Piston ring
AssigneeFederal-Mogul Burscheid GmbH
InventorsDirk Baerenreuter, Markus Kellner
Life of this patent
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Abstract
A piston ring, and in particular a compression piston ring, has a running face, upper and lower flank regions, an inner circumferential surface and a joint, wherein at least the running face is provided with at least one wear-resistant PVD or CVD layer, wherein the PVD or CVD layer extends at a predefinable layer thickness across a circumferential length of more than 95%, but less than 100% of the piston ring, and defined circumferential sections are designed in a layer-free manner in the region of the joint.
Claims10
A piston ring comprising a running face, upper and lower flanks, an inner circumferential surface and a joint constituted of free ends of the piston ring and a space therebetween, the space extending completely through the piston ring radially and axially so that the free ends of the piston ring do not overlap one another, at least the running face being provided with at least one wear-resistant PVD or CVD layer, wherein the at least one PVD or CVD layer extends as a layer of predetermined thickness across a region constituting a circumferential length of more than 95% but less than 100% of a circumferential length of the piston ring as measured from one of the free ends to the other of the free ends of the piston ring and the only regions of the circumferential length of the piston ring to which the PVD or CVD layer does not extend are end regions of the free ends of the piston ring adjacent the space therebetween.
Dependencies are inferred from the claim text.