A bearing in a gearbox, subject to splash lubrication is:

A bearing in a gearbox that is subjected to splash lubrication is typically classified as an open bearing. Open bearings are designed without additional seals or shields, allowing oil to flow freely from the oil sump or reservoir into the bearing itself. This design is particularly advantageous in splash lubrication systems because it facilitates the easy access of lubricant, ensuring that the bearing is effectively lubricated as the oil splashes around within the gearbox.

The openness of the bearing allows for effective dispersion of lubrication, which helps reduce friction and wear between moving parts. With a properly designed splash lubrication system, open bearings can maintain adequate lubrication, enhance performance, and prolong the life of the bearing, making them suitable for the operating conditions within gearboxes where splash lubrication is employed.

Other types of bearings, such as sealed or shielded, are designed to contain lubricant or prevent contaminants from entering, which might limit the flow of lubricant needed in a splash lubrication scenario. Adjustable bearings refer to those that can be altered for fit or clearance but do not specifically pertain to the lubrication method used. Therefore, understanding the context of lubrication and bearing design clarifies why open bearings are the preferred choice in this instance.