Modeling of external gear pumps for high pressure fluid power application

The external gear pumps are devices used in a wide range of applications that go from the industrial field where, for example, they can be used to transfer the fluid along a productive process system, or in mobile applications and off-road vehicles. They are valuable for their simplicity, robustness, the possibility of working with a wide range of fluid viscosity and the low cost. Such a widespread usage underlines the advantage that a deeper control in the design process would lead. The deeper control just mentioned, is brought through the model presented in this thesis. More precisely, in this thesis is first described HYGESim, an external gear pump lumped parameter model developed by the MAHA Fluid Power Research Center. Additionally, are described the phases that characterize the design of the fluid-dynamic aspect of an external gear pump, giving also an insight of the phenomena that characterize this kind of devices. Moreover, are presented other not closely fluid-dynamic linked but still essential aspects faced during the design phase of an external gear pump and improving of the model. One of these aspects is the developing of a graphic user interface that extend the capability of using the model to every user. The other is the design of the pump in a 3D CAD ambient focusing on one of this specific project requirement: the integration of the hydraulic machine inside the electric machine that activate it.