Experimental and simulative investigation of the cylinder block/valve plate contact in axial piston machines

  • Experimentelle und simulative Untersuchung des Kolbentrommel/Steuerspiegelkontaktes in Axialkolbenmaschinen

Wegner, Stephan; Murrenhoff, Hubertus (Thesis advisor); Schmitz, Katharina (Thesis advisor)

Düren : Shaker Verlag (2021)
Book, Dissertation / PhD Thesis

In: Reihe Fluidtechnik. D 108
Page(s)/Article-Nr.: 1 Online-Ressource : Illustrationen, Diagramme

Dissertation, RWTH Aachen University, 2020

Abstract

Axial piston machines are widely used energy conversion machines in hydraulic applications. They are the interface between mechanical energy (speed and torque) and hydraulic energy (pressure and volume flow), often used in applications with a high-power demand. Stationary applications (e.g., presses or entire lumber mills) as well as mobile applications (e.g., work and traction hydraulic systems) use axial piston machines. Within these machines, relative movement between the components create boundary conditions for the design, material selection and environment, etc. One of the interfaces is the cylinder block/valve plate contact, that combines several functions (simplified a ring-shaped contact with relative rotational movement). This thesis describes analytical calculations, experimental investigations, and simulations of a modified 140 cm³ pump, focusing on the cylinder block/valve plate contact. A comparison of the approaches and the description of influencing factors is concluded by a discussion of the results and deviations from the expected results. The measurement of the gap height within the magnitude of micrometers in combination with the cylinder block shift and the friction torque measurement in different operating points shows potential hot-spots and locations of increased wear within the contact. The simulative modeling allows for an understanding of the influencing factors, their modification and potential optimization. With the results of this thesis, dedicated actions for a focused optimization regarding friction and material selection can be defined.

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