Tailoring the Bore Surfaces of Water Hydraulic Axial Piston Machines to Piston Tilt and Deformation

Meike Ernst, Andrea Vacca, Monika Ivantysynova and Georg Enevoldsen
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Meike Ernst: School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA
Andrea Vacca: School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA
Monika Ivantysynova: School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA
Georg Enevoldsen: Danfoss High Pressure Pumps, DK-6430 Nordborg, Denmark

Energies, 2020, vol. 13, issue 22, 1-31

Abstract: A novel virtual prototyping algorithm has been developed to design one of the most critical lubricating interfaces in axial piston machines of the swash plate type—the piston–cylinder interface—for operation with water as the working fluid. Due to its low viscosity, the use of water as a lubricant can cause solid friction and wear in these machines at challenging operating conditions. The prototyping algorithm compensates for this by tailoring the shape of the bore surface that guides the motion of each piston in this type of positive displacement machine to conform with the piston surface, taking into account both the piston’s tilt and its deformation. Shaping these surfaces in this manner can render the interface more conducive to generating hydrodynamic pressure buildup that raises its load-carrying capacity. The present work first outlines the structure of the proposed algorithm, then presents a case study in which it is employed to design a bore surface shape for use with two prototypes, one virtual and one physical—both modified versions of a 444 cc commercial axial piston pump. Experimental testing of the physical prototype shows it to achieve a significantly higher maximum total efficiency than the stock unit.

Keywords: water hydraulics; axial piston pump; surface shaping (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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