Federal-mogul Burscheid Gmbh

Frank Münchow

Johannes Esser

Manfred Fischer

A piston ring, with a main body, which exhibits a contact surface, an upper and a lower side surface, and an inner circumferential surface, in which at least one of the side surfaces is provided at least with one PVD coating layer, to the effect that the layer thickness of the PVD coating layer tapers radially from the outside inward.

Piston ring

The invention relates to a piston ring, having a base body, which comprises a running surface provided with a chamber, an upper and a lower flank surface, and an inner circumferential surface, wherein at least the chamber is provided with at least one wear protection layer, and a PVD cover layer is applied to the running surface at least in some regions such that the base body has the PVD cover layer only in the edge regions, which is to say outside of the chamber, in the finished state.

A piston ring for an internal combustion engine is made of steel and has an outer contact surface that is nitrated and coated to no more than 70 &#x3bc;m with a protective coating comprising nitrides of aluminum and/or silicium and/or zirconium in a matrix of chromium-nitride based material.

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Wermelskirchen, Germany

Frank Münchow