OILPUMP
Oil pump
The oil pump in an internal combustion engine circulates engine oil under pressure to the rotating bearings, the sliding pistons and the camshaft of the engine. This lubricates the bearings, allows the use of higher-capacity fluid bearings and also assists in cooling the engine.The above text is a snippet from Wikipedia: Oil pump (internal combustion engine)
and as such is available under the Creative Commons Attribution/Share-Alike License.