Advertisement

KSME International Journal

, Volume 16, Issue 4, pp 468–475 | Cite as

Friction characteristics of piston ring pack with consideration of mixed lubrication: Parametric investigation

  • Kim Ji-Young
  • Kim Jee-Woon
  • Cho Myung-Rae
  • Han Dong-Chul
Materials & Fracture · Solids & Structures · Dynamics & Control · Production & Design

Abstract

This paper reports on the friction characteristics of a piston ring pack with consideration of mixed lubrication. The analytical model is presented by using the average flow and asperity contact model. The effect of operating condition, and design parameters on the MOFT, maximum friction force, and mean frictional power loss are investigated. Piston ring pack shows mixed and hydrodynamic lubrication characteristics. From the predicted results, it was fand that the ring tension and height of surface roughness have great influence on the frictional power losses in a ring pack. Especially, ring tension is a dominant factor for the reduction of friction loss and maintenance of oil film thickness.

Key words

Mixed Lubrication Piston Ring Pack Asperity Contact Minimum Oil Film Thickness Surface Roughness Power Loss Tension 

Nomenclature

Aac

Real contact area per unit area

Ac

Real contact area

b

Ring width

E

Young’s Modulus

Fb

Boundary friction force

Fc

Asperity contact force

Foil

Radial force of oil film

Ftotal

Total friction force

Fv

Viscous friction force

h

Nominal film thickness

hm

Nominal minimum oil film thickness

ht

Local oil film thickness

\(\overline h _t \)

Average gap

p

Film Pressure

pb

Back pressure

pc

Asperity contact pressure

pTE

Elastic pressure of ring

R

Ring radius

rc

Crank radius

t

Time

U

Sliding speed

Vr1,Vr2

Variance ratio of parameter

α

Rate of the film shear strength with pressure

β

Asperity radius of curvature

δ

Composite roughness amplitude

γ

Roughness pattern parameter

η

Oil viscosity

μ

Asperity density

σ

Composite rms roughness

τ0

Shear strength constant

τv

Hydrodynamic component of shear stress

ω

Rotational speed

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Dowson, D., Economou, P. N., Euddy, B. L., Strachan, P. J. and Baker, A. J. S., 1979, “Piston Ring Lubrication—Part II. Theoretical Analysis of a Single Ring and a Complete Ring Pack, Energy Conservation Through Fluid Film Lubrication Technology: Frontiers in Research and Design,”Winter Annual Meeting of ASME, pp. 23–52.Google Scholar
  2. Greenwood, J. A. and Tripp, J. H., 1971, “The Contact of Two Nominally Flat Rough Surface,”Proc. Instn. Mech. Engrs., 185, 48/71.Google Scholar
  3. Hamatake, T., Wakuri, Y., Soejima, M., Kitahara, T. and Matusi, K., 1995, “Mixed Lubrication of an Oil-Control Ring in a Piston Engine,”Proc. Int. Trib. Conf., Yokohama, pp. 1429–1434.Google Scholar
  4. Lloyd, T., 1968, “The Hydrodynamic Lubrication of Piston Ring,”Proc. Inst. Mech. Engrs., 183, Part 3P, pp. 28–34.Google Scholar
  5. Patir, N. and Cheng, H. S., 1978, “An Average Flow Model for Determining Effects of Three-Dimensional Roughness on Partial Hydrodynamic Lubrication,”ASME Journal of Lubrication Technology, 100, 1, pp. 12–17.Google Scholar
  6. Patir, N. and Cheng, H. S., 1979, “Application of Average Flow Model to Lubrication Between Rough Sliding Surface,”ASME Journal of Lubrication Technology, 121, 2, pp. 220–230.Google Scholar
  7. Hu, Y., Cheng, H. S., Arai, T., Kobayashi, Y. and Aoyama, S., 1994, “Numerical Simulation of Piston Ring in Mixed Lubrication—A Nonaxisymmetrical Analysis,”ASME Journal of Tribology, 116, pp. 470–478.CrossRefGoogle Scholar
  8. Rohde, S. M., 1980, “A Mixed Friction Model For Dynamically Loaded Contacts with Application to Piston Ring Lubrication,”Proc. the 7th Leeds-Lyon Symp. on Tribology, Butterworths, pp. 262–278.Google Scholar
  9. Ting, L. L. and Mayer, J. E., 1974, “Piston Ring Lubrication and Cylinder Bore Wear Analysis, Part I—Theory,”ASME Journal of Lubrication Technology, 96, pp. 305–314.Google Scholar
  10. Wakuri, Y., Hamatake, T., Soejima, M. and Kitahara, T., 1995, “Study on the Mixed Lubrication of Piston Rings in Internal Combustion Engine,”JSME, 61, 538, Part C, pp. 1123–1128.Google Scholar
  11. Yun, J. E., Chung, Y., Chun, S. M. and Lee, K. Y., 1995, “An Application of Simplified Average Reynolds Equation for Mixed Lubrication Analysis of Piston Ring Assembly in an Internal Combustion Engine,” SAE952562, pp. 209–216.Google Scholar

Copyright information

© The Korean Society of Mechanical Engineers (KSME) 2002

Authors and Affiliations

  • Kim Ji-Young
    • 1
  • Kim Jee-Woon
    • 1
  • Cho Myung-Rae
    • 2
  • Han Dong-Chul
    • 1
  1. 1.Graduate Student, Seoul National UniversitySeoulKorea
  2. 2.Power Train R&D CenterHyundai Motor Co.Korea

Personalised recommendations