Modelling and Simulating Hydraulically Balanced External Gear Pumps

The paper presents some developments of a research activity regarding hydraulically balanced external gear pumps.Numerical models are introduced in order to study gears radial equilibrium and axial bearing blocks balance. A numericalapproach useful for determining the eccentric positions assumed by gears inside the pump casing and to assess the radialthrusts acting on gears is proposed. The effect of the running in process on the casing internal surface and on the pressure distribution in sealed spaces between teeth is also shown and discussed. At the end a numerical model useful in designing bearing blocks balancing surfaces is outlined. Comparisons of numerical and experimental results seem to encourage the development of the study.