4.9.2 Oil pump
The name of this device indicates its purpose. An oil pump is required for pumping engine oil from the oil sump, which is located at the very bottom of the engine, to all rubbing parts through special oil channels.
Gear-type pumps with external or internal gearing are used for this purpose. Pumps of the first type are now very rarely installed on passenger cars due to their size, therefore, we will consider the type of pump, which is the most relevant today – gear-type pump with internal gearing, an example of which can be seen in Figure 4.39.
Figure 4.39 Gear-type oil pump with internal gearing.
The oil pump is usually driven from the crankshaft by a chain, belt or gear, depending on the type of timing mechanism, or directly mounted on the crankshaft The work of the pump lies in the fact that when rotating, the small gear rolls over the large gear, carrying the engine oil along with it. Through the channels the pump under pressure transfers oil to the rubbing parts.
2 MB