What is the function of the outer casing on sealed components like engines and transmissions?

The outer casing on sealed components such as engines and transmissions serves a crucial role in maintaining the integrity and efficiency of these systems. Primarily, its function is to keep lubricating fluids contained within the engine or transmission, preventing leaks that could lead to insufficient lubrication. At the same time, it acts as a barrier against dirt, dust, and other contaminants that could infiltrate the system. This sealing is essential for the longevity and performance of the engine or transmission, as proper lubrication minimizes wear and tear, ensuring smooth operation and reducing the risk of damage. The design of the outer casing contributes to maintaining optimal performance by safeguarding these vital fluids, thus playing a significant role in the overall functionality and reliability of heavy equipment.