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%0 Thesis %A Arnold-Hancioğullari, Daniel %T Untersuchungen zum aktiven Kolbenbolzen-Schmiersystem eines schnelllaufenden Dieselmotors unter Deformationseinfluss %I Rheinisch-Westfälische Technische Hochschule Aachen %V Dissertation %C Aachen %M RWTH-2025-09647 %P 1 Online-Ressource : Illustrationen %D 2025 %Z Veröffentlicht auf dem Publikationsserver der RWTH Aachen University %Z Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2025 %X High-speed, high-performance diesel engines are an indispensable component of mobile and stationary drives in the engine class with bore diameters up to D = 300 mm and at speeds above n = 1000 min−1. Efforts to further increase efficiency and power density lead to development targets of peak pressures up to pmax = 300 bar. Increasing mechanical loads in the crankshaft drive pose a major challenge to the design and validation of bearing concepts in large diesel engines, with the bearing of the small connecting rod eye in particular being the focus of development. Passive lubrication of existing systems is reaching the limits of the concept for the highly stressed designs, especially when taking into account the high expected service life and reliability requirements in the industrial sector. Within this work, for the first time, an existing active lubrication system on a high-speed high-performance diesel engine is investigated in detail by measurement and simulation. The methodology includes the insertion of three highly dynamic pressure sensors into the supply bore in the connecting rod, which is supplemented by two temperature measurement points in the bore, a deformation measurement of the small connecting rod eye and the metrological recording of the piston pin rotation by means of a GMR (Giant Magnetoresistance) sensor system. The signals are transmitted using a specifically designedmeasuring rocker. In addition to an evaluation of the basic behavior of the test specimen with regard to the influence of speed, load and injection timing, sensitivities to engine boundary conditions such as the gallery pressure level, the delivery volume of the piston cooling jet and the engine oil temperature are analyzed on the basis of the metrological investigations. In addition, two hardware variants, a modified inlet groove geometry and the influence of the flow cross section, are investigated at different speed and load points up to n = 1961 min−1and pmax = 220 bar. An accompanying FE (finite elements) analysis provides information on the deformation modes and the lubricant pressure distribution in the small connecting rod eye. In all measurement points, the piston pin rotation behavior shows very good reproducibility, which can mainly be attributed to the discontinuous gas and inertia force components, the acting area ratios between the contact of the piston pin in the smallconnecting rod eye and in the piston hubs, the deformation of the friction partners and the lubricant pressures in the supply bore. The hardware variations further indicate that only small absolute amounts of lubricant are delivered through the supply bore. In addition, the effect of lubricant flowing back into the connecting rod bearing is apparent and must be taken into account in the design of the system. Based on the measurement results, a 1D simulation model is built and validated against the measurement data. The simulation model extends the findings from the measured data to include the influence of geometric parameters such as the diameter and position of thesupply hole as well as the number of supply holes in the crankpin and the influence of the direction of rotation on the existing system. A targeted evaluation of the quantity of lubricant conveyed enables design guidelines to be derived for future systems. %F PUB:(DE-HGF)11 %9 Dissertation / PhD Thesis %R 10.18154/RWTH-2025-09647 %U https://publications.rwth-aachen.de/record/1021406