A mechanical test rig and a single-cylinder test engine have teen used to study the influence of lubricants, materials, and surface finish, in relation to scuffing failure of piston rings and cylinder bores. Good correlation between the mechanical rig and the engine was demonstrated when scuffing performance in the two devices was rated in terms of a factor involving contact pressure and sliding velocity. With the many features investigated, a wide range of results was obtained, and the work has thereby brought attention to various modifications which can be made in order to alleviate problems of scuffing which can occur particularly during engine “break-in”.
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References
1.
WillnJ.E.BrettP.S.“An Investigation into Piston Ring Scuffing During Running-In”, I.Mech.E. Conf. 13–14th May, 1975, Paper No. C70/75 and SAE Paper No. 750861, October 1975, 10 pp.
2.
Courtney-PrattJ.S.TudorG.K.“An Analysis of the Lubrication Between the Piston Rings and Cylinder Wall of a Running Engine”, Proc. I.Mech.E., Vol. 155, Nov 1945, p 293–299.
3.
BrooksR.L.AtkinM.L.“Observation of the Lubricating Oil Film Between Piston Ring and Cylinder of Running Engine”, Aeronautical-Res. Lab. Report No. E66, May 1950, 12 pp.
4.
CloverM.F.“Factors Affecting Piston Ring Scuffing During Running-in”, I.Mech.E. Conf. 13–14h May, 1975, Paper No. C68/75, 15 pp.
5.
NealeM.J.“Piston Ring Scuffing — A Broad Survey of Problems and Practice”, Proc. I.Mech.E., Vol 185, 2/71, p 21–32.
6.
WillnJ.E.“Survey of Engine Operating Experience Relating to the Incidence of Piston Ring and Cylinder Bore Scuffing and Correlation with Results Given by the MIRA Test Rig”, BTC/MIRA Report, October 1973, 11 pp.
7.
WillnJ.E.“A Test Rig for Investigating Piston Ring and Cylinder Bore Scuffing”, MIRA Report No. 1972/8, May 1972, 30 pp. (Also published in IP Symp., Montreux, 2–6 April, 1973).
8.
BrettP.S.“A Test Engine for Investigating Piston Ring and Cylinder Bore Scuffing”, BTCMPI Report BTC/L4/74, August 1974, 12 pp.
9.
BrettP.S.KirkwoodJ.“An Engine Performance Meter”, BTC/MIRA Report No. BTC/MIRA/L3/76, September 1976.
10.
WillnJ.E.“A Review of Surface Finish Analysis”, MIRA Bulletin No. 5, 1969, Sept/Oct, 9 pp. Re-printed in Wear, 19 (1972), p 143–162.
11.
NixonJ.“Surface Finish of Cylinder Bores”, BTC Report No. BTC/L3/74, January 1974, 54 pp.
12.
NixonJ.“An Appraisal of Replica Techniques for the Examination of the Surfaces of Cylinder Bores and Liners”, BTC/MIRA Report No. BTC/MIRA/L2/74, October 1974, 30 pp.
13.
WillnJ.E.“Factors Influencing Piston Ring and Cylinder Bore Scuffing — Experiments with a Test Rig”, BTC/MIRA Report No. BTC/MIRA/L1/74, August 1974, 46 pp.
14.
WillnJ.E.“Piston Ring and Cylinder Bore Scuffing — An Investigation of Ring and Liner Materials and Surface Treatments Conducted with a Test Rig”, BTC/MIRA Report No. BTC/MIRA/L1/75, August 1975, 59 pp.
15.
WillnJ.E.“Piston Ring and Cylinder Bore Scuffing — An Investigation of Bore Finishing Techniques”, BTC/MIRA Report No. BTC/MIRA/L2/76, May 1976, 18 pp.
16.
BrettP.S.“An Investigation of the Factors Influencing Piston Ring Scuffing Using the MIRA 700 Test Engine”, BTC/MIRA Report No. BTC/MIRA/L2/75, November 1975, 40 pp.
17.
MorrisP.J.WillnJ.E.WilliamsG.“A Comparison of the Scuffing Tendency of Lubricating Oils in Bench and Engine Tests”, IP Symp, Montreau, 2–6 April, 1973.
18.
BakerA.J.S.DowsonD.EconomuP.“Dynamic Factors Related to Piston Ring Scuffing”, I.Mech.E. Conf. 13–14th May, 1975, Paper No. C66/75, 10 pp.
19.
RyderE.A., Discussion on Paper — “The Effect of Oil Viscosity on the Power Transmitting Capacity of Spur Gears”, Trans, ASME, Vol 73, July 1951, P 694–695.
20.
HughesJ.R.WaightF.H.“The Lubrication of Spur Gears”, I.Mech.E. Proc. Int. Conf. on Gearing, 1958, Paper 29, p 135–143.
21.
BorsoffV.N.“On the Mechanism of Gear Lubrication”, Trans. ASME, Vol. 81, March 1959., P 79–93.
22.
SchneiderYu. G.LedinskiG.G.BumbaG.A.GutinM.E.“Investigation of the Wear Resistance of Cylinder Liners as a Function of Micro-Roughness of the Working Surface”, MIRA Trans. from Russian, No. 24/76.
23.
PywellR. F.PikeW. C.‘The effect of lubricants on piston ring scuffing: part I — development of an engine test’ IP Symposium, Montreux, 2–6 April 1973.
24.
DillowayC. J.SpillmanD. T.‘The effect of lubricants on piston ring scuffing: part 2 — rig studies’ IP Symposium, Montreux. 2–6 April 1973.
25.
WilliamsonJ. B. P.PullenJ.HuntR. T., ‘The shape of solid surfaces’, in ‘Surface Mechanics’ ed. by LingF. F. pp. 24–35. ASME, New York, 1969.
26.
ThomasT. R., ‘The characterization of changes in surface topography during running-in’, Proc. 4th. Leeds-Lyon Symp., MEP, in press.
27.
EberleO. A., ‘Graphical method for statistical assessment of surface roughness comparison specimens’, Proc. Instn. Mech. Engrs., 1967/68182, Part 3K, 368–396.
