Gear oil pump flow pulsation is related to the following factors
Gear oil pumps that are prone to flow pulsation include: KCB gear oil pumps, 2CY gear oil pumps, YCB gear oil pumps, arc gear oil pumps and stainless steel low-pressure gear oil pumps. 1. The number of gear teeth is small and the pulsation rate is large.When the number of teeth Z = 8, the flow unevenness coefficient δ = about 25%; when the number of teeth Z = 14, the flow unevenness coefficient δ = 15%. 2. Overlap coefficient The overlap coefficient is large and the pulsation rate is large. 3. The unloading tank does not open the unloading tank, and the pulsation rate is the largest.Low-pressure gear oil pump unloading groove structure has different pulsation rate 4. Increasing the engagement angle α can reduce the pulsation rate of the low-pressure gear oil pump . 5. Tooth oblique angle β adopts helical gears, and the rotation is relatively stable. The overlap coefficient can be made smaller to reduce the pulsation rate. Because the compressibility of the liquid is very small, when the size of the trapped oil volume changes, the flow rate changes and the pressure also changes.With the flow pulsation, pressure pulsation is caused, which in turn causes the system pipes and valves to generate vibration and noise.Resonance also occurs when the pressure pulsation frequency of the low-pressure gear oil pump is close to the natural frequency of the system pipes and valves.In order to reduce pressure pulsation and avoid resonance, Z and n should be made as large as possible to make the fQ value larger, and measures should be taken against other factors that affect flow pulsation.