Double gear pump, compared with the single gear oil pump, the double gear pump has two oil suction ports and two oil discharge ports, the rotor rotates once, and the oil is sucked and pressed twice, so the pressure pulsation is small, and it acts on the stator. , The radial force balance between the rotor and the bearing.

Features of double gear oil pump:

The cross-section of the inner teeth before deformation is circular, and the diameter of the outer wall circle is slightly larger than the distance between the inner sides of the two rollers. When the ring gear is installed between the two rollers, the cross-section of the ring gear becomes an ellipse because of the constraints of the rollers. The gear teeth near the two ends of the short axis of the ellipse and the gear teeth of the pinion are in a fully meshed state, while the gear teeth near the two ends of the long axis do not mesh with the pinion; when the drive shaft drives the pinion to rotate, the inner gear rotates accordingly. , the meshing state of the ring gear and the pinion is also constantly changing.

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