In a tapered roller bearing, what does the term "cup" refer to?

In a tapered roller bearing, the term "cup" specifically refers to the outer race of the bearing. The outer race is a crucial component that houses the tapered rollers and provides a surface for them to rotate against. It significantly contributes to the overall structure and function of the bearing, as it helps maintain the alignment and stability of the rollers, allowing them to handle both radial and axial loads effectively.

The design of the cup includes a tapered profile that matches the shape of the rollers, ensuring proper contact and load distribution, which is vital for reducing wear and prolonging the lifespan of the bearing. Understanding the function of the cup, along with its interaction with the inner race and the rollers, is essential for appropriate selection, installation, and maintenance of tapered roller bearings. The other options do not accurately describe the function or structure of a tapered roller bearing.