Patent ID: 9163726
Filing Date: 2015-10-20
Classification: F16J

Abstract:
1. A piston ring, for use in the piston channel of an internal combustion engine or a compressor, comprising at least a substantially ring-shaped metallic base ( 2 ) having a circumference, the base having at least a first region ( 20 ) extending over a first portion of the circumference of the ring, at least a second region ( 21 ) extending over a second portion of the circumference of the ring, said second portion being located adjacent the first portion along the circumference of the ring and being separate from the first portion, and at least a gap ( 22 ), the first region ( 20 ) being positioned in a manner substantially opposite to the gap ( 22 ), the ring comprising a nitrided layer ( 3 ) at least in the second region ( 21 ) and an intermediate layer ( 4 ) applied to the first region ( 20 ), the intermediate layer ( 4 ) applied to the first region ( 20 ) being configured to reduce the formation of the nitrided layer ( 3 ) in the first region ( 20 ) by at least 50% with respect to layer thickness as compared to a layer thickness of the nitrided layer ( 3 ) in the second region ( 21 ), wherein the first region ( 20 ) is a region of the base ( 2 ) substantially arranged between 140° and 220° counted from the gap ( 22 ), which is positioned at 0°, and wherein the second region encompasses the gap, wherein the first and second regions are at completely different angular regions of the base.