold more steel balls, thus providing a high load capacity. The bearing is separable, meaning that the outer ring, as well as the steel balls and cage assembly, can be installed independently from the double inner ring.
Four-point contact ball bearings are typically used purely as thrust bearings, in conjunction with radial bearings, as shown in the diagram below. When used in this manner, a certain radial clearance remains between the bearing's outer diameter and the bearing housing after the bearing is mounted.
When four-point contact ball bearings are used together with cylindrical roller bearings, the radial internal clearance of the cylindrical roller bearings should be less than the theoretical radial internal clearance of the four-point contact ball bearings after the two types of bearings are installed.
The outer ring of a four-point contact ball bearing must be able to move axially after the shaft thermally expands. Therefore, the outer ring should not be axially clamped; instead, a small gap should be left between the outer ring and the end cover flange. To prevent the outer ring from rotating, a bearing with a locating groove should be used. If the outer ring must be clamped, ensure it is centered within the bearing during installation.
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