Properties and Uses: rotation when the pinion gear of the gear pump, the suction chamber gear disengaged, the gear teeth of interdental exit, so that the sealed volume increases, the formation of a partial vacuum, the oil in the tank under the action of the external atmospheric pressure, suction line, the suction chamber into the interdental. Gear, inhalation of the interdental the oil is brought to the other side, into the pressure chamber. This is the gear into engagement, so that tightness is gradually reduced, the gear portion of the fluid is extruded, forming a gear oil pressure process. The engagement of the gear tooth contact line suction chamber and the pressure chamber separated from the oil with the role. When the continuously rotating motor driven the active gear pump gear, the gear disengaged side of the sealed volume becomes large, continuously from the tank Suction teeth into engagement side, due to the sealed volume decreases continuously row oil, forming a continuous loop process