Study on Boundary Lubrication in the Sliding Bearing System under High Load and Speed

고하중과 고속 미끄럼 베어링 시스템의 경계윤활에 대한 연구

  • 장시열 (국민대학교 기계 자동차 공학부)
  • Published : 1999.09.01


Many tribological components in automobile engine undergo high load and sliding speed with thin film thickness. The lubrication characteristics of the components are regarded as ether hydrodynamic lubrication or boundary lubrication, whereas in a working cycle they actually have both characteristics. Many modem engine lubricants have various additives for better performance which make boundary film formation even under hydrodynamic lubrication regime. Conventional Reynolds equation with the viewpoints of continuum mechanics concerns only bulk viscosity of lubricant, which means that its simulation does not give insights on boundary lubrication characteristics. However, many additives of modern engine lubricant provide mixed modes of boundary lubrication characteristics and hydrodynamic lubrication. Especially, high molecular weight polymeric viscosity index improvers form boundary film on the solid surface and cause non-Newtonian fluid effect of shear thinning. This study has performed the investigation about journal bearing system with the mixed concepts of boundary lubrication and hydrodynamic lubrication which happen concurrently in many engine components under the condition of viscosity index improver added.



  1. Journal of Chemical Physics v.83 no.10 The Drainge of Thin Film Liquid Between Solid Surfaces Chan, D. Y. C.;Horn, R. G.
  2. Proc. Instn. Mech. Engrs, Ser. J v.209 Simulated Non-Newtonian Lubricant Behavior Under Extreme Conditions Chynoweth, S.;Coy, R. C.;Michipoulos, Y.
  3. Proc. Instn. Mech. Engrs v.210 Measurement and Modeling of Boundary Film Properties of Polymeric Lubricant Additives Guangteng, G.;Smeeth, M.;Cann, P. M.;Spikes, H. A.
  4. STLE v.33 Non-Newtonian Effects of Multigrade Oils on Journal Bearing Performance Gecim, B. A.
  5. Journal of Tribology v.117 Rheological Models for Thin Film Microconates Jang, S.;Tichy, J. A.
  6. Journal of Tribology v.117 A transient Thermody-namic Analysis Including mass Conserving Cavitation for Dynamically Loaded Journal Bearings Paranjpe, R. S.;Han, T.
  7. Journal of tribology v.114 Analysis of Non-Newtonian Effects in Dynamically Loaded Finite Journal Bearing Including Mass Conserving Cavitation Paranjpe, R. S.
  8. Engine tribology, Tribology Series v.26 Taylor, C. M.
  9. Tribology Transaction v.38 A Surface Layer Model for ThinFilm Lubrication Tichy, J. A.
  10. Intermolecular and Surface Forces, ($2^nd$ ed.) Israelachvili, J. N.
  11. New Directions in Tribology Some Surfaces Science Aspects of Tribology Georges, J.
  12. SAE SP-1209 Friction and Wear Reduction by Boundary Film Forming Viscosity Index Improvers Gunsel, S.;Smeeth, M.;Spikes, H.
  13. World Tribology Congress Friction Reduction Potential of Advanced Engine Oils in Bearings Sorab, J.;Korcek, S.
  14. Tribology Transactions v.39 The Formation of Viscous Surface Films by Polymer Soultions: Boundary or Elastohydrodynamic Lubrication Smeeth, M.;Spikes, H.;Gunsel, S
  15. SAE 942025 Predicting Viscosity-Shear Relationships of VI Improved Lubricants Chen, C. I.;Duda, L.;Wu, J.;Klaus, E.
  16. Langmir(American Chemical Society) v.7 Drainage of Compressed Polymer Layers: Dynamics of a Squeezed Sponge Fredrickson, G.;Pincus, P.
  17. American Chemical Society v.14 Polymer Solutions near Interface de Gennes, P. G.
  18. SAE 941979 Oil Activity Surface Concept on the Study of ZDDP-Basestock Type Binary Systems Hector, J.;Fransco;Cruz, R. (et al.)
  19. SAE 941102 Reconciling Empirical and Theoretical Views of Lubrication in Wet Friction Devices Anleitner, M.