Gear oil pump according to the structure of the pump shell is divided into two pieces and three pieces. Two chip due to the processing and the axis of the more difficult, so use few, according to the structure of the gear, a set of teeth and helical teeth and herringbone gear, helical teeth and herringbone gear, due to the manufacturing process is relatively complex, in addition to the large displacement and requirement in the row of even and low noise of occasions to use, generally adopts spur gear is, helical gear pump can produce axial thrust, in the process of turning Herringbone gear can be seen as two opposite direction of the helical gear combinations, and therefore in the process of transmission of axial thrust balance each other, according to the number of gear, two, three gear oil pump, gear pump (see figure 1-1), multiple and double gear oil pump, gear pump (see figure 1-2) and triple gear oil pump (see FIG. 1-3) 1 according to the working pressure, Can be divided into low pressure, medium pressure and high pressure gear oil pump; According to the seal of the input shaft end, there are mechanical seal and packing seal. Packing seal structure is simple, reliable, low cost, but resistance and wear, and often maintenance, packing seal in high temperature oil pump applications; Mechanical seal on the contrary, the structure is more complex, more parts, high cost, the advantage is good sealing performance, small friction, high mechanical efficiency, and do not often maintain. So the pump with large displacement is more mechanical seal, and the small pump is more packing seal.
图1-3
