Design of a Lead-Free Slipper Bearing for Low Speed Axial Piston Pump Applications

Authors

  • Roman Ivantysyn Institute of Mechatronic Engineering, TU Dresden, Germany
  • Svenja Horn Institute of Mechatronic Engineering, TU Dresden, Germany
  • Jürgen Weber Institute of Mechatronic Engineering, TU Dresden, Germany

DOI:

https://doi.org/10.13052/ijfp1439-9776.2524

Keywords:

Axial piston pump, slippers, surface structures, lubricating gap, numerical simulation, tribology, lead-free material, wear, run-in

Abstract

New application areas for hydrostatic machines result in novel challenges for the fluid film performance of the lubrication interfaces. In the past hydrostatic machines were designed with a combustion engine or a constant speed electric motor in mind. Therefore, they typically have a minimal speed requirement and are optimized for a low variation in their operating speed range. Electrification and flow by demand change this requirement drastically, forcing the pumps often in both very high and very low operating speeds. Typically, lubricating gaps in positive displacement machines consist of a hard/soft material pairing, where the soft pairing usually is a yellow brass with variable lead content. The lead is added to allow for mix friction contact at low speeds and other critical conditions. New developments in surface structuring allow for precise manufacturing of the surface shaping in the sub micro-meter range. This paper combined this technology with state of the art numerical simulations to design a surface structure that is capable withstanding pump operations without significant wear and therefore allows for lead free materials – even steel/steel pairings. The different materials were tested in simulation, on a novel hydrostatic-tribometer test rig as well as on the pump test rig. The design process as well as the simulation and measurement results will be presented in this paper.

Downloads

Download data is not yet available.

Author Biographies

Roman Ivantysyn, Institute of Mechatronic Engineering, TU Dresden, Germany

Roman Ivantysyn received his bachelor’s and master’s degrees in mechanical engineering from Purdue University in 2008 and 2011, respectively. Since 2011, he has been working as a research assistant at the Chair of Fluid-Mechatronic Systems (Fluidtronics) at the Technical University of Dresden, focusing on systems and components. His research topics include open circuit displacement control in mining excavators, pump design and thermal gap analysis in axial piston pumps. He is set to submit his PhD thesis, titled “Thermal Investigation of the Lubricating Gaps of an Axial Piston Pump with Respect to Efficiency and Wear,” this year.

Svenja Horn, Institute of Mechatronic Engineering, TU Dresden, Germany

Svenja Horn received her diploma degree in aircraft construction from Technical University of Dresden in 2018. Since 2018 she is working as a research assistant at the Chair of Fluid-Mechatronic Systems on the efficiency and lifetime improvement and optimization of axial piston pumps. Her research focus on the tribological phenomena of the slipper/swashplate interface as well as the implementation of machine learning algorithms to monitor the pump’s service life.

References

R. Ivantysyn, A. Shorbagy, and J. Weber, “Investigation of the Wear Behavior of the Slipper in an Axial Piston Pump by Means of Simulation and Measurement,” in 12th IFK, 2020.

P. Achten, R. Mommers, J. Potma, and J. Achten, “Experimental Investigation of a Hydrostatic Bearing Between Barrels,” in BATH/ASME, FPMC 2020, 2020

S. Haug: “Optimization of Axial Piston Units Based on Demand-driven Relief of Tribological Contacts”, 10th IFK, Pg. 301–312, 2016.

B. Kim, Y. H. Chae, and H. S. Choi, “Effects of surface texturing on the frictional behavior of cast iron surfaces,” Tribol. Int., 2014.

A. Borghi, E. Gualtieri, D. Marchetto, L. Moretti, and S. Valeri, “Tribological effects of surface texturing on nitriding steel for high-performance engine applications”, Wear, Vol. 265, No. 7–8, 2008.

BMBF, “Funktionale Laser-Mikrostrukturierung zur Verschleiß- und Verbrauchsreduktion an hochbeanspruchten Bauteiloberflächen ‘SmartSurf,”’ 2013.

J. Baker, M. Ivantysynova: Advanced Surface Design for Reducing Power Losses in Axial Piston Machines. In: The 11th Scandinavian International Conference on Fluid Power, SICFP (2009).

G. Rizzo et al., “Axial piston pumps slippers with nanocoated surfaces to reduce friction,” International Journal of Fluid Power, Vol. 16, No. 1, 2015.

S. Scharf and H. Murrenhoff, “Wear and friction of ZRCG-coated pistons of axial piston pumps,” International Journal of Fluid Power Bd. 7 (2006), Nr. 3, S. 13–20.

G. Haidarschin, M. Hesebeck, E. Su, and M. Diesselberg, “Benchmarking of potential substituents for leaded bronze in axial sliding bearings for mobile hydraulic applications,” 11th IFK, 2018.

R. Ivantysyn, A. Shorbagy, and J. Weber, “An Approach to Visualize Lifetime Limiting Factors in the Cylinder block/Valve Plate Gap in Axial Piston Pumps,” FPMC2017-4327, 2017

M. Ivantysynova and J. Baker, “Power loss in the lubricating gap between cylinder block and valve plate of swash plate type axial piston machines,” International Journal of Fluid Power Vol. 10, No. 2, 2009.

S. Horn, R. Ivantysyn and J. Weber, “Tribo-optimized lubricating interfaces in hydrostatic pumps with surface shaped slippers”, 13th IFK, 2022.

S. Horn, R. Ivantysyn and J. Weber: “Validated efficiency improvements by implementation of structures on the slipper surface of an axial piston pump”. IEEE GFPS 2022. Naples, 2022.

S. Horn, R. Ivantysyn, T. Schmidt and J. Weber: “Tribological properties of different slipper designs of an axial piston pump”. 14th IFK, Pg. 1–18, 2024.

Downloads

Published

2024-07-30

How to Cite

Ivantysyn, R. ., Horn, S. ., & Weber, J. . (2024). Design of a Lead-Free Slipper Bearing for Low Speed Axial Piston Pump Applications. International Journal of Fluid Power, 25(02), 183–202. https://doi.org/10.13052/ijfp1439-9776.2524

Issue

Section

GFPS 2022