1,722,035 research outputs found
Die Entwicklung und Untersuchung von biologisch schnell abbaubaren Druckübertragungsmedien auf Basis von synthetischen Estern
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Simulationsgestützter Entwurf elektromagnetischer Linearaktoren für fluidtechnische Ventile
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Dreidimensionale Strömungsberechnungen zur Optimierung von Hydraulikventilen bezüglich der stationären Strömungskräfte
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PVD-Schichten in Verdrängereinheiten zur Verschleiß- und Reibungsminimierung bei Betrieb mit synthetischen Estern
No full textHydrostatic pumps and motors are essential components of hydraulic systems. They transform mechanical energy into hydraulic energy and vice versa. Hydrostatic displacement units and their standard fluids based on mineral oils have been developed to a high technical standard. The fluids in this case are biologically harmful and often toxic. Fluids that are environmentally friendly (for example synthetic ester) must not include additives that are toxic. Due to the lack of additives, many environmentally friendly fluids have worse tribological properties than standard fluids. To use these fluids successfully, important tribological qualities of the fluid like wear resistance and friction reduction must be transferred to the materials. This can be achieved by new coatings. In the first part of this thesis the load occurs in the tribological contacts of axial piston pumps is calculated. In the second part the tribological properties of coatings (Physical Vapour Deposition) are investigated and compared to standard materials. We first present results concerning friction and wear from basic investigations with simplified specimen. Then coated pistons and valve plates in axial piston pumps are investigated. The results show, that especially the wear resistance of components is decisively increased by coatings. Furthermore the results from fundamental investigations show that it is also possible to reduce the friction in tribological contacts by using special coatings
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