Investigation of effects of surface roughness on the performance of cam mechanisms

Year 2021, Volume: 10 Issue: 1, 67 - 73, 31.03.2021

Hasan Baş

https://doi.org/10.18245/ijaet.843229

Cited By: 2

Abstract

The surface roughness of two contacting surfaces significantly influences the tribological performance of the mechanical elements. Their impression is more pronounced under the mixed elasto-hydrodynamic lubrication condition. The cam and flat follower mechanism is a typical sample in which adverse tribological conditions, including direct boundary interactions occurs. In this study, effects of surface roughness on the friction force and friction coefficient are investigated using engine oil at different test conditions in a cam follower mechanism. It is seen that decreasing roughness of the contact surfaces has a more desirable tribological performance, and decrease friction coefficient, therefore increase wear resistance.

Keywords

Surface Roughness, Oil Film, Friction Coefficient, Combustion Engine Oil

Project Number

2008.112.003.9

References

• [1] A. Torabi, S. Akbarzadeh, M. R. Salimpour and M. Taei, “Effect of surface roughness pattern on transient mixed elastohydrodynamic lubrication” Surface Topography: Metrology and Properties, Volume 4, Number 1, 2015
• [2] N. Patir, H.S. Cheng, “An average flow model for determining effects of three-dimensional roughness in partial hydrodynamic lubrication” J. Lubr. Technol., Trans. ASME 100 1 1978 12–17.
• [3] D. Dowson, C.M. Taylor, G. Zhu, Mixed lubrication of a cam and flat faced follower, Proc. 13th Leeds–Lyon Symposium on Tribology — Fluid Film Lubrication, Tribol. Ser. vol. 11 Elsevier, Amsterdam, 1987, pp. 599–609.
• [4] L.S. Yang, A. Ibo, H. Negishi, A valve train friction and lubrication analysis model and its application in a camrtappet wear study, SAE Technical Paper 962030, 1996, 9 pp.
• [5] [5] M. Priest, C.M. Taylor “Automobile engine tribology — approaching the surface” Wear 241 2000 193–203.
• [6] P. Ehret, D. Dowson, C.M. Taylor, Time-dependent solutions with waviness and asperities in EHL point contacts, Proc. 23rd Leeds– Lyon Symposium on Tribology — Elastohydrodynamics ’96, Tribol. Ser. vol. 32 Elsevier, Amsterdam, 1997, pp. 313–324.
• [7] R.F. O’Connor, T.A. Spedding, Investigation into the effects of waviness present on the cam surface profile of an engine camshaft, Precis. Eng. 11 2 1989 83–88, Butterworth.
• [8] I. Tanimoto, M. Kano, M. Sasaki, Establishment of a method for predicting cam follower wear in the material development process, SAE Technical Paper 902087, 1990, 8 pp.
• [9] Zhu D and Wang Q J 2013 Effect of roughness orientation on the elastohydrodynamic lubrication film thickness ASME J. Tribol. 135 031501
• [10] H. Bas, Ph.D. Thesis, ‘‘Investigation of Friction Behavior of Additive Engine Oils on Cam Mechanisms,’’ (in Turkish) Karadeniz Technical University Institute of Natural and Applied Sciences, 2001.
• [11] H. Bas, A. Bıyıklıoglu, ‘‘Investigation of Frictional Behavior of Different Kinds of Engine Oils on Cam Mechanisms Used in Automotive Engines,’’ International Conference on Lubrication Techniques, Istanbul, 87–103, ICOLT’99.
• [12] H. Bas, A. Bıyıklıoglu and H. Cuvalci, “A New Test Apparatus For the Tribological Behavior Of Cam Mechanisms,” Experimental Techniques, 2003.