Journal of Drive and Control (드라이브 ㆍ 컨트롤)

The Korean Society for Fluid Power and Construction Equipment (유공압건설기계학회)
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Investigation of the Tribological Effects of the Auxiliary Inner Ring for Piston Shoes at Low Speeds

저속에서 피스톤 슈 내부 보조 링의 윤활 효과 분석

  • Lee, S.L. (Dept. of Aerospace & Mechanical Eng., Graduate School, Korea Aerospace University) ;
  • Kim, J.H. (Dept. of Aerospace & Mechanical Eng., Graduate School, Korea Aerospace University) ;
  • Hong, Y.S. (School of Aerospace & Mechanical Eng., Korea Aerospace University) ;
  • Kim, B.K. (Yoowon Industries LTD.) ;
  • Moon, J.S. (Yoowon Industries LTD.) ;
  • Moon, J.H. (Yoowon Industries LTD.)
  • Received : 2015.05.03
  • Accepted : 2015.06.01
  • Published : 2015.06.01
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Abstract

In order to design a swash plate type pump for electro-hydrostatic actuators the performance of the hydrostatic piston shoe bearings in the low speed range needs to be examined, since the pump operates frequently at low speeds, compensating for position control errors as a control element. As a common practice, piston shoes are equipped with inner rings as an auxiliary element to enhance their tribological performance. In this paper, the effects of the inner rings of the piston shoes on the frictional loss and leakage flow rate were investigated, where three piston shoe models, with different inner ring shapes and different inlet orifice sizes, were integrated. The test results showed that a large inner ring and small inlet orifice were advantageous for reducing both the frictional loss and leakage flow rate; this could also be confirmed by computational analyses.

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References

  1. Lee, S.Y., Kim, B., Kim, S.D., Kim, G. & Hong, Y.S.., "Effect of Si doping on the wear properties of CrN coatings synthesized by unbalanced magnetron sputtering", Thin Soild Films, vol. 506-507, pp. 192-196, 2006 https://doi.org/10.1016/j.tsf.2005.08.027
  2. Hong, Y.S. & Lee, S.Y., "A comparative study of Cr-X-N(X=Zr,Si) coatings for the improvement of the low-speed torque efficiency of a hydraulic piston pump", Metals and Materials Int. Vol. 14, No. 1, pp. 33-40, 2008 https://doi.org/10.3365/met.mat.2008.02.033
  3. Murrenhoff, H., Piepenstock, U. and Torsten Kohmascher, T., "Analyzing losses in hydrostatic drives", Proc. of the 7th JFPS International Symposium on Fluid Power, pp. 103-108, 2008
  4. Hooke, C.J., Kakoullis, Y.P., " The lubrication of slippers on axial piston pumps", 5th international fluid power symposium, pp. 13-26, 1978
  5. Koc, E, Hooke, C.J., "Investigation into the effects of orifice size, offset and overclamp ratio on the lubrication of slipper bearings", Tribology International, vol. 29, No. 4, pp. 299-305, 1996 https://doi.org/10.1016/0301-679X(95)00044-5
  6. Bergada, J.M., Watton, J., Haynes, J.M., "The hydrostatic/hydrodynamic behavior of an axial piston pump slipper with multiple lands", Meccanica, vol. 45, pp. 585-602, 2010 https://doi.org/10.1007/s11012-009-9277-0
  7. Johnson, R.E., Manring, N.D., "Translating circular trust bearings", J. Fluid Mech., vol.530, pp. 197-212, 2005 https://doi.org/10.1017/S0022112005003782
  8. Schenk, A., Ivantysynova, M., "An Investigation of the impact of elastohydrodynamic deformation on power loss in the slipper swashplate interface", Proc. 8th JFPS Int. Symposium on Fluid Power, pp. 228-234, 2011
  9. Wieczorek, U., "Ein Simulationsmodell zur Beschreibung der Spaltstroemung in Axialkolbenmaschinen der Schraegscheibenbauart", Fortschritt-Berichte VDI-Verlag, Series 7, No. 443, 2003
  10. Boinghoff, O.,"Untersuchen zum Reibungsverhalten der Gleitschuhe in Schragscheiben-Axialkolbenmascinen", VDI-Forschungsheft, VDI-Verlag, vol. 584, 1977
  11. Hong, Y.S. & Kwon, Y.C., "Investigation of the power losses from hydrostatic piston shoe bearings for swash plate type axial piston pumps under mixed friction conditions", Int. J. Precision Engineering & Manufacturing, vol. 15, No. 11, pp. 2327-2333, 2014 https://doi.org/10.1007/s12541-014-0597-1
  12. Hong, Y.S., Kim, J.H. & Lee, S.L.," Performance Improvement of a swash plate type piston pump in the low-speed tange by DLC-coating", J. Korean Soc. Fluid Power Construction Equipments, vol. 11, No. 4, pp. 25-31, 2014