Where does the lubrication for strut bearings typically come from?

Strut bearings are primarily designed to support and allow for the movement of various components in marine applications. The lubrication for strut bearings commonly comes from seawater. This approach is typically employed because seawater can effectively lubricate the bearings due to its abundant availability in a marine environment.

Seawater lubrication serves to reduce friction and wear as the bearing operates, while also preventing overheating, which is crucial in maintaining the reliability and longevity of the strut bearings. Various designs and materials of strut bearings are implemented to ensure they resist corrosion from the seawater, which can be a factor in their effective operation.

The other options, while relevant to different types of systems, do not apply directly to the typical lubrication source for strut bearings. Internal oil reservoirs might be used in other applications where oil lubrication is necessary for moving parts, air cooling systems are designed for temperature management rather than lubrication, and hydraulic systems operate distinctly with fluid power but do not usually provide lubrication for strut bearings in a marine context.