The high-pressure oil pump is the interface between the high-pressure oil circuit and the low-pressure oil circuit. Its function is to generate fuel pressure in the common rail pipe by controlling the fuel output. Under all working conditions, it is mainly responsible for providing sufficient high-pressure fuel to the common rail.

Classification of high pressure oil pump:

Fuel injection pump can be divided into unit pump and component pump (all pumps) according to its overall structure.

Monomer pump is mainly composed of a plunger and plunger sleeve. It does not have a camshaft, and some even do not have roller transmission parts. Because the unit pump is easy to be placed near the cylinder head, the high-pressure oil pipe is greatly shortened. At present, it is applied to high-power medium and low-speed diesel engines with cylinder diameter of more than 200mm.

The composition of the pump is to install a plunger couple with the same number of cylinders in the same pump body. Each cylinder has a group of fuel injection elements, which are driven by the corresponding cams of the camshaft in the pump body.