What is the purpose of a cage in anti-friction bearings?

The purpose of a cage in anti-friction bearings is to properly space the rolling elements. The cage, often referred to as a separator or retainer, ensures that the rolling elements (like balls or rollers) are evenly spaced within the bearing assembly. This proper spacing is crucial for maintaining consistent and efficient operation of the bearing, as it helps reduce friction and wear while ensuring that the load is evenly distributed across the rolling elements.

Enhancing the performance of the bearing, the cage also plays a role in keeping the rolling elements from coming into contact with each other, which could lead to increased wear and potential failure of the bearing. Additionally, by properly spacing the rolling elements, the cage contributes to a balanced rotation and minimizes vibrations during operation, leading to improved longevity and reliability of the bearing in its application.

While other choices suggest purposes that might seem plausible, such as holding bearings during transport or enhancing aesthetics, they do not align with the primary functional role the cage plays within the mechanics of an anti-friction bearing.