Piston ring and internal combustion engine

A piston ring for an internal combustion engine, comprising:

• an annular base body having a central longitudinal axis extending along an axial direction, the base body extending circumferentially about the central longitudinal axis along a circumferential direction of the base body perpendicular to the axial direction;
• and
• a protective coating arranged on an outer circumference of the base body;
• wherein the base body includes:
• a first joint flank;
• a second joint flank;
• an interruption along the circumferential direction forming a joint bounded along the circumferential direction via the first joint flank and the second joint flank;
• an axial end face including a radially outer surface section extending perpendicularly to the central longitudinal axis and merging radially inwards along a radial direction of the base body into a radially inner surface section extending at an obtuse angle to the central longitudinal axis, an extension of the radially outer surface section measured along the radial direction being 0.3 mm or less;
• and
• an edge formed between the first joint flank and the axial end face, the edge including a chamfer having:
• i) an axial extent measured along the axial direction of 0.16mm or less and ii) an extent measured along the circumferential direction of 0.16 mm.