"Gear pump displacement method:

The closed area of the displacement gear pair is fitted to the rotation mode of the drive shaft, thereby forming the flow characteristic curve of the left figure (schematic). In a standard hydraulic pump, the pair of gears are engaged once, and they will pulse once on this characteristic curve. After using a double tooth surface structure, the flow pulsation of such a mute pump reduces 75% - correspondingly reduces the flow pulsation on the downstream system element - the new frequency is equal to twice the basic frequency. In this process, the gear pair presents a smaller reducing surface, thereby providing the hydraulic seal not only the front tooth surface of the passive gear, but also the rear tooth surface. In this way, the back tooth is alternately generate fluid flow emissions. Moreover, by adjusting the shape of the metering port, the hydraulic wire can be extended to half of the standard hydraulic pump. "

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