On the friction surface of high speed and high load engine operation under, such as gas cylinder and piston ring, the crankshaft journal and bearing, cam shaft and bearings must be lubricated and so on, in order to reduce the frictional resistance, reduce the power loss, reduce the abrasion of parts of the engine, and long-term reliable operation.

Widely used in complex type lubricating system of automobile engine, including pressure and splash lubrication mode of two kinds of. For the friction surface of crankshaft main bearing, connecting rod bearing, camshaft bearing some high speed heavy load, need to be transported to the oil gap to a certain pressure, can ensure the lubrication oil film is formed, the lubrication method called pressure lubrication; while for the bare outside lighter load cylinder wall, the cam of the cam shaft in general, relatively low speed engine piston pin and other parts, is the use of moving parts splashing up oil or oil mist lubrication friction surface, called the splash lubrication. Hydraulic cylinder inside need to add filters to ensure the oil clean.

The purpose of the lubricating system is to the friction surface all moving parts transportation of clean oil, lubrication, cleaning, in order to achieve sealing, cooling, hydraulic, buffer, rust and other functions.