Parker gear pump common failure

Parker gear pump has the advantages of simple and compact structure, small volume, light weight, good technology, cheap price, strong self-suction, insensitive to oil pollution, large speed range, impact resistance load, easy maintenance, reliable work and so on. However, once there is a failure, there is no way to take this, now we have made several analysis for the customer feedback of the problem items, hope to help you, but also our responsibility.

1. Trapped oil phenomenon

Hydraulic oil in the process of running involute gear pump, because the closed volume at the intersection of the gear changes with time, often a part of the hydraulic oil is sealed between the teeth, known as trapped oil phenomenon, because the hydraulic oil is incompressible will make the external gear produce great vibration and noise, affecting the normal work of the system

2. Leakage phenomenon

The leakage of gear pump is large. When the external meshing gear is running, the leakage path has the following three points: one is the gear top gap, the second is the measurement gap, and the third is the meshing gap. The end-face clearance leakage is large, accounting for 80%-85% of the total leakage. When the pressure increases, the former will not change, but the deflection of the latter increases, which is the main reason for the leakage of external gear pump. The volume efficiency is low, so it is not suitable for high pressure pump.

3. Unbalanced force phenomenon

The right side is the oil pressure chamber, the left side is the oil suction chamber, the pressure of the two chambers is unbalanced; In addition, the pressure of the oil chamber decreases due to the leakage of the tooth top. Two unbalanced pressure acting on the gear and shaft a radial unbalanced pressure, the higher the oil pressure, the greater the force, accelerate bearing wear, reduce bearing life, make the shaft bending, increase the tooth top and shaft hole wear.