| 摘要 |
The present invention relates to a piston ring for use in the piston of an internal combustion engine or compressor, having a substantially annular shape defining an inner face (2) that faces the raceway, a top face (3) that faces the combustion chamber and is substantially orthogonal to the top face (2), and a bottom face (4) substantially opposite to the second face (3), a heat-insulating coating layer (P) being provided on at least part of the surface of the inner, top or bottom face (2, 3, 4). |
