Piston ring for internal combustion engines with increased fatigue strength, and method for producing same
AssigneeFederal-Mogul Burscheid GmbH
InventorsNigel Gray, Stephan Machliner
Life of this patent
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Abstract
A piston ring (2) having increased fatigue resistance includes a plastically deformable material. The piston ring (2) has a running face (4), which is delimited at the top by an upper running face edge (3) and at the bottom by a lower running face edge (1). Compressive stresses are introduced into the upper running face edge (3) and/or into the lower running face edge (1) along at least one part of the circumference, the compressive stresses having been produced by roller burnishing.
Claims11
A piston ring (2) having increased fatigue
- resistance, comprising a ductile, plastically deformable material, the piston ring (2) having a running face (4), which is delimited at a top by an upper running face edge (3) and at a bottom by a lower running face edge (1), the upper running face edge (3) and/or into the lower running face edge (1) at least along a part of a circumference of the piston ring have roller burnished surfaces, and wherein compressive stresses from roller burnishing are present in the roller burnished surfaces, and wherein each running face edge (1, 3) into which the compressive stresses are introduced is also provided with a bevel or a radius of curvature between 20 and 100 μm caused by the roller burnishing.
A piston ring including an outer-most running face having at least a portion of which provided with a burnished surface finish imparting residual compressive stresses to said at least said portion.
Dependencies are inferred from the claim text.