AN INVESTIGATION OF THE IMPACT OF PUMP DEFORMATIONS ON CIRCUMFERENTIAL GAP HEIGHT AS A FACTOR INFLUENCING VOLUMETRIC EFFICIENCY OF EXTERNAL GEAR PUMPS

Gear pumps are widely used in transport machines not only hydraulic drive systems, but also lubrication and fuel systems. A positive displacement pump converts mechanical energy into pressure stored the liquid, which it transports to cylinder or motor. The efficiency of this process depends on system components, including pump, amount internal leakage through gaps between high low sides. larger gaps, lower volumetric efficiency. This article presents an investigations impact deformations circumferential gap height. a three-dimensional model external gear using Finite Element Method (FEM) during operating conditions. reflects pumping operation at discharge pressures up 32 MPa was validated against strain measurements casing. simulation results indicate that casing becomes deformed due pressure, causing significant increase height gap. from 8 causes more than twofold local obtained for correct modelling flow generated by pumps, is necessary consider change size resulting deformation pump.