The role of the oil pump is to raise the oil to a certain pressure, forced pressure to the engine parts of the moving surface. Its structure and use of gear oil pump. Engine work, the crankshaft drive gear drive, driven gear for the opposite direction of rotation. The oil in the oil suction chamber is pressed into the oil chamber along the backlash and the pump wall. Because the oil in the oil chamber is continuously taken away, the suction in the oil chamber generates suction, constantly sucking the oil in the oil pan into the oil absorption chamber, and at the same time pumps the oil with certain pressure into the lubricating oil path.