Cylinder unit and method for forming the sliding surfaces thereof

摘要

A cylinder unit for an internal combustion engine, comprising a cylinder having a cylinder bore. A crankshaft is connected to a piston fitted into the cylinder bore in the axial direction, so as to freely slide upon the sliding area of the inside circumferential surface thereof. This surface is provided with a plating layer the thickness of which diminishes gradually at the end area of said plating layer adjacent to the crankshaft towards an unplated area.