A Study on the Surface Texture of a Cylinder for Low Friction and High Reliability

-The Effect of Cylinder Liner Texture on Piston Friction Force-

Abstract

Reducing the surface roughness of a cylinder bore is effective for reducing friction forces, but it is also known that too smooth surface sometimes causes scuffing. The test method for piston / cylinder friction in engine starting was shown in this paper. Friction force under the steady operating condition was also measured using a mono-cylinder diesel engine by means of floating liner method. The smooth surface made by electrolytic polishing showed low friction under the steady operating conditions forces but high friction peak was founded at the firing top dead center under the higher load condition in engine starting. It was assumed that the smooth cylinder had a disadvantage for scuffing under oil-starved conditions.