The gear oil pump has a simple and compact structure, easy to manufacture, easy to maintain, and has self-priming ability, but the flow and pressure pulsation are large and the noise is big. The gear pump must be equipped with a safety valve to prevent damage to the pump or the prime mover for some reason, such as the outlet pressure of the exhaust pipe that causes the pump's outlet pressure to exceed the allowable value. When a pair of meshing tooth entered, another pair of teeth not out of engagement, this also makes the two pairs of teeth is formed between a closed interval, the interval is not high pressure oil is not communicated with the suction area of low pressure area, when the gear continues to rotate, the meshing between the high pressure zone the tooth pressure increases rapidly, the formation of ultra high pressure, when the team turned the middle point of the tooth, the tooth between the space increases, the formation of suction phenomenon, the emergence of a large number of pockets in the booster, the gear meshing resistance to surge, floating on the side plate sliding bearing great pressure, cavitation and noise in the low pressure zone and the formation of large. In order to ensure that the gear oil pump is stable, the gear recoincidence of the gear pump is greater than one.

This phenomenon is called gear pump oil trapping solution is usually open unloading groove in the floating plate, unloading slot method is slotted in high pressure contact area, the formation of high pressure oil meshing inflow pressure oil, also is the pressure oil outlet, vacuum zone and oil formation and low pressure area makes the recess slot when the opening is communicated, so it solves the problem of trapped oil phenomenon.

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