What are the common lubrication methods for engines?

[JulianaFitz]

There are three common lubrication methods for engines: pressure lubrication, splash lubrication, and gravity lubrication. Pressure lubrication: Uses an oil pump to deliver lubricating oil under pressure to the friction surfaces of components, forming an oil film of sufficient thickness to withstand mechanical loads, ensuring reliable lubrication. This method primarily serves components with high relative speeds and significant mechanical loads in the engine. Splash lubrication: Utilizes oil droplets splashed by rotating components such as the crankshaft and camshaft during engine operation or sprayed from oil holes in the connecting rod big end to lubricate friction surfaces. This method is used for components like cylinder walls, cams, and piston pins. Periodic lubrication: Involves the regular application of grease for lubrication, primarily targeting components such as the generator, starter motor, and water pump bearings.