A brief introduction to the oil pump

The oil pump is a light and compact pump, which has three categories: in-line, distributed and single-body. The oil pump needs a power source to operate, and the camshaft at its lower part is driven by the engine crankshaft gear.
The oil pump proposes an oil pump having a housing made of aluminum-containing material and a movable molded part arranged in the housing, wherein the movable molded part is at least partially made of a sinterable iron-based alloy material containing at least one austenite, and wherein the molded part made of a sinterable material has a thermal expansion coefficient of at least 60% of the thermal expansion coefficient of the housing.
The key part of the fuel injection pump is the plunger. If the common syringe in the hospital is used as an analogy, then the movable plug is called the plunger, and the syringe is called the plunger sleeve. Assuming that a spring is installed in the syringe to support one end of the plunger, and the other end of the plunger contacts the camshaft, when the camshaft rotates one circle, the plunger will move up and down once in the plunger sleeve. This is the basic movement mode of the plunger of the fuel injection pump.
The plunger and the plunger sleeve are very precisely processed matching parts. There is an inclined groove on the plunger, and a small hole on the plunger sleeve is called the suction port. This suction port is filled with diesel. When the plunger inclined groove faces the suction port, the diesel enters the plunger sleeve. When the plunger is pushed to a certain height by the camshaft, the plunger inclined groove is staggered with the suction port, and the suction port is closed, so that the diesel can neither be sucked in nor pressed out. When the plunger continues to rise, it presses the diesel. When the diesel pressure reaches a certain level, it will push open the one-way valve and rush out into the fuel injection nozzle, and then enter the cylinder combustion chamber from the fuel injection nozzle. Each time the plunger discharges a certain amount of diesel, only a part of it is sprayed into the cylinder, and the rest is leaked from the return oil hole, and the injection amount is adjusted by increasing or decreasing the amount of return oil leaked. When the plunger rises to the "upper point" and moves downward, the plunger inclined groove will meet the suction port again, and the diesel is sucked into the plunger sleeve again, repeating the above action again. Each group of plunger systems of the in-line fuel injection pump corresponds to one cylinder, and there are 4 groups of plunger systems for 4 cylinders, so the volume is relatively large, and it is mostly used in medium-sized and larger vehicles. For example, diesel engines on buses and trucks generally use in-line injection pumps.