This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Dynamic Friction in Cam/Tappet Lubrication
Annotation ability available
Sector:
Language:
English
Abstract
The valve train is an engine part which experiences severe lubrication and special effort is required to lubricate it effectively. We have investigated the role of oil composition with respect to the friction properties of a cam/tappet contact using a specially designed instrument. This tribometer determines friction during cam revolution by analysing time-dependent cam-shafttorque measurements.
The friction coefficient depends on the position of the cam relative to the tappet, as predicted by the kinematics of the system. Boundary lubrication is predominant in positions close to top lift, whereas milder lubrication conditions occur at small lift. Data on some pure mineral oils and friction-modified oils are presented.
Recommended Content
Authors
- A. K. van Helden - Koninklijke/ Shell-Laboratorium, Sheel Research B. V., Amsterdam
- R. J. van der Meer - Koninklijke/ Shell-Laboratorium, Sheel Research B. V., Amsterdam
- J. J. van Staaden - Koninklijke/ Shell-Laboratorium, Sheel Research B. V., Amsterdam
- E. van Gelderen - Koninklijke/ Shell-Laboratorium, Sheel Research B. V., Amsterdam
Topic
Citation
van Helden, A., van der Meer, R., van Staaden, J., and van Gelderen, E., "Dynamic Friction in Cam/Tappet Lubrication," SAE Technical Paper 850441, 1985, https://doi.org/10.4271/850441.Also In
References
- Colyer C.C. Harding, K.J. “The 1980’s - A Decade of Challenge for Engine Oils” SAE paper 811410
- Kovach, J.T. Tsakivis E.A. Wong, L.T. “Engine Friction Reduction for Improved Fuel Economy” SAE paper 820085
- Staron J.T. Willermet, P.A. “An Analysis of Valve Train Friction in Terms of Lubrication Principles” SAE paper 830165
- Irwin R.F. Fernandez, F. “Energy-Conserving Engine Oils - Techniques and Technology” SAE paper 830164
- Tabor, D. “Friction - The Present State of Our Understanding” J. Lubr. Technol 103 1981 169
- Okabe H. Kanno, T. “Behaviour of Polar Compounds in Lubricating Oil Films” ASLE Trans 24 1981 459 H. Okabe, M. Masuko and K. Sakurai, “Dynamic Behaviour of Surface-Adsorbed Molecules under Boundary Lubrication”. Ibid. 467.
- Papay, A.G. “Oil-Soluble Friction Reducers - Theory and Application” ASLE Trans 39 1983 419
- Dyson, A. “Kinematics and Wear Patterns of Cam and Finger/Follower Automotive Valve Gear” Tribol. Int 13 1980 121
- Dyson A. Naylor, H. “Application of the Flash Temperature Concept to Valve Gear Wear Problems” Symposium on Wear in the Gasoline Engine, Thorton Research Centre 4-5 October 1960
- Wilson J.V.D. Sainy, S.F.M. “Cam and Follower Performance Prediction of Lubricants in a Test Rig” SAE paper 770636
- Lohuis, J.R. Murphy J.A. Rogers, T.W. “The Performance of Fuel-Saving Engine Oils” SAE paper 800436